ECS and cleanup body system, merge body templates and presets into body prototypes (#11991)

Co-authored-by: Jezithyr <Jezithyr@gmail.com>

Content.Client/Body/Components/BodyComponent.cs

@@ -1,21 +0,0 @@
-using Content.Shared.Body.Components;
-using Content.Shared.DragDrop;
-using Robust.Shared.GameObjects;
-
-namespace Content.Client.Body.Components
-{
-    [RegisterComponent]
-    [ComponentReference(typeof(SharedBodyComponent))]
-    public sealed class BodyComponent : SharedBodyComponent, IDraggable
-    {
-        bool IDraggable.CanStartDrag(StartDragDropEvent args)
-        {
-            return true;
-        }
-
-        bool IDraggable.CanDrop(CanDropEvent args)
-        {
-            return true;
-        }
-    }
-}

Content.Client/Body/Components/BodyPartComponent.cs

@@ -1,11 +0,0 @@
-using Content.Shared.Body.Components;
-using Robust.Shared.GameObjects;
-
-namespace Content.Client.Body.Components
-{
-    [RegisterComponent]
-    [ComponentReference(typeof(SharedBodyPartComponent))]
-    public sealed class BodyPartComponent : SharedBodyPartComponent
-    {
-    }
-}

Content.Client/Body/Systems/BodySystem.cs

@@ -0,0 +1,7 @@
+using Content.Shared.Body.Systems;
+
+namespace Content.Client.Body.Systems;
+
+public sealed class BodySystem : SharedBodySystem
+{
+}

Content.Client/Body/UI/BodyScannerDisplay.cs

@@ -1,11 +1,10 @@
 using System.Linq;
 using Content.Shared.Body.Components;
+using Content.Shared.Body.Part;
+using Content.Shared.Body.Systems;
 using Content.Shared.Damage;
 using Robust.Client.UserInterface.Controls;
 using Robust.Client.UserInterface.CustomControls;
-using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
-using Robust.Shared.Localization;
 using static Robust.Client.UserInterface.Controls.BoxContainer;
 using static Robust.Client.UserInterface.Controls.ItemList;
 
@@ -14,7 +13,8 @@ namespace Content.Client.Body.UI
     public sealed class BodyScannerDisplay : DefaultWindow
     {
         private EntityUid? _currentEntity;
-        private SharedBodyPartComponent? _currentBodyPart;
+        private BodyPartComponent? _currentBodyPart;
+        private readonly Dictionary<int, BodyPartSlot> _bodyPartsList = new();
 
         public BodyScannerDisplay(BodyScannerBoundUserInterface owner)
         {
@@ -106,75 +106,79 @@ namespace Content.Client.Body.UI
         {
             _currentEntity = entity;
             BodyPartList.Clear();
+            _bodyPartsList.Clear();
 
-            var body = IoCManager.Resolve<IEntityManager>().GetComponentOrNull<SharedBodyComponent>(_currentEntity);
-
-            if (body == null)
+            var bodySystem = IoCManager.Resolve<IEntitySystemManager>().GetEntitySystem<SharedBodySystem>();
+            var i = 0;
+            foreach (var part in bodySystem.GetBodyChildren(_currentEntity))
             {
-                return;
-            }
-
-            foreach (var (part, _) in body.Parts)
-            {
-                BodyPartList.AddItem(Loc.GetString(part.Name));
+                _bodyPartsList[i++] = part.Component.ParentSlot!;
+                BodyPartList.AddItem(Loc.GetString(part.Component.Name));
             }
         }
 
         public void BodyPartOnItemSelected(ItemListSelectedEventArgs args)
         {
-            if (!IoCManager.Resolve<IEntityManager>().TryGetComponent<SharedBodyComponent>(_currentEntity, out var body))
-            {
-                return;
-            }
+            var entMan = IoCManager.Resolve<IEntityManager>();
 
-            var slot = body.SlotAt(args.ItemIndex);
-            _currentBodyPart = body.PartAt(args.ItemIndex).Key;
+            _currentBodyPart = entMan.GetComponentOrNull<BodyPartComponent>(_bodyPartsList[args.ItemIndex].Child);
 
-            if (slot.Part != null)
+            if (_currentBodyPart is {ParentSlot.Id: var slotId} part)
             {
-                UpdateBodyPartBox(slot.Part, slot.Id);
+                UpdateBodyPartBox(part, slotId);
             }
         }
 
-        private void UpdateBodyPartBox(SharedBodyPartComponent part, string slotName)
+        private void UpdateBodyPartBox(BodyPartComponent part, string slotName)
         {
             var entMan = IoCManager.Resolve<IEntityManager>();
-            BodyPartLabel.Text = $"{Loc.GetString(slotName)}: {Loc.GetString(entMan.GetComponent<MetaDataComponent>(part.Owner).EntityName)}";
+            BodyPartLabel.Text =
+                $"{Loc.GetString(slotName)}: {Loc.GetString(entMan.GetComponent<MetaDataComponent>(part.Owner).EntityName)}";
 
             // TODO BODY Part damage
             if (entMan.TryGetComponent(part.Owner, out DamageableComponent? damageable))
             {
-                BodyPartHealth.Text = Loc.GetString("body-scanner-display-body-part-damage-text",("damage", damageable.TotalDamage));
+                BodyPartHealth.Text = Loc.GetString("body-scanner-display-body-part-damage-text",
+                    ("damage", damageable.TotalDamage));
             }
 
             MechanismList.Clear();
 
-            foreach (var mechanism in part.Mechanisms)
+            var bodySystem = entMan.System<SharedBodySystem>();
+            foreach (var organ in bodySystem.GetPartOrgans(part.Owner, part))
             {
-                MechanismList.AddItem(mechanism.Name);
+                var organName = entMan.GetComponent<MetaDataComponent>(organ.Id).EntityName;
+                MechanismList.AddItem(organName);
             }
         }
 
         // TODO BODY Guaranteed this is going to crash when a part's mechanisms change. This part is left as an exercise for the reader.
         public void MechanismOnItemSelected(ItemListSelectedEventArgs args)
         {
-            UpdateMechanismBox(_currentBodyPart?.Mechanisms.ElementAt(args.ItemIndex));
+            if (_currentBodyPart == null)
+            {
+                UpdateMechanismBox(null);
+                return;
+            }
+
+            var bodySystem = IoCManager.Resolve<IEntityManager>().System<SharedBodySystem>();
+            var organ = bodySystem.GetPartOrgans(_currentBodyPart.Owner, _currentBodyPart).ElementAt(args.ItemIndex);
+            UpdateMechanismBox(organ.Id);
         }
 
-        private void UpdateMechanismBox(MechanismComponent? mechanism)
+        private void UpdateMechanismBox(EntityUid? organ)
         {
             // TODO BODY Improve UI
-            if (mechanism == null)
+            if (organ == null)
             {
                 MechanismInfoLabel.SetMessage("");
                 return;
             }
 
             // TODO BODY Mechanism description
-            var message =
-                Loc.GetString(
-                    $"{mechanism.Name}\nHealth: {mechanism.CurrentDurability}/{mechanism.MaxDurability}");
-
+            var entMan = IoCManager.Resolve<IEntityManager>();
+            var organName = entMan.GetComponent<MetaDataComponent>(organ.Value).EntityName;
+            var message = Loc.GetString($"{organName}");
             MechanismInfoLabel.SetMessage(message);
         }
     }

Content.Client/Commands/HideMechanismsCommand.cs

@@ -1,10 +1,8 @@
-using Content.Shared.Body.Components;
+using Content.Shared.Body.Organ;
 using Robust.Client.Console;
 using Robust.Client.GameObjects;
 using Robust.Shared.Console;
 using Robust.Shared.Containers;
-using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
 
 namespace Content.Client.Commands
 {
@@ -17,18 +15,18 @@ namespace Content.Client.Commands
         public void Execute(IConsoleShell shell, string argStr, string[] args)
         {
             var entityManager = IoCManager.Resolve<IEntityManager>();
-            var mechanisms = entityManager.EntityQuery<MechanismComponent>(true);
+            var organs = entityManager.EntityQuery<OrganComponent>(true);
 
-            foreach (var mechanism in mechanisms)
+            foreach (var part in organs)
             {
-                if (!entityManager.TryGetComponent(mechanism.Owner, out SpriteComponent? sprite))
+                if (!entityManager.TryGetComponent(part.Owner, out SpriteComponent? sprite))
                 {
                     continue;
                 }
 
                 sprite.ContainerOccluded = false;
 
-                var tempParent = mechanism.Owner;
+                var tempParent = part.Owner;
                 while (tempParent.TryGetContainer(out var container))
                 {
                     if (!container.ShowContents)

Content.Client/Commands/ShowMechanismsCommand.cs

@@ -1,9 +1,7 @@
-using Content.Shared.Body.Components;
+using Content.Shared.Body.Organ;
 using Robust.Client.Console;
 using Robust.Client.GameObjects;
 using Robust.Shared.Console;
-using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
 
 namespace Content.Client.Commands
 {
@@ -19,9 +17,9 @@ namespace Content.Client.Commands
         public void Execute(IConsoleShell shell, string argStr, string[] args)
         {
             var entityManager = IoCManager.Resolve<IEntityManager>();
-            var mechanisms = entityManager.EntityQuery<MechanismComponent>(true);
+            var organs = entityManager.EntityQuery<OrganComponent>(true);
 
-            foreach (var mechanism in mechanisms)
+            foreach (var mechanism in organs)
             {
                 if (entityManager.TryGetComponent(mechanism.Owner, out SpriteComponent? sprite))
                 {

Content.IntegrationTests/Tests/Body/LegTest.cs

@@ -1,5 +1,5 @@
 using System.Threading.Tasks;
-using Content.Server.Body.Components;
+using Content.Server.Body.Systems;
 using Content.Shared.Body.Components;
 using Content.Shared.Body.Part;
 using Content.Shared.Rotation;
@@ -12,7 +12,7 @@ using Robust.Shared.Maths;
 namespace Content.IntegrationTests.Tests.Body
 {
     [TestFixture]
-    [TestOf(typeof(SharedBodyComponent))]
+    [TestOf(typeof(BodyPartComponent))]
     [TestOf(typeof(BodyComponent))]
     public sealed class LegTest
     {
@@ -23,16 +23,15 @@ namespace Content.IntegrationTests.Tests.Body
   components:
   - type: Appearance
   - type: Body
-    template: HumanoidTemplate
-    preset: HumanPreset
-    centerSlot: torso
+    prototype: Human
   - type: StandingState
 ";
 
         [Test]
         public async Task RemoveLegsFallTest()
         {
-            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings{NoClient = true, ExtraPrototypes = Prototypes});
+            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings
+                {NoClient = true, ExtraPrototypes = Prototypes});
             var server = pairTracker.Pair.Server;
 
             AppearanceComponent appearance = null;
@@ -44,18 +43,20 @@ namespace Content.IntegrationTests.Tests.Body
                 var mapId = mapManager.CreateMap();
 
                 var entityManager = IoCManager.Resolve<IEntityManager>();
-                var human = entityManager.SpawnEntity("HumanBodyAndAppearanceDummy", new MapCoordinates(Vector2.Zero, mapId));
+                var human = entityManager.SpawnEntity("HumanBodyAndAppearanceDummy",
+                    new MapCoordinates(Vector2.Zero, mapId));
 
-                Assert.That(entityManager.TryGetComponent(human, out SharedBodyComponent body));
+                Assert.That(entityManager.TryGetComponent(human, out BodyComponent body));
                 Assert.That(entityManager.TryGetComponent(human, out appearance));
 
                 Assert.That(!appearance.TryGetData(RotationVisuals.RotationState, out RotationState _));
 
-                var legs = body.GetPartsOfType(BodyPartType.Leg);
+                var bodySystem = entityManager.System<BodySystem>();
+                var legs = bodySystem.GetBodyChildrenOfType(body.Owner, BodyPartType.Leg, body);
 
                 foreach (var leg in legs)
                 {
-                    body.RemovePart(leg);
+                    bodySystem.DropPart(leg.Id, leg.Component);
                 }
             });
 

Content.IntegrationTests/Tests/Body/LungTest.cs

@@ -22,9 +22,7 @@ namespace Content.IntegrationTests.Tests.Body
   components:
   - type: SolutionContainerManager
   - type: Body
-    template: HumanoidTemplate
-    preset: HumanPreset
-    centerSlot: torso
+    prototype: Human
   - type: MobState
     thresholds:
       0: Alive
@@ -49,7 +47,8 @@ namespace Content.IntegrationTests.Tests.Body
         public async Task AirConsistencyTest()
         {
             // --- Setup
-            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings{NoClient = true, ExtraPrototypes = Prototypes});
+            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings
+                {NoClient = true, ExtraPrototypes = Prototypes});
             var server = pairTracker.Pair.Server;
 
             await server.WaitIdleAsync();
@@ -62,7 +61,7 @@ namespace Content.IntegrationTests.Tests.Body
 
             MapId mapId;
             EntityUid? grid = null;
-            SharedBodyComponent body = default;
+            BodyComponent body = default;
             EntityUid human = default;
             GridAtmosphereComponent relevantAtmos = default;
             float startingMoles = 0.0f;
@@ -127,7 +126,8 @@ namespace Content.IntegrationTests.Tests.Body
         [Test]
         public async Task NoSuffocationTest()
         {
-            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings{NoClient = true, ExtraPrototypes = Prototypes});
+            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings
+                {NoClient = true, ExtraPrototypes = Prototypes});
             var server = pairTracker.Pair.Server;
 
             var mapLoader = server.ResolveDependency<IMapLoader>();
@@ -155,7 +155,7 @@ namespace Content.IntegrationTests.Tests.Body
                 var coordinates = new EntityCoordinates(grid.Value, center);
                 human = entityManager.SpawnEntity("HumanBodyDummy", coordinates);
 
-                Assert.True(entityManager.HasComponent<SharedBodyComponent>(human));
+                Assert.True(entityManager.HasComponent<BodyComponent>(human));
                 Assert.True(entityManager.TryGetComponent(human, out respirator));
                 Assert.False(respirator.SuffocationCycles > respirator.SuffocationCycleThreshold);
             });
@@ -167,7 +167,8 @@ namespace Content.IntegrationTests.Tests.Body
                 await server.WaitRunTicks(increment);
                 await server.WaitAssertion(() =>
                 {
-                    Assert.False(respirator.SuffocationCycles > respirator.SuffocationCycleThreshold, $"Entity {entityManager.GetComponent<MetaDataComponent>(human).EntityName} is suffocating on tick {tick}");
+                    Assert.False(respirator.SuffocationCycles > respirator.SuffocationCycleThreshold,
+                        $"Entity {entityManager.GetComponent<MetaDataComponent>(human).EntityName} is suffocating on tick {tick}");
                 });
             }
 

Content.IntegrationTests/Tests/Body/SaveLoadReparentTest.cs

@@ -0,0 +1,148 @@
+using System.Linq;
+using System.Threading.Tasks;
+using Content.Shared.Body.Components;
+using Content.Shared.Body.Systems;
+using NUnit.Framework;
+using Robust.Server.Maps;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map;
+
+namespace Content.IntegrationTests.Tests.Body;
+
+[TestFixture]
+public sealed class SaveLoadReparentTest
+{
+    private const string Prototypes = @"
+- type: entity
+  name: HumanBodyDummy
+  id: HumanBodyDummy
+  components:
+  - type: Body
+    prototype: Human
+";
+
+    [Test]
+    public async Task Test()
+    {
+        await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings
+        {
+            NoClient = true,
+            ExtraPrototypes = Prototypes
+        });
+        var server = pairTracker.Pair.Server;
+
+        var entities = server.ResolveDependency<IEntityManager>();
+        var maps = server.ResolveDependency<IMapManager>();
+        var mapLoader = server.ResolveDependency<IMapLoader>();
+        var bodySystem = entities.System<SharedBodySystem>();
+
+        await server.WaitAssertion(() =>
+        {
+            var mapId = maps.CreateMap();
+            maps.CreateGrid(mapId);
+            var human = entities.SpawnEntity("HumanBodyDummy", new MapCoordinates(0, 0, mapId));
+
+            Assert.That(entities.HasComponent<BodyComponent>(human), Is.True);
+
+            var parts = bodySystem.GetBodyChildren(human).ToArray();
+            var organs = bodySystem.GetBodyOrgans(human).ToArray();
+
+            Assert.Multiple(() =>
+            {
+                Assert.That(parts, Is.Not.Empty);
+                Assert.That(organs, Is.Not.Empty);
+            });
+
+            foreach (var (id, component) in parts)
+            {
+                Assert.Multiple(() =>
+                {
+                    Assert.That(component.Body, Is.EqualTo(human));
+                    Assert.That(component.ParentSlot, Is.Not.Null);
+                    Assert.That(component.ParentSlot.Parent, Is.Not.EqualTo(default(EntityUid)));
+                    Assert.That(component.ParentSlot.Child, Is.EqualTo(id));
+                });
+
+                foreach (var (slotId, slot) in component.Children)
+                {
+                    Assert.Multiple(() =>
+                    {
+                        Assert.That(slot.Id, Is.EqualTo(slotId));
+                        Assert.That(slot.Parent, Is.Not.EqualTo(default(EntityUid)));
+                    });
+                }
+            }
+
+            foreach (var (id, component) in organs)
+            {
+                Assert.Multiple(() =>
+                {
+                    Assert.That(component.Body, Is.EqualTo(human));
+                    Assert.That(component.ParentSlot, Is.Not.Null);
+                    Assert.That(component.ParentSlot.Parent, Is.Not.EqualTo(default(EntityUid)));
+                    Assert.That(component.ParentSlot.Child, Is.EqualTo(id));
+                });
+            }
+
+            Assert.That(entities
+                .EntityQuery<BodyComponent>()
+                .Where(e => entities.GetComponent<MetaDataComponent>(e.Owner).EntityPrototype!.Name ==
+                            "HumanBodyDummy"), Is.Not.Empty);
+
+            const string mapPath = $"/{nameof(SaveLoadReparentTest)}{nameof(Test)}map.yml";
+
+            mapLoader.SaveMap(mapId, mapPath);
+            maps.DeleteMap(mapId);
+
+            mapId = maps.CreateMap();
+            mapLoader.LoadMap(mapId, mapPath);
+
+            var query = entities
+                .EntityQuery<BodyComponent>()
+                .Where(e => entities.GetComponent<MetaDataComponent>(e.Owner).EntityPrototype!.Name == "HumanBodyDummy")
+                .ToArray();
+
+            Assert.That(query, Is.Not.Empty);
+            foreach (var body in query)
+            {
+                human = body.Owner;
+                parts = bodySystem.GetBodyChildren(human).ToArray();
+                organs = bodySystem.GetBodyOrgans(human).ToArray();
+
+                Assert.That(parts, Is.Not.Empty);
+                Assert.That(organs, Is.Not.Empty);
+
+                foreach (var (id, component) in parts)
+                {
+                    Assert.Multiple(() =>
+                    {
+                        Assert.That(component.Body, Is.EqualTo(human));
+                        Assert.That(component.ParentSlot, Is.Not.Null);
+                        Assert.That(component.ParentSlot.Parent, Is.Not.EqualTo(default(EntityUid)));
+                        Assert.That(component.ParentSlot.Child, Is.EqualTo(id));
+                    });
+
+                    foreach (var (slotId, slot) in component.Children)
+                    {
+                        Assert.Multiple(() =>
+                        {
+                            Assert.That(slot.Id, Is.EqualTo(slotId));
+                            Assert.That(slot.Parent, Is.Not.EqualTo(default(EntityUid)));
+                        });
+                    }
+                }
+
+                foreach (var (id, component) in organs)
+                {
+                    Assert.Multiple(() =>
+                    {
+                        Assert.That(component.Body, Is.EqualTo(human));
+                        Assert.That(component.ParentSlot, Is.Not.Null);
+                        Assert.That(component.ParentSlot.Parent, Is.Not.EqualTo(default(EntityUid)));
+                        Assert.That(component.ParentSlot.Child, Is.EqualTo(id));
+                    });
+                }
+            }
+        });
+    }
+}

Content.IntegrationTests/Tests/Buckle/BuckleTest.cs

@@ -1,4 +1,5 @@
 using System.Threading.Tasks;
+using Content.Server.Body.Systems;
 using Content.Server.Buckle.Components;
 using Content.Server.Hands.Components;
 using Content.Shared.ActionBlocker;
@@ -9,8 +10,6 @@ using Content.Shared.Hands.EntitySystems;
 using Content.Shared.Standing;
 using NUnit.Framework;
 using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
-using Robust.Shared.Map;
 
 namespace Content.IntegrationTests.Tests.Buckle
 {
@@ -31,9 +30,7 @@ namespace Content.IntegrationTests.Tests.Buckle
   - type: Buckle
   - type: Hands
   - type: Body
-    template: HumanoidTemplate
-    preset: HumanPreset
-    centerSlot: torso
+    prototype: Human
   - type: StandingState
 
 - type: entity
@@ -48,10 +45,12 @@ namespace Content.IntegrationTests.Tests.Buckle
   components:
   - type: Item
 ";
+
         [Test]
         public async Task BuckleUnbuckleCooldownRangeTest()
         {
-            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings{ExtraPrototypes = Prototypes});
+            await using var pairTracker =
+                await PoolManager.GetServerClient(new PoolSettings {ExtraPrototypes = Prototypes});
             var server = pairTracker.Pair.Server;
 
             var testMap = await PoolManager.CreateTestMap(pairTracker);
@@ -96,7 +95,10 @@ namespace Content.IntegrationTests.Tests.Buckle
                 Assert.False(actionBlocker.CanMove(human));
                 Assert.False(actionBlocker.CanChangeDirection(human));
                 Assert.False(standingState.Down(human));
-                Assert.That((entityManager.GetComponent<TransformComponent>(human).WorldPosition - entityManager.GetComponent<TransformComponent>(chair).WorldPosition).Length, Is.LessThanOrEqualTo(buckle.BuckleOffset.Length));
+                Assert.That(
+                    (entityManager.GetComponent<TransformComponent>(human).WorldPosition -
+                     entityManager.GetComponent<TransformComponent>(chair).WorldPosition).Length,
+                    Is.LessThanOrEqualTo(buckle.BuckleOffset.Length));
 
                 // Side effects of buckling for the strap
                 Assert.That(strap.BuckledEntities, Does.Contain(human));
@@ -166,7 +168,8 @@ namespace Content.IntegrationTests.Tests.Buckle
                 Assert.False(buckle.ToggleBuckle(human, chair));
 
                 // Move near the chair
-                entityManager.GetComponent<TransformComponent>(human).WorldPosition = entityManager.GetComponent<TransformComponent>(chair).WorldPosition + (0.5f, 0);
+                entityManager.GetComponent<TransformComponent>(human).WorldPosition =
+                    entityManager.GetComponent<TransformComponent>(chair).WorldPosition + (0.5f, 0);
 
                 // In range
                 Assert.True(buckle.TryBuckle(human, chair));
@@ -206,7 +209,8 @@ namespace Content.IntegrationTests.Tests.Buckle
         [Test]
         public async Task BuckledDyingDropItemsTest()
         {
-            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings{NoClient = true, ExtraPrototypes = Prototypes});
+            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings
+                {NoClient = true, ExtraPrototypes = Prototypes});
             var server = pairTracker.Pair.Server;
 
             var testMap = await PoolManager.CreateTestMap(pairTracker);
@@ -215,7 +219,7 @@ namespace Content.IntegrationTests.Tests.Buckle
             EntityUid human = default;
             BuckleComponent buckle = null;
             HandsComponent hands = null;
-            SharedBodyComponent body = null;
+            BodyComponent body = null;
 
             await server.WaitIdleAsync();
 
@@ -260,12 +264,13 @@ namespace Content.IntegrationTests.Tests.Buckle
                     Assert.NotNull(hand.HeldEntity);
                 }
 
-                var legs = body.GetPartsOfType(BodyPartType.Leg);
+                var bodySystem = entityManager.System<BodySystem>();
+                var legs = bodySystem.GetBodyChildrenOfType(body.Owner, BodyPartType.Leg, body);
 
                 // Break our guy's kneecaps
                 foreach (var leg in legs)
                 {
-                    body.RemovePart(leg);
+                    bodySystem.DropPart(leg.Id, leg.Component);
                 }
             });
 
@@ -291,7 +296,8 @@ namespace Content.IntegrationTests.Tests.Buckle
         [Test]
         public async Task ForceUnbuckleBuckleTest()
         {
-            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings{NoClient = true, ExtraPrototypes = Prototypes});
+            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings
+                {NoClient = true, ExtraPrototypes = Prototypes});
             var server = pairTracker.Pair.Server;
 
             var testMap = await PoolManager.CreateTestMap(pairTracker);

Content.IntegrationTests/Tests/Disposal/DisposalUnitTest.cs

@@ -9,7 +9,6 @@ using Content.Shared.Disposal;
 using NUnit.Framework;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
-using Robust.Shared.Map;
 using Robust.Shared.Reflection;
 
 namespace Content.IntegrationTests.Tests.Disposal
@@ -78,9 +77,7 @@ namespace Content.IntegrationTests.Tests.Disposal
   id: HumanDummy
   components:
   - type: Body
-    template: HumanoidTemplate
-    preset: HumanPreset
-    centerSlot: torso
+    prototype: Human
   - type: MobState
   - type: Damageable
     damageContainer: Biological
@@ -127,7 +124,8 @@ namespace Content.IntegrationTests.Tests.Disposal
         [Test]
         public async Task Test()
         {
-            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings{NoClient = true, ExtraPrototypes = Prototypes});
+            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings
+                {NoClient = true, ExtraPrototypes = Prototypes});
             var server = pairTracker.Pair.Server;
 
             var testMap = await PoolManager.CreateTestMap(pairTracker);
@@ -147,7 +145,8 @@ namespace Content.IntegrationTests.Tests.Disposal
                 human = entityManager.SpawnEntity("HumanDummy", coordinates);
                 wrench = entityManager.SpawnEntity("WrenchDummy", coordinates);
                 disposalUnit = entityManager.SpawnEntity("DisposalUnitDummy", coordinates);
-                disposalTrunk = entityManager.SpawnEntity("DisposalTrunkDummy", IoCManager.Resolve<IEntityManager>().GetComponent<TransformComponent>(disposalUnit).MapPosition);
+                disposalTrunk = entityManager.SpawnEntity("DisposalTrunkDummy",
+                    IoCManager.Resolve<IEntityManager>().GetComponent<TransformComponent>(disposalUnit).MapPosition);
 
                 // Test for components existing
                 ref DisposalUnitComponent? comp = ref unit!;
@@ -197,7 +196,7 @@ namespace Content.IntegrationTests.Tests.Disposal
                 // Remove power need
                 Assert.True(entityManager.TryGetComponent(disposalUnit, out ApcPowerReceiverComponent power));
                 power!.NeedsPower = false;
-                unit.Powered = true;//Power state changed event doesn't get fired smh
+                unit.Powered = true; //Power state changed event doesn't get fired smh
 
                 // Flush with a mob and an item
                 Flush(unit, true, human, wrench);

Content.IntegrationTests/Tests/GameObjects/Components/ActionBlocking/HandCuffTest.cs

@@ -26,9 +26,7 @@ namespace Content.IntegrationTests.Tests.GameObjects.Components.ActionBlocking
   - type: Cuffable
   - type: Hands
   - type: Body
-    template: HumanoidTemplate
-    preset: HumanPreset
-    centerSlot: torso
+    prototype: Human
 
 - type: entity
   name: HandcuffsDummy
@@ -36,10 +34,12 @@ namespace Content.IntegrationTests.Tests.GameObjects.Components.ActionBlocking
   components:
   - type: Handcuff
 ";
+
         [Test]
         public async Task Test()
         {
-            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings{NoClient = true, ExtraPrototypes = Prototypes});
+            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings
+                {NoClient = true, ExtraPrototypes = Prototypes});
             var server = pairTracker.Pair.Server;
 
             EntityUid human;
@@ -63,18 +63,21 @@ namespace Content.IntegrationTests.Tests.GameObjects.Components.ActionBlocking
                 cuffs = entityManager.SpawnEntity("HandcuffsDummy", coordinates);
                 secondCuffs = entityManager.SpawnEntity("HandcuffsDummy", coordinates);
 
-                entityManager.GetComponent<TransformComponent>(human).WorldPosition = entityManager.GetComponent<TransformComponent>(otherHuman).WorldPosition;
+                entityManager.GetComponent<TransformComponent>(human).WorldPosition =
+                    entityManager.GetComponent<TransformComponent>(otherHuman).WorldPosition;
 
                 // Test for components existing
-                Assert.True(entityManager.TryGetComponent(human, out cuffed!), $"Human has no {nameof(CuffableComponent)}");
+                Assert.True(entityManager.TryGetComponent(human, out cuffed!),
+                    $"Human has no {nameof(CuffableComponent)}");
                 Assert.True(entityManager.TryGetComponent(human, out hands!), $"Human has no {nameof(HandsComponent)}");
-                Assert.True(entityManager.TryGetComponent(human, out SharedBodyComponent? _), $"Human has no {nameof(SharedBodyComponent)}");
+                Assert.True(entityManager.TryGetComponent(human, out BodyComponent? _), $"Human has no {nameof(BodyComponent)}");
                 Assert.True(entityManager.TryGetComponent(cuffs, out HandcuffComponent? _), $"Handcuff has no {nameof(HandcuffComponent)}");
                 Assert.True(entityManager.TryGetComponent(secondCuffs, out HandcuffComponent? _), $"Second handcuffs has no {nameof(HandcuffComponent)}");
 
                 // Test to ensure cuffed players register the handcuffs
                 cuffed.TryAddNewCuffs(human, cuffs);
-                Assert.True(cuffed.CuffedHandCount > 0, "Handcuffing a player did not result in their hands being cuffed");
+                Assert.True(cuffed.CuffedHandCount > 0,
+                    "Handcuffing a player did not result in their hands being cuffed");
 
                 // Test to ensure a player with 4 hands will still only have 2 hands cuffed
                 AddHand(cuffed.Owner);
@@ -86,7 +89,6 @@ namespace Content.IntegrationTests.Tests.GameObjects.Components.ActionBlocking
                 // Test to give a player with 4 hands 2 sets of cuffs
                 cuffed.TryAddNewCuffs(human, secondCuffs);
                 Assert.True(cuffed.CuffedHandCount == 4, "Player doesn't have correct amount of hands cuffed");
-
             });
 
             await pairTracker.CleanReturnAsync();

Content.Server/Administration/Commands/AddBodyPartCommand.cs

@@ -1,4 +1,4 @@
-using Content.Server.Body.Components;
+using Content.Server.Body.Systems;
 using Content.Shared.Administration;
 using Robust.Shared.Console;
 
@@ -19,35 +19,28 @@ namespace Content.Server.Administration.Commands
                 return;
             }
 
-            if (!EntityUid.TryParse(args[0], out var entityUid))
+            if (!EntityUid.TryParse(args[0], out var childId))
             {
                 shell.WriteError(Loc.GetString("shell-entity-uid-must-be-number"));
                 return;
             }
 
-            if (!EntityUid.TryParse(args[1], out var storageUid))
+            if (!EntityUid.TryParse(args[1], out var parentId))
             {
                 shell.WriteError(Loc.GetString("shell-entity-uid-must-be-number"));
                 return;
             }
 
             var entityManager = IoCManager.Resolve<IEntityManager>();
+            var bodySystem = entityManager.System<BodySystem>();
 
-            if (entityManager.TryGetComponent<BodyComponent>(storageUid, out var storage)
-                && entityManager.TryGetComponent<BodyPartComponent>(entityUid, out var bodyPart))
+            if (bodySystem.TryCreatePartSlotAndAttach(parentId, args[3], childId))
             {
-                if (storage.TryAddPart(args[3], bodyPart))
-                {
-                    shell.WriteLine($@"Added {entityUid} to {storageUid}.");
-                }
-                else
-                {
-                    shell.WriteError($@"Could not add {entityUid} to {storageUid}.");
-                }
+                shell.WriteLine($@"Added {childId} to {parentId}.");
             }
             else
             {
-                shell.WriteError("Could not insert.");
+                shell.WriteError($@"Could not add {childId} to {parentId}.");
             }
         }
     }

Content.Server/Administration/Commands/AddMechanismCommand.cs

@@ -1,6 +1,5 @@
-using Content.Server.Body.Components;
+using Content.Server.Body.Systems;
 using Content.Shared.Administration;
-using Content.Shared.Body.Components;
 using Robust.Shared.Console;
 
 namespace Content.Server.Administration.Commands
@@ -20,35 +19,28 @@ namespace Content.Server.Administration.Commands
                 return;
             }
 
-            if (!EntityUid.TryParse(args[0], out var entityUid))
+            if (!EntityUid.TryParse(args[0], out var organId))
             {
                 shell.WriteError(Loc.GetString("shell-entity-uid-must-be-number"));
                 return;
             }
 
-            if (!EntityUid.TryParse(args[1], out var storageUid))
+            if (!EntityUid.TryParse(args[1], out var partId))
             {
                 shell.WriteError(Loc.GetString("shell-entity-uid-must-be-number"));
                 return;
             }
 
             var entityManager = IoCManager.Resolve<IEntityManager>();
+            var bodySystem = entityManager.System<BodySystem>();
 
-            if (entityManager.TryGetComponent<BodyPartComponent>(storageUid, out var storage)
-                && entityManager.TryGetComponent<MechanismComponent>(entityUid, out var bodyPart))
+            if (bodySystem.AddOrganToFirstValidSlot(organId, partId))
             {
-                if (storage.TryAddMechanism(bodyPart))
-                {
-                    shell.WriteLine($@"Added {entityUid} to {storageUid}.");
-                }
-                else
-                {
-                    shell.WriteError($@"Could not add {entityUid} to {storageUid}.");
-                }
+                shell.WriteLine($@"Added {organId} to {partId}.");
             }
             else
             {
-                shell.WriteError("Could not insert.");
+                shell.WriteError($@"Could not add {organId} to {partId}.");
             }
         }
     }

Content.Server/Administration/Commands/RemoveBodyPartCommand.cs

@@ -1,4 +1,4 @@
-using Content.Server.Body.Components;
+using Content.Server.Body.Systems;
 using Content.Shared.Administration;
 using Robust.Shared.Console;
 
@@ -26,16 +26,11 @@ namespace Content.Server.Administration.Commands
             }
 
             var entityManager = IoCManager.Resolve<IEntityManager>();
+            var bodySystem = entityManager.System<BodySystem>();
 
-            if (!entityManager.TryGetComponent<TransformComponent>(entityUid, out var transform)) return;
-
-            var parent = transform.ParentUid;
-
-            if (entityManager.TryGetComponent<BodyComponent>(parent, out var body) &&
-                entityManager.TryGetComponent<BodyPartComponent>(entityUid, out var part))
+            if (bodySystem.DropPart(entityUid))
             {
-                body.RemovePart(part);
-
+                shell.WriteLine($"Removed body part {entityManager.ToPrettyString(entityUid)}.");
             }
             else
             {

Content.Server/Administration/Commands/RemoveMechanismCommand.cs

@@ -1,6 +1,5 @@
-using Content.Server.Body.Components;
+using Content.Server.Body.Systems;
 using Content.Shared.Administration;
-using Content.Shared.Body.Components;
 using Robust.Shared.Console;
 
 namespace Content.Server.Administration.Commands
@@ -27,15 +26,11 @@ namespace Content.Server.Administration.Commands
             }
 
             var entityManager = IoCManager.Resolve<IEntityManager>();
+            var bodySystem = entityManager.System<BodySystem>();
 
-            if (!entityManager.TryGetComponent<TransformComponent>(entityUid, out var transform)) return;
-
-            var parent = transform.ParentUid;
-
-            if (entityManager.TryGetComponent<BodyPartComponent>(parent, out var body) &&
-                entityManager.TryGetComponent<MechanismComponent>(entityUid, out var part))
+            if (bodySystem.DropOrgan(entityUid))
             {
-                body.RemoveMechanism(part);
+                shell.WriteLine($"Removed organ {entityManager.ToPrettyString(entityUid)}");
             }
             else
             {

Content.Server/Administration/Systems/AdminVerbSystem.Smites.cs

@@ -103,10 +103,7 @@ public sealed partial class AdminVerbSystem
                         4, 1, 2, maxTileBreak: 0), // it gibs, damage doesn't need to be high.
                     CancellationToken.None);
 
-                if (TryComp(args.Target, out SharedBodyComponent? body))
-                {
-                    body.Gib();
-                }
+                _bodySystem.GibBody(args.Target);
             },
             Impact = LogImpact.Extreme,
             Message = Loc.GetString("admin-smite-explode-description")
@@ -308,15 +305,15 @@ public sealed partial class AdminVerbSystem
                 Act = () =>
                 {
                     _vomitSystem.Vomit(args.Target, -1000, -1000); // You feel hollow!
-                    var organs = _bodySystem.GetComponentsOnMechanisms<TransformComponent>(args.Target, body);
+                    var organs = _bodySystem.GetBodyOrganComponents<TransformComponent>(args.Target, body);
                     var baseXform = Transform(args.Target);
-                    foreach (var (xform, mechanism) in organs)
+                    foreach (var (xform, organ) in organs)
                     {
                         if (HasComp<BrainComponent>(xform.Owner) || HasComp<EyeComponent>(xform.Owner))
                             continue;
 
-                        mechanism.Part?.RemoveMechanism(mechanism);
-                        xform.Coordinates = baseXform.Coordinates.Offset(_random.NextVector2(0.5f,0.75f));
+                        var coordinates = baseXform.Coordinates.Offset(_random.NextVector2(0.5f, 0.75f));
+                        _bodySystem.DropOrganAt(organ.Owner, coordinates, organ);
                     }
 
                     _popupSystem.PopupEntity(Loc.GetString("admin-smite-vomit-organs-self"), args.Target,
@@ -337,10 +334,9 @@ public sealed partial class AdminVerbSystem
                 Act = () =>
                 {
                     var baseXform = Transform(args.Target);
-                    foreach (var part in body.GetPartsOfType(BodyPartType.Hand))
+                    foreach (var part in _bodySystem.GetBodyChildrenOfType(args.Target, BodyPartType.Hand))
                     {
-                        body.RemovePart(part);
-                        Transform(part.Owner).Coordinates = baseXform.Coordinates;
+                        _bodySystem.DropPartAt(part.Id, baseXform.Coordinates, part.Component);
                     }
                     _popupSystem.PopupEntity(Loc.GetString("admin-smite-remove-hands-self"), args.Target,
                         Filter.Entities(args.Target), PopupType.LargeCaution);
@@ -360,10 +356,9 @@ public sealed partial class AdminVerbSystem
                 Act = () =>
                 {
                     var baseXform = Transform(args.Target);
-                    foreach (var part in body.GetPartsOfType(BodyPartType.Hand))
+                    foreach (var part in _bodySystem.GetBodyChildrenOfType(body.Owner, BodyPartType.Hand, body))
                     {
-                        body.RemovePart(part);
-                        Transform(part.Owner).Coordinates = baseXform.Coordinates;
+                        _bodySystem.DropPartAt(part.Id, baseXform.Coordinates, part.Component);
                         break;
                     }
                     _popupSystem.PopupEntity(Loc.GetString("admin-smite-remove-hands-self"), args.Target,
@@ -383,13 +378,9 @@ public sealed partial class AdminVerbSystem
                 IconTexture = "/Textures/Mobs/Species/Human/organs.rsi/stomach.png",
                 Act = () =>
                 {
-                    foreach (var part in body.Parts)
+                    foreach (var (component, _) in _bodySystem.GetBodyOrganComponents<StomachComponent>(args.Target, body))
                     {
-                        foreach (var mechanism in part.Key.Mechanisms)
-                        {
-                            if (HasComp<StomachComponent>(mechanism.Owner))
-                                QueueDel(mechanism.Owner);
-                        }
+                        QueueDel(component.Owner);
                     }
 
                     _popupSystem.PopupEntity(Loc.GetString("admin-smite-stomach-removal-self"), args.Target,
@@ -407,13 +398,9 @@ public sealed partial class AdminVerbSystem
                 IconTexture = "/Textures/Mobs/Species/Human/organs.rsi/lung-r.png",
                 Act = () =>
                 {
-                    foreach (var part in body.Parts)
+                    foreach (var (component, _) in _bodySystem.GetBodyOrganComponents<LungComponent>(args.Target, body))
                     {
-                        foreach (var mechanism in part.Key.Mechanisms)
-                        {
-                            if (HasComp<LungComponent>(mechanism.Owner))
-                                QueueDel(mechanism.Owner);
-                        }
+                        QueueDel(component.Owner);
                     }
 
                     _popupSystem.PopupEntity(Loc.GetString("admin-smite-lung-removal-self"), args.Target,

Content.Server/Bed/BedSystem.cs

@@ -1,19 +1,19 @@
-using Content.Shared.Damage;
+using Content.Server.Actions;
 using Content.Server.Bed.Components;
-using Content.Server.Buckle.Components;
-using Content.Server.Body.Systems;
-using Content.Shared.Buckle.Components;
-using Content.Shared.Body.Components;
-using Content.Shared.Bed;
-using Content.Shared.Bed.Sleep;
 using Content.Server.Bed.Sleep;
+using Content.Server.Body.Systems;
+using Content.Server.Buckle.Components;
+using Content.Server.MobState;
 using Content.Server.Power.Components;
 using Content.Server.Power.EntitySystems;
-using Content.Shared.Emag.Systems;
-using Content.Server.Actions;
-using Content.Server.Construction;
-using Content.Server.MobState;
 using Content.Shared.Actions.ActionTypes;
+using Content.Shared.Bed;
+using Content.Shared.Bed.Sleep;
+using Content.Shared.Body.Components;
+using Content.Shared.Buckle.Components;
+using Content.Shared.Damage;
+using Content.Shared.Emag.Systems;
+using Content.Server.Construction;
 using Robust.Shared.Prototypes;
 
 namespace Content.Server.Bed
@@ -26,6 +26,7 @@ namespace Content.Server.Bed
         [Dependency] private readonly SleepingSystem _sleepingSystem = default!;
         [Dependency] private readonly SharedAppearanceSystem _appearance = default!;
         [Dependency] private readonly MobStateSystem _mobStateSystem = default!;
+
         public override void Initialize()
         {
             base.Initialize();
@@ -94,7 +95,7 @@ namespace Content.Server.Bed
         {
             // In testing this also received an unbuckle event when the bed is destroyed
             // So don't worry about that
-            if (!HasComp<SharedBodyComponent>(args.BuckledEntity))
+            if (!HasComp<BodyComponent>(args.BuckledEntity))
                 return;
 
             if (!this.IsPowered(uid, EntityManager))
@@ -143,4 +144,3 @@ namespace Content.Server.Bed
         }
     }
 }
-

Content.Server/Body/Commands/AddHandCommand.cs

@@ -1,6 +1,9 @@
+using System.Linq;
 using Content.Server.Administration;
+using Content.Server.Body.Systems;
 using Content.Shared.Administration;
 using Content.Shared.Body.Components;
+using Content.Shared.Body.Part;
 using Robust.Server.Player;
 using Robust.Shared.Console;
 using Robust.Shared.Prototypes;
@@ -118,7 +121,7 @@ namespace Content.Server.Body.Commands
                 }
             }
 
-            if (!entityManager.TryGetComponent(entity, out SharedBodyComponent? body))
+            if (!entityManager.TryGetComponent(entity, out BodyComponent? body) || body.Root == null)
             {
                 var random = IoCManager.Resolve<IRobustRandom>();
                 var text = $"You have no body{(random.Prob(0.2f) ? " and you must scream." : ".")}";
@@ -127,14 +130,25 @@ namespace Content.Server.Body.Commands
                 return;
             }
 
-            if (!entityManager.TryGetComponent(hand, out SharedBodyPartComponent? part))
+            if (!entityManager.TryGetComponent(hand, out BodyPartComponent? part))
             {
-                shell.WriteLine($"Hand entity {hand} does not have a {nameof(SharedBodyPartComponent)} component.");
+                shell.WriteLine($"Hand entity {hand} does not have a {nameof(BodyPartComponent)} component.");
                 return;
             }
 
-            var slot = part.GetHashCode().ToString();
-            body.SetPart(slot, part);
+            var bodySystem = entityManager.System<BodySystem>();
+
+            var attachAt = bodySystem.GetBodyChildrenOfType(entity, BodyPartType.Arm, body).FirstOrDefault();
+            if (attachAt == default)
+                attachAt = bodySystem.GetBodyChildren(entity, body).First();
+
+            var slotId = part.GetHashCode().ToString();
+
+            if (!bodySystem.TryCreatePartSlotAndAttach(attachAt.Id, slotId, hand, attachAt.Component, part))
+            {
+                shell.WriteError($"Couldn't create a slot with id {slotId} on entity {entityManager.ToPrettyString(entity)}");
+                return;
+            }
 
             shell.WriteLine($"Added hand to entity {entityManager.GetComponent<MetaDataComponent>(entity).EntityName}");
         }

Content.Server/Body/Commands/AttachBodyPartCommand.cs

@@ -1,6 +1,9 @@
+using System.Linq;
 using Content.Server.Administration;
+using Content.Server.Body.Systems;
 using Content.Shared.Administration;
 using Content.Shared.Body.Components;
+using Content.Shared.Body.Part;
 using Robust.Server.Player;
 using Robust.Shared.Console;
 
@@ -18,7 +21,7 @@ namespace Content.Server.Body.Commands
             var player = shell.Player as IPlayerSession;
             var entityManager = IoCManager.Resolve<IEntityManager>();
 
-            EntityUid entity;
+            EntityUid bodyId;
             EntityUid partUid;
 
             switch (args.Length)
@@ -42,7 +45,7 @@ namespace Content.Server.Body.Commands
                         return;
                     }
 
-                    entity = player.AttachedEntity.Value;
+                    bodyId = player.AttachedEntity.Value;
 
                     break;
                 case 2:
@@ -64,16 +67,16 @@ namespace Content.Server.Body.Commands
                         return;
                     }
 
-                    entity = entityUid;
+                    bodyId = entityUid;
                     break;
                 default:
                     shell.WriteLine(Help);
                     return;
             }
 
-            if (!entityManager.TryGetComponent(entity, out SharedBodyComponent? body))
+            if (!entityManager.TryGetComponent(bodyId, out BodyComponent? body))
             {
-                shell.WriteLine($"Entity {entityManager.GetComponent<MetaDataComponent>(entity).EntityName} with uid {entity} does not have a {nameof(SharedBodyComponent)} component.");
+                shell.WriteLine($"Entity {entityManager.GetComponent<MetaDataComponent>(bodyId).EntityName} with uid {bodyId} does not have a {nameof(BodyComponent)}.");
                 return;
             }
 
@@ -83,19 +86,39 @@ namespace Content.Server.Body.Commands
                 return;
             }
 
-            if (!entityManager.TryGetComponent(partUid, out SharedBodyPartComponent? part))
+            if (!entityManager.TryGetComponent(partUid, out BodyPartComponent? part))
             {
-                shell.WriteLine($"Entity {entityManager.GetComponent<MetaDataComponent>(partUid).EntityName} with uid {args[0]} does not have a {nameof(SharedBodyPartComponent)} component.");
+                shell.WriteLine($"Entity {entityManager.GetComponent<MetaDataComponent>(partUid).EntityName} with uid {args[0]} does not have a {nameof(BodyPartComponent)}.");
                 return;
             }
 
-            if (body.HasPart(part))
+            var bodySystem = entityManager.System<BodySystem>();
+            if (bodySystem.BodyHasChild(bodyId, partUid, body, part))
             {
-                shell.WriteLine($"Body part {entityManager.GetComponent<MetaDataComponent>(partUid).EntityName} with uid {partUid} is already attached to entity {entityManager.GetComponent<MetaDataComponent>(entity).EntityName} with uid {entity}");
+                shell.WriteLine($"Body part {entityManager.GetComponent<MetaDataComponent>(partUid).EntityName} with uid {partUid} is already attached to entity {entityManager.GetComponent<MetaDataComponent>(bodyId).EntityName} with uid {bodyId}");
                 return;
             }
 
-            body.SetPart($"AttachBodyPartVerb-{partUid}", part);
+            var slotId = $"AttachBodyPartVerb-{partUid}";
+
+            // ReSharper disable once ConditionIsAlwaysTrueOrFalseAccordingToNullableAPIContract
+            if (bodySystem.TryCreateBodyRootSlot(bodyId, slotId, out var rootSlot, body))
+            {
+                bodySystem.DropPart(partUid, part);
+                bodySystem.AttachPart(partUid, rootSlot, part);
+            }
+            else
+            {
+                var attachAt = bodySystem.GetBodyChildren(bodyId, body).First();
+
+                if (!bodySystem.TryCreatePartSlotAndAttach(attachAt.Id, slotId, partUid, attachAt.Component, part))
+                {
+                    shell.WriteError($"Could not create slot {slotId} on entity {entityManager.ToPrettyString(bodyId)}");
+                    return;
+                }
+            }
+
+            shell.WriteLine($"Attached part {entityManager.ToPrettyString(partUid)} to {entityManager.ToPrettyString(bodyId)}");
         }
     }
 }

Content.Server/Body/Commands/DestroyMechanismCommand.cs

@@ -1,4 +1,5 @@
 using Content.Server.Administration;
+using Content.Server.Body.Systems;
 using Content.Shared.Administration;
 using Content.Shared.Body.Components;
 using Robust.Server.Player;
@@ -35,7 +36,8 @@ namespace Content.Server.Body.Commands
                 return;
             }
 
-            if (!IoCManager.Resolve<IEntityManager>().TryGetComponent(attached, out SharedBodyComponent? body))
+            var entityManager = IoCManager.Resolve<IEntityManager>();
+            if (!entityManager.TryGetComponent(attached, out BodyComponent? body))
             {
                 var random = IoCManager.Resolve<IRobustRandom>();
                 var text = $"You have no body{(random.Prob(0.2f) ? " and you must scream." : ".")}";
@@ -45,13 +47,13 @@ namespace Content.Server.Body.Commands
             }
 
             var mechanismName = string.Join(" ", args).ToLowerInvariant();
+            var bodySystem = entityManager.System<BodySystem>();
 
-            foreach (var (part, _) in body.Parts)
-            foreach (var mechanism in part.Mechanisms)
+            foreach (var organ in bodySystem.GetBodyOrgans(body.Owner, body))
             {
-                if (mechanism.Name.ToLowerInvariant() == mechanismName)
+                if (organ.Component.Name.ToLowerInvariant() == mechanismName)
                 {
-                    part.DeleteMechanism(mechanism);
+                    bodySystem.DeleteOrgan(organ.Id, organ.Component);
                     shell.WriteLine($"Mechanism with name {mechanismName} has been destroyed.");
                     return;
                 }

Content.Server/Body/Commands/RemoveHandCommand.cs

@@ -1,5 +1,6 @@
 using System.Linq;
 using Content.Server.Administration;
+using Content.Server.Body.Systems;
 using Content.Shared.Administration;
 using Content.Shared.Body.Components;
 using Content.Shared.Body.Part;
@@ -31,7 +32,8 @@ namespace Content.Server.Body.Commands
                 return;
             }
 
-            if (!IoCManager.Resolve<IEntityManager>().TryGetComponent(player.AttachedEntity, out SharedBodyComponent? body))
+            var entityManager = IoCManager.Resolve<IEntityManager>();
+            if (!entityManager.TryGetComponent(player.AttachedEntity, out BodyComponent? body))
             {
                 var random = IoCManager.Resolve<IRobustRandom>();
                 var text = $"You have no body{(random.Prob(0.2f) ? " and you must scream." : ".")}";
@@ -40,15 +42,16 @@ namespace Content.Server.Body.Commands
                 return;
             }
 
-            var hand = body.GetPartsOfType(BodyPartType.Hand).FirstOrDefault();
+            var bodySystem = entityManager.System<BodySystem>();
+            var hand = bodySystem.GetBodyChildrenOfType(player.AttachedEntity, BodyPartType.Hand, body).FirstOrDefault();
 
-            if (hand == null)
+            if (hand == default)
             {
                 shell.WriteLine("You have no hands.");
             }
             else
             {
-                body.RemovePart(hand);
+                bodySystem.DropPart(hand.Id, hand.Component);
             }
         }
     }

Content.Server/Body/Components/BeingGibbedEvent.cs

@@ -0,0 +1,11 @@
+namespace Content.Server.Body.Components;
+
+public sealed class BeingGibbedEvent : EntityEventArgs
+{
+    public readonly HashSet<EntityUid> GibbedParts;
+
+    public BeingGibbedEvent(HashSet<EntityUid> gibbedParts)
+    {
+        GibbedParts = gibbedParts;
+    }
+}

Content.Server/Body/Components/BodyComponent.cs

@@ -1,162 +0,0 @@
-using Content.Server.Humanoid;
-using Content.Shared.Audio;
-using Content.Shared.Body.Components;
-using Content.Shared.Body.Part;
-using Content.Shared.Humanoid;
-using Content.Shared.Random.Helpers;
-using Robust.Shared.Audio;
-using Robust.Shared.Containers;
-using Robust.Shared.Player;
-
-namespace Content.Server.Body.Components
-{
-    [RegisterComponent]
-    [ComponentReference(typeof(SharedBodyComponent))]
-    public sealed class BodyComponent : SharedBodyComponent
-    {
-        [Dependency] private readonly IEntityManager _entMan = default!;
-
-        private Container _partContainer = default!;
-
-        [DataField("gibSound")] private SoundSpecifier _gibSound = new SoundCollectionSpecifier("gib");
-
-        protected override bool CanAddPart(string slotId, SharedBodyPartComponent part)
-        {
-            return base.CanAddPart(slotId, part) &&
-                   _partContainer.CanInsert(part.Owner);
-        }
-
-        protected override void OnAddPart(BodyPartSlot slot, SharedBodyPartComponent part)
-        {
-            base.OnAddPart(slot, part);
-
-            _partContainer.Insert(part.Owner);
-
-            if (_entMan.TryGetComponent<HumanoidComponent>(Owner, out var humanoid))
-            {
-                var layer = part.ToHumanoidLayers();
-                if (layer != null)
-                {
-                    var layers = HumanoidVisualLayersExtension.Sublayers(layer.Value);
-                    _entMan.System<HumanoidSystem>().SetLayersVisibility(Owner, layers, true, true, humanoid);
-                }
-            }
-        }
-
-        protected override void OnRemovePart(BodyPartSlot slot, SharedBodyPartComponent part)
-        {
-            base.OnRemovePart(slot, part);
-
-            _partContainer.ForceRemove(part.Owner);
-            part.Owner.RandomOffset(0.25f);
-
-            if (_entMan.TryGetComponent<HumanoidComponent>(Owner, out var humanoid))
-            {
-                var layer = part.ToHumanoidLayers();
-                if (layer != null)
-                {
-                    var layers = HumanoidVisualLayersExtension.Sublayers(layer.Value);
-                    _entMan.System<HumanoidSystem>().SetLayersVisibility(Owner, layers, false, true, humanoid);
-                }
-            }
-        }
-
-        protected override void Initialize()
-        {
-            base.Initialize();
-
-            _partContainer = Owner.EnsureContainer<Container>($"{Name}-{nameof(BodyComponent)}");
-            var preset = Preset;
-
-            if (preset != null)
-            {
-                foreach (var slot in Slots)
-                {
-                    // Using MapPosition instead of Coordinates here prevents
-                    // a crash within the character preview menu in the lobby
-                    var entity = _entMan.SpawnEntity(preset.PartIDs[slot.Id], _entMan.GetComponent<TransformComponent>(Owner).MapPosition);
-
-                    if (!_entMan.TryGetComponent(entity, out SharedBodyPartComponent? part))
-                    {
-                        Logger.Error($"Entity {slot.Id} does not have a {nameof(SharedBodyPartComponent)} component.");
-                        continue;
-                    }
-
-                    SetPart(slot.Id, part);
-                }
-            }
-        }
-
-        protected override void Startup()
-        {
-            base.Startup();
-
-            // This is ran in Startup as entities spawned in Initialize
-            // are not synced to the client since they are assumed to be
-            // identical on it
-            foreach (var (part, _) in Parts)
-            {
-                part.Dirty();
-            }
-        }
-
-        public override HashSet<EntityUid> Gib(bool gibParts = false)
-        {
-            var gibs = base.Gib(gibParts);
-
-            var xform = _entMan.GetComponent<TransformComponent>(Owner);
-            var coordinates = xform.Coordinates;
-
-            // These have already been forcefully removed from containers so run it here.
-            foreach (var part in gibs)
-            {
-                _entMan.EventBus.RaiseLocalEvent(part, new PartGibbedEvent(Owner, gibs), true);
-            }
-
-            SoundSystem.Play(_gibSound.GetSound(), Filter.Pvs(Owner, entityManager: _entMan), coordinates, AudioHelpers.WithVariation(0.025f));
-
-            if (_entMan.TryGetComponent(Owner, out ContainerManagerComponent? container))
-            {
-                foreach (var cont in container.GetAllContainers())
-                {
-                    foreach (var ent in cont.ContainedEntities)
-                    {
-                        cont.ForceRemove(ent);
-                        _entMan.GetComponent<TransformComponent>(ent).Coordinates = coordinates;
-                        ent.RandomOffset(0.25f);
-                    }
-                }
-            }
-
-            _entMan.EventBus.RaiseLocalEvent(Owner, new BeingGibbedEvent(gibs), false);
-            _entMan.QueueDeleteEntity(Owner);
-
-            return gibs;
-        }
-    }
-
-    public sealed class BeingGibbedEvent : EntityEventArgs
-    {
-        public readonly HashSet<EntityUid> GibbedParts;
-
-        public BeingGibbedEvent(HashSet<EntityUid> gibbedParts)
-        {
-            GibbedParts = gibbedParts;
-        }
-    }
-
-    /// <summary>
-    /// An event raised on all the parts of an entity when it's gibbed
-    /// </summary>
-    public sealed class PartGibbedEvent : EntityEventArgs
-    {
-        public EntityUid EntityToGib;
-        public readonly HashSet<EntityUid> GibbedParts;
-
-        public PartGibbedEvent(EntityUid entityToGib, HashSet<EntityUid> gibbedParts)
-        {
-            EntityToGib = entityToGib;
-            GibbedParts = gibbedParts;
-        }
-    }
-}

Content.Server/Body/Components/BodyPartComponent.cs

@@ -1,59 +0,0 @@
-using Content.Shared.Body.Components;
-using Content.Shared.Random.Helpers;
-using Robust.Shared.Containers;
-
-namespace Content.Server.Body.Components
-{
-    [RegisterComponent]
-    [ComponentReference(typeof(SharedBodyPartComponent))]
-    public sealed class BodyPartComponent : SharedBodyPartComponent
-    {
-        [Dependency] private readonly IEntityManager _entMan = default!;
-
-        private Container _mechanismContainer = default!;
-
-        public override bool CanAddMechanism(MechanismComponent mechanism)
-        {
-            return base.CanAddMechanism(mechanism) &&
-                   _mechanismContainer.CanInsert(mechanism.Owner);
-        }
-
-        protected override void OnAddMechanism(MechanismComponent mechanism)
-        {
-            base.OnAddMechanism(mechanism);
-
-            _mechanismContainer.Insert(mechanism.Owner);
-        }
-
-        protected override void OnRemoveMechanism(MechanismComponent mechanism)
-        {
-            base.OnRemoveMechanism(mechanism);
-
-            _mechanismContainer.Remove(mechanism.Owner);
-            mechanism.Owner.RandomOffset(0.25f);
-        }
-
-        public void MapInitialize()
-        {
-            base.Initialize();
-
-            _mechanismContainer = Owner.EnsureContainer<Container>(ContainerId);
-
-            // This is ran in Startup as entities spawned in Initialize
-            // are not synced to the client since they are assumed to be
-            // identical on it
-            foreach (var mechanismId in MechanismIds)
-            {
-                var entity = _entMan.SpawnEntity(mechanismId, _entMan.GetComponent<TransformComponent>(Owner).MapPosition);
-
-                if (!_entMan.TryGetComponent(entity, out MechanismComponent? mechanism))
-                {
-                    Logger.Error($"Entity {mechanismId} does not have a {nameof(MechanismComponent)} component.");
-                    continue;
-                }
-
-                TryAddMechanism(mechanism, true);
-            }
-        }
-    }
-}

Content.Server/Body/Components/BodyScannerComponent.cs

@@ -26,7 +26,7 @@ namespace Content.Server.Body.Components
         /// <summary>
         ///     Copy BodyTemplate and BodyPart data into a common data class that the client can read.
         /// </summary>
-        private BodyScannerUIState InterfaceState(SharedBodyComponent body)
+        private BodyScannerUIState InterfaceState(BodyComponent body)
         {
             return new(body.Owner);
         }

Content.Server/Body/Systems/BodySystem.cs

@@ -1,119 +1,148 @@
 using System.Diagnostics.CodeAnalysis;
 using Content.Server.Body.Components;
 using Content.Server.GameTicking;
+using Content.Server.Humanoid;
 using Content.Server.Kitchen.Components;
 using Content.Server.Mind.Components;
 using Content.Shared.Body.Components;
+using Content.Shared.Body.Part;
+using Content.Shared.Body.Systems;
+using Content.Shared.Humanoid;
 using Content.Shared.MobState.Components;
 using Content.Shared.Movement.Events;
+using Content.Shared.Random.Helpers;
+using Robust.Shared.Audio;
+using Robust.Shared.Containers;
+using Robust.Shared.Player;
 using Robust.Shared.Timing;
 
-namespace Content.Server.Body.Systems
+namespace Content.Server.Body.Systems;
+
+public sealed class BodySystem : SharedBodySystem
 {
-    public sealed class BodySystem : EntitySystem
+    [Dependency] private readonly GameTicker _ticker = default!;
+    [Dependency] private readonly IGameTiming _gameTiming = default!;
+
+    [Dependency] private readonly HumanoidSystem _humanoidSystem = default!;
+    [Dependency] private readonly SharedAudioSystem _audio = default!;
+
+    public override void Initialize()
     {
-        [Dependency] private readonly GameTicker _ticker = default!;
-        [Dependency] private readonly IGameTiming _gameTiming = default!;
+        base.Initialize();
 
-        public override void Initialize()
-        {
-            base.Initialize();
-            SubscribeLocalEvent<BodyComponent, MoveInputEvent>(OnRelayMoveInput);
-            SubscribeLocalEvent<BodyComponent, ApplyMetabolicMultiplierEvent>(OnApplyMetabolicMultiplier);
-            SubscribeLocalEvent<BodyComponent, BeingMicrowavedEvent>(OnBeingMicrowaved);
-            SubscribeLocalEvent<BodyPartComponent, MapInitEvent>((_, c, _) => c.MapInitialize());
-        }
+        SubscribeLocalEvent<BodyComponent, MoveInputEvent>(OnRelayMoveInput);
+        SubscribeLocalEvent<BodyComponent, ApplyMetabolicMultiplierEvent>(OnApplyMetabolicMultiplier);
+        SubscribeLocalEvent<BodyComponent, BeingMicrowavedEvent>(OnBeingMicrowaved);
+    }
 
-        private void OnRelayMoveInput(EntityUid uid, BodyComponent component, ref MoveInputEvent args)
+    private void OnRelayMoveInput(EntityUid uid, BodyComponent component, ref MoveInputEvent args)
+    {
+        if (EntityManager.TryGetComponent<MobStateComponent>(uid, out var mobState) &&
+            mobState.IsDead() &&
+            EntityManager.TryGetComponent<MindComponent>(uid, out var mind) &&
+            mind.HasMind)
         {
-            if (EntityManager.TryGetComponent<MobStateComponent>(uid, out var mobState) &&
-                mobState.IsDead() &&
-                EntityManager.TryGetComponent<MindComponent>(uid, out var mind) &&
-                mind.HasMind)
+            if (!mind.Mind!.TimeOfDeath.HasValue)
             {
-                if (!mind.Mind!.TimeOfDeath.HasValue)
-                {
-                    mind.Mind.TimeOfDeath = _gameTiming.RealTime;
-                }
-
-                _ticker.OnGhostAttempt(mind.Mind!, true);
-            }
-        }
-
-        private void OnApplyMetabolicMultiplier(EntityUid uid, BodyComponent component, ApplyMetabolicMultiplierEvent args)
-        {
-            foreach (var (part, _) in component.Parts)
-            foreach (var mechanism in part.Mechanisms)
-            {
-                RaiseLocalEvent(mechanism.Owner, args, false);
-            }
-        }
-
-        private void OnBeingMicrowaved(EntityUid uid, BodyComponent component, BeingMicrowavedEvent args)
-        {
-            if (args.Handled)
-                return;
-
-            // Don't microwave animals, kids
-            Transform(uid).AttachToGridOrMap();
-            component.Gib();
-
-            args.Handled = true;
-        }
-
-        /// <summary>
-        ///     Returns a list of ValueTuples of <see cref="T"/> and MechanismComponent on each mechanism
-        ///     in the given body.
-        /// </summary>
-        /// <param name="uid">The entity to check for the component on.</param>
-        /// <param name="body">The body to check for mechanisms on.</param>
-        /// <typeparam name="T">The component to check for.</typeparam>
-        public List<(T Comp, MechanismComponent Mech)> GetComponentsOnMechanisms<T>(EntityUid uid,
-            SharedBodyComponent? body=null) where T : Component
-        {
-            if (!Resolve(uid, ref body))
-                return new();
-
-            var query = EntityManager.GetEntityQuery<T>();
-            var list = new List<(T Comp, MechanismComponent Mech)>(3);
-            foreach (var (part, _) in body.Parts)
-            foreach (var mechanism in part.Mechanisms)
-            {
-                if (query.TryGetComponent(mechanism.Owner, out var comp))
-                    list.Add((comp, mechanism));
+                mind.Mind.TimeOfDeath = _gameTiming.RealTime;
             }
 
-            return list;
-        }
-
-        /// <summary>
-        ///     Tries to get a list of ValueTuples of <see cref="T"/> and MechanismComponent on each mechanism
-        ///     in the given body.
-        /// </summary>
-        /// <param name="uid">The entity to check for the component on.</param>
-        /// <param name="comps">The list of components.</param>
-        /// <param name="body">The body to check for mechanisms on.</param>
-        /// <typeparam name="T">The component to check for.</typeparam>
-        /// <returns>Whether any were found.</returns>
-        public bool TryGetComponentsOnMechanisms<T>(EntityUid uid,
-            [NotNullWhen(true)] out List<(T Comp, MechanismComponent Mech)>? comps,
-            SharedBodyComponent? body=null) where T: Component
-        {
-            if (!Resolve(uid, ref body))
-            {
-                comps = null;
-                return false;
-            }
-
-            comps = GetComponentsOnMechanisms<T>(uid, body);
-
-            if (comps.Count == 0)
-            {
-                comps = null;
-                return false;
-            }
-
-            return true;
+            _ticker.OnGhostAttempt(mind.Mind!, true);
         }
     }
+
+    private void OnApplyMetabolicMultiplier(EntityUid uid, BodyComponent component,
+        ApplyMetabolicMultiplierEvent args)
+    {
+        foreach (var organ in GetBodyOrgans(uid, component))
+        {
+            RaiseLocalEvent(organ.Id, args);
+        }
+    }
+
+    private void OnBeingMicrowaved(EntityUid uid, BodyComponent component, BeingMicrowavedEvent args)
+    {
+        if (args.Handled)
+            return;
+
+        // Don't microwave animals, kids
+        Transform(uid).AttachToGridOrMap();
+        GibBody(uid, false, component);
+
+        args.Handled = true;
+    }
+
+    public override bool AttachPart(
+        EntityUid? partId,
+        BodyPartSlot slot,
+        [NotNullWhen(true)] BodyPartComponent? part = null)
+    {
+        if (!base.AttachPart(partId, slot, part))
+            return false;
+
+        if (part.Body is { } body &&
+            TryComp<HumanoidComponent>(body, out var humanoid))
+        {
+            var layer = part.ToHumanoidLayers();
+            if (layer != null)
+            {
+                var layers = HumanoidVisualLayersExtension.Sublayers(layer.Value);
+                _humanoidSystem.SetLayersVisibility(body, layers, true, true, humanoid);
+            }
+        }
+
+        return true;
+    }
+
+    public override bool DropPart(EntityUid? partId, BodyPartComponent? part = null)
+    {
+        var oldBody = CompOrNull<BodyPartComponent>(partId)?.Body;
+
+        if (!base.DropPart(partId, part))
+            return false;
+
+        if (oldBody == null || !TryComp<HumanoidComponent>(oldBody, out var humanoid))
+            return true;
+
+        var layer = part.ToHumanoidLayers();
+        if (layer == null)
+            return true;
+
+        var layers = HumanoidVisualLayersExtension.Sublayers(layer.Value);
+        _humanoidSystem.SetLayersVisibility(oldBody.Value, layers, false, true, humanoid);
+        return true;
+    }
+
+    public override HashSet<EntityUid> GibBody(EntityUid? bodyId, bool gibOrgans = false, BodyComponent? body = null)
+    {
+        if (bodyId == null || !Resolve(bodyId.Value, ref body, false))
+            return new HashSet<EntityUid>();
+
+        var gibs = base.GibBody(bodyId, gibOrgans, body);
+
+        var xform = Transform(bodyId.Value);
+        var coordinates = xform.Coordinates;
+        var filter = Filter.Pvs(bodyId.Value, entityManager: EntityManager);
+        var audio = AudioParams.Default.WithVariation(0.025f);
+
+        _audio.Play(body.GibSound, filter, coordinates, audio);
+
+        if (TryComp(bodyId, out ContainerManagerComponent? container))
+        {
+            foreach (var cont in container.GetAllContainers())
+            {
+                foreach (var ent in cont.ContainedEntities)
+                {
+                    cont.ForceRemove(ent);
+                    Transform(ent).Coordinates = coordinates;
+                    ent.RandomOffset(0.25f);
+                }
+            }
+        }
+
+        RaiseLocalEvent(bodyId.Value, new BeingGibbedEvent(gibs));
+        QueueDel(bodyId.Value);
+
+        return gibs;
+    }
 }

Content.Server/Body/Systems/BrainSystem.cs

@@ -3,6 +3,7 @@ using Content.Server.Ghost.Components;
 using Content.Server.Mind.Components;
 using Content.Shared.Body.Components;
 using Content.Shared.Body.Events;
+using Content.Shared.Body.Organ;
 using Content.Shared.Movement.Components;
 
 namespace Content.Server.Body.Systems
@@ -13,21 +14,22 @@ namespace Content.Server.Body.Systems
         {
             base.Initialize();
 
-            SubscribeLocalEvent<BrainComponent, AddedToBodyEvent>((uid, _, args) => HandleMind((args.Body).Owner, uid));
-            SubscribeLocalEvent<BrainComponent, AddedToPartEvent>((uid, _, args) => HandleMind((args.Part).Owner, uid));
-            SubscribeLocalEvent<BrainComponent, AddedToPartInBodyEvent>((uid, _, args) => HandleMind((args.Body).Owner, uid));
+            SubscribeLocalEvent<BrainComponent, AddedToBodyEvent>((uid, _, args) => HandleMind(args.Body, uid));
+            SubscribeLocalEvent<BrainComponent, AddedToPartEvent>((uid, _, args) => HandleMind(args.Part, uid));
+            SubscribeLocalEvent<BrainComponent, AddedToPartInBodyEvent>((uid, _, args) => HandleMind(args.Body, uid));
             SubscribeLocalEvent<BrainComponent, RemovedFromBodyEvent>(OnRemovedFromBody);
-            SubscribeLocalEvent<BrainComponent, RemovedFromPartEvent>((uid, _, args) => HandleMind(uid, (args.Old).Owner));
-            SubscribeLocalEvent<BrainComponent, RemovedFromPartInBodyEvent>((uid, _, args) => HandleMind((args.OldBody).Owner, uid));
+            SubscribeLocalEvent<BrainComponent, RemovedFromPartEvent>((uid, _, args) => HandleMind(uid, args.Old));
+            SubscribeLocalEvent<BrainComponent, RemovedFromPartInBodyEvent>((uid, _, args) => HandleMind(args.OldBody, uid));
         }
 
         private void OnRemovedFromBody(EntityUid uid, BrainComponent component, RemovedFromBodyEvent args)
         {
             // This one needs to be special, okay?
-            if (!EntityManager.TryGetComponent(uid, out MechanismComponent? mech))
+            if (!EntityManager.TryGetComponent(uid, out OrganComponent? organ) ||
+                organ.ParentSlot is not {Parent: var parent})
                 return;
 
-            HandleMind((mech.Part!).Owner, (args.Old).Owner);
+            HandleMind(parent, args.Old);
         }
 
         private void HandleMind(EntityUid newEntity, EntityUid oldEntity)

Content.Server/Body/Systems/MetabolizerSystem.cs

@@ -3,7 +3,7 @@ using Content.Server.Body.Components;
 using Content.Server.Chemistry.Components.SolutionManager;
 using Content.Server.Chemistry.EntitySystems;
 using Content.Shared.Administration.Logs;
-using Content.Shared.Body.Components;
+using Content.Shared.Body.Organ;
 using Content.Shared.Chemistry.Components;
 using Content.Shared.Chemistry.Reagent;
 using Content.Shared.Database;
@@ -18,6 +18,7 @@ namespace Content.Server.Body.Systems
     [UsedImplicitly]
     public sealed class MetabolizerSystem : EntitySystem
     {
+        [Dependency] private readonly BodySystem _bodySystem = default!;
         [Dependency] private readonly SolutionContainerSystem _solutionContainerSystem = default!;
         [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
         [Dependency] private readonly IRobustRandom _random = default!;
@@ -37,30 +38,27 @@ namespace Content.Server.Body.Systems
             {
                 _solutionContainerSystem.EnsureSolution(uid, component.SolutionName);
             }
-            else
+            else if (CompOrNull<OrganComponent>(uid)?.Body is { } body)
             {
-                if (EntityManager.TryGetComponent<MechanismComponent>(uid, out var mech))
-                {
-                    if (mech.Body != null)
-                    {
-                        _solutionContainerSystem.EnsureSolution((mech.Body).Owner, component.SolutionName);
-                    }
-                }
+                _solutionContainerSystem.EnsureSolution(body, component.SolutionName);
             }
         }
 
-        private void OnApplyMetabolicMultiplier(EntityUid uid, MetabolizerComponent component, ApplyMetabolicMultiplierEvent args)
+        private void OnApplyMetabolicMultiplier(EntityUid uid, MetabolizerComponent component,
+            ApplyMetabolicMultiplierEvent args)
         {
             if (args.Apply)
             {
                 component.UpdateFrequency *= args.Multiplier;
                 return;
             }
+
             component.UpdateFrequency /= args.Multiplier;
             // Reset the accumulator properly
             if (component.AccumulatedFrametime >= component.UpdateFrequency)
                 component.AccumulatedFrametime = component.UpdateFrequency;
         }
+
         public override void Update(float frameTime)
         {
             base.Update(frameTime);
@@ -78,33 +76,27 @@ namespace Content.Server.Body.Systems
             }
         }
 
-        private void TryMetabolize(EntityUid uid, MetabolizerComponent? meta=null, MechanismComponent? mech=null)
+        private void TryMetabolize(EntityUid uid, MetabolizerComponent? meta = null, OrganComponent? organ = null)
         {
             if (!Resolve(uid, ref meta))
                 return;
 
-            Resolve(uid, ref mech, false);
+            Resolve(uid, ref organ, false);
 
             // First step is get the solution we actually care about
             Solution? solution = null;
             EntityUid? solutionEntityUid = null;
-            EntityUid? bodyEntityUid = mech?.Body?.Owner;
 
             SolutionContainerManagerComponent? manager = null;
 
             if (meta.SolutionOnBody)
             {
-                if (mech != null)
+                if (organ?.Body is { } body)
                 {
-                    var body = mech.Body;
-
-                    if (body != null)
-                    {
-                        if (!Resolve((body).Owner, ref manager, false))
-                            return;
-                        _solutionContainerSystem.TryGetSolution((body).Owner, meta.SolutionName, out solution, manager);
-                        solutionEntityUid = body.Owner;
-                    }
+                    if (!Resolve(body, ref manager, false))
+                        return;
+                    _solutionContainerSystem.TryGetSolution(body, meta.SolutionName, out solution, manager);
+                    solutionEntityUid = body;
                 }
             }
             else
@@ -133,7 +125,8 @@ namespace Content.Server.Body.Systems
                 if (proto.Metabolisms == null)
                 {
                     if (meta.RemoveEmpty)
-                        _solutionContainerSystem.TryRemoveReagent(solutionEntityUid.Value, solution, reagent.ReagentId, FixedPoint2.New(1));
+                        _solutionContainerSystem.TryRemoveReagent(solutionEntityUid.Value, solution, reagent.ReagentId,
+                            FixedPoint2.New(1));
                     continue;
                 }
 
@@ -170,7 +163,7 @@ namespace Content.Server.Body.Systems
                             continue;
                     }
 
-                    var actualEntity = bodyEntityUid != null ? bodyEntityUid.Value : solutionEntityUid.Value;
+                    var actualEntity = organ?.Body ?? solutionEntityUid.Value;
                     var args = new ReagentEffectArgs(actualEntity, (meta).Owner, solution, proto, mostToRemove,
                         EntityManager, null, entry);
 
@@ -192,16 +185,20 @@ namespace Content.Server.Body.Systems
 
                 // remove a certain amount of reagent
                 if (mostToRemove > FixedPoint2.Zero)
-                    _solutionContainerSystem.TryRemoveReagent(solutionEntityUid.Value, solution, reagent.ReagentId, mostToRemove);
+                    _solutionContainerSystem.TryRemoveReagent(solutionEntityUid.Value, solution, reagent.ReagentId,
+                        mostToRemove);
             }
         }
     }
+
     public sealed class ApplyMetabolicMultiplierEvent : EntityEventArgs
     {
         // The entity whose metabolism is being modified
-        public  EntityUid Uid;
+        public EntityUid Uid;
+
         // What the metabolism's update rate will be multiplied by
-        public  float Multiplier;
+        public float Multiplier;
+
         // Apply this multiplier or ignore / reset it?
         public bool Apply;
     }

Content.Server/Body/Systems/RespiratorSystem.cs

@@ -8,7 +8,6 @@ using Content.Shared.Atmos;
 using Content.Shared.Body.Components;
 using Content.Shared.Damage;
 using Content.Shared.Database;
-using Content.Shared.MobState.Components;
 using Content.Shared.MobState.EntitySystems;
 using JetBrains.Annotations;
 using Robust.Shared.Player;
@@ -42,8 +41,7 @@ namespace Content.Server.Body.Systems
         {
             base.Update(frameTime);
 
-            foreach (var (respirator, body) in
-                     EntityManager.EntityQuery<RespiratorComponent, SharedBodyComponent>())
+            foreach (var (respirator, body) in EntityManager.EntityQuery<RespiratorComponent, BodyComponent>())
             {
                 var uid = respirator.Owner;
 
@@ -91,12 +89,13 @@ namespace Content.Server.Body.Systems
                 respirator.SuffocationCycles = 0;
             }
         }
-        public void Inhale(EntityUid uid, SharedBodyComponent? body=null)
+
+        public void Inhale(EntityUid uid, BodyComponent? body = null)
         {
             if (!Resolve(uid, ref body, false))
                 return;
 
-            var organs = _bodySystem.GetComponentsOnMechanisms<LungComponent>(uid, body);
+            var organs = _bodySystem.GetBodyOrganComponents<LungComponent>(uid, body);
 
             // Inhale gas
             var ev = new InhaleLocationEvent();
@@ -121,12 +120,12 @@ namespace Content.Server.Body.Systems
             }
         }
 
-        public void Exhale(EntityUid uid, SharedBodyComponent? body=null)
+        public void Exhale(EntityUid uid, BodyComponent? body = null)
         {
             if (!Resolve(uid, ref body, false))
                 return;
 
-            var organs = _bodySystem.GetComponentsOnMechanisms<LungComponent>(uid, body);
+            var organs = _bodySystem.GetBodyOrganComponents<LungComponent>(uid, body);
 
             // exhale gas
 
@@ -187,7 +186,8 @@ namespace Content.Server.Body.Systems
                 Math.Clamp(respirator.Saturation, respirator.MinSaturation, respirator.MaxSaturation);
         }
 
-        private void OnApplyMetabolicMultiplier(EntityUid uid, RespiratorComponent component, ApplyMetabolicMultiplierEvent args)
+        private void OnApplyMetabolicMultiplier(EntityUid uid, RespiratorComponent component,
+            ApplyMetabolicMultiplierEvent args)
         {
             if (args.Apply)
             {
@@ -197,6 +197,7 @@ namespace Content.Server.Body.Systems
                 component.MinSaturation *= args.Multiplier;
                 return;
             }
+
             // This way we don't have to worry about it breaking if the stasis bed component is destroyed
             component.CycleDelay /= args.Multiplier;
             component.Saturation /= args.Multiplier;

Content.Server/Body/Systems/StomachSystem.cs

@@ -1,7 +1,7 @@
 using Content.Server.Body.Components;
 using Content.Server.Chemistry.Components.SolutionManager;
 using Content.Server.Chemistry.EntitySystems;
-using Content.Shared.Body.Components;
+using Content.Shared.Body.Organ;
 using Content.Shared.Chemistry.Components;
 using Robust.Shared.Utility;
 
@@ -9,6 +9,7 @@ namespace Content.Server.Body.Systems
 {
     public sealed class StomachSystem : EntitySystem
     {
+        [Dependency] private readonly BodySystem _bodySystem = default!;
         [Dependency] private readonly SolutionContainerSystem _solutionContainerSystem = default!;
 
         public const string DefaultSolutionName = "stomach";
@@ -21,12 +22,8 @@ namespace Content.Server.Body.Systems
 
         public override void Update(float frameTime)
         {
-            foreach (var (stomach, mech, sol)
-                in EntityManager.EntityQuery<StomachComponent, MechanismComponent, SolutionContainerManagerComponent>(false))
+            foreach (var (stomach, organ, sol)in EntityManager.EntityQuery<StomachComponent, OrganComponent, SolutionContainerManagerComponent>())
             {
-                if (mech.Body == null)
-                    continue;
-
                 stomach.AccumulatedFrameTime += frameTime;
 
                 if (stomach.AccumulatedFrameTime < stomach.UpdateInterval)
@@ -35,12 +32,11 @@ namespace Content.Server.Body.Systems
                 stomach.AccumulatedFrameTime -= stomach.UpdateInterval;
 
                 // Get our solutions
-                if (!_solutionContainerSystem.TryGetSolution((stomach).Owner, DefaultSolutionName,
-                    out var stomachSolution, sol))
+                if (!_solutionContainerSystem.TryGetSolution(stomach.Owner, DefaultSolutionName,
+                        out var stomachSolution, sol))
                     continue;
 
-                if (!_solutionContainerSystem.TryGetSolution((mech.Body).Owner, stomach.BodySolutionName,
-                    out var bodySolution))
+                if (organ.Body is not { } body || !_solutionContainerSystem.TryGetSolution(body, stomach.BodySolutionName, out var bodySolution))
                     continue;
 
                 var transferSolution = new Solution();
@@ -71,23 +67,25 @@ namespace Content.Server.Body.Systems
                 }
 
                 // Transfer everything to the body solution!
-                _solutionContainerSystem.TryAddSolution((mech.Body).Owner, bodySolution, transferSolution);
+                _solutionContainerSystem.TryAddSolution(body, bodySolution, transferSolution);
             }
         }
 
-    private void OnApplyMetabolicMultiplier(EntityUid uid, StomachComponent component, ApplyMetabolicMultiplierEvent args)
-    {
-        if (args.Apply)
+        private void OnApplyMetabolicMultiplier(EntityUid uid, StomachComponent component,
+            ApplyMetabolicMultiplierEvent args)
         {
-            component.UpdateInterval *= args.Multiplier;
-            return;
+            if (args.Apply)
+            {
+                component.UpdateInterval *= args.Multiplier;
+                return;
+            }
+
+            // This way we don't have to worry about it breaking if the stasis bed component is destroyed
+            component.UpdateInterval /= args.Multiplier;
+            // Reset the accumulator properly
+            if (component.AccumulatedFrameTime >= component.UpdateInterval)
+                component.AccumulatedFrameTime = component.UpdateInterval;
         }
-        // This way we don't have to worry about it breaking if the stasis bed component is destroyed
-        component.UpdateInterval /= args.Multiplier;
-        // Reset the accumulator properly
-        if (component.AccumulatedFrameTime >= component.UpdateInterval)
-            component.AccumulatedFrameTime = component.UpdateInterval;
-    }
 
         private void OnComponentInit(EntityUid uid, StomachComponent component, ComponentInit args)
         {
@@ -96,7 +94,7 @@ namespace Content.Server.Body.Systems
         }
 
         public bool CanTransferSolution(EntityUid uid, Solution solution,
-            SolutionContainerManagerComponent? solutions=null)
+            SolutionContainerManagerComponent? solutions = null)
         {
             if (!Resolve(uid, ref solutions, false))
                 return false;
@@ -112,8 +110,8 @@ namespace Content.Server.Body.Systems
         }
 
         public bool TryTransferSolution(EntityUid uid, Solution solution,
-            StomachComponent? stomach=null,
-            SolutionContainerManagerComponent? solutions=null)
+            StomachComponent? stomach = null,
+            SolutionContainerManagerComponent? solutions = null)
         {
             if (!Resolve(uid, ref stomach, ref solutions, false))
                 return false;

Content.Server/Cargo/Systems/PricingSystem.cs

@@ -1,10 +1,11 @@
 using System.Linq;
 using Content.Server.Administration;
-using Content.Server.Body.Components;
+using Content.Server.Body.Systems;
 using Content.Server.Cargo.Components;
-using Content.Shared.Materials;
 using Content.Server.Stack;
 using Content.Shared.Administration;
+using Content.Shared.Body.Components;
+using Content.Shared.Materials;
 using Content.Shared.MobState.Components;
 using Robust.Shared.Console;
 using Robust.Shared.Containers;
@@ -22,6 +23,8 @@ public sealed class PricingSystem : EntitySystem
     [Dependency] private readonly IConsoleHost _consoleHost = default!;
     [Dependency] private readonly IMapManager _mapManager = default!;
 
+    [Dependency] private readonly BodySystem _bodySystem = default!;
+
     /// <inheritdoc/>
     public override void Initialize()
     {
@@ -84,8 +87,8 @@ public sealed class PricingSystem : EntitySystem
             return;
         }
 
-        var partList = body.Slots.ToList();
-        var totalPartsPresent = partList.Sum(x => x.Part != null ? 1 : 0);
+        var partList = _bodySystem.GetBodyAllSlots(uid, body).ToList();
+        var totalPartsPresent = partList.Sum(x => x.Child != null ? 1 : 0);
         var totalParts = partList.Count;
 
         var partRatio = totalPartsPresent / (double) totalParts;

Content.Server/Climbing/ClimbSystem.cs

@@ -1,10 +1,9 @@
+using Content.Server.Body.Systems;
 using Content.Server.Climbing.Components;
 using Content.Server.DoAfter;
 using Content.Server.Interaction;
-using Content.Server.Interaction.Components;
 using Content.Server.Popups;
 using Content.Server.Stunnable;
-using Content.Server.Xenoarchaeology.XenoArtifacts.Triggers.Systems;
 using Content.Shared.ActionBlocker;
 using Content.Shared.Body.Components;
 using Content.Shared.Body.Part;
@@ -15,7 +14,6 @@ using Content.Shared.Damage;
 using Content.Shared.DragDrop;
 using Content.Shared.GameTicking;
 using Content.Shared.IdentityManagement;
-using Content.Shared.Interaction;
 using Content.Shared.Physics;
 using Content.Shared.Popups;
 using Content.Shared.Verbs;
@@ -30,7 +28,6 @@ using Robust.Shared.Physics.Dynamics;
 using Robust.Shared.Physics.Events;
 using Robust.Shared.Physics.Systems;
 using Robust.Shared.Player;
-using SharpZstd.Interop;
 
 namespace Content.Server.Climbing;
 
@@ -39,6 +36,7 @@ public sealed class ClimbSystem : SharedClimbSystem
 {
     [Dependency] private readonly IConfigurationManager _cfg = default!;
     [Dependency] private readonly ActionBlockerSystem _actionBlockerSystem = default!;
+    [Dependency] private readonly BodySystem _bodySystem = default!;
     [Dependency] private readonly DamageableSystem _damageableSystem = default!;
     [Dependency] private readonly DoAfterSystem _doAfterSystem = default!;
     [Dependency] private readonly FixtureSystem _fixtureSystem = default!;
@@ -286,9 +284,9 @@ public sealed class ClimbSystem : SharedClimbSystem
         }
 
         if (!HasComp<ClimbingComponent>(user)
-            || !TryComp(user, out SharedBodyComponent? body)
-            || !body.HasPartOfType(BodyPartType.Leg)
-            || !body.HasPartOfType(BodyPartType.Foot))
+            || !TryComp(user, out BodyComponent? body)
+            || !_bodySystem.BodyHasChildOfType(user, BodyPartType.Leg, body)
+            || !_bodySystem.BodyHasChildOfType(user, BodyPartType.Foot, body))
         {
             reason = Loc.GetString("comp-climbable-cant-climb");
             return false;

Content.Server/Destructible/DestructibleSystem.cs

@@ -1,18 +1,19 @@
+using Content.Server.Body.Systems;
+using Content.Server.Chemistry.EntitySystems;
 using Content.Server.Construction;
 using Content.Server.Destructible.Thresholds;
 using Content.Server.Destructible.Thresholds.Behaviors;
 using Content.Server.Destructible.Thresholds.Triggers;
 using Content.Server.Explosion.EntitySystems;
+using Content.Server.Fluids.EntitySystems;
 using Content.Server.Stack;
 using Content.Shared.Damage;
+using Content.Shared.Destructible;
 using Content.Shared.FixedPoint;
 using JetBrains.Annotations;
 using Robust.Server.GameObjects;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Random;
-using Content.Shared.Destructible;
-using Content.Server.Chemistry.EntitySystems;
-using Content.Server.Fluids.EntitySystems;
 
 namespace Content.Server.Destructible
 {
@@ -23,6 +24,7 @@ namespace Content.Server.Destructible
         public new IEntityManager EntityManager => base.EntityManager;
 
         [Dependency] public readonly AudioSystem AudioSystem = default!;
+        [Dependency] public readonly BodySystem BodySystem = default!;
         [Dependency] public readonly ConstructionSystem ConstructionSystem = default!;
         [Dependency] public readonly ExplosionSystem ExplosionSystem = default!;
         [Dependency] public readonly StackSystem StackSystem = default!;

Content.Server/Destructible/Thresholds/Behaviors/GibBehavior.cs

@@ -11,9 +11,9 @@ namespace Content.Server.Destructible.Thresholds.Behaviors
 
         public void Execute(EntityUid owner, DestructibleSystem system)
         {
-            if (system.EntityManager.TryGetComponent(owner, out SharedBodyComponent? body))
+            if (system.EntityManager.TryGetComponent(owner, out BodyComponent? body))
             {
-                body.Gib(_recursive);
+                system.BodySystem.GibBody(owner, _recursive, body);
             }
         }
     }

Content.Server/Disposal/Unit/Components/DisposalHolderComponent.cs

@@ -1,6 +1,5 @@
 using Content.Server.Atmos;
 using Content.Server.Disposal.Tube.Components;
-using Content.Shared.Atmos;
 using Content.Shared.Body.Components;
 using Content.Shared.Item;
 using Robust.Shared.Containers;
@@ -74,7 +73,7 @@ namespace Content.Server.Disposal.Unit.Components
             }
 
             return _entMan.HasComponent<ItemComponent>(entity) ||
-                   _entMan.HasComponent<SharedBodyComponent>(entity);
+                   _entMan.HasComponent<BodyComponent>(entity);
         }
 
         public bool TryInsert(EntityUid entity)

Content.Server/Drone/DroneSystem.cs

@@ -1,23 +1,24 @@
-using Content.Shared.Drone;
+using Content.Server.Body.Systems;
 using Content.Server.Drone.Components;
-using Content.Shared.MobState;
-using Content.Shared.MobState.Components;
-using Content.Shared.Interaction.Events;
-using Content.Shared.Interaction.Components;
-using Content.Shared.Examine;
-using Content.Shared.Tag;
-using Content.Shared.Throwing;
-using Content.Shared.Item;
-using Content.Shared.Emoting;
-using Content.Shared.Body.Components;
-using Content.Shared.IdentityManagement;
-using Content.Shared.Popups;
-using Content.Server.Popups;
-using Content.Server.Mind.Components;
 using Content.Server.Ghost.Components;
 using Content.Server.Ghost.Roles.Components;
+using Content.Server.Mind.Components;
+using Content.Server.Popups;
 using Content.Server.Tools.Innate;
 using Content.Server.UserInterface;
+using Content.Shared.Body.Components;
+using Content.Shared.Drone;
+using Content.Shared.Emoting;
+using Content.Shared.Examine;
+using Content.Shared.IdentityManagement;
+using Content.Shared.Interaction.Components;
+using Content.Shared.Interaction.Events;
+using Content.Shared.Item;
+using Content.Shared.MobState;
+using Content.Shared.MobState.Components;
+using Content.Shared.Popups;
+using Content.Shared.Tag;
+using Content.Shared.Throwing;
 using Robust.Shared.Player;
 using Robust.Shared.Timing;
 
@@ -25,6 +26,7 @@ namespace Content.Server.Drone
 {
     public sealed class DroneSystem : SharedDroneSystem
     {
+        [Dependency] private readonly BodySystem _bodySystem = default!;
         [Dependency] private readonly PopupSystem _popupSystem = default!;
         [Dependency] private readonly TagSystem _tagSystem = default!;
         [Dependency] private readonly EntityLookupSystem _lookup = default!;
@@ -83,8 +85,8 @@ namespace Content.Server.Drone
                 if (TryComp<InnateToolComponent>(uid, out var innate))
                     _innateToolSystem.Cleanup(uid, innate);
 
-                if (TryComp<SharedBodyComponent>(uid, out var body))
-                    body.Gib();
+                if (TryComp<BodyComponent>(uid, out var body))
+                    _bodySystem.GibBody(uid, body: body);
                 Del(uid);
             }
         }

Content.Server/ImmovableRod/ImmovableRodSystem.cs

@@ -1,11 +1,11 @@
-using Content.Server.Body.Components;
+using Content.Server.Body.Systems;
 using Content.Server.Popups;
+using Content.Shared.Body.Components;
 using Content.Shared.Examine;
 using Content.Shared.Popups;
 using Robust.Shared.Audio;
 using Robust.Shared.Map;
 using Robust.Shared.Physics.Components;
-using Robust.Shared.Physics.Dynamics;
 using Robust.Shared.Physics.Events;
 using Robust.Shared.Player;
 using Robust.Shared.Random;
@@ -16,6 +16,8 @@ public sealed class ImmovableRodSystem : EntitySystem
 {
     [Dependency] private readonly IRobustRandom _random = default!;
     [Dependency] private readonly IMapManager _map = default!;
+
+    [Dependency] private readonly BodySystem _bodySystem = default!;
     [Dependency] private readonly PopupSystem _popup = default!;
 
     public override void Update(float frameTime)
@@ -96,7 +98,7 @@ public sealed class ImmovableRodSystem : EntitySystem
 
             _popup.PopupEntity(Loc.GetString("immovable-rod-penetrated-mob", ("rod", uid), ("mob", ent)), uid,
                 Filter.Pvs(uid), PopupType.LargeCaution);
-            body.Gib();
+            _bodySystem.GibBody(ent, body: body);
         }
 
         QueueDel(ent);

Content.Server/Kitchen/EntitySystems/MicrowaveSystem.cs

@@ -1,22 +1,22 @@
 using System.Linq;
+using Content.Server.Body.Systems;
 using Content.Server.Chemistry.Components.SolutionManager;
 using Content.Server.Chemistry.EntitySystems;
 using Content.Server.Construction;
-using Content.Server.Kitchen.Components;
-using Content.Shared.Destructible;
-using Content.Shared.Interaction;
-using Content.Shared.Item;
-using Content.Shared.Kitchen.Components;
-using Robust.Shared.Player;
-using Content.Shared.Interaction.Events;
-using Content.Shared.Body.Components;
-using Content.Shared.Body.Part;
 using Content.Server.Hands.Systems;
+using Content.Server.Kitchen.Components;
 using Content.Server.Power.Components;
 using Content.Server.Temperature.Components;
 using Content.Server.Temperature.Systems;
+using Content.Shared.Body.Components;
+using Content.Shared.Body.Part;
+using Content.Shared.Destructible;
 using Content.Shared.FixedPoint;
+using Content.Shared.Interaction;
+using Content.Shared.Interaction.Events;
+using Content.Shared.Item;
 using Content.Shared.Kitchen;
+using Content.Shared.Kitchen.Components;
 using Content.Shared.Popups;
 using Content.Shared.Power;
 using Content.Shared.Tag;
@@ -24,11 +24,13 @@ using Robust.Server.Containers;
 using Robust.Server.GameObjects;
 using Robust.Shared.Audio;
 using Robust.Shared.Containers;
+using Robust.Shared.Player;
 
 namespace Content.Server.Kitchen.EntitySystems
 {
     public sealed class MicrowaveSystem : EntitySystem
     {
+        [Dependency] private readonly BodySystem _bodySystem = default!;
         [Dependency] private readonly ContainerSystem _container = default!;
         [Dependency] private readonly SharedPopupSystem _popupSystem = default!;
         [Dependency] private readonly RecipeManager _recipeManager = default!;
@@ -182,29 +184,19 @@ namespace Content.Server.Kitchen.EntitySystems
             var victim = args.Victim;
             var headCount = 0;
 
-            if (TryComp<SharedBodyComponent>(victim, out var body))
+            if (TryComp<BodyComponent>(victim, out var body))
             {
-                var headSlots = body.GetSlotsOfType(BodyPartType.Head);
+                var headSlots = _bodySystem.GetBodyChildrenOfType(victim, BodyPartType.Head, body);
 
-                foreach (var slot in headSlots)
+                foreach (var part in headSlots)
                 {
-                    var part = slot.Part;
-
-                    if (part == null ||
-                        !body.TryDropPart(slot, out var dropped))
+                    if (!_bodySystem.OrphanPart(part.Id, part.Component))
                     {
                         continue;
                     }
 
-                    foreach (var droppedPart in dropped.Values)
-                    {
-                        if (droppedPart.PartType != BodyPartType.Head)
-                        {
-                            continue;
-                        }
-                        component.Storage.Insert(droppedPart.Owner);
-                        headCount++;
-                    }
+                    component.Storage.Insert(part.Id);
+                    headCount++;
                 }
             }
 

Content.Server/Kitchen/EntitySystems/SharpSystem.cs

@@ -1,4 +1,5 @@
-using Content.Server.DoAfter;
+using Content.Server.Body.Systems;
+using Content.Server.DoAfter;
 using Content.Server.Kitchen.Components;
 using Content.Server.MobState;
 using Content.Shared.Body.Components;
@@ -16,6 +17,7 @@ namespace Content.Server.Kitchen.EntitySystems;
 
 public sealed class SharpSystem : EntitySystem
 {
+    [Dependency] private readonly BodySystem _bodySystem = default!;
     [Dependency] private readonly DoAfterSystem _doAfterSystem = default!;
     [Dependency] private readonly SharedPopupSystem _popupSystem = default!;
     [Dependency] private readonly ContainerSystem _containerSystem = default!;
@@ -95,7 +97,7 @@ public sealed class SharpSystem : EntitySystem
             popupEnt = Spawn(proto, coords.Offset(_robustRandom.NextVector2(0.25f)));
         }
 
-        var hasBody = TryComp<SharedBodyComponent>(ev.Entity, out var body);
+        var hasBody = TryComp<BodyComponent>(ev.Entity, out var body);
 
         // only show a big popup when butchering living things.
         var popupType = PopupType.Small;
@@ -107,7 +109,7 @@ public sealed class SharpSystem : EntitySystem
 
         if (hasBody)
         {
-            body!.Gib();
+            _bodySystem.GibBody(body!.Owner, body: body);
         }
         else
         {

Content.Server/Magic/MagicSystem.cs

@@ -1,12 +1,10 @@
 using System.Threading;
 using Content.Server.Body.Components;
+using Content.Server.Body.Systems;
 using Content.Server.Coordinates.Helpers;
-using Content.Server.Decals;
 using Content.Server.DoAfter;
 using Content.Server.Doors.Components;
 using Content.Server.Magic.Events;
-using Content.Server.Popups;
-using Content.Server.Spawners.Components;
 using Content.Server.Weapons.Ranged.Systems;
 using Content.Shared.Actions;
 using Content.Shared.Actions.ActionTypes;
@@ -35,6 +33,7 @@ public sealed class MagicSystem : EntitySystem
     [Dependency] private readonly IMapManager _mapManager = default!;
     [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
     [Dependency] private readonly IRobustRandom _random = default!;
+    [Dependency] private readonly BodySystem _bodySystem = default!;
     [Dependency] private readonly EntityLookupSystem _lookup = default!;
     [Dependency] private readonly SharedDoorSystem _doorSystem = default!;
     [Dependency] private readonly SharedActionsSystem _actionsSystem = default!;
@@ -281,7 +280,7 @@ public sealed class MagicSystem : EntitySystem
         if (!TryComp<BodyComponent>(ev.Target, out var body))
             return;
 
-        var ents = body.Gib(true);
+        var ents = _bodySystem.GibBody(ev.Target, true, body);
 
         if (!ev.DeleteNonBrainParts)
             return;
@@ -289,8 +288,7 @@ public sealed class MagicSystem : EntitySystem
         foreach (var part in ents)
         {
             // just leaves a brain and clothes
-            if ((HasComp<BodyPartComponent>(part) || HasComp<MechanismComponent>(part))
-                && !HasComp<BrainComponent>(part))
+            if (HasComp<BodyComponent>(part) && !HasComp<BrainComponent>(part))
             {
                 QueueDel(part);
             }

Content.Server/Medical/VomitSystem.cs

@@ -1,16 +1,16 @@
-using Content.Server.Nutrition.Components;
-using Content.Server.Stunnable;
-using Content.Server.Nutrition.EntitySystems;
 using Content.Server.Body.Components;
-using Content.Server.Fluids.Components;
-using Content.Server.Chemistry.EntitySystems;
-using Content.Server.Popups;
 using Content.Server.Body.Systems;
-using Content.Shared.StatusEffect;
+using Content.Server.Chemistry.EntitySystems;
+using Content.Server.Fluids.Components;
+using Content.Server.Nutrition.Components;
+using Content.Server.Nutrition.EntitySystems;
+using Content.Server.Popups;
+using Content.Server.Stunnable;
 using Content.Shared.Audio;
+using Content.Shared.IdentityManagement;
+using Content.Shared.StatusEffect;
 using Robust.Shared.Audio;
 using Robust.Shared.Player;
-using Content.Shared.IdentityManagement;
 
 namespace Content.Server.Medical
 {
@@ -29,7 +29,7 @@ namespace Content.Server.Medical
         public void Vomit(EntityUid uid, float thirstAdded = -40f, float hungerAdded = -40f)
         {
             /// Main requirement: You have a stomach
-            var stomachList = _bodySystem.GetComponentsOnMechanisms<StomachComponent>(uid);
+            var stomachList = _bodySystem.GetBodyOrganComponents<StomachComponent>(uid);
             if (stomachList.Count == 0)
             {
                 return;

Content.Server/Morgue/EntityStorageLayingDownOverrideSystem.cs

@@ -1,13 +1,15 @@
+using Content.Server.Body.Systems;
 using Content.Server.Morgue.Components;
-using Content.Shared.Standing;
 using Content.Server.Storage.Components;
 using Content.Shared.Body.Components;
+using Content.Shared.Standing;
 
 namespace Content.Server.Morgue;
 
 public sealed class EntityStorageLayingDownOverrideSystem : EntitySystem
 {
     [Dependency] private readonly StandingStateSystem _standing = default!;
+    [Dependency] private readonly BodySystem _body = default!;
 
     public override void Initialize()
     {
@@ -16,10 +18,11 @@ public sealed class EntityStorageLayingDownOverrideSystem : EntitySystem
         SubscribeLocalEvent<EntityStorageLayingDownOverrideComponent, StorageBeforeCloseEvent>(OnBeforeClose);
     }
 
-    private void OnBeforeClose(EntityUid uid, EntityStorageLayingDownOverrideComponent component, StorageBeforeCloseEvent args)
+    private void OnBeforeClose(EntityUid uid, EntityStorageLayingDownOverrideComponent component,
+        StorageBeforeCloseEvent args)
     {
         foreach (var ent in args.Contents)
-            if (HasComp<SharedBodyComponent>(ent) && !_standing.IsDown(ent))
+            if (HasComp<BodyComponent>(ent) && !_standing.IsDown(ent))
                 args.Contents.Remove(ent);
     }
 }

Content.Server/Morgue/MorgueSystem.cs

@@ -1,9 +1,9 @@
 using Content.Server.Morgue.Components;
-using Content.Shared.Morgue;
-using Content.Shared.Examine;
-using Robust.Server.GameObjects;
 using Content.Server.Storage.Components;
 using Content.Shared.Body.Components;
+using Content.Shared.Examine;
+using Content.Shared.Morgue;
+using Robust.Server.GameObjects;
 
 namespace Content.Server.Morgue;
 
@@ -61,7 +61,7 @@ public sealed class MorgueSystem : EntitySystem
 
         foreach (var ent in storage.Contents.ContainedEntities)
         {
-            if (!hasMob && HasComp<SharedBodyComponent>(ent))
+            if (!hasMob && HasComp<BodyComponent>(ent))
                 hasMob = true;
 
             if (HasComp<ActorComponent?>(ent))

Content.Server/Nutrition/EntitySystems/DrinkSystem.cs

@@ -55,7 +55,7 @@ namespace Content.Server.Nutrition.EntitySystems
             SubscribeLocalEvent<DrinkComponent, GetVerbsEvent<AlternativeVerb>>(AddDrinkVerb);
             SubscribeLocalEvent<DrinkComponent, ExaminedEvent>(OnExamined);
             SubscribeLocalEvent<DrinkComponent, SolutionTransferAttemptEvent>(OnTransferAttempt);
-            SubscribeLocalEvent<SharedBodyComponent, DrinkEvent>(OnDrink);
+            SubscribeLocalEvent<BodyComponent, DrinkEvent>(OnDrink);
             SubscribeLocalEvent<DrinkCancelledEvent>(OnDrinkCancelled);
         }
 
@@ -225,7 +225,7 @@ namespace Content.Server.Nutrition.EntitySystems
                 return true;
             }
 
-            if (!EntityManager.HasComponent<SharedBodyComponent>(target))
+            if (!EntityManager.HasComponent<BodyComponent>(target))
                 return false;
 
             if (!drink.Opened)
@@ -286,7 +286,7 @@ namespace Content.Server.Nutrition.EntitySystems
         /// <summary>
         ///     Raised directed at a victim when someone has force fed them a drink.
         /// </summary>
-        private void OnDrink(EntityUid uid, SharedBodyComponent body, DrinkEvent args)
+        private void OnDrink(EntityUid uid, BodyComponent body, DrinkEvent args)
         {
             if (args.Drink.Deleted)
                 return;
@@ -297,7 +297,7 @@ namespace Content.Server.Nutrition.EntitySystems
 
             var forceDrink = uid != args.User;
 
-            if (!_bodySystem.TryGetComponentsOnMechanisms<StomachComponent>(uid, out var stomachs, body))
+            if (!_bodySystem.TryGetBodyOrganComponents<StomachComponent>(uid, out var stomachs, body))
             {
                 _popupSystem.PopupEntity(
                     forceDrink ?
@@ -380,8 +380,8 @@ namespace Content.Server.Nutrition.EntitySystems
             if (uid == ev.User ||
                 !ev.CanInteract ||
                 !ev.CanAccess ||
-                !EntityManager.TryGetComponent(ev.User, out SharedBodyComponent? body) ||
-                !_bodySystem.TryGetComponentsOnMechanisms<StomachComponent>(ev.User, out var stomachs, body))
+                !EntityManager.TryGetComponent(ev.User, out BodyComponent? body) ||
+                !_bodySystem.TryGetBodyOrganComponents<StomachComponent>(ev.User, out var stomachs, body))
                 return;
 
             if (EntityManager.TryGetComponent<MobStateComponent>(uid, out var mobState) && mobState.IsAlive())

Content.Server/Nutrition/EntitySystems/FoodSystem.cs

@@ -1,3 +1,4 @@
+using System.Threading;
 using Content.Server.Body.Components;
 using Content.Server.Body.Systems;
 using Content.Server.Chemistry.EntitySystems;
@@ -20,7 +21,6 @@ using Content.Shared.Verbs;
 using Robust.Shared.Audio;
 using Robust.Shared.Player;
 using Robust.Shared.Utility;
-using System.Threading;
 
 namespace Content.Server.Nutrition.EntitySystems
 {
@@ -48,7 +48,7 @@ namespace Content.Server.Nutrition.EntitySystems
             SubscribeLocalEvent<FoodComponent, UseInHandEvent>(OnUseFoodInHand);
             SubscribeLocalEvent<FoodComponent, AfterInteractEvent>(OnFeedFood);
             SubscribeLocalEvent<FoodComponent, GetVerbsEvent<AlternativeVerb>>(AddEatVerb);
-            SubscribeLocalEvent<SharedBodyComponent, FeedEvent>(OnFeed);
+            SubscribeLocalEvent<BodyComponent, FeedEvent>(OnFeed);
             SubscribeLocalEvent<ForceFeedCancelledEvent>(OnFeedCancelled);
             SubscribeLocalEvent<InventoryComponent, IngestionAttemptEvent>(OnInventoryIngestAttempt);
         }
@@ -88,7 +88,7 @@ namespace Content.Server.Nutrition.EntitySystems
                 return false;
 
             // Target can't be fed
-            if (!EntityManager.HasComponent<SharedBodyComponent>(target))
+            if (!EntityManager.HasComponent<BodyComponent>(target))
                 return false;
 
             if (!_solutionContainerSystem.TryGetSolution(food.Owner, food.SolutionName, out var foodSolution))
@@ -145,14 +145,14 @@ namespace Content.Server.Nutrition.EntitySystems
 
         }
 
-        private void OnFeed(EntityUid uid, SharedBodyComponent body, FeedEvent args)
+        private void OnFeed(EntityUid uid, BodyComponent body, FeedEvent args)
         {
             if (args.Food.Deleted)
                 return;
 
             args.Food.CancelToken = null;
 
-            if (!_bodySystem.TryGetComponentsOnMechanisms<StomachComponent>(uid, out var stomachs, body))
+            if (!_bodySystem.TryGetBodyOrganComponents<StomachComponent>(uid, out var stomachs, body))
                 return;
 
             var transferAmount = args.Food.TransferAmount != null
@@ -243,8 +243,8 @@ namespace Content.Server.Nutrition.EntitySystems
             if (uid == ev.User ||
                 !ev.CanInteract ||
                 !ev.CanAccess ||
-                !EntityManager.TryGetComponent(ev.User, out SharedBodyComponent? body) ||
-                !_bodySystem.TryGetComponentsOnMechanisms<StomachComponent>(ev.User, out var stomachs, body))
+                !EntityManager.TryGetComponent(ev.User, out BodyComponent? body) ||
+                !_bodySystem.TryGetBodyOrganComponents<StomachComponent>(ev.User, out var stomachs, body))
                 return;
 
             if (EntityManager.TryGetComponent<MobStateComponent>(uid, out var mobState) && mobState.IsAlive())
@@ -279,7 +279,7 @@ namespace Content.Server.Nutrition.EntitySystems
             if (!_solutionContainerSystem.TryGetSolution(uid, food.SolutionName, out var foodSolution))
                 return;
 
-            if (!_bodySystem.TryGetComponentsOnMechanisms<StomachComponent>(target, out var stomachs, body))
+            if (!_bodySystem.TryGetBodyOrganComponents<StomachComponent>(target, out var stomachs, body))
                 return;
 
             if (food.UsesRemaining <= 0)

Content.Server/Recycling/RecyclerSystem.cs

@@ -1,8 +1,8 @@
 using Content.Server.Audio;
+using Content.Server.Body.Systems;
 using Content.Server.GameTicking;
 using Content.Server.Players;
 using Content.Server.Popups;
-using Content.Server.Power.Components;
 using Content.Server.Power.EntitySystems;
 using Content.Server.Recycling.Components;
 using Content.Shared.Audio;
@@ -14,7 +14,6 @@ using Content.Shared.Recycling;
 using Content.Shared.Tag;
 using Robust.Server.GameObjects;
 using Robust.Shared.Audio;
-using Robust.Shared.Physics.Dynamics;
 using Robust.Shared.Physics.Events;
 using Robust.Shared.Player;
 using Robust.Shared.Timing;
@@ -25,6 +24,7 @@ namespace Content.Server.Recycling
     {
         [Dependency] private readonly IGameTiming _timing = default!;
         [Dependency] private readonly AmbientSoundSystem _ambience = default!;
+        [Dependency] private readonly BodySystem _bodySystem = default!;
         [Dependency] private readonly GameTicker _ticker = default!;
         [Dependency] private readonly PopupSystem _popup = default!;
         [Dependency] private readonly TagSystem _tags = default!;
@@ -57,9 +57,9 @@ namespace Content.Server.Recycling
                 victim,
                 Filter.Pvs(victim, entityManager: EntityManager).RemoveWhereAttachedEntity(e => e == victim));
 
-            if (TryComp<SharedBodyComponent?>(victim, out var body))
+            if (TryComp<BodyComponent?>(victim, out var body))
             {
-                body.Gib(true);
+                _bodySystem.GibBody(victim, true, body);
             }
 
             Bloodstain(component);
@@ -104,7 +104,7 @@ namespace Content.Server.Recycling
             // Mobs are a special case!
             if (CanGib(component, entity))
             {
-                Comp<SharedBodyComponent>(entity).Gib(true);
+                _bodySystem.GibBody(entity, true, Comp<BodyComponent>(entity));
                 Bloodstain(component);
                 return;
             }
@@ -123,7 +123,7 @@ namespace Content.Server.Recycling
 
         private bool CanGib(RecyclerComponent component, EntityUid entity)
         {
-            return HasComp<SharedBodyComponent>(entity) && !component.Safe &&
+            return HasComp<BodyComponent>(entity) && !component.Safe &&
                    this.IsPowered(component.Owner, EntityManager);
         }
 

Content.Server/Salvage/SalvageMobRestrictionsSystem.cs

@@ -1,13 +1,16 @@
-using Content.Shared.Damage;
-using Content.Server.Body.Components;
+using Content.Server.Body.Systems;
 using Content.Server.MobState;
+using Content.Shared.Body.Components;
+using Content.Shared.Damage;
 
 namespace Content.Server.Salvage;
 
 public sealed class SalvageMobRestrictionsSystem : EntitySystem
 {
+    [Dependency] private readonly BodySystem _bodySystem = default!;
     [Dependency] private readonly DamageableSystem _damageableSystem = default!;
     [Dependency] private readonly MobStateSystem _mobStateSystem = default!;
+
     public override void Initialize()
     {
         base.Initialize();
@@ -55,7 +58,7 @@ public sealed class SalvageMobRestrictionsSystem : EntitySystem
             if (bodyQuery.TryGetComponent(target, out var body))
             {
                 // Just because.
-                body.Gib();
+                _bodySystem.GibBody(target, body: body);
             }
             else if (damageQuery.TryGetComponent(target, out var damageableComponent))
             {

Content.Server/Storage/EntitySystems/EntityStorageSystem.cs

@@ -326,7 +326,7 @@ public sealed class EntityStorageSystem : EntitySystem
         if (attemptEvent.Cancelled)
             return false;
 
-        var targetIsMob = HasComp<SharedBodyComponent>(toInsert);
+        var targetIsMob = HasComp<BodyComponent>(toInsert);
         var storageIsItem = HasComp<ItemComponent>(container);
         var allowedToEat = whitelist?.IsValid(toInsert) ?? HasComp<ItemComponent>(toInsert);
 

Content.Server/Toilet/ToiletSystem.cs

@@ -1,3 +1,4 @@
+using Content.Server.Body.Systems;
 using Content.Server.Buckle.Components;
 using Content.Server.Buckle.Systems;
 using Content.Server.Popups;
@@ -24,6 +25,7 @@ namespace Content.Server.Toilet
     {
         [Dependency] private readonly IRobustRandom _random = default!;
         [Dependency] private readonly SharedAppearanceSystem _appearance = default!;
+        [Dependency] private readonly BodySystem _bodySystem = default!;
         [Dependency] private readonly SharedAudioSystem _audio = default!;
         [Dependency] private readonly SecretStashSystem _secretStash = default!;
         [Dependency] private readonly PopupSystem _popupSystem = default!;
@@ -48,8 +50,8 @@ namespace Content.Server.Toilet
                 return;
 
             // Check that victim has a head
-            if (EntityManager.TryGetComponent<SharedBodyComponent>(args.Victim, out var body) &&
-                body.HasPartOfType(BodyPartType.Head))
+            if (EntityManager.TryGetComponent<BodyComponent>(args.Victim, out var body) &&
+                _bodySystem.BodyHasChildOfType(args.Victim, BodyPartType.Head, body))
             {
                 var othersMessage = Loc.GetString("toilet-component-suicide-head-message-others",
                     ("victim", Identity.Entity(args.Victim, EntityManager)), ("owner", uid));

Content.Shared/Body/Components/BodyComponent.cs

@@ -0,0 +1,36 @@
+using Content.Shared.Body.Part;
+using Content.Shared.Body.Prototypes;
+using Content.Shared.Body.Systems;
+using Content.Shared.DragDrop;
+using Robust.Shared.Audio;
+using Robust.Shared.GameStates;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Shared.Body.Components;
+
+[RegisterComponent, NetworkedComponent]
+[Access(typeof(SharedBodySystem))]
+public sealed class BodyComponent : Component, IDraggable
+{
+    [ViewVariables]
+    [DataField("prototype", customTypeSerializer: typeof(PrototypeIdSerializer<BodyPrototype>))]
+    public readonly string? Prototype;
+
+    [ViewVariables]
+    [DataField("root")]
+    public BodyPartSlot Root = default!;
+
+    [ViewVariables]
+    [DataField("gibSound")]
+    public SoundSpecifier GibSound = new SoundCollectionSpecifier("gib");
+
+    bool IDraggable.CanStartDrag(StartDragDropEvent args)
+    {
+        return true;
+    }
+
+    bool IDraggable.CanDrop(CanDropEvent args)
+    {
+        return true;
+    }
+}

Content.Shared/Body/Components/BodyComponentState.cs

@@ -0,0 +1,18 @@
+using Content.Shared.Body.Part;
+using Robust.Shared.Audio;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Body.Components;
+
+[Serializable, NetSerializable]
+public sealed class BodyComponentState : ComponentState
+{
+    public readonly BodyPartSlot Root;
+    public readonly SoundSpecifier GibSound;
+
+    public BodyComponentState(BodyPartSlot root, SoundSpecifier gibSound)
+    {
+        Root = root;
+        GibSound = gibSound;
+    }
+}

Content.Shared/Body/Components/MechanismComponent.cs

@@ -1,78 +0,0 @@
-using Content.Shared.Body.Events;
-using Content.Shared.Body.Part;
-using Robust.Shared.Serialization;
-
-namespace Content.Shared.Body.Components
-{
-    [RegisterComponent]
-    public sealed class MechanismComponent : Component
-    {
-        [Dependency] private readonly IEntityManager _entMan = default!;
-        private SharedBodyPartComponent? _part;
-
-        public SharedBodyComponent? Body => Part?.Body;
-
-        public SharedBodyPartComponent? Part
-        {
-            get => _part;
-            set
-            {
-                if (_part == value)
-                {
-                    return;
-                }
-
-                var old = _part;
-                _part = value;
-
-                if (old != null)
-                {
-                    if (old.Body == null)
-                    {
-                        _entMan.EventBus.RaiseLocalEvent(Owner, new RemovedFromPartEvent(old), true);
-                    }
-                    else
-                    {
-                        _entMan.EventBus.RaiseLocalEvent(Owner, new RemovedFromPartInBodyEvent(old.Body, old), true);
-                    }
-                }
-
-                if (value != null)
-                {
-                    if (value.Body == null)
-                    {
-                        _entMan.EventBus.RaiseLocalEvent(Owner, new AddedToPartEvent(value), true);
-                    }
-                    else
-                    {
-                        _entMan.EventBus.RaiseLocalEvent(Owner, new AddedToPartInBodyEvent(value.Body, value), true);
-                    }
-                }
-            }
-        }
-
-        [DataField("maxDurability")] public int MaxDurability { get; set; } = 10;
-
-        [DataField("currentDurability")] public int CurrentDurability { get; set; } = 10;
-
-        [DataField("destroyThreshold")] public int DestroyThreshold { get; set; } = -10;
-
-        // TODO BODY: Surgery description and adding a message to the examine tooltip of the entity that owns this mechanism
-        // TODO BODY
-        [DataField("resistance")] public int Resistance { get; set; } = 0;
-
-        // TODO BODY OnSizeChanged
-        /// <summary>
-        ///     Determines whether this
-        ///     <see cref="MechanismComponent"/> can fit into a <see cref="SharedBodyPartComponent"/>.
-        /// </summary>
-        [DataField("size")] public int Size { get; set; } = 1;
-
-        /// <summary>
-        ///     What kind of <see cref="SharedBodyPartComponent"/> this
-        ///     <see cref="MechanismComponent"/> can be easily installed into.
-        /// </summary>
-        [DataField("compatibility")]
-        public BodyPartCompatibility Compatibility { get; set; } = BodyPartCompatibility.Universal;
-    }
-}

Content.Shared/Body/Components/SharedBodyComponent.cs

@@ -1,457 +0,0 @@
-using System.Diagnostics.CodeAnalysis;
-using System.Linq;
-using Content.Shared.Body.Part;
-using Content.Shared.Body.Prototypes;
-using Content.Shared.Damage;
-using Content.Shared.Damage.Prototypes;
-using Content.Shared.Standing;
-using Robust.Shared.GameStates;
-using Robust.Shared.Prototypes;
-using Robust.Shared.Serialization;
-using Robust.Shared.Utility;
-
-namespace Content.Shared.Body.Components
-{
-    // TODO BODY Damage methods for collections of IDamageableComponents
-
-    [NetworkedComponent()]
-    public abstract class SharedBodyComponent : Component, ISerializationHooks
-    {
-        [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
-
-        [ViewVariables]
-        [DataField("template", required: true)]
-        private string? TemplateId { get; }
-
-        [ViewVariables]
-        [DataField("preset", required: true)]
-        private string? PresetId { get; }
-
-        [ViewVariables]
-        public BodyTemplatePrototype? Template => TemplateId == null
-            ? null
-            : _prototypeManager.Index<BodyTemplatePrototype>(TemplateId);
-
-        [ViewVariables]
-        public BodyPresetPrototype? Preset => PresetId == null
-            ? null
-            : _prototypeManager.Index<BodyPresetPrototype>(PresetId);
-
-        [ViewVariables]
-        private Dictionary<string, BodyPartSlot> SlotIds { get; } = new();
-
-        [ViewVariables]
-        private Dictionary<SharedBodyPartComponent, BodyPartSlot> SlotParts { get; } = new();
-
-        [ViewVariables]
-        public IEnumerable<BodyPartSlot> Slots => SlotIds.Values;
-
-        [ViewVariables]
-        public IEnumerable<KeyValuePair<SharedBodyPartComponent, BodyPartSlot>> Parts => SlotParts;
-
-        public BodyPartSlot? CenterSlot =>
-            Template?.CenterSlot is { } centerSlot
-                ? SlotIds.GetValueOrDefault(centerSlot)
-                : null;
-
-        public SharedBodyPartComponent? CenterPart => CenterSlot?.Part;
-
-        protected override void Initialize()
-        {
-            base.Initialize();
-
-            // TODO BODY BeforeDeserialization
-            // TODO BODY Move to template or somewhere else
-            if (TemplateId != null)
-            {
-                var template = _prototypeManager.Index<BodyTemplatePrototype>(TemplateId);
-
-                foreach (var (id, partType) in template.Slots)
-                {
-                    SetSlot(id, partType);
-                }
-
-                foreach (var (slotId, connectionIds) in template.Connections)
-                {
-                    var connections = connectionIds.Select(id => SlotIds[id]);
-                    SlotIds[slotId].SetConnectionsInternal(connections);
-                }
-            }
-        }
-
-        protected override void OnRemove()
-        {
-            foreach (var slot in SlotIds.Values)
-            {
-                slot.Shutdown();
-            }
-
-            base.OnRemove();
-        }
-
-        private BodyPartSlot SetSlot(string id, BodyPartType type)
-        {
-            var slot = new BodyPartSlot(id, type);
-
-            SlotIds[id] = slot;
-            slot.PartAdded += part => OnAddPart(slot, part);
-            slot.PartRemoved += part => OnRemovePart(slot, part);
-
-            return slot;
-        }
-
-        private Dictionary<BodyPartSlot, SharedBodyPartComponent> GetHangingParts(BodyPartSlot from)
-        {
-            var hanging = new Dictionary<BodyPartSlot, SharedBodyPartComponent>();
-
-            foreach (var connection in from.Connections)
-            {
-                if (connection.Part != null &&
-                    !ConnectedToCenter(connection.Part))
-                {
-                    hanging.Add(connection, connection.Part);
-                }
-            }
-
-            return hanging;
-        }
-
-        protected virtual bool CanAddPart(string slotId, SharedBodyPartComponent part)
-        {
-            if (!SlotIds.TryGetValue(slotId, out var slot) ||
-                slot.CanAddPart(part))
-            {
-                return false;
-            }
-
-            return true;
-        }
-
-        protected virtual void OnAddPart(BodyPartSlot slot, SharedBodyPartComponent part)
-        {
-            SlotParts[part] = slot;
-            part.Body = this;
-
-            var argsAdded = new BodyPartAddedEventArgs(slot.Id, part);
-
-            // TODO: Body refactor. Somebody is doing it
-            // EntitySystem.Get<SharedHumanoidAppearanceSystem>().BodyPartAdded(Owner, argsAdded);
-            foreach (var component in IoCManager.Resolve<IEntityManager>().GetComponents<IBodyPartAdded>(Owner).ToArray())
-            {
-                component.BodyPartAdded(argsAdded);
-            }
-
-            // TODO BODY Sort this duplicate out
-            OnBodyChanged();
-        }
-
-        protected virtual void OnRemovePart(BodyPartSlot slot, SharedBodyPartComponent part)
-        {
-            SlotParts.Remove(part);
-
-            foreach (var connectedSlot in slot.Connections)
-            {
-                if (connectedSlot.Part != null &&
-                    !ConnectedToCenter(connectedSlot.Part))
-                {
-                    RemovePart(connectedSlot.Part);
-                }
-            }
-
-            part.Body = null;
-
-            var args = new BodyPartRemovedEventArgs(slot.Id, part);
-
-
-            // TODO: Body refactor. Somebody is doing it
-            // EntitySystem.Get<SharedHumanoidAppearanceSystem>().BodyPartRemoved(Owner, args);
-            foreach (var component in IoCManager.Resolve<IEntityManager>().GetComponents<IBodyPartRemoved>(Owner))
-            {
-                component.BodyPartRemoved(args);
-            }
-
-            // creadth: fall down if no legs
-            if (part.PartType == BodyPartType.Leg &&
-                GetPartsOfType(BodyPartType.Leg).ToArray().Length == 0)
-            {
-                EntitySystem.Get<StandingStateSystem>().Down(Owner);
-            }
-
-            if (part.IsVital && SlotParts.Count(x => x.Value.PartType == part.PartType) == 0)
-            {
-                // TODO BODY SYSTEM KILL : Find a more elegant way of killing em than just dumping bloodloss damage.
-                var damage = new DamageSpecifier(_prototypeManager.Index<DamageTypePrototype>("Bloodloss"), 300);
-                EntitySystem.Get<DamageableSystem>().TryChangeDamage(part.Owner, damage);
-            }
-
-            OnBodyChanged();
-        }
-
-        // TODO BODY Sensible templates
-        public bool TryAddPart(string slotId, SharedBodyPartComponent part)
-        {
-            DebugTools.AssertNotNull(part);
-            DebugTools.AssertNotNull(slotId);
-
-            if (!CanAddPart(slotId, part))
-            {
-                return false;
-            }
-
-            return SlotIds.TryGetValue(slotId, out var slot) &&
-                   slot.TryAddPart(part);
-        }
-
-        public void SetPart(string slotId, SharedBodyPartComponent part)
-        {
-            if (!SlotIds.TryGetValue(slotId, out var slot))
-            {
-                slot = SetSlot(slotId, part.PartType);
-                SlotIds[slotId] = slot;
-            }
-
-            slot.SetPart(part);
-        }
-
-        public bool HasPart(SharedBodyPartComponent part)
-        {
-            DebugTools.AssertNotNull(part);
-
-            return SlotParts.ContainsKey(part);
-        }
-
-        public bool RemovePart(SharedBodyPartComponent part)
-        {
-            DebugTools.AssertNotNull(part);
-
-            return SlotParts.TryGetValue(part, out var slot) &&
-                   slot.RemovePart();
-        }
-
-        public bool TryDropPart(BodyPartSlot slot, [NotNullWhen(true)] out Dictionary<BodyPartSlot, SharedBodyPartComponent>? dropped)
-        {
-            DebugTools.AssertNotNull(slot);
-
-            if (!SlotIds.TryGetValue(slot.Id, out var ownedSlot) ||
-                ownedSlot != slot ||
-                slot.Part == null)
-            {
-                dropped = null;
-                return false;
-            }
-
-            var oldPart = slot.Part;
-            dropped = GetHangingParts(slot);
-
-            if (!slot.RemovePart())
-            {
-                dropped = null;
-                return false;
-            }
-
-            dropped[slot] = oldPart;
-            return true;
-        }
-
-        public bool ConnectedToCenter(SharedBodyPartComponent part)
-        {
-            return TryGetSlot(part, out var result) &&
-                   ConnectedToCenterPartRecursion(result);
-        }
-
-        private bool ConnectedToCenterPartRecursion(BodyPartSlot slot, HashSet<BodyPartSlot>? searched = null)
-        {
-            searched ??= new HashSet<BodyPartSlot>();
-
-            if (Template?.CenterSlot == null)
-            {
-                return false;
-            }
-
-            if (slot.Part == CenterPart)
-            {
-                return true;
-            }
-
-            searched.Add(slot);
-
-            foreach (var connection in slot.Connections)
-            {
-                if (!searched.Contains(connection) &&
-                    ConnectedToCenterPartRecursion(connection, searched))
-                {
-                    return true;
-                }
-            }
-
-            return false;
-        }
-
-        public BodyPartSlot? GetSlot(SharedBodyPartComponent part)
-        {
-            return SlotParts.GetValueOrDefault(part);
-        }
-
-        public bool TryGetSlot(SharedBodyPartComponent part, [NotNullWhen(true)] out BodyPartSlot? slot)
-        {
-            return (slot = GetSlot(part)) != null;
-        }
-
-        public IEnumerable<BodyPartSlot> GetSlotsOfType(BodyPartType type)
-        {
-            foreach (var slot in SlotIds.Values)
-            {
-                if (slot.PartType == type)
-                {
-                    yield return slot;
-                }
-            }
-        }
-
-        public bool HasPartOfType(BodyPartType type)
-        {
-            foreach (var _ in GetPartsOfType(type))
-            {
-                return true;
-            }
-
-            return false;
-        }
-
-        public IEnumerable<SharedBodyPartComponent> GetPartsOfType(BodyPartType type)
-        {
-            foreach (var slot in GetSlotsOfType(type))
-            {
-                if (slot.Part != null)
-                {
-                    yield return slot.Part;
-                }
-            }
-        }
-
-        private void OnBodyChanged()
-        {
-            Dirty();
-        }
-
-        // TODO BODY optimize this
-        public BodyPartSlot SlotAt(int index)
-        {
-            return SlotIds.Values.ElementAt(index);
-        }
-
-        public KeyValuePair<SharedBodyPartComponent, BodyPartSlot> PartAt(int index)
-        {
-            return SlotParts.ElementAt(index);
-        }
-
-        public override ComponentState GetComponentState()
-        {
-            var parts = new (string slot, EntityUid partId)[SlotParts.Count];
-
-            var i = 0;
-            foreach (var (part, slot) in SlotParts)
-            {
-                parts[i] = (slot.Id, part.Owner);
-                i++;
-            }
-
-            return new BodyComponentState(parts);
-        }
-
-        public override void HandleComponentState(ComponentState? curState, ComponentState? nextState)
-        {
-            base.HandleComponentState(curState, nextState);
-
-            if (curState is not BodyComponentState state)
-            {
-                return;
-            }
-
-            var newParts = state.Parts();
-
-            foreach (var (oldPart, slot) in SlotParts)
-            {
-                if (!newParts.TryGetValue(slot.Id, out var newPart) ||
-                    newPart != oldPart)
-                {
-                    RemovePart(oldPart);
-                }
-            }
-
-            foreach (var (slotId, newPart) in newParts)
-            {
-                if (!SlotIds.TryGetValue(slotId, out var slot) ||
-                    slot.Part != newPart)
-                {
-                    SetPart(slotId, newPart);
-                }
-            }
-        }
-
-        public virtual HashSet<EntityUid> Gib(bool gibParts = false)
-        {
-            var entMgr = IoCManager.Resolve<IEntityManager>();
-            var metaQuery = entMgr.GetEntityQuery<MetaDataComponent>();
-            var gibs = new HashSet<EntityUid>();
-            foreach (var part in SlotParts.Keys)
-            {
-                if (!metaQuery.TryGetComponent(part.Owner, out var meta) ||
-                    meta.EntityLifeStage >= EntityLifeStage.Terminating)
-                {
-                    SlotParts.Remove(part);
-                    continue;
-                }
-                gibs.Add(part.Owner);
-                RemovePart(part);
-
-                if (gibParts)
-                    gibs.UnionWith(part.Gib());
-            }
-
-            return gibs;
-        }
-    }
-
-    [Serializable, NetSerializable]
-    public sealed class BodyComponentState : ComponentState
-    {
-        private Dictionary<string, SharedBodyPartComponent>? _parts;
-
-        public readonly (string slot, EntityUid partId)[] PartIds;
-
-        public BodyComponentState((string slot, EntityUid partId)[] partIds)
-        {
-            PartIds = partIds;
-        }
-
-        public Dictionary<string, SharedBodyPartComponent> Parts(IEntityManager? entityManager = null)
-        {
-            if (_parts != null)
-            {
-                return _parts;
-            }
-
-            entityManager ??= IoCManager.Resolve<IEntityManager>();
-
-            var parts = new Dictionary<string, SharedBodyPartComponent>(PartIds.Length);
-
-            foreach (var (slot, partId) in PartIds)
-            {
-                if (!entityManager.EntityExists(partId))
-                {
-                    continue;
-                }
-
-                if (!entityManager.TryGetComponent(partId, out SharedBodyPartComponent? part))
-                {
-                    continue;
-                }
-
-                parts[slot] = part;
-            }
-
-            return _parts = parts;
-        }
-    }
-}

Content.Shared/Body/Components/SharedBodyPartComponent.cs

@@ -1,345 +0,0 @@
-using System.Linq;
-using Content.Shared.Body.Events;
-using Content.Shared.Body.Part;
-using Robust.Shared.GameStates;
-using Robust.Shared.Map;
-using Robust.Shared.Serialization;
-using Robust.Shared.Utility;
-
-namespace Content.Shared.Body.Components
-{
-    [NetworkedComponent()]
-    public abstract class SharedBodyPartComponent : Component
-    {
-        public const string ContainerId = "bodypart";
-
-        [Dependency] private readonly IEntityManager _entMan = default!;
-        private SharedBodyComponent? _body;
-
-        // TODO BODY Remove
-        [DataField("mechanisms")]
-        private readonly List<string> _mechanismIds = new();
-        public IReadOnlyList<string> MechanismIds => _mechanismIds;
-
-        [ViewVariables]
-        private readonly HashSet<MechanismComponent> _mechanisms = new();
-
-        [ViewVariables]
-        public SharedBodyComponent? Body
-        {
-            get => _body;
-            set
-            {
-                if (_body == value)
-                {
-                    return;
-                }
-
-                var old = _body;
-                _body = value;
-
-                if (old != null)
-                {
-                    RemovedFromBody(old);
-                }
-
-                if (value != null)
-                {
-                    AddedToBody(value);
-                }
-            }
-        }
-
-        /// <summary>
-        ///     <see cref="BodyPartType"/> that this <see cref="IBodyPart"/> is considered
-        ///     to be.
-        ///     For example, <see cref="BodyPartType.Arm"/>.
-        /// </summary>
-        [ViewVariables]
-        [DataField("partType")]
-        public BodyPartType PartType { get; private set; } = BodyPartType.Other;
-
-        /// <summary>
-        ///     Determines how many mechanisms can be fit inside this
-        ///     <see cref="SharedBodyPartComponent"/>.
-        /// </summary>
-        [ViewVariables] [DataField("size")] public int Size { get; private set; } = 1;
-
-        [ViewVariables] public int SizeUsed { get; private set; }
-
-        // TODO BODY size used
-        // TODO BODY surgerydata
-
-        /// <summary>
-        ///     What types of BodyParts this <see cref="SharedBodyPartComponent"/> can easily attach to.
-        ///     For the most part, most limbs aren't universal and require extra work to
-        ///     attach between types.
-        /// </summary>
-        [ViewVariables]
-        [DataField("compatibility")]
-        public BodyPartCompatibility Compatibility = BodyPartCompatibility.Universal;
-
-        // TODO BODY Mechanisms occupying different parts at the body level
-        [ViewVariables]
-        public IReadOnlyCollection<MechanismComponent> Mechanisms => _mechanisms;
-
-        // TODO BODY Replace with a simulation of organs
-        /// <summary>
-        ///     Whether or not the owning <see cref="Body"/> will die if all
-        ///     <see cref="SharedBodyPartComponent"/>s of this type are removed from it.
-        /// </summary>
-        [ViewVariables]
-        [DataField("vital")]
-        public bool IsVital = false;
-
-        [ViewVariables]
-        [DataField("symmetry")]
-        public BodyPartSymmetry Symmetry = BodyPartSymmetry.None;
-
-        protected virtual void OnAddMechanism(MechanismComponent mechanism)
-        {
-            var prototypeId = _entMan.GetComponent<MetaDataComponent>(mechanism.Owner).EntityPrototype!.ID;
-
-            if (!_mechanismIds.Contains(prototypeId))
-            {
-                _mechanismIds.Add(prototypeId);
-            }
-
-            mechanism.Part = this;
-            SizeUsed += mechanism.Size;
-
-            Dirty();
-        }
-
-        protected virtual void OnRemoveMechanism(MechanismComponent mechanism)
-        {
-            _mechanismIds.Remove(_entMan.GetComponent<MetaDataComponent>(mechanism.Owner).EntityPrototype!.ID);
-            mechanism.Part = null;
-            SizeUsed -= mechanism.Size;
-
-            Dirty();
-        }
-
-        public override ComponentState GetComponentState()
-        {
-            var mechanismIds = new EntityUid[_mechanisms.Count];
-
-            var i = 0;
-            foreach (var mechanism in _mechanisms)
-            {
-                mechanismIds[i] = mechanism.Owner;
-                i++;
-            }
-
-            return new BodyPartComponentState(mechanismIds);
-        }
-
-        public override void HandleComponentState(ComponentState? curState, ComponentState? nextState)
-        {
-            base.HandleComponentState(curState, nextState);
-
-            if (curState is not BodyPartComponentState state)
-            {
-                return;
-            }
-
-            var newMechanisms = state.Mechanisms();
-
-            foreach (var mechanism in _mechanisms.ToArray())
-            {
-                if (!newMechanisms.Contains(mechanism))
-                {
-                    RemoveMechanism(mechanism);
-                }
-            }
-
-            foreach (var mechanism in newMechanisms)
-            {
-                if (!_mechanisms.Contains(mechanism))
-                {
-                    TryAddMechanism(mechanism, true);
-                }
-            }
-        }
-
-        public virtual bool CanAddMechanism(MechanismComponent mechanism)
-        {
-            return SizeUsed + mechanism.Size <= Size;
-        }
-
-        /// <summary>
-        ///     Tries to add a <see cref="MechanismComponent"/> to this part.
-        /// </summary>
-        /// <param name="mechanism">The mechanism to add.</param>
-        /// <param name="force">
-        ///     Whether or not to check if the mechanism is compatible.
-        ///     Passing true does not guarantee it to be added, for example if
-        ///     it was already added before.
-        /// </param>
-        /// <returns>true if added, false otherwise even if it was already added.</returns>
-        public bool TryAddMechanism(MechanismComponent mechanism, bool force = false)
-        {
-            DebugTools.AssertNotNull(mechanism);
-
-            if (!force && !CanAddMechanism(mechanism))
-            {
-                return false;
-            }
-
-            if (!_mechanisms.Add(mechanism))
-            {
-                return false;
-            }
-
-            OnAddMechanism(mechanism);
-
-            return true;
-        }
-
-        /// <summary>
-        ///     Tries to remove the given <see cref="mechanism"/> from this part.
-        /// </summary>
-        /// <param name="mechanism">The mechanism to remove.</param>
-        /// <returns>True if it was removed, false otherwise.</returns>
-        public bool RemoveMechanism(MechanismComponent mechanism)
-        {
-            DebugTools.AssertNotNull(mechanism);
-
-            if (!_mechanisms.Remove(mechanism))
-            {
-                return false;
-            }
-
-            OnRemoveMechanism(mechanism);
-
-            return true;
-        }
-
-        /// <summary>
-        ///     Tries to remove the given <see cref="mechanism"/> from this
-        ///     part and drops it at the specified coordinates.
-        /// </summary>
-        /// <param name="mechanism">The mechanism to remove.</param>
-        /// <param name="coordinates">The coordinates to drop it at.</param>
-        /// <returns>True if it was removed, false otherwise.</returns>
-        public bool RemoveMechanism(MechanismComponent mechanism, EntityCoordinates coordinates)
-        {
-            if (RemoveMechanism(mechanism))
-            {
-                _entMan.GetComponent<TransformComponent>(mechanism.Owner).Coordinates = coordinates;
-                return true;
-            }
-
-            return false;
-        }
-
-        /// <summary>
-        ///     Tries to destroy the given <see cref="MechanismComponent"/> from
-        ///     this part.
-        ///     The mechanism won't be deleted if it is not in this body part.
-        /// </summary>
-        /// <returns>
-        ///     True if the mechanism was in this body part and destroyed,
-        ///     false otherwise.
-        /// </returns>
-        public bool DeleteMechanism(MechanismComponent mechanism)
-        {
-            DebugTools.AssertNotNull(mechanism);
-
-            if (!RemoveMechanism(mechanism))
-            {
-                return false;
-            }
-
-            _entMan.DeleteEntity(mechanism.Owner);
-            return true;
-        }
-
-        private void AddedToBody(SharedBodyComponent body)
-        {
-            OnAddedToBody(body);
-
-            foreach (var mechanism in _mechanisms)
-            {
-                _entMan.EventBus.RaiseLocalEvent(mechanism.Owner, new AddedToBodyEvent(body), true);
-            }
-        }
-
-        private void RemovedFromBody(SharedBodyComponent old)
-        {
-            if (_entMan.TryGetComponent<TransformComponent>(Owner, out var transformComponent))
-            {
-                transformComponent.AttachToGridOrMap();
-            }
-
-            OnRemovedFromBody(old);
-
-            foreach (var mechanism in _mechanisms)
-            {
-                _entMan.EventBus.RaiseLocalEvent(mechanism.Owner, new RemovedFromBodyEvent(old), true);
-            }
-        }
-
-        protected virtual void OnAddedToBody(SharedBodyComponent body) { }
-
-        protected virtual void OnRemovedFromBody(SharedBodyComponent old) { }
-
-        /// <summary>
-        ///     Gibs the body part.
-        /// </summary>
-        public virtual HashSet<EntityUid> Gib()
-        {
-            var gibs = new HashSet<EntityUid>();
-
-            foreach (var mechanism in _mechanisms.ToArray())
-            {
-                gibs.Add(mechanism.Owner);
-                RemoveMechanism(mechanism);
-            }
-
-            return gibs;
-        }
-    }
-
-    [Serializable, NetSerializable]
-    public sealed class BodyPartComponentState : ComponentState
-    {
-        [NonSerialized] private List<MechanismComponent>? _mechanisms;
-
-        public readonly EntityUid[] MechanismIds;
-
-        public BodyPartComponentState(EntityUid[] mechanismIds)
-        {
-            MechanismIds = mechanismIds;
-        }
-
-        public List<MechanismComponent> Mechanisms(IEntityManager? entityManager = null)
-        {
-            if (_mechanisms != null)
-            {
-                return _mechanisms;
-            }
-
-            IoCManager.Resolve(ref entityManager);
-
-            var mechanisms = new List<MechanismComponent>(MechanismIds.Length);
-
-            foreach (var id in MechanismIds)
-            {
-                if (!entityManager.EntityExists(id))
-                {
-                    continue;
-                }
-
-                if (!entityManager.TryGetComponent(id, out MechanismComponent? mechanism))
-                {
-                    continue;
-                }
-
-                mechanisms.Add(mechanism);
-            }
-
-            return _mechanisms = mechanisms;
-        }
-    }
-}

Content.Shared/Body/Events/MechanismBodyEvents.cs

@@ -1,6 +1,4 @@
-using Content.Shared.Body.Components;
-
-namespace Content.Shared.Body.Events
+namespace Content.Shared.Body.Events
 {
     // All of these events are raised on a mechanism entity when added/removed to a body in different
     // ways.
@@ -10,9 +8,9 @@ namespace Content.Shared.Body.Events
     /// </summary>
     public sealed class AddedToBodyEvent : EntityEventArgs
     {
-        public SharedBodyComponent Body;
+        public EntityUid Body;
 
-        public AddedToBodyEvent(SharedBodyComponent body)
+        public AddedToBodyEvent(EntityUid body)
         {
             Body = body;
         }
@@ -23,9 +21,9 @@ namespace Content.Shared.Body.Events
     /// </summary>
     public sealed class AddedToPartEvent : EntityEventArgs
     {
-        public SharedBodyPartComponent Part;
+        public EntityUid Part;
 
-        public AddedToPartEvent(SharedBodyPartComponent part)
+        public AddedToPartEvent(EntityUid part)
         {
             Part = part;
         }
@@ -36,10 +34,10 @@ namespace Content.Shared.Body.Events
     /// </summary>
     public sealed class AddedToPartInBodyEvent : EntityEventArgs
     {
-        public SharedBodyComponent Body;
-        public SharedBodyPartComponent Part;
+        public EntityUid Body;
+        public EntityUid Part;
 
-        public AddedToPartInBodyEvent(SharedBodyComponent body, SharedBodyPartComponent part)
+        public AddedToPartInBodyEvent(EntityUid body, EntityUid part)
         {
             Body = body;
             Part = part;
@@ -51,9 +49,9 @@ namespace Content.Shared.Body.Events
     /// </summary>
     public sealed class RemovedFromBodyEvent : EntityEventArgs
     {
-        public SharedBodyComponent Old;
+        public EntityUid Old;
 
-        public RemovedFromBodyEvent(SharedBodyComponent old)
+        public RemovedFromBodyEvent(EntityUid old)
         {
             Old = old;
         }
@@ -64,9 +62,9 @@ namespace Content.Shared.Body.Events
     /// </summary>
     public sealed class RemovedFromPartEvent : EntityEventArgs
     {
-        public SharedBodyPartComponent Old;
+        public EntityUid Old;
 
-        public RemovedFromPartEvent(SharedBodyPartComponent old)
+        public RemovedFromPartEvent(EntityUid old)
         {
             Old = old;
         }
@@ -77,10 +75,10 @@ namespace Content.Shared.Body.Events
     /// </summary>
     public sealed class RemovedFromPartInBodyEvent : EntityEventArgs
     {
-        public SharedBodyComponent OldBody;
-        public SharedBodyPartComponent OldPart;
+        public EntityUid OldBody;
+        public EntityUid OldPart;
 
-        public RemovedFromPartInBodyEvent(SharedBodyComponent oldBody, SharedBodyPartComponent oldPart)
+        public RemovedFromPartInBodyEvent(EntityUid oldBody, EntityUid oldPart)
         {
             OldBody = oldBody;
             OldPart = oldPart;

Content.Shared/Body/Organ/OrganComponent.cs

@@ -0,0 +1,17 @@
+using Content.Shared.Body.Systems;
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Body.Organ;
+
+[RegisterComponent, NetworkedComponent]
+[Access(typeof(SharedBodySystem))]
+public sealed class OrganComponent : Component
+{
+    [ViewVariables]
+    [DataField("body")]
+    public EntityUid? Body;
+
+    [ViewVariables]
+    [DataField("parent")]
+    public OrganSlot? ParentSlot;
+}

Content.Shared/Body/Organ/OrganComponentState.cs

@@ -0,0 +1,16 @@
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Body.Organ;
+
+[Serializable, NetSerializable]
+public sealed class OrganComponentState : ComponentState
+{
+    public readonly EntityUid? Body;
+    public readonly OrganSlot? Parent;
+
+    public OrganComponentState(EntityUid? body, OrganSlot? parent)
+    {
+        Body = body;
+        Parent = parent;
+    }
+}

Content.Shared/Body/Organ/OrganSlot.cs

@@ -0,0 +1,20 @@
+using Content.Shared.Body.Systems;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Body.Organ;
+
+[Serializable, NetSerializable]
+[Access(typeof(SharedBodySystem))]
+[DataRecord]
+public sealed record OrganSlot(string Id, EntityUid Parent)
+{
+    public EntityUid? Child { get; set; }
+
+    // Rider doesn't suggest explicit properties during deconstruction without this
+    public void Deconstruct(out EntityUid? child, out string id, out EntityUid parent)
+    {
+        child = Child;
+        id = Id;
+        parent = Parent;
+    }
+}

Content.Shared/Body/Part/BodyPartCompatibility.cs

@@ -1,18 +0,0 @@
-using Content.Shared.Body.Components;
-using Robust.Shared.Serialization;
-
-namespace Content.Shared.Body.Part
-{
-    //TODO: This should be a prototype. --DrSmugleaf
-    /// <summary>
-    ///     Determines whether two <see cref="SharedBodyPartComponent"/>s can connect.
-    /// </summary>
-    [Serializable, NetSerializable]
-    public enum BodyPartCompatibility
-    {
-        Universal = 0,
-        Biological,
-        Mechanical,
-        Slime,
-    }
-}

Content.Shared/Body/Part/BodyPartComponent.cs

@@ -0,0 +1,44 @@
+using Content.Shared.Body.Components;
+using Content.Shared.Body.Organ;
+using Content.Shared.Body.Systems;
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Body.Part;
+
+[RegisterComponent, NetworkedComponent]
+[Access(typeof(SharedBodySystem))]
+public sealed class BodyPartComponent : Component
+{
+    [ViewVariables]
+    [DataField("body")]
+    public EntityUid? Body;
+
+    [ViewVariables]
+    [DataField("parent")]
+    public BodyPartSlot? ParentSlot;
+
+    [ViewVariables]
+    [DataField("children")]
+    public Dictionary<string, BodyPartSlot> Children = new();
+
+    [ViewVariables]
+    [DataField("organs")]
+    public Dictionary<string, OrganSlot> Organs = new();
+
+    [ViewVariables]
+    [DataField("partType")]
+    public BodyPartType PartType = BodyPartType.Other;
+
+    // TODO BODY Replace with a simulation of organs
+    /// <summary>
+    ///     Whether or not the owning <see cref="Body"/> will die if all
+    ///     <see cref="BodyComponent"/>s of this type are removed from it.
+    /// </summary>
+    [ViewVariables]
+    [DataField("vital")]
+    public bool IsVital;
+
+    [ViewVariables]
+    [DataField("symmetry")]
+    public BodyPartSymmetry Symmetry = BodyPartSymmetry.None;
+}

Content.Shared/Body/Part/BodyPartComponentState.cs

@@ -0,0 +1,34 @@
+using Content.Shared.Body.Organ;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Body.Part;
+
+[Serializable, NetSerializable]
+public sealed class BodyPartComponentState : ComponentState
+{
+    public readonly EntityUid? Body;
+    public readonly BodyPartSlot? ParentSlot;
+    public readonly Dictionary<string, BodyPartSlot> Children;
+    public readonly Dictionary<string, OrganSlot> Organs;
+    public readonly BodyPartType PartType;
+    public readonly bool IsVital;
+    public readonly BodyPartSymmetry Symmetry;
+
+    public BodyPartComponentState(
+        EntityUid? body,
+        BodyPartSlot? parentSlot,
+        Dictionary<string, BodyPartSlot> children,
+        Dictionary<string, OrganSlot> organs,
+        BodyPartType partType,
+        bool isVital,
+        BodyPartSymmetry symmetry)
+    {
+        ParentSlot = parentSlot;
+        Children = children;
+        Organs = organs;
+        PartType = partType;
+        IsVital = isVital;
+        Symmetry = symmetry;
+        Body = body;
+    }
+}

Content.Shared/Body/Part/BodyPartSlot.cs

@@ -1,104 +1,21 @@
-using Content.Shared.Body.Components;
+using Content.Shared.Body.Systems;
+using Robust.Shared.Serialization;
 
-namespace Content.Shared.Body.Part
+namespace Content.Shared.Body.Part;
+
+[Serializable, NetSerializable]
+[Access(typeof(SharedBodySystem))]
+[DataRecord]
+public sealed record BodyPartSlot(string Id, EntityUid Parent, BodyPartType? Type)
 {
-    public sealed class BodyPartSlot
+    public EntityUid? Child { get; set; }
+
+    // Rider doesn't suggest explicit properties during deconstruction without this
+    public void Deconstruct(out EntityUid? child, out string id, out EntityUid parent, out BodyPartType? type)
     {
-        public BodyPartSlot(string id, BodyPartType partType, IEnumerable<BodyPartSlot> connections)
-        {
-            Id = id;
-            PartType = partType;
-            Connections = new HashSet<BodyPartSlot>(connections);
-        }
-
-        public BodyPartSlot(string id, BodyPartType partType)
-        {
-            Id = id;
-            PartType = partType;
-            Connections = new HashSet<BodyPartSlot>();
-        }
-
-        /// <summary>
-        ///     The ID of this slot.
-        /// </summary>
-        [ViewVariables]
-        public string Id { get; }
-
-        /// <summary>
-        ///     The part type that this slot accepts.
-        /// </summary>
-        [ViewVariables]
-        public BodyPartType PartType { get; }
-
-        /// <summary>
-        ///     The part currently in this slot, if any.
-        /// </summary>
-        [ViewVariables]
-        public SharedBodyPartComponent? Part { get; private set; }
-
-        /// <summary>
-        ///     List of slots that this slot connects to.
-        /// </summary>
-        [ViewVariables]
-        public HashSet<BodyPartSlot> Connections { get; private set; }
-
-        public event Action<SharedBodyPartComponent>? PartAdded;
-
-        public event Action<SharedBodyPartComponent>? PartRemoved;
-
-        internal void SetConnectionsInternal(IEnumerable<BodyPartSlot> connections)
-        {
-            Connections = new HashSet<BodyPartSlot>(connections);
-        }
-
-        public bool CanAddPart(SharedBodyPartComponent part)
-        {
-            return Part == null && part.PartType == PartType;
-        }
-
-        public bool TryAddPart(SharedBodyPartComponent part)
-        {
-            if (!CanAddPart(part))
-            {
-                return false;
-            }
-
-            SetPart(part);
-            return true;
-        }
-
-        public void SetPart(SharedBodyPartComponent part)
-        {
-            if (Part != null)
-            {
-                RemovePart();
-            }
-
-            Part = part;
-            PartAdded?.Invoke(part);
-        }
-
-        public bool RemovePart()
-        {
-            if (Part == null)
-            {
-                return false;
-            }
-
-            var old = Part;
-            Part = null;
-
-            PartRemoved?.Invoke(old);
-
-            return true;
-        }
-
-        public void Shutdown()
-        {
-            Part = null;
-            Connections.Clear();
-            PartAdded = null;
-            PartRemoved = null;
-        }
+        child = Child;
+        id = Id;
+        parent = Parent;
+        type = Type;
     }
 }

Content.Shared/Body/Part/BodyPartSymmetry.cs

@@ -4,7 +4,7 @@ using Robust.Shared.Serialization;
 namespace Content.Shared.Body.Part
 {
     /// <summary>
-    ///     Defines the symmetry of a <see cref="SharedBodyPartComponent"/>.
+    ///     Defines the symmetry of a <see cref="BodyComponent"/>.
     /// </summary>
     [Serializable, NetSerializable]
     public enum BodyPartSymmetry

Content.Shared/Body/Part/BodyPartType.cs

@@ -4,7 +4,7 @@ using Robust.Shared.Serialization;
 namespace Content.Shared.Body.Part
 {
     /// <summary>
-    ///     Defines the type of a <see cref="SharedBodyPartComponent"/>.
+    ///     Defines the type of a <see cref="BodyComponent"/>.
     /// </summary>
     [Serializable, NetSerializable]
     public enum BodyPartType

Content.Shared/Body/Part/IBodyPartAdded.cs

@@ -1,5 +1,4 @@
 using Content.Shared.Body.Components;
-using Robust.Shared.Serialization;
 
 namespace Content.Shared.Body.Part
 {
@@ -10,18 +9,16 @@ namespace Content.Shared.Body.Part
     public interface IBodyPartAdded : IComponent
     {
         /// <summary>
-        ///     Called when a <see cref="SharedBodyPartComponent"/> is added to the
+        ///     Called when a <see cref="BodyComponent"/> is added to the
         ///     entity owning this component.
         /// </summary>
         /// <param name="args">Information about the part that was added.</param>
         void BodyPartAdded(BodyPartAddedEventArgs args);
     }
 
-
-    [Serializable, NetSerializable]
     public sealed class BodyPartAddedEventArgs : EventArgs
     {
-        public BodyPartAddedEventArgs(string slot, SharedBodyPartComponent part)
+        public BodyPartAddedEventArgs(string slot, BodyPartComponent part)
         {
             Slot = slot;
             Part = part;
@@ -35,6 +32,6 @@ namespace Content.Shared.Body.Part
         /// <summary>
         ///     The part that was added.
         /// </summary>
-        public SharedBodyPartComponent Part { get; }
+        public BodyPartComponent Part { get; }
     }
 }

Content.Shared/Body/Part/IBodyPartRemoved.cs

@@ -1,5 +1,4 @@
 using Content.Shared.Body.Components;
-using Robust.Shared.Serialization;
 
 namespace Content.Shared.Body.Part
 {
@@ -10,17 +9,16 @@ namespace Content.Shared.Body.Part
     public interface IBodyPartRemoved
     {
         /// <summary>
-        ///     Called when a <see cref="SharedBodyPartComponent"/> is removed from the
+        ///     Called when a <see cref="BodyComponent"/> is removed from the
         ///     entity owning this component.
         /// </summary>
         /// <param name="args">Information about the part that was removed.</param>
         void BodyPartRemoved(BodyPartRemovedEventArgs args);
     }
 
-    [Serializable, NetSerializable]
     public sealed class BodyPartRemovedEventArgs : EventArgs
     {
-        public BodyPartRemovedEventArgs(string slot, SharedBodyPartComponent part)
+        public BodyPartRemovedEventArgs(string slot, BodyPartComponent part)
         {
             Slot = slot;
             Part = part;
@@ -34,6 +32,6 @@ namespace Content.Shared.Body.Part
         /// <summary>
         ///     The part that was removed.
         /// </summary>
-        public SharedBodyPartComponent Part { get; }
+        public BodyPartComponent Part { get; }
     }
 }

Content.Shared/Body/Prototypes/BodyPresetPrototype.cs

@@ -1,27 +0,0 @@
-using Robust.Shared.Prototypes;
-using Robust.Shared.Serialization;
-
-namespace Content.Shared.Body.Prototypes
-{
-    /// <summary>
-    ///     Defines the parts used in a body.
-    /// </summary>
-    [Prototype("bodyPreset")]
-    [Serializable, NetSerializable]
-    public sealed class BodyPresetPrototype : IPrototype
-    {
-        [ViewVariables]
-        [IdDataFieldAttribute]
-        public string ID { get; } = default!;
-
-        [DataField("partIDs")]
-        private Dictionary<string, string> _partIDs = new();
-
-        [ViewVariables]
-        [DataField("name")]
-        public string Name { get; } = string.Empty;
-
-        [ViewVariables]
-        public Dictionary<string, string> PartIDs => new(_partIDs);
-    }
-}

Content.Shared/Body/Prototypes/BodyPrototype.cs

@@ -0,0 +1,54 @@
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.Body.Prototypes;
+
+[Prototype("body")]
+public sealed class BodyPrototype : IPrototype
+{
+    [IdDataField] public string ID { get; } = default!;
+
+    private string _name = string.Empty;
+
+    [DataField("name")]
+    public string Name
+    {
+        get => _name;
+        private set => _name = Loc.GetString(value);
+    }
+
+    [DataField("root")] public string Root { get; } = string.Empty;
+
+    [DataField("slots")] public Dictionary<string, BodyPrototypeSlot> Slots { get; } = new();
+
+    private BodyPrototype() { }
+
+    public BodyPrototype(string id, string name, string root, Dictionary<string, BodyPrototypeSlot> slots)
+    {
+        ID = id;
+        Name = name;
+        Root = root;
+        Slots = slots;
+    }
+}
+
+[DataRecord]
+public sealed record BodyPrototypeSlot
+{
+    [DataField("part", required: true)] public readonly string Part = default!;
+    public readonly HashSet<string> Connections = new();
+    public readonly Dictionary<string, string> Organs = new();
+
+    public BodyPrototypeSlot(string part, HashSet<string>? connections, Dictionary<string, string>? organs)
+    {
+        Part = part;
+        Connections = connections ?? new HashSet<string>();
+        Organs = organs ?? new Dictionary<string, string>();
+    }
+
+    public void Deconstruct(out string part, out HashSet<string> connections, out Dictionary<string, string> organs)
+    {
+        part = Part;
+        connections = Connections;
+        organs = Organs;
+    }
+}

Content.Shared/Body/Prototypes/BodyPrototypeSerializer.cs

@@ -0,0 +1,191 @@
+using System.Linq;
+using Content.Shared.Body.Organ;
+using Content.Shared.Prototypes;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization.Manager;
+using Robust.Shared.Serialization.Markdown.Mapping;
+using Robust.Shared.Serialization.Markdown.Sequence;
+using Robust.Shared.Serialization.Markdown.Validation;
+using Robust.Shared.Serialization.Markdown.Value;
+using Robust.Shared.Serialization.TypeSerializers.Interfaces;
+
+namespace Content.Shared.Body.Prototypes;
+
+[TypeSerializer]
+public sealed class BodyPrototypeSerializer : ITypeReader<BodyPrototype, MappingDataNode>
+{
+    private (ValidationNode Node, List<string> Connections) ValidateSlot(ISerializationManager serializationManager, MappingDataNode slot, string slotId, IDependencyCollection dependencies)
+    {
+        var nodes = new List<ValidationNode>();
+        var prototypes = dependencies.Resolve<IPrototypeManager>();
+        if (!slot.TryGet("part", out ValueDataNode? part))
+        {
+            nodes.Add(new ErrorNode(slot, $"No part value data node found in root slot {slotId}"));
+        }
+        else if (!prototypes.HasIndex<EntityPrototype>(part.Value))
+        {
+            nodes.Add(new ErrorNode(slot, $"No entity prototype found with id {part.Value} for root slot {slotId}"));
+        }
+
+        var connections = new List<string>();
+        if (slot.TryGet("connections", out SequenceDataNode? connectionsNode))
+        {
+            foreach (var node in connectionsNode)
+            {
+                if (node is not ValueDataNode connection)
+                {
+                    nodes.Add(new ErrorNode(node, $"Connection is not a value data node"));
+                    continue;
+                }
+
+                connections.Add(connection.Value);
+            }
+        }
+
+        if (slot.TryGet("organs", out MappingDataNode? organsNode))
+        {
+            foreach (var (key, value) in organsNode)
+            {
+                if (key is not ValueDataNode)
+                {
+                    nodes.Add(new ErrorNode(key, $"Key is not a value data node"));
+                    continue;
+                }
+
+                if (value is not ValueDataNode organ)
+                {
+                    nodes.Add(new ErrorNode(value, $"Value is not a value data node"));
+                    continue;
+                }
+
+                if (!prototypes.TryIndex(organ.Value, out EntityPrototype? organPrototype))
+                {
+                    nodes.Add(new ErrorNode(value, $"No organ entity prototype found with id {organ.Value}"));
+                    continue;
+                }
+
+                if (!organPrototype.HasComponent<OrganComponent>())
+                {
+                    nodes.Add(new ErrorNode(value, $"Organ {organ.Value} does not have a body component"));
+                }
+            }
+        }
+
+        var validation = new ValidatedSequenceNode(nodes);
+        return (validation, connections);
+    }
+
+    public ValidationNode Validate(ISerializationManager serializationManager, MappingDataNode node,
+        IDependencyCollection dependencies, ISerializationContext? context = null)
+    {
+        var nodes = new List<ValidationNode>();
+        if (!node.TryGet("id", out ValueDataNode? id))
+            nodes.Add(new ErrorNode(node, "No id value data node found"));
+
+        if (!node.TryGet("root", out ValueDataNode? root))
+            nodes.Add(new ErrorNode(node, $"No root value data node found"));
+
+        if (!node.TryGet("slots", out MappingDataNode? slots))
+        {
+            nodes.Add(new ErrorNode(node, $"No slots mapping data node found"));
+        }
+        else if (root != null)
+        {
+            if (!slots.TryGet(root.Value, out MappingDataNode? _))
+            {
+                nodes.Add(new ErrorNode(slots, $"No slot found with id {root.Value}"));
+                return new ValidatedSequenceNode(nodes);
+            }
+
+            foreach (var (key, value) in slots)
+            {
+                if (key is not ValueDataNode)
+                {
+                    nodes.Add(new ErrorNode(key, $"Key is not a value data node"));
+                    continue;
+                }
+
+                if (value is not MappingDataNode slot)
+                {
+                    nodes.Add(new ErrorNode(value, $"Slot is not a mapping data node"));
+                    continue;
+                }
+
+                var result = ValidateSlot(serializationManager, slot, root.Value, dependencies);
+                nodes.Add(result.Node);
+
+                foreach (var connection in result.Connections)
+                {
+                    if (!slots.TryGet(connection, out MappingDataNode? _))
+                        nodes.Add(new ErrorNode(slots, $"No slot found with id {connection}"));
+                }
+            }
+        }
+
+        return new ValidatedSequenceNode(nodes);
+    }
+
+    public BodyPrototype Read(ISerializationManager serializationManager, MappingDataNode node, IDependencyCollection dependencies,
+        bool skipHook, ISerializationContext? context = null, BodyPrototype? value = default)
+    {
+        var id = node.Get<ValueDataNode>("id").Value;
+        var name = node.Get<ValueDataNode>("name").Value;
+        var root = node.Get<ValueDataNode>("root").Value;
+        var slotNodes = node.Get<MappingDataNode>("slots");
+        var allConnections = new Dictionary<string, (string Part, HashSet<string>? Connections, Dictionary<string, string>? Organs)>();
+
+        foreach (var (keyNode, valueNode) in slotNodes)
+        {
+            var slotId = ((ValueDataNode) keyNode).Value;
+            var slot = ((MappingDataNode) valueNode);
+            var part = slot.Get<ValueDataNode>("part").Value;
+
+            HashSet<string>? connections = null;
+            if (slot.TryGet("connections", out SequenceDataNode? slotConnectionsNode))
+            {
+                connections = new HashSet<string>();
+
+                foreach (var connection in slotConnectionsNode.Cast<ValueDataNode>())
+                {
+                    connections.Add(connection.Value);
+                }
+            }
+
+            Dictionary<string, string>? organs = null;
+            if (slot.TryGet("organs", out MappingDataNode? slotOrgansNode))
+            {
+                organs = new Dictionary<string, string>();
+
+                foreach (var (organKeyNode, organValueNode) in slotOrgansNode)
+                {
+                    organs.Add(((ValueDataNode) organKeyNode).Value, ((ValueDataNode) organValueNode).Value);
+                }
+            }
+
+            allConnections.Add(slotId, (part, connections, organs));
+        }
+
+        foreach (var (slotId, (_, connections, _)) in allConnections)
+        {
+            if (connections == null)
+                continue;
+
+            foreach (var connection in connections)
+            {
+                var other = allConnections[connection];
+                other.Connections ??= new HashSet<string>();
+                other.Connections.Add(slotId);
+                allConnections[connection] = other;
+            }
+        }
+
+        var slots = new Dictionary<string, BodyPrototypeSlot>();
+        foreach (var (slotId, (part, connections, organs)) in allConnections)
+        {
+            var slot = new BodyPrototypeSlot(part, connections, organs);
+            slots.Add(slotId, slot);
+        }
+
+        return new BodyPrototype(id, name, root, slots);
+    }
+}

Content.Shared/Body/Prototypes/BodyTemplatePrototype.cs

@@ -1,86 +0,0 @@
-using Content.Shared.Body.Part;
-using Robust.Shared.Prototypes;
-using Robust.Shared.Serialization;
-
-namespace Content.Shared.Body.Prototypes
-{
-    /// <summary>
-    ///     Defines the layout of a body.
-    /// </summary>
-    [Prototype("bodyTemplate")]
-    [Serializable, NetSerializable]
-    public sealed class BodyTemplatePrototype : IPrototype, ISerializationHooks
-    {
-        [DataField("slots")]
-        private Dictionary<string, BodyPartType> _slots = new();
-
-        [DataField("connections")]
-        private Dictionary<string, List<string>> _rawConnections = new();
-
-        [DataField("layers")]
-        private Dictionary<string, string> _layers = new();
-
-        [DataField("mechanismLayers")]
-        private Dictionary<string, string> _mechanismLayers = new();
-
-        [ViewVariables]
-        [IdDataFieldAttribute]
-        public string ID { get; } = default!;
-
-        [ViewVariables]
-        [DataField("name")]
-        public string Name { get; } = string.Empty;
-
-        [ViewVariables]
-        [DataField("centerSlot")]
-        public string CenterSlot { get; } = string.Empty;
-
-        [ViewVariables]
-        public Dictionary<string, BodyPartType> Slots => new(_slots);
-
-        [ViewVariables]
-        public Dictionary<string, HashSet<string>> Connections { get; set; } = new();
-
-        [ViewVariables]
-        public Dictionary<string, string> Layers => new(_layers);
-
-        [ViewVariables]
-        public Dictionary<string, string> MechanismLayers => new(_mechanismLayers);
-
-        void ISerializationHooks.AfterDeserialization()
-        {
-            //Our prototypes don't force the user to define a BodyPart connection twice. E.g. Head: Torso v.s. Torso: Head.
-            //The user only has to do one. We want it to be that way in the code, though, so this cleans that up.
-            var cleanedConnections = new Dictionary<string, HashSet<string>>();
-
-            foreach (var targetSlotName in _slots.Keys)
-            {
-                var tempConnections = new HashSet<string>();
-                foreach (var (slotName, slotConnections) in _rawConnections)
-                {
-                    if (slotName == targetSlotName)
-                    {
-                        foreach (var connection in slotConnections)
-                        {
-                            if (!tempConnections.Contains(connection))
-                            {
-                                tempConnections.Add(connection);
-                            }
-                        }
-                    }
-                    else if (slotConnections.Contains(targetSlotName))
-                    {
-                        tempConnections.Add(slotName);
-                    }
-                }
-
-                if (tempConnections.Count > 0)
-                {
-                    cleanedConnections.Add(targetSlotName, tempConnections);
-                }
-            }
-
-            Connections = cleanedConnections;
-        }
-    }
-}

Content.Shared/Body/Systems/SharedBodySystem.Body.cs

@@ -0,0 +1,213 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using Content.Shared.Body.Components;
+using Content.Shared.Body.Organ;
+using Content.Shared.Body.Part;
+using Content.Shared.Body.Prototypes;
+using Content.Shared.Coordinates;
+using Robust.Shared.Containers;
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Body.Systems;
+
+public partial class SharedBodySystem
+{
+    public void InitializeBody()
+    {
+        SubscribeLocalEvent<BodyComponent, MapInitEvent>(OnBodyMapInit);
+        SubscribeLocalEvent<BodyComponent, ComponentInit>(OnBodyInit);
+
+        SubscribeLocalEvent<BodyComponent, ComponentGetState>(OnBodyGetState);
+        SubscribeLocalEvent<BodyComponent, ComponentHandleState>(OnBodyHandleState);
+    }
+
+    private void OnBodyMapInit(EntityUid bodyId, BodyComponent body, MapInitEvent args)
+    {
+        // ReSharper disable once ConditionIsAlwaysTrueOrFalseAccordingToNullableAPIContract
+        if (body.Prototype == null || body.Root != null)
+            return;
+
+        var prototype = Prototypes.Index<BodyPrototype>(body.Prototype);
+        InitBody(body, prototype);
+    }
+
+    private void OnBodyInit(EntityUid bodyId, BodyComponent body, ComponentInit args)
+    {
+        // ReSharper disable once ConditionIsAlwaysTrueOrFalseAccordingToNullableAPIContract
+        if (body.Prototype == null || body.Root != null)
+            return;
+
+        var prototype = Prototypes.Index<BodyPrototype>(body.Prototype);
+        InitBody(body, prototype);
+    }
+
+    private void OnBodyGetState(EntityUid uid, BodyComponent body, ref ComponentGetState args)
+    {
+        args.State = new BodyComponentState(body.Root, body.GibSound);
+    }
+
+    private void OnBodyHandleState(EntityUid uid, BodyComponent body, ref ComponentHandleState args)
+    {
+        if (args.Current is not BodyComponentState state)
+            return;
+
+        body.Root = state.Root;
+        body.GibSound = state.GibSound;
+    }
+
+    public bool TryCreateBodyRootSlot(
+        EntityUid? bodyId,
+        string slotId,
+        [NotNullWhen(true)] out BodyPartSlot? slot,
+        BodyComponent? body = null)
+    {
+        slot = null;
+
+        // ReSharper disable once ConditionIsAlwaysTrueOrFalseAccordingToNullableAPIContract
+        if (bodyId == null ||
+            !Resolve(bodyId.Value, ref body, false) ||
+            body.Root != null)
+            return false;
+
+        slot = new BodyPartSlot(slotId, bodyId.Value, null);
+        body.Root = slot;
+
+        return true;
+    }
+
+    private void InitBody(BodyComponent body, BodyPrototype prototype)
+    {
+        var root = prototype.Slots[prototype.Root];
+        var bodyId = Spawn(root.Part, body.Owner.ToCoordinates());
+        var partComponent = Comp<BodyPartComponent>(bodyId);
+        var slot = new BodyPartSlot(root.Part, body.Owner, partComponent.PartType);
+        body.Root = slot;
+        partComponent.Body = bodyId;
+
+        Containers.EnsureContainer<Container>(body.Owner, BodyContainerId);
+
+        AttachPart(bodyId, slot, partComponent);
+        InitPart(partComponent, prototype, prototype.Root);
+    }
+
+    private void InitPart(BodyPartComponent parent, BodyPrototype prototype, string slotId, HashSet<string>? initialized = null)
+    {
+        initialized ??= new HashSet<string>();
+
+        if (initialized.Contains(slotId))
+            return;
+
+        initialized.Add(slotId);
+
+        var (_, connections, organs) = prototype.Slots[slotId];
+        connections = new HashSet<string>(connections);
+        connections.ExceptWith(initialized);
+
+        var coordinates = parent.Owner.ToCoordinates();
+        var subConnections = new List<(BodyPartComponent child, string slotId)>();
+
+        Containers.EnsureContainer<Container>(parent.Owner, BodyContainerId);
+
+        foreach (var connection in connections)
+        {
+            var childSlot = prototype.Slots[connection];
+            var childPart = Spawn(childSlot.Part, coordinates);
+            var childPartComponent = Comp<BodyPartComponent>(childPart);
+            var slot = CreatePartSlot(connection, parent.Owner, childPartComponent.PartType, parent);
+            if (slot == null)
+            {
+                Logger.Error($"Could not create slot for connection {connection} in body {prototype.ID}");
+                continue;
+            }
+
+            AttachPart(childPart, slot, childPartComponent);
+            subConnections.Add((childPartComponent, connection));
+        }
+
+        foreach (var (organSlotId, organId) in organs)
+        {
+            var organ = Spawn(organId, coordinates);
+            var organComponent = Comp<OrganComponent>(organ);
+
+            var slot = CreateOrganSlot(organSlotId, parent.Owner, parent);
+            if (slot == null)
+            {
+                Logger.Error($"Could not create slot for connection {organSlotId} in body {prototype.ID}");
+                continue;
+            }
+
+            InsertOrgan(organ, slot, organComponent);
+        }
+
+        foreach (var connection in subConnections)
+        {
+            InitPart(connection.child, prototype, connection.slotId, initialized);
+        }
+    }
+    public IEnumerable<(EntityUid Id, BodyPartComponent Component)> GetBodyChildren(EntityUid? id, BodyComponent? body = null)
+    {
+        if (id == null ||
+            !Resolve(id.Value, ref body, false) ||
+            !TryComp(body.Root.Child, out BodyPartComponent? part))
+            yield break;
+
+        yield return (body.Root.Child.Value, part);
+
+        foreach (var child in GetPartChildren(body.Root.Child))
+        {
+            yield return child;
+        }
+    }
+
+    public IEnumerable<(EntityUid Id, OrganComponent Component)> GetBodyOrgans(EntityUid? bodyId, BodyComponent? body = null)
+    {
+        if (bodyId == null || !Resolve(bodyId.Value, ref body, false))
+            yield break;
+
+        foreach (var part in GetBodyChildren(bodyId, body))
+        {
+            foreach (var organ in GetPartOrgans(part.Id, part.Component))
+            {
+                yield return organ;
+            }
+        }
+    }
+
+    public IEnumerable<BodyPartSlot> GetBodyAllSlots(EntityUid? bodyId, BodyComponent? body = null)
+    {
+        if (bodyId == null || !Resolve(bodyId.Value, ref body, false))
+            yield break;
+
+        foreach (var slot in GetPartAllSlots(body.Root.Child))
+        {
+            yield return slot;
+        }
+    }
+
+    public virtual HashSet<EntityUid> GibBody(EntityUid? partId, bool gibOrgans = false,
+        BodyComponent? body = null)
+    {
+        if (partId == null || !Resolve(partId.Value, ref body, false))
+            return new HashSet<EntityUid>();
+
+        var parts = GetBodyChildren(partId, body).ToArray();
+        var gibs = new HashSet<EntityUid>(parts.Length);
+
+        foreach (var part in parts)
+        {
+            DropPart(part.Id, part.Component);
+            gibs.Add(part.Id);
+
+            if (!gibOrgans)
+                continue;
+
+            foreach (var organ in GetPartOrgans(part.Id, part.Component))
+            {
+                DropOrgan(organ.Id, organ.Component);
+                gibs.Add(organ.Id);
+            }
+        }
+
+        return gibs;
+    }
+}

Content.Shared/Body/Systems/SharedBodySystem.Organs.cs

@@ -0,0 +1,230 @@
+using System.Diagnostics.CodeAnalysis;
+using Content.Shared.Body.Components;
+using Content.Shared.Body.Events;
+using Content.Shared.Body.Organ;
+using Content.Shared.Body.Part;
+using Content.Shared.Random.Helpers;
+using Robust.Shared.Containers;
+using Robust.Shared.GameStates;
+using Robust.Shared.Map;
+
+namespace Content.Shared.Body.Systems;
+
+public partial class SharedBodySystem
+{
+    private void InitializeOrgans()
+    {
+        SubscribeLocalEvent<OrganComponent, ComponentGetState>(OnOrganGetState);
+        SubscribeLocalEvent<OrganComponent, ComponentHandleState>(OnOrganHandleState);
+    }
+
+    private OrganSlot? CreateOrganSlot(string slotId, EntityUid parent, BodyPartComponent? part = null)
+    {
+        if (!Resolve(parent, ref part, false))
+            return null;
+
+        var slot = new OrganSlot(slotId, parent);
+        part.Organs.Add(slotId, slot);
+
+        return slot;
+    }
+
+    private bool CanInsertOrgan(EntityUid? organId, OrganSlot slot, OrganComponent? organ = null)
+    {
+        return organId != null &&
+               slot.Child == null &&
+               Resolve(organId.Value, ref organ, false) &&
+               Containers.TryGetContainer(slot.Parent, BodyContainerId, out var container) &&
+               container.CanInsert(organId.Value);
+    }
+
+    private void OnOrganGetState(EntityUid uid, OrganComponent organ, ref ComponentGetState args)
+    {
+        args.State = new OrganComponentState(organ.Body, organ.ParentSlot);
+    }
+
+    private void OnOrganHandleState(EntityUid uid, OrganComponent organ, ref ComponentHandleState args)
+    {
+        if (args.Current is not OrganComponentState state)
+            return;
+
+        organ.Body = state.Body;
+        organ.ParentSlot = state.Parent;
+    }
+
+    public bool InsertOrgan(EntityUid? organId, OrganSlot slot, OrganComponent? organ = null)
+    {
+        if (organId == null ||
+            !Resolve(organId.Value, ref organ, false) ||
+            !CanInsertOrgan(organId, slot, organ))
+            return false;
+
+        DropOrgan(slot.Child);
+        DropOrgan(organId, organ);
+
+        var container = Containers.EnsureContainer<Container>(slot.Parent, BodyContainerId);
+        if (!container.Insert(organId.Value))
+            return false;
+
+        slot.Child = organId;
+        organ.ParentSlot = slot;
+        organ.Body = CompOrNull<BodyPartComponent>(slot.Parent)?.Body;
+
+        Dirty(slot.Parent);
+        Dirty(organId.Value);
+
+        if (organ.Body == null)
+        {
+            RaiseLocalEvent(organId.Value, new AddedToPartEvent(slot.Parent));
+        }
+        else
+        {
+            RaiseLocalEvent(organId.Value, new AddedToPartInBodyEvent(organ.Body.Value, slot.Parent));
+        }
+
+        return true;
+    }
+
+    public bool AddOrganToFirstValidSlot(
+        EntityUid? childId,
+        EntityUid? parentId,
+        OrganComponent? child = null,
+        BodyPartComponent? parent = null)
+    {
+        if (childId == null ||
+            !Resolve(childId.Value, ref child, false) ||
+            parentId == null ||
+            !Resolve(parentId.Value, ref parent, false))
+            return false;
+
+        foreach (var slot in parent.Organs.Values)
+        {
+            if (slot.Child == null)
+                continue;
+
+            InsertOrgan(childId, slot, child);
+            return true;
+        }
+
+        return false;
+    }
+
+    public bool DropOrgan(EntityUid? organId, OrganComponent? organ = null)
+    {
+        if (organId == null ||
+            !Resolve(organId.Value, ref organ, false) ||
+            organ.ParentSlot is not { } slot)
+            return false;
+
+        var oldParent = CompOrNull<BodyPartComponent>(organ.ParentSlot.Parent);
+
+        slot.Child = null;
+        organ.ParentSlot = null;
+        organ.Body = null;
+
+        if (Containers.TryGetContainer(slot.Parent, BodyContainerId, out var container))
+            container.Remove(organId.Value);
+
+        if (TryComp(organId, out TransformComponent? transform))
+            transform.AttachToGridOrMap();
+
+        organ.Owner.RandomOffset(0.25f);
+
+        if (oldParent == null)
+            return true;
+
+        if (oldParent.Body != null)
+        {
+            RaiseLocalEvent(organId.Value, new RemovedFromPartInBodyEvent(oldParent.Body.Value, oldParent.Owner));
+        }
+        else
+        {
+            RaiseLocalEvent(organId.Value, new RemovedFromPartEvent(oldParent.Owner));
+        }
+
+        return true;
+    }
+
+    public bool DropOrganAt(EntityUid? organId, EntityCoordinates dropAt, OrganComponent? organ = null)
+    {
+        if (organId == null || !DropOrgan(organId, organ))
+            return false;
+
+        if (TryComp(organId.Value, out TransformComponent? transform))
+            transform.Coordinates = dropAt;
+
+        return true;
+    }
+
+    public bool DeleteOrgan(EntityUid? id, OrganComponent? part = null)
+    {
+        if (id == null || !Resolve(id.Value, ref part, false))
+            return false;
+
+        DropOrgan(id, part);
+
+        if (Deleted(id.Value))
+            return false;
+
+        Del(id.Value);
+        return true;
+    }
+
+    /// <summary>
+    ///     Returns a list of ValueTuples of <see cref="T"/> and OrganComponent on each organ
+    ///     in the given body.
+    /// </summary>
+    /// <param name="uid">The entity to check for the component on.</param>
+    /// <param name="body">The body to check for organs on.</param>
+    /// <typeparam name="T">The component to check for.</typeparam>
+    public List<(T Comp, OrganComponent Organ)> GetBodyOrganComponents<T>(
+        EntityUid uid,
+        BodyComponent? body = null)
+        where T : Component
+    {
+        if (!Resolve(uid, ref body))
+            return new List<(T Comp, OrganComponent Organ)>();
+
+        var query = EntityManager.GetEntityQuery<T>();
+        var list = new List<(T Comp, OrganComponent Organ)>(3);
+        foreach (var organ in GetBodyOrgans(uid, body))
+        {
+            if (query.TryGetComponent(organ.Id, out var comp))
+                list.Add((comp, organ.Component));
+        }
+
+        return list;
+    }
+
+    /// <summary>
+    ///     Tries to get a list of ValueTuples of <see cref="T"/> and OrganComponent on each organs
+    ///     in the given body.
+    /// </summary>
+    /// <param name="uid">The entity to check for the component on.</param>
+    /// <param name="comps">The list of components.</param>
+    /// <param name="body">The body to check for organs on.</param>
+    /// <typeparam name="T">The component to check for.</typeparam>
+    /// <returns>Whether any were found.</returns>
+    public bool TryGetBodyOrganComponents<T>(
+        EntityUid uid,
+        [NotNullWhen(true)] out List<(T Comp, OrganComponent Organ)>? comps,
+        BodyComponent? body = null)
+        where T : Component
+    {
+        if (!Resolve(uid, ref body))
+        {
+            comps = null;
+            return false;
+        }
+
+        comps = GetBodyOrganComponents<T>(uid, body);
+
+        if (comps.Count == 0)
+        {
+            comps = null;
+            return false;
+        }
+
+        return true;
+    }
+}

Content.Shared/Body/Systems/SharedBodySystem.Parts.cs

@@ -0,0 +1,359 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using Content.Shared.Body.Components;
+using Content.Shared.Body.Events;
+using Content.Shared.Body.Organ;
+using Content.Shared.Body.Part;
+using Content.Shared.Damage;
+using Content.Shared.Damage.Prototypes;
+using Content.Shared.Random.Helpers;
+using Robust.Shared.Containers;
+using Robust.Shared.GameStates;
+using Robust.Shared.Map;
+
+namespace Content.Shared.Body.Systems;
+
+public partial class SharedBodySystem
+{
+    private void InitializeParts()
+    {
+        SubscribeLocalEvent<BodyPartComponent, ComponentRemove>(OnPartRemoved);
+        SubscribeLocalEvent<BodyPartComponent, ComponentGetState>(OnPartGetState);
+        SubscribeLocalEvent<BodyPartComponent, ComponentHandleState>(OnPartHandleState);
+    }
+
+    private void OnPartGetState(EntityUid uid, BodyPartComponent part, ref ComponentGetState args)
+    {
+        args.State = new BodyPartComponentState(
+            part.Body,
+            part.ParentSlot,
+            part.Children,
+            part.Organs,
+            part.PartType,
+            part.IsVital,
+            part.Symmetry
+        );
+    }
+
+    private void OnPartHandleState(EntityUid uid, BodyPartComponent part, ref ComponentHandleState args)
+    {
+        if (args.Current is not BodyPartComponentState state)
+            return;
+
+        part.Body = state.Body;
+        part.ParentSlot = state.ParentSlot;
+        part.Children = state.Children;
+        part.Organs = state.Organs;
+        part.PartType = state.PartType;
+        part.IsVital = state.IsVital;
+        part.Symmetry = state.Symmetry;
+    }
+
+    private void OnPartRemoved(EntityUid uid, BodyPartComponent part, ComponentRemove args)
+    {
+        if (part.ParentSlot is { } slot)
+        {
+            slot.Child = null;
+            Dirty(slot.Parent);
+        }
+
+        foreach (var childSlot in part.Children.Values.ToArray())
+        {
+            DropPart(childSlot.Child);
+        }
+    }
+
+    private BodyPartSlot? CreatePartSlot(
+        string slotId,
+        EntityUid parent,
+        BodyPartType partType,
+        BodyPartComponent? part = null)
+    {
+        if (!Resolve(parent, ref part, false))
+            return null;
+
+        var slot = new BodyPartSlot(slotId, parent, partType);
+        part.Children.Add(slotId, slot);
+
+        return slot;
+    }
+
+    public bool TryCreatePartSlot(
+        EntityUid? parentId,
+        string id,
+        [NotNullWhen(true)] out BodyPartSlot? slot,
+        BodyPartComponent? parent = null)
+    {
+        slot = null;
+
+        if (parentId == null ||
+            !Resolve(parentId.Value, ref parent, false))
+            return false;
+
+        slot = new BodyPartSlot(id, parentId.Value, null);
+        if (!parent.Children.TryAdd(id, slot))
+        {
+            slot = null;
+            return false;
+        }
+
+        return true;
+    }
+
+    public bool TryCreatePartSlotAndAttach(
+        EntityUid? parentId,
+        string id,
+        EntityUid? childId,
+        BodyPartComponent? parent = null,
+        BodyPartComponent? child = null)
+    {
+        return TryCreatePartSlot(parentId, id, out var slot, parent) && AttachPart(childId, slot, child);
+    }
+
+    public IEnumerable<(EntityUid Id, BodyPartComponent Component)> GetPartChildren(EntityUid? id, BodyPartComponent? part = null)
+    {
+        if (id == null || !Resolve(id.Value, ref part, false))
+            yield break;
+
+        foreach (var slot in part.Children.Values)
+        {
+            if (!TryComp(slot.Child, out BodyPartComponent? childPart))
+                continue;
+
+            yield return (slot.Child.Value, childPart);
+
+            foreach (var subChild in GetPartChildren(slot.Child, childPart))
+            {
+                yield return subChild;
+            }
+        }
+    }
+
+    public IEnumerable<(EntityUid Id, OrganComponent Component)> GetPartOrgans(EntityUid? partId, BodyPartComponent? part = null)
+    {
+        if (partId == null || !Resolve(partId.Value, ref part, false))
+            yield break;
+
+        foreach (var slot in part.Organs.Values)
+        {
+            if (!TryComp(slot.Child, out OrganComponent? organ))
+                continue;
+
+            yield return (slot.Child.Value, organ);
+        }
+    }
+
+    public IEnumerable<BodyPartSlot> GetPartAllSlots(EntityUid? partId, BodyPartComponent? part = null)
+    {
+        if (partId == null ||
+            !Resolve(partId.Value, ref part, false))
+            yield break;
+
+        foreach (var slot in part.Children.Values)
+        {
+            yield return slot;
+
+            if (!TryComp(slot.Child, out BodyComponent? childPart))
+                continue;
+
+            foreach (var subChild in GetBodyAllSlots(slot.Child, childPart))
+            {
+                yield return subChild;
+            }
+        }
+    }
+
+    public bool CanAttachPart([NotNullWhen(true)] EntityUid? partId, BodyPartSlot slot, BodyPartComponent? part = null)
+    {
+        return partId != null &&
+               slot.Child == null &&
+               Resolve(partId.Value, ref part, false) &&
+               (slot.Type == null || slot.Type == part.PartType) &&
+               Containers.TryGetContainer(slot.Parent, BodyContainerId, out var container) &&
+               container.CanInsert(partId.Value);
+    }
+
+    public virtual bool AttachPart(
+        EntityUid? partId,
+        BodyPartSlot slot,
+        [NotNullWhen(true)] BodyPartComponent? part = null)
+    {
+        if (partId == null ||
+            !Resolve(partId.Value, ref part, false) ||
+            !CanAttachPart(partId, slot, part))
+            return false;
+
+        DropPart(slot.Child);
+        DropPart(partId, part);
+
+        var container = Containers.EnsureContainer<Container>(slot.Parent, BodyContainerId);
+        if (!container.Insert(partId.Value))
+            return false;
+
+        slot.Child = partId;
+        part.ParentSlot = slot;
+
+        if (TryComp(slot.Parent, out BodyPartComponent? parentPart))
+        {
+            part.Body = parentPart.Body;
+        }
+        else if (TryComp(slot.Parent, out BodyComponent? parentBody))
+        {
+            part.Body = parentBody.Owner;
+        }
+        else
+        {
+            part.Body = null;
+        }
+
+        Dirty(slot.Parent);
+        Dirty(partId.Value);
+
+        if (part.Body is { } newBody)
+        {
+            var argsAdded = new BodyPartAddedEventArgs(slot.Id, part);
+
+            // TODO: Body refactor. Somebody is doing it
+            // EntitySystem.Get<SharedHumanoidAppearanceSystem>().BodyPartAdded(Owner, argsAdded);
+            foreach (var component in AllComps<IBodyPartAdded>(newBody).ToArray())
+            {
+                component.BodyPartAdded(argsAdded);
+            }
+
+            foreach (var organ in GetPartOrgans(partId, part))
+            {
+                RaiseLocalEvent(organ.Id, new AddedToBodyEvent(newBody), true);
+            }
+
+            Dirty(newBody);
+        }
+
+        return true;
+    }
+
+    public virtual bool DropPart(EntityUid? partId, [NotNullWhen(true)] BodyPartComponent? part = null)
+    {
+        if (partId == null ||
+            !Resolve(partId.Value, ref part, false) ||
+            part.ParentSlot is not { } slot)
+            return false;
+
+        var oldBody = part.Body;
+
+        slot.Child = null;
+        part.ParentSlot = null;
+        part.Body = null;
+
+        if (Containers.TryGetContainer(slot.Parent, BodyContainerId, out var container))
+            container.Remove(partId.Value);
+
+        if (TryComp(partId, out TransformComponent? transform))
+            transform.AttachToGridOrMap();
+
+        part.Owner.RandomOffset(0.25f);
+
+        if (oldBody != null)
+        {
+            var args = new BodyPartRemovedEventArgs(slot.Id, part);
+            foreach (var component in AllComps<IBodyPartRemoved>(oldBody.Value))
+            {
+                component.BodyPartRemoved(args);
+            }
+
+            if (part.PartType == BodyPartType.Leg &&
+                !GetBodyChildrenOfType(oldBody, BodyPartType.Leg).Any())
+            {
+                Standing.Down(oldBody.Value);
+            }
+
+            if (part.IsVital && !GetBodyChildrenOfType(oldBody, part.PartType).Any())
+            {
+                // TODO BODY SYSTEM KILL : Find a more elegant way of killing em than just dumping bloodloss damage.
+                var damage = new DamageSpecifier(Prototypes.Index<DamageTypePrototype>("Bloodloss"), 300);
+                Damageable.TryChangeDamage(part.Owner, damage);
+            }
+
+            foreach (var organSlot in part.Organs.Values)
+            {
+                if (organSlot.Child is not { } child)
+                    continue;
+
+                RaiseLocalEvent(child, new RemovedFromBodyEvent(oldBody.Value), true);
+            }
+        }
+
+        Dirty(slot.Parent);
+        Dirty(partId.Value);
+
+        return true;
+    }
+
+    public bool DropPartAt(EntityUid? partId, EntityCoordinates dropAt, BodyPartComponent? part = null)
+    {
+        if (partId == null || !DropPart(partId, part))
+            return false;
+
+        if (TryComp(partId.Value, out TransformComponent? transform))
+            transform.Coordinates = dropAt;
+
+        return true;
+    }
+
+    public bool OrphanPart(EntityUid? partId, BodyPartComponent? part = null)
+    {
+        if (partId == null || !Resolve(partId.Value, ref part, false))
+            return false;
+
+        DropPart(partId, part);
+
+        foreach (var slot in part.Children.Values)
+        {
+            DropPart(slot.Child);
+        }
+
+        return false;
+    }
+
+    public bool DeletePart(EntityUid? id, BodyPartComponent? part = null)
+    {
+        if (id == null || !Resolve(id.Value, ref part, false))
+            return false;
+
+        DropPart(id, part);
+
+        if (Deleted(id.Value))
+            return false;
+
+        Del(id.Value);
+        return true;
+    }
+
+    public IEnumerable<(EntityUid Id, BodyPartComponent Component)> GetBodyChildrenOfType(EntityUid? bodyId, BodyPartType type, BodyComponent? body = null)
+    {
+        foreach (var part in GetBodyChildren(bodyId, body))
+        {
+            if (part.Component.PartType == type)
+                yield return part;
+        }
+    }
+
+    public bool BodyHasChildOfType(EntityUid? bodyId, BodyPartType type, BodyComponent? body = null)
+    {
+        return GetBodyChildrenOfType(bodyId, type, body).Any();
+    }
+
+    public bool BodyHasChild(
+        EntityUid? parentId,
+        EntityUid? childId,
+        BodyComponent? parent = null,
+        BodyPartComponent? child = null)
+    {
+        if (parentId == null ||
+            !Resolve(parentId.Value, ref parent, false) ||
+            childId == null ||
+            !Resolve(childId.Value, ref child, false))
+            return false;
+
+        return child.ParentSlot?.Child == parentId;
+    }
+}

Content.Shared/Body/Systems/SharedBodySystem.cs

@@ -0,0 +1,26 @@
+using Content.Shared.Damage;
+using Content.Shared.Standing;
+using Robust.Shared.Containers;
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.Body.Systems;
+
+public abstract partial class SharedBodySystem : EntitySystem
+{
+    private const string BodyContainerId = "BodyContainer";
+
+    [Dependency] protected readonly IPrototypeManager Prototypes = default!;
+
+    [Dependency] protected readonly SharedContainerSystem Containers = default!;
+    [Dependency] protected readonly DamageableSystem Damageable = default!;
+    [Dependency] protected readonly StandingStateSystem Standing = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        InitializeBody();
+        InitializeParts();
+        InitializeOrgans();
+    }
+}

Content.Shared/Coordinates/EntityCoordinatesExtensions.cs

@@ -4,14 +4,19 @@ namespace Content.Shared.Coordinates
 {
     public static class EntityCoordinatesExtensions
     {
+        public static EntityCoordinates ToCoordinates(this EntityUid id)
+        {
+            return new EntityCoordinates(id, new Vector2(0, 0));
+        }
+
         public static EntityCoordinates ToCoordinates(this EntityUid id, Vector2 offset)
         {
-            return new(id, offset);
+            return new EntityCoordinates(id, offset);
         }
 
         public static EntityCoordinates ToCoordinates(this EntityUid id, float x, float y)
         {
-            return new(id, x, y);
+            return new EntityCoordinates(id, x, y);
         }
 
         public static EntityCoordinates ToCoordinates(this IMapGrid grid, Vector2 offset)

Content.Shared/Disposal/SharedDisposalUnitSystem.cs

@@ -6,9 +6,7 @@ using Content.Shared.MobState.Components;
 using Content.Shared.MobState.EntitySystems;
 using Content.Shared.Throwing;
 using JetBrains.Annotations;
-using Robust.Shared.Physics;
 using Robust.Shared.Physics.Components;
-using Robust.Shared.Physics.Dynamics;
 using Robust.Shared.Physics.Events;
 using Robust.Shared.Timing;
 
@@ -65,7 +63,7 @@ namespace Content.Shared.Disposal
 
             // TODO: Probably just need a disposable tag.
             if (!EntityManager.TryGetComponent(entity, out ItemComponent? storable) &&
-                !EntityManager.HasComponent<SharedBodyComponent>(entity))
+                !EntityManager.HasComponent<BodyComponent>(entity))
             {
                 return false;
             }

Content.Shared/Humanoid/HumanoidVisualLayersExtension.cs

@@ -60,7 +60,7 @@ namespace Content.Shared.Humanoid
             }
         }
 
-        public static HumanoidVisualLayers? ToHumanoidLayers(this SharedBodyPartComponent part)
+        public static HumanoidVisualLayers? ToHumanoidLayers(this BodyPartComponent part)
         {
             switch (part.PartType)
             {
@@ -85,6 +85,7 @@ namespace Content.Shared.Humanoid
                         case BodyPartSymmetry.Right:
                             return HumanoidVisualLayers.RArm;
                     }
+
                     break;
                 case BodyPartType.Hand:
                     switch (part.Symmetry)
@@ -96,6 +97,7 @@ namespace Content.Shared.Humanoid
                         case BodyPartSymmetry.Right:
                             return HumanoidVisualLayers.RHand;
                     }
+
                     break;
                 case BodyPartType.Leg:
                     switch (part.Symmetry)
@@ -107,6 +109,7 @@ namespace Content.Shared.Humanoid
                         case BodyPartSymmetry.Right:
                             return HumanoidVisualLayers.RLeg;
                     }
+
                     break;
                 case BodyPartType.Foot:
                     switch (part.Symmetry)
@@ -118,6 +121,7 @@ namespace Content.Shared.Humanoid
                         case BodyPartSymmetry.Right:
                             return HumanoidVisualLayers.RFoot;
                     }
+
                     break;
             }
 

Content.Shared/MedicalScanner/SharedMedicalScannerComponent.cs

@@ -25,7 +25,7 @@ namespace Content.Shared.MedicalScanner
 
         public bool CanInsert(EntityUid entity)
         {
-            return IoCManager.Resolve<IEntityManager>().HasComponent<SharedBodyComponent>(entity);
+            return IoCManager.Resolve<IEntityManager>().HasComponent<BodyComponent>(entity);
         }
 
         bool IDragDropOn.CanDragDropOn(DragDropEvent eventArgs)

Resources/Locale/en-US/body/behavior/reassemble.ftl

@@ -1,4 +0,0 @@
-reassemble-action = Reassemble
-reassemble-description = Reassemble the pieces of your body.
-reassemble-fail = Parts are missing!
-reassemble-success = {CAPITALIZE(THE($user))} was put back together.

Resources/Locale/en-US/body/components/bodypart-component.ftl

@@ -1,6 +0,0 @@
-## Entity
-
-bodypart-component-no-way-to-install-message = You see no way to install the {$partName}
-bodypart-component-no-way-to-attach-message = You see no useful way to attach the {$partName} anymore.
-bodypart-component-attach-success-message = You attach {$partName}
-bodypart-component-attach-fail-message = You can't attach {$partName}

Resources/Locale/en-US/body/components/mechanism-component.ftl

@@ -1,6 +0,0 @@
-## Entity
-
-mechanism-component-cannot-fit-message = You can't fit it in!
-mechanism-component-no-way-to-install-message = You see no way to install the {$partName}
-mechanism-component-no-useful-way-to-use-message = You see no useful way to use the {$partName} anymore.
-mechanism-component-jam-inside-message = You jam {$ownerName} inside {$them}.

Resources/Locale/en-US/body/surgery/biological-surgery-data-component.ftl

@@ -1,11 +0,0 @@
-biological-surgery-data-component-has-incision-not-clamped-message = The skin on their {$bodyPart} has an incision, but it is prone to bleeding.
-biological-surgery-data-component-has-clamped-incision-not-retracted-message = The skin on their {$bodyPart} has an incision, but it is not retracted.
-biological-surgery-data-component-has-fully-open-incision-message = There is an incision on their {$bodyPart}.
-biological-surgery-data-component-part-is-loose-message = {$owner}'s {$bodyPart} is loose.
-biological-surgery-data-component-open-skin-message = Cut open the skin...
-biological-surgery-data-component-clamp-vessels-message = Clamp the vessels...
-biological-surgery-data-component-retract-skin-message = Retracting the skin...
-biological-surgery-data-component-cauterize-incision-message = Cauterizing the incision...
-biological-surgery-data-component-loosen-organ-message = Loosening the organ...
-biological-surgery-data-component-remove-organ-message = Removing the organ...
-biological-surgery-data-component-remove-bodypart-message = Sawing off the limb!

Resources/Locale/en-US/body/surgery/components/surgery-tool-component.ftl

@@ -1,2 +0,0 @@
-surgery-tool-component-not-useful-message = You see no useful way to use {$bodyPart}.
-surgery-tool-component-not-useful-anymore-message = You see no useful way to use {$bodyPart} anymore.

Resources/Locale/en-US/body/surgery/surgery.ftl

@@ -1,4 +0,0 @@
-## UI
-
-surgery-window-title = Surgery
-surgery-window-not-available-button-text = N/A

Resources/Prototypes/Body/Mechanisms/tests.yml

@@ -1,23 +0,0 @@
-- type: entity
-  id: MechanismEMPStriker
-  name: "EMP striker"
-  description: "When activated, this arm implant will apply a small EMP on the target of a physical strike for 10 watts per use."
-  noSpawn: true
-  components:
-  - type: Sprite
-  - type: Icon
-  - type: Mechanism
-    size: 4
-    compatibility: Universal
-
-- type: entity
-  id: MechanismHonkModule
-  name: "HONK module 3000"
-  description: "Mandatory implant for all clowns after the Genevo Convention of 2459."
-  noSpawn: true
-  components:
-  - type: Sprite
-  - type: Icon
-  - type: Mechanism
-    size: 3
-    compatibility: Universal

Resources/Prototypes/Body/Organs/animal.yml

@@ -0,0 +1,90 @@
+- type: entity
+  id: BaseAnimalOrgan
+  parent: BaseItem
+  abstract: true
+  components:
+  - type: Organ
+  - type: Sprite
+    netsync: false
+    sprite: Mobs/Species/Human/organs.rsi
+  - type: StaticPrice
+    price: 50
+
+
+- type: entity
+  id: OrganAnimalLungs
+  parent: BaseAnimalOrgan
+  name: lungs
+  noSpawn: true
+  components:
+  - type: Organ
+  - type: Lung
+  - type: Metabolizer
+    removeEmpty: true
+    solutionOnBody: false
+    solution: "Lung"
+    metabolizerTypes: [ Animal ]
+    groups:
+    - id: Gas
+      rateModifier: 100.0
+
+- type: entity
+  id: OrganAnimalStomach
+  parent: BaseAnimalOrgan
+  name: stomach
+  noSpawn: true
+  components:
+  - type: Organ
+  - type: SolutionContainerManager
+    solutions:
+      stomach:
+        maxVol: 100
+  - type: Stomach
+    maxVolume: 10
+  - type: Metabolizer
+    maxReagents: 3
+    metabolizerTypes: [ Animal ]
+    groups:
+    - id: Food
+    - id: Drink
+
+- type: entity
+  id: OrganAnimalLiver
+  parent: BaseAnimalOrgan
+  name: liver
+  noSpawn: true
+  components:
+  - type: Organ
+  - type: Metabolizer
+    maxReagents: 1
+    metabolizerTypes: [ Animal ]
+    groups:
+    - id: Alcohol
+      rateModifier: 0.1
+
+- type: entity
+  id: OrganAnimalHeart
+  parent: BaseAnimalOrgan
+  name: heart
+  noSpawn: true
+  components:
+  - type: Organ
+  - type: Metabolizer
+    maxReagents: 2
+    metabolizerTypes: [ Animal ]
+    groups:
+    - id: Medicine
+    - id: Poison
+    - id: Narcotic
+
+- type: entity
+  id: OrganAnimalKidneys
+  parent: BaseAnimalOrgan
+  name: kidneys
+  noSpawn: true
+  components:
+  - type: Organ
+  - type: Metabolizer
+    maxReagents: 5
+    metabolizerTypes: [ Animal ]
+    removeEmpty: true

Resources/Prototypes/Body/Organs/human.yml

@@ -6,7 +6,7 @@
   - type: Sprite
     netsync: false
     sprite: Mobs/Species/Human/organs.rsi
-  - type: Mechanism
+  - type: Organ
   - type: Food
   - type: Extractable
     grindableSolutionName: organ
@@ -25,9 +25,7 @@
   components:
   - type: Sprite
     state: brain
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
+  - type: Organ
   - type: Input
     context: "ghost"
   - type: InputMover
@@ -47,9 +45,7 @@
     layers:
       - state: eyeball-l
       - state: eyeball-r
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
+  - type: Organ
 
 - type: entity
   id: OrganHumanTongue
@@ -59,9 +55,7 @@
   components:
   - type: Sprite
     state: tongue
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
+  - type: Organ
 
 - type: entity
   id: OrganHumanAppendix
@@ -73,9 +67,7 @@
     - state: appendix
     - state: appendix-inflamed
       visible: false
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
+  - type: Organ
 
 - type: entity
   id: OrganHumanEars
@@ -85,9 +77,7 @@
   components:
   - type: Sprite
     state: ears
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
+  - type: Organ
 
 - type: entity
   id: OrganHumanLungs
@@ -99,9 +89,7 @@
     layers:
       - state: lung-l
       - state: lung-r
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
+  - type: Organ
   - type: Lung
   - type: Metabolizer
     removeEmpty: true
@@ -120,9 +108,7 @@
   components:
   - type: Sprite
     state: heart-on
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
+  - type: Organ
   # The heart 'metabolizes' medicines and poisons that aren't filtered out by other organs.
   # This is done because these chemicals need to have some effect even if they aren't being filtered out of your body.
   # You're technically 'immune to poison' without a heart, but.. uhh, you'll have bigger problems on your hands.
@@ -142,9 +128,7 @@
   components:
   - type: Sprite
     state: stomach
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
+  - type: Organ
   - type: SolutionContainerManager
     solutions:
       stomach:
@@ -169,9 +153,7 @@
   components:
   - type: Sprite
     state: liver
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
+  - type: Organ
   - type: Metabolizer # The liver metabolizes certain chemicals only, like alcohol.
     maxReagents: 1
     metabolizerTypes: [Human]
@@ -189,9 +171,7 @@
     layers:
       - state: kidney-l
       - state: kidney-r
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
+  - type: Organ
   # The kidneys just remove anything that doesn't currently have any metabolisms, as a stopgap.
   - type: Metabolizer
     maxReagents: 5

Resources/Prototypes/Body/Organs/slime.yml

@@ -8,9 +8,7 @@
       netsync: false
       sprite: Mobs/Species/Human/organs.rsi
       state: brain
-    - type: Mechanism
-      size: 5
-      compatibility: Slime
+    - type: Organ
     - type: Brain
     - type: Stomach
     - type: Metabolizer
@@ -34,9 +32,7 @@
     layers:
       - state: lung-l
       - state: lung-r
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
+  - type: Organ
   - type: Lung
   - type: Metabolizer
     removeEmpty: true

Resources/Prototypes/Body/Parts/animal.yml

@@ -27,8 +27,6 @@
   components:
   - type: BodyPart
     partType: Hand
-    size: 1
-    compatibility: Biological
     symmetry: Left
 
 - type: entity
@@ -39,8 +37,6 @@
   components:
   - type: BodyPart
     partType: Leg
-    size: 1
-    compatibility: Biological
 
 - type: entity
   id: FeetAnimal
@@ -50,8 +46,6 @@
   components:
   - type: BodyPart
     partType: Foot
-    size: 1
-    compatibility: Biological
 
 - type: entity
   id: TorsoAnimal
@@ -61,113 +55,5 @@
   components:
   - type: BodyPart
     partType: Torso
-    size: 7
-    compatibility: Biological
-    mechanisms:
-    - OrganAnimalLungs
-    - OrganAnimalStomach
-    - OrganAnimalLiver
-    - OrganAnimalHeart
-    - OrganAnimalKidneys
   - type: Damageable
     damageContainer: Biological
-
-- type: entity
-  id: BaseAnimalOrgan
-  parent: BaseItem
-  abstract: true
-  components:
-  - type: Mechanism
-  - type: Sprite
-    netsync: false
-    sprite: Mobs/Species/Human/organs.rsi
-  - type: StaticPrice
-    price: 50
-
-- type: entity
-  id: OrganAnimalLungs
-  parent: BaseAnimalOrgan
-  name: lungs
-  noSpawn: true
-  components:
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
-  - type: Lung
-  - type: Metabolizer
-    removeEmpty: true
-    solutionOnBody: false
-    solution: "Lung"
-    metabolizerTypes: [ Animal ]
-    groups:
-    - id: Gas
-      rateModifier: 100.0
-
-- type: entity
-  id: OrganAnimalStomach
-  parent: BaseAnimalOrgan
-  name: stomach
-  noSpawn: true
-  components:
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
-  - type: SolutionContainerManager
-    solutions:
-      stomach:
-        maxVol: 100
-  - type: Stomach
-    maxVolume: 10
-  - type: Metabolizer
-    maxReagents: 3
-    metabolizerTypes: [Animal]
-    groups:
-    - id: Food
-    - id: Drink
-
-- type: entity
-  id: OrganAnimalLiver
-  parent: BaseAnimalOrgan
-  name: liver
-  noSpawn: true
-  components:
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
-  - type: Metabolizer
-    maxReagents: 1
-    metabolizerTypes: [Animal]
-    groups:
-    - id: Alcohol
-      rateModifier: 0.1
-
-- type: entity
-  id: OrganAnimalHeart
-  parent: BaseAnimalOrgan
-  name: heart
-  noSpawn: true
-  components:
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
-  - type: Metabolizer
-    maxReagents: 2
-    metabolizerTypes: [Animal]
-    groups:
-    - id: Medicine
-    - id: Poison
-    - id: Narcotic
-
-- type: entity
-  id: OrganAnimalKidneys
-  parent: BaseAnimalOrgan
-  name: kidneys
-  noSpawn: true
-  components:
-  - type: Mechanism
-    size: 1
-    compatibility: Biological
-  - type: Metabolizer
-    maxReagents: 5
-    metabolizerTypes: [Animal]
-    removeEmpty: true

Resources/Prototypes/Body/Parts/human.yml

@@ -30,16 +30,6 @@
     state: "torso_m"
   - type: BodyPart
     partType: Torso
-    size: 14
-    compatibility: Biological
-    mechanisms:
-    - OrganHumanHeart
-    - OrganHumanLungs
-    - OrganHumanStomach
-    - OrganHumanLiver
-    - OrganHumanKidneys
-#    criticalThreshold: 100
-#    deadThreshold: 150
 
 - type: entity
   id: HeadHuman
@@ -55,14 +45,7 @@
     state: "head_m"
   - type: BodyPart
     partType: Head
-    size: 7
-    compatibility: Biological
     vital: true
-    mechanisms:
-    - OrganHumanBrain
-    - OrganHumanEyes
-#    criticalThreshold: 50
-#    deadThreshold: 120
   - type: Input
     context: "ghost"
   - type: MovementSpeedModifier
@@ -88,11 +71,7 @@
     state: "l_arm"
   - type: BodyPart
     partType: Arm
-    size: 5
-    compatibility: Biological
     symmetry: Left
-#    criticalThreshold: 40
-#    deadThreshold: 80
 
 - type: entity
   id: RightArmHuman
@@ -108,11 +87,7 @@
     state: "r_arm"
   - type: BodyPart
     partType: Arm
-    size: 5
-    compatibility: Biological
     symmetry: Right
-#    criticalThreshold: 40
-#    deadThreshold: 80
 
 - type: entity
   id: LeftHandHuman
@@ -128,11 +103,7 @@
     state: "l_hand"
   - type: BodyPart
     partType: Hand
-    size: 3
-    compatibility: Biological
     symmetry: Left
-#    criticalThreshold: 30
-#    deadThreshold: 60
 
 - type: entity
   id: RightHandHuman
@@ -148,11 +119,7 @@
     state: "r_hand"
   - type: BodyPart
     partType: Hand
-    size: 3
-    compatibility: Biological
     symmetry: Right
-#    criticalThreshold: 30
-#    deadThreshold: 60
 
 - type: entity
   id: LeftLegHuman
@@ -168,11 +135,7 @@
     state: "l_leg"
   - type: BodyPart
     partType: Leg
-    size: 6
-    compatibility: Biological
     symmetry: Left
-#    criticalThreshold: 45
-#    deadThreshold: 90
 
 - type: entity
   id: RightLegHuman
@@ -188,11 +151,7 @@
     state: "r_leg"
   - type: BodyPart
     partType: Leg
-    size: 6
-    compatibility: Biological
     symmetry: Right
-#    criticalThreshold: 45
-#    deadThreshold: 90
 
 - type: entity
   id: LeftFootHuman
@@ -208,11 +167,7 @@
     state: "l_foot"
   - type: BodyPart
     partType: Foot
-    size: 2
-    compatibility: Biological
     symmetry: Left
-#    criticalThreshold: 30
-#    deadThreshold: 60
 
 - type: entity
   id: RightFootHuman
@@ -228,8 +183,4 @@
     state: "r_foot"
   - type: BodyPart
     partType: Foot
-    size: 2
-    compatibility: Biological
     symmetry: Right
-#    criticalThreshold: 30
-#    deadThreshold: 60

Resources/Prototypes/Body/Parts/rat.yml

@@ -8,13 +8,5 @@
   components:
   - type: BodyPart
     partType: Torso
-    size: 7
-    compatibility: Biological
-    mechanisms:
-    - OrganRatLungs
-    - OrganRatStomach
-    - OrganAnimalLiver
-    - OrganAnimalHeart
-    - OrganAnimalKidneys
   - type: Damageable
     damageContainer: Biological

Resources/Prototypes/Body/Parts/reptilian.yml

@@ -28,16 +28,6 @@
     state: "torso_m"
   - type: BodyPart
     partType: Torso
-    size: 14
-    compatibility: Biological
-    mechanisms:
-    - OrganAnimalHeart
-    - OrganHumanLungs
-    - OrganReptilianStomach
-    - OrganAnimalLiver
-    - OrganHumanKidneys
-#    criticalThreshold: 100
-#    deadThreshold: 150
 
 - type: entity
   id: HeadReptilian
@@ -53,14 +43,7 @@
     state: "head_m"
   - type: BodyPart
     partType: Head
-    size: 7
-    compatibility: Biological
     vital: true
-    mechanisms:
-    - OrganHumanBrain
-    - OrganHumanEyes
-#    criticalThreshold: 50
-#    deadThreshold: 120
   - type: Input
     context: "ghost"
   - type: MovementSpeedModifier
@@ -86,11 +69,7 @@
     state: "l_arm"
   - type: BodyPart
     partType: Arm
-    size: 5
-    compatibility: Biological
     symmetry: Left
-#    criticalThreshold: 40
-#    deadThreshold: 80
 
 - type: entity
   id: RightArmReptilian
@@ -106,11 +85,7 @@
     state: "r_arm"
   - type: BodyPart
     partType: Arm
-    size: 5
-    compatibility: Biological
     symmetry: Right
-#    criticalThreshold: 40
-#    deadThreshold: 80
 
 - type: entity
   id: LeftHandReptilian
@@ -126,11 +101,7 @@
     state: "l_hand"
   - type: BodyPart
     partType: Hand
-    size: 3
-    compatibility: Biological
     symmetry: Left
-#    criticalThreshold: 30
-#    deadThreshold: 60
 
 - type: entity
   id: RightHandReptilian
@@ -146,11 +117,7 @@
     state: "r_hand"
   - type: BodyPart
     partType: Hand
-    size: 3
-    compatibility: Biological
     symmetry: Right
-#    criticalThreshold: 30
-#    deadThreshold: 60
 
 - type: entity
   id: LeftLegReptilian
@@ -166,11 +133,7 @@
     state: "l_leg"
   - type: BodyPart
     partType: Leg
-    size: 6
-    compatibility: Biological
     symmetry: Left
-#    criticalThreshold: 45
-#    deadThreshold: 90
 
 - type: entity
   id: RightLegReptilian
@@ -186,11 +149,7 @@
     state: "r_leg"
   - type: BodyPart
     partType: Leg
-    size: 6
-    compatibility: Biological
     symmetry: Right
-#    criticalThreshold: 45
-#    deadThreshold: 90
 
 - type: entity
   id: LeftFootReptilian
@@ -206,11 +165,7 @@
     state: "l_foot"
   - type: BodyPart
     partType: Foot
-    size: 2
-    compatibility: Biological
     symmetry: Left
-#    criticalThreshold: 30
-#    deadThreshold: 60
 
 - type: entity
   id: RightFootReptilian
@@ -226,8 +181,4 @@
     state: "r_foot"
   - type: BodyPart
     partType: Foot
-    size: 2
-    compatibility: Biological
     symmetry: Right
-#    criticalThreshold: 30
-#    deadThreshold: 60

Resources/Prototypes/Body/Parts/silicon.yml

@@ -28,8 +28,6 @@
     state: "l_hand"
   - type: BodyPart
     partType: Hand
-    size: 3
-    compatibility: Biological ##Does this do anything? Revisit when surgery is in
     symmetry: Left
   - type: Tag
     tags:
@@ -51,8 +49,6 @@
     state: "r_hand"
   - type: BodyPart
     partType: Hand
-    size: 3
-    compatibility: Biological
     symmetry: Right
   - type: Tag
     tags:

Resources/Prototypes/Body/Parts/skeleton.yml

@@ -29,8 +29,6 @@
       state: "torso_m"
     - type: BodyPart
       partType: Torso
-      size: 14
-      compatibility: Biological
 
 - type: entity
   id: HeadSkeleton
@@ -47,8 +45,6 @@
       state: "skull_icon"
     - type: BodyPart
       partType: Head
-      size: 7
-      compatibility: Biological
     - type: Input
       context: "human"
     - type: MovementSpeedModifier
@@ -88,8 +84,6 @@
       state: "l_arm"
     - type: BodyPart
       partType: Arm
-      size: 5
-      compatibility: Biological
       symmetry: Left
 
 - type: entity
@@ -106,8 +100,6 @@
       state: "r_arm"
     - type: BodyPart
       partType: Arm
-      size: 5
-      compatibility: Biological
       symmetry: Right
 
 - type: entity
@@ -124,8 +116,6 @@
       state: "l_hand"
     - type: BodyPart
       partType: Hand
-      size: 3
-      compatibility: Biological
       symmetry: Left
 
 - type: entity
@@ -142,8 +132,6 @@
       state: "r_hand"
     - type: BodyPart
       partType: Hand
-      size: 3
-      compatibility: Biological
       symmetry: Right
 
 - type: entity
@@ -160,7 +148,7 @@
       state: "l_leg"
     - type: BodyPart
       partType: Leg
-      size: 6
+      symmetry: Left
 
 - type: entity
   id: RightLegSkeleton
@@ -176,8 +164,6 @@
       state: "r_leg"
     - type: BodyPart
       partType: Leg
-      size: 6
-      compatibility: Biological
       symmetry: Right
 
 - type: entity
@@ -194,8 +180,6 @@
       state: "l_foot"
     - type: BodyPart
       partType: Foot
-      size: 2
-      compatibility: Biological
       symmetry: Left
 
 - type: entity
@@ -212,6 +196,4 @@
       state: "r_foot"
     - type: BodyPart
       partType: Foot
-      size: 2
-      compatibility: Biological
       symmetry: Right

Resources/Prototypes/Body/Parts/slime.yml

@@ -29,13 +29,6 @@
       state: "torso_m"
     - type: BodyPart
       partType: Torso
-      size: 14
-      compatibility: Slime
-      mechanisms:
-        - SentientSlimeCore
-        - OrganSlimeLungs
-#    criticalThreshold: 100
-#    deadThreshold: 150
 
 - type: entity
   id: HeadSlime
@@ -51,11 +44,7 @@
       state: "head_m"
     - type: BodyPart
       partType: Head
-      size: 7
-      compatibility: Slime
       vital: true
-    #    criticalThreshold: 50
-    #    deadThreshold: 120
     - type: Input
       context: "ghost"
     - type: MovementSpeedModifier
@@ -81,11 +70,7 @@
       state: "l_arm"
     - type: BodyPart
       partType: Arm
-      size: 5
-      compatibility: Slime
       symmetry: Left
-    #    criticalThreshold: 40
-    #    deadThreshold: 80
 
 - type: entity
   id: RightArmSlime
@@ -101,11 +86,7 @@
       state: "r_arm"
     - type: BodyPart
       partType: Arm
-      size: 5
-      compatibility: Slime
       symmetry: Right
-    #    criticalThreshold: 40
-    #    deadThreshold: 80
 
 - type: entity
   id: LeftHandSlime
@@ -121,11 +102,7 @@
       state: "l_hand"
     - type: BodyPart
       partType: Hand
-      size: 3
-      compatibility: Slime
       symmetry: Left
-    #    criticalThreshold: 30
-    #    deadThreshold: 60
 
 - type: entity
   id: RightHandSlime
@@ -141,11 +118,7 @@
       state: "r_hand"
     - type: BodyPart
       partType: Hand
-      size: 3
-      compatibility: Slime
       symmetry: Right
-    #    criticalThreshold: 30
-    #    deadThreshold: 60
 
 - type: entity
   id: LeftLegSlime
@@ -161,8 +134,6 @@
       state: "l_leg"
     - type: BodyPart
       partType: Leg
-      size: 6
-      compatibility: Slime
       symmetry: Left
 
 - type: entity
@@ -179,11 +150,7 @@
       state: "r_leg"
     - type: BodyPart
       partType: Leg
-      size: 6
-      compatibility: Slime
       symmetry: Right
-    #    criticalThreshold: 45
-    #    deadThreshold: 90
 
 - type: entity
   id: LeftFootSlime
@@ -199,11 +166,7 @@
       state: "l_foot"
     - type: BodyPart
       partType: Foot
-      size: 2
-      compatibility: Slime
       symmetry: Left
-#    criticalThreshold: 30
-#    deadThreshold: 60
 
 - type: entity
   id: RightFootSlime
@@ -219,8 +182,4 @@
       state: "r_foot"
     - type: BodyPart
       partType: Foot
-      size: 2
-      compatibility: Slime
       symmetry: Right
-#    criticalThreshold: 30
-#    deadThreshold: 60

Resources/Prototypes/Body/Parts/vox.yml

@@ -30,17 +30,6 @@
       state: "torso_m"
     - type: BodyPart
       partType: Torso
-      size: 14
-      compatibility: Biological
-      mechanisms:
-        - OrganHumanHeart
-        - OrganVoxLungs
-        - OrganHumanStomach
-        - OrganHumanLiver
-        - OrganHumanKidneys
-      # TODO BODY DettachableDamageableComponent?
-#    criticalThreshold: 100
-#    deadThreshold: 150
 
 - type: entity
   id: HeadVox
@@ -56,14 +45,7 @@
       state: "head_m"
     - type: BodyPart
       partType: Head
-      size: 7
-      compatibility: Biological
       vital: true
-      mechanisms:
-        - OrganHumanBrain
-        - OrganHumanEyes
-    #    criticalThreshold: 50
-    #    deadThreshold: 120
     - type: Input
       context: "ghost"
     - type: MovementSpeedModifier
@@ -89,11 +71,7 @@
       state: "l_arm"
     - type: BodyPart
       partType: Arm
-      size: 5
-      compatibility: Biological
       symmetry: Left
-    #    criticalThreshold: 40
-    #    deadThreshold: 80
 
 - type: entity
   id: RightArmVox
@@ -109,11 +87,7 @@
       state: "r_arm"
     - type: BodyPart
       partType: Arm
-      size: 5
-      compatibility: Biological
       symmetry: Right
-    #    criticalThreshold: 40
-    #    deadThreshold: 80
 
 - type: entity
   id: LeftHandVox
@@ -129,11 +103,7 @@
       state: "l_hand"
     - type: BodyPart
       partType: Hand
-      size: 3
-      compatibility: Biological
       symmetry: Left
-    #    criticalThreshold: 30
-    #    deadThreshold: 60
 
 - type: entity
   id: RightHandVox
@@ -149,11 +119,7 @@
       state: "r_hand"
     - type: BodyPart
       partType: Hand
-      size: 3
-      compatibility: Biological
       symmetry: Right
-    #    criticalThreshold: 30
-    #    deadThreshold: 60
 
 - type: entity
   id: LeftLegVox
@@ -169,11 +135,7 @@
       state: "l_leg"
     - type: BodyPart
       partType: Leg
-      size: 6
-      compatibility: Biological
       symmetry: Left
-    #    criticalThreshold: 45
-    #    deadThreshold: 90
 
 - type: entity
   id: RightLegVox
@@ -189,11 +151,7 @@
       state: "r_leg"
     - type: BodyPart
       partType: Leg
-      size: 6
-      compatibility: Biological
       symmetry: Right
-    #    criticalThreshold: 45
-    #    deadThreshold: 90
 
 - type: entity
   id: LeftFootVox
@@ -209,11 +167,7 @@
       state: "l_foot"
     - type: BodyPart
       partType: Foot
-      size: 2
-      compatibility: Biological
       symmetry: Left
-#    criticalThreshold: 30
-#    deadThreshold: 60
 
 - type: entity
   id: RightFootVox
@@ -229,8 +183,4 @@
       state: "r_foot"
     - type: BodyPart
       partType: Foot
-      size: 2
-      compatibility: Biological
       symmetry: Right
-#    criticalThreshold: 30
-#    deadThreshold: 60