Pie transfer reagent on collision (#7802)

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/Chemistry/Components/SolutionInjectOnCollideComponent.cs

@@ -1,6 +1,7 @@
 using System;
 using Content.Shared.Chemistry.Reagent;
 using Content.Shared.FixedPoint;
+using Content.Shared.Inventory;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization.Manager.Attributes;
 using Robust.Shared.ViewVariables;
@@ -23,5 +24,11 @@ namespace Content.Server.Chemistry.Components
 
         [DataField("transferEfficiency")]
         private float _transferEfficiency = 1f;
+
+        /// <summary>
+        /// If anything covers any of these slots then the injection fails.
+        /// </summary>
+        [DataField("blockSlots"), ViewVariables(VVAccess.ReadWrite)]
+        public SlotFlags BlockSlots = SlotFlags.MASK;
     }
 }

Content.Server/Chemistry/EntitySystems/SolutionInjectOnCollideSystem.cs

@@ -2,18 +2,22 @@ using Content.Server.Body.Components;
 using Content.Server.Body.Systems;
 using Content.Server.Chemistry.Components;
 using Content.Server.Chemistry.Components.SolutionManager;
+using Content.Server.Nutrition.EntitySystems;
+using Content.Shared.Inventory;
 using JetBrains.Annotations;
-using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
 using Robust.Shared.Physics.Dynamics;
+using Robust.Shared.Prototypes;
+
 
 namespace Content.Server.Chemistry.EntitySystems
 {
     [UsedImplicitly]
     internal sealed class SolutionInjectOnCollideSystem : EntitySystem
     {
+        [Dependency] private readonly IPrototypeManager _protoManager = default!;
         [Dependency] private readonly SolutionContainerSystem _solutionsSystem = default!;
         [Dependency] private readonly BloodstreamSystem _bloodstreamSystem = default!;
+        [Dependency] private readonly InventorySystem _inventorySystem = default!;
 
         public override void Initialize()
         {
@@ -30,15 +34,29 @@ namespace Content.Server.Chemistry.EntitySystems
 
         private void HandleInjection(EntityUid uid, SolutionInjectOnCollideComponent component, StartCollideEvent args)
         {
-            if (!EntityManager.TryGetComponent<BloodstreamComponent?>(args.OtherFixture.Body.Owner, out var bloodstream) ||
+            var target = args.OtherFixture.Body.Owner;
+
+            if (!args.OtherFixture.Body.Hard ||
+                !EntityManager.TryGetComponent<BloodstreamComponent>(target, out var bloodstream) ||
                 !_solutionsSystem.TryGetInjectableSolution(component.Owner, out var solution)) return;
 
+            if (component.BlockSlots != 0x0 && TryComp<InventoryComponent>(target, out var inventory))
+            {
+                var containerEnumerator = new InventorySystem.ContainerSlotEnumerator(target, inventory.TemplateId, _protoManager, _inventorySystem, component.BlockSlots);
+
+                while (containerEnumerator.MoveNext(out var container))
+                {
+                    if (!container.ContainedEntity.HasValue) continue;
+                    return;
+                }
+            }
+
             var solRemoved = solution.SplitSolution(component.TransferAmount);
             var solRemovedVol = solRemoved.TotalVolume;
 
             var solToInject = solRemoved.SplitSolution(solRemovedVol * component.TransferEfficiency);
 
-            _bloodstreamSystem.TryAddToChemicals((args.OtherFixture.Body).Owner, solToInject, bloodstream);
+            _bloodstreamSystem.TryAddToChemicals(target, solToInject, bloodstream);
         }
     }
 }

Resources/Prototypes/Entities/Objects/Consumable/Food/Baked/pie.yml

@@ -114,6 +114,9 @@
     - state: tin
     - state: plain
   - type: CreamPie
+  - type: SolutionInjectOnCollide
+    transferAmount: 20
+    transferEfficiency: 0.2
 # Tastes like pie, cream, banana.
 
 - type: entity