Stripping (#1668)

* Start work on stripping.

* more strippable work

* Stripping works

* Nullable

* MORE NULLABLE

* nullable moment

* life is pain

* Interaction check.

* Update Content.Client/GameObjects/Components/HUD/Inventory/StrippableBoundUserInterface.cs

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Update Content.Client/GameObjects/Components/HUD/Inventory/StrippableBoundUserInterface.cs

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Update Content.Server/GameObjects/Components/GUI/HandsComponent.cs

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Update Content.Server/GameObjects/Components/GUI/HandsComponent.cs

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Update Content.Server/GameObjects/Components/GUI/HandsComponent.cs

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Update Content.Server/GameObjects/Components/GUI/StrippableComponent.cs

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Update Content.Server/GameObjects/Components/GUI/StrippableComponent.cs

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Update Content.Server/GameObjects/Components/GUI/HandsComponent.cs

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Update Content.Server/GameObjects/Components/GUI/StrippableComponent.cs

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Update Content.Server/GameObjects/Components/GUI/StrippableComponent.cs

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Update Content.Shared/GameObjects/Components/GUI/SharedStrippableComponent.cs

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Update Content.Server/GameObjects/Components/GUI/StrippableComponent.cs

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Rename InventoryComponent and HandsComponent's OnChanged event to OnItemChanged

* Apply suggestions from code review

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Use static EquipmentSlotDefines

* Do not expose ContainerSlot on Inventory or Hands.

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

Content.Client/GameObjects/Components/GUI/StrippableComponent.cs

@@ -0,0 +1,22 @@
+using Content.Client.GameObjects.Components.Items;
+using Content.Client.Interfaces.GameObjects.Components.Interaction;
+using Content.Shared.GameObjects.Components.GUI;
+using Robust.Shared.GameObjects;
+
+namespace Content.Client.GameObjects.Components.GUI
+{
+    [RegisterComponent]
+    public class StrippableComponent : SharedStrippableComponent, IClientDraggable
+    {
+        public bool ClientCanDropOn(CanDropEventArgs eventArgs)
+        {
+            return eventArgs.Target.HasComponent<HandsComponent>()
+                   && eventArgs.Target != eventArgs.Dragged && eventArgs.Target == eventArgs.User;
+        }
+
+        public bool ClientCanDrag(CanDragEventArgs eventArgs)
+        {
+            return true;
+        }
+    }
+}

Content.Client/GameObjects/Components/HUD/Inventory/StrippableBoundUserInterface.cs

@@ -0,0 +1,81 @@
+using System.Collections.Generic;
+using Content.Client.UserInterface;
+using Content.Shared.GameObjects.Components.GUI;
+using Content.Shared.GameObjects.Components.Inventory;
+using JetBrains.Annotations;
+using Robust.Client.GameObjects.Components.UserInterface;
+using Robust.Shared.GameObjects.Components.UserInterface;
+using Robust.Shared.ViewVariables;
+using static Content.Shared.GameObjects.Components.Inventory.EquipmentSlotDefines;
+
+namespace Content.Client.GameObjects.Components.HUD.Inventory
+{
+    [UsedImplicitly]
+    public class StrippableBoundUserInterface : BoundUserInterface
+    {
+        public Dictionary<Slots, string> Inventory { get; private set; }
+        public Dictionary<string, string> Hands { get; private set; }
+
+        [ViewVariables]
+        private StrippingMenu _strippingMenu;
+
+        public StrippableBoundUserInterface(ClientUserInterfaceComponent owner, object uiKey) : base(owner, uiKey)
+        {
+        }
+
+        protected override void Open()
+        {
+            base.Open();
+
+            _strippingMenu = new StrippingMenu($"{Owner.Owner.Name}'s inventory");
+            _strippingMenu.OpenCentered();
+            UpdateMenu();
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            base.Dispose(disposing);
+            if (!disposing) return;
+            _strippingMenu.Dispose();
+
+            _strippingMenu.Close();
+        }
+
+        private void UpdateMenu()
+        {
+            if (_strippingMenu == null) return;
+
+            _strippingMenu.ClearButtons();
+
+            if(Inventory != null)
+                foreach (var (slot, name) in Inventory)
+                {
+                    _strippingMenu.AddButton(EquipmentSlotDefines.SlotNames[slot], name, (ev) =>
+                    {
+                        SendMessage(new StrippingInventoryButtonPressed(slot));
+                    });
+                }
+
+            if(Hands != null)
+                foreach (var (hand, name) in Hands)
+                {
+                    _strippingMenu.AddButton(hand, name, (ev) =>
+                    {
+                        SendMessage(new StrippingHandButtonPressed(hand));
+                    });
+                }
+        }
+
+        protected override void UpdateState(BoundUserInterfaceState state)
+        {
+            base.UpdateState(state);
+
+            if (!(state is StrippingBoundUserInterfaceState stripState)) return;
+
+            Inventory = stripState.Inventory;
+            Hands = stripState.Hands;
+
+            UpdateMenu();
+        }
+    }
+}

Content.Client/GameObjects/Components/Items/HandsComponent.cs

@@ -23,6 +23,7 @@ namespace Content.Client.GameObjects.Components.Items
         [Dependency] private readonly IGameHud _gameHud = default!;
 #pragma warning restore 649
 
+        /// <inheritdoc />
         private readonly List<Hand> _hands = new List<Hand>();
 
         [ViewVariables] public IReadOnlyList<Hand> Hands => _hands;

Content.Client/UserInterface/StrippingMenu.cs

@@ -0,0 +1,64 @@
+using System;
+using Content.Client.UserInterface.Stylesheets;
+using Robust.Client.UserInterface;
+using Robust.Client.UserInterface.Controls;
+using Robust.Client.UserInterface.CustomControls;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+
+namespace Content.Client.UserInterface
+{
+    public class StrippingMenu : SS14Window
+    {
+        protected override Vector2? CustomSize => new Vector2(400, 600);
+
+        private readonly VBoxContainer _vboxContainer;
+
+        public StrippingMenu(string title)
+        {
+            Title = title;
+
+            _vboxContainer = new VBoxContainer()
+            {
+                SizeFlagsVertical = SizeFlags.FillExpand,
+                SeparationOverride = 5,
+            };
+
+            Contents.AddChild(_vboxContainer);
+        }
+
+        public void ClearButtons()
+        {
+            _vboxContainer.DisposeAllChildren();
+        }
+
+        public void AddButton(string title, string name, Action<BaseButton.ButtonEventArgs> onPressed)
+        {
+            var button = new Button()
+            {
+                Text = name,
+                StyleClasses = { StyleBase.ButtonOpenRight }
+            };
+
+            button.OnPressed += onPressed;
+
+            _vboxContainer.AddChild(new HBoxContainer()
+            {
+                SizeFlagsHorizontal = SizeFlags.FillExpand,
+                SeparationOverride = 5,
+                Children =
+                {
+                    new Label()
+                    {
+                        Text = $"{title}:"
+                    },
+                    new Control()
+                    {
+                        SizeFlagsHorizontal = SizeFlags.FillExpand
+                    },
+                    button,
+                }
+            });
+        }
+    }
+}

Content.Server/GameObjects/Components/GUI/HandsComponent.cs

@@ -42,6 +42,8 @@ namespace Content.Server.GameObjects.Components.GUI
         private string? _activeHand;
         private uint _nextHand;
 
+        public event Action? OnItemChanged;
+
         [ViewVariables(VVAccess.ReadWrite)]
         public string? ActiveHand
         {
@@ -60,6 +62,8 @@ namespace Content.Server.GameObjects.Components.GUI
 
         [ViewVariables] private readonly List<Hand> _hands = new List<Hand>();
 
+        public IEnumerable<string> Hands => _hands.Select(h => h.Name);
+
         // Mostly arbitrary.
         public const float PickupRange = 2;
 
@@ -105,6 +109,12 @@ namespace Content.Server.GameObjects.Components.GUI
             return GetHand(handName)?.Entity?.GetComponent<ItemComponent>();
         }
 
+        public bool TryGetItem(string handName, [MaybeNullWhen(false)] out ItemComponent item)
+        {
+            item = GetItem(handName);
+            return item != null;
+        }
+
         public ItemComponent? GetActiveHand => ActiveHand == null
             ? null
             : GetItem(ActiveHand);
@@ -136,6 +146,8 @@ namespace Content.Server.GameObjects.Components.GUI
             {
                 if (PutInHand(item, hand, false))
                 {
+                    OnItemChanged?.Invoke();
+
                     return true;
                 }
             }
@@ -156,6 +168,7 @@ namespace Content.Server.GameObjects.Components.GUI
             if (success)
             {
                 item.Owner.Transform.LocalPosition = Vector2.Zero;
+                OnItemChanged?.Invoke();
             }
 
             _entitySystemManager.GetEntitySystem<InteractionSystem>().HandSelectedInteraction(Owner, item.Owner);
@@ -250,6 +263,8 @@ namespace Content.Server.GameObjects.Components.GUI
                 container.Insert(item.Owner);
             }
 
+            OnItemChanged?.Invoke();
+
             Dirty();
             return true;
         }
@@ -300,6 +315,8 @@ namespace Content.Server.GameObjects.Components.GUI
                 container.Insert(item.Owner);
             }
 
+            OnItemChanged?.Invoke();
+
             Dirty();
             return true;
         }
@@ -364,6 +381,8 @@ namespace Content.Server.GameObjects.Components.GUI
                 throw new InvalidOperationException();
             }
 
+            OnItemChanged?.Invoke();
+
             Dirty();
             return true;
         }
@@ -415,6 +434,8 @@ namespace Content.Server.GameObjects.Components.GUI
 
             ActiveHand ??= name;
 
+            OnItemChanged?.Invoke();
+
             Dirty();
         }
 
@@ -435,6 +456,8 @@ namespace Content.Server.GameObjects.Components.GUI
                 _activeHand = _hands.FirstOrDefault()?.Name;
             }
 
+            OnItemChanged?.Invoke();
+
             Dirty();
         }
 
@@ -645,7 +668,7 @@ namespace Content.Server.GameObjects.Components.GUI
 
                 Dirty();
 
-                if (!message.Entity.TryGetComponent(out IPhysicsComponent physics))
+                if (!message.Entity.TryGetComponent(out ICollidableComponent physics))
                 {
                     return;
                 }

Content.Server/GameObjects/Components/GUI/InventoryComponent.cs

@@ -33,9 +33,13 @@ namespace Content.Server.GameObjects.Components.GUI
 #pragma warning restore 649
 
         [ViewVariables]
-        private readonly Dictionary<Slots, ContainerSlot> SlotContainers = new Dictionary<Slots, ContainerSlot>();
+        private readonly Dictionary<Slots, ContainerSlot> _slotContainers = new Dictionary<Slots, ContainerSlot>();
 
-        private KeyValuePair<Slots, (EntityUid entity, bool fits)>? HoverEntity;
+        private KeyValuePair<Slots, (EntityUid entity, bool fits)>? _hoverEntity;
+
+        public IEnumerable<Slots> Slots => _slotContainers.Keys;
+
+        public event Action OnItemChanged;
 
         public override void Initialize()
         {
@@ -43,7 +47,7 @@ namespace Content.Server.GameObjects.Components.GUI
 
             foreach (var slotName in InventoryInstance.SlotMasks)
             {
-                if (slotName != Slots.NONE)
+                if (slotName != EquipmentSlotDefines.Slots.NONE)
                 {
                     AddSlot(slotName);
                 }
@@ -58,7 +62,7 @@ namespace Content.Server.GameObjects.Components.GUI
             {
                 var multiplier = 1f;
 
-                foreach (var (slot, containerSlot) in SlotContainers)
+                foreach (var (slot, containerSlot) in _slotContainers)
                 {
                     foreach (var entity in containerSlot.ContainedEntities)
                     {
@@ -81,7 +85,7 @@ namespace Content.Server.GameObjects.Components.GUI
             {
                 var multiplier = 1f;
 
-                foreach (var (slot, containerSlot) in SlotContainers)
+                foreach (var (slot, containerSlot) in _slotContainers)
                 {
                     foreach (var entity in containerSlot.ContainedEntities)
                     {
@@ -99,7 +103,7 @@ namespace Content.Server.GameObjects.Components.GUI
         bool IEffectBlocker.CanSlip()
         {
             if(Owner.TryGetComponent(out InventoryComponent inventoryComponent) &&
-                inventoryComponent.TryGetSlotItem(Slots.SHOES, out ItemComponent shoes)
+                inventoryComponent.TryGetSlotItem(EquipmentSlotDefines.Slots.SHOES, out ItemComponent shoes)
             )
             {
                 return EffectBlockerSystem.CanSlip(shoes.Owner);
@@ -110,7 +114,7 @@ namespace Content.Server.GameObjects.Components.GUI
 
         public override void OnRemove()
         {
-            var slots = SlotContainers.Keys.ToList();
+            var slots = _slotContainers.Keys.ToList();
             foreach (var slot in slots)
             {
                 RemoveSlot(slot);
@@ -140,15 +144,15 @@ namespace Content.Server.GameObjects.Components.GUI
         }
         public T GetSlotItem<T>(Slots slot) where T : ItemComponent
         {
-            if (!SlotContainers.ContainsKey(slot))
+            if (!_slotContainers.ContainsKey(slot))
             {
                 return null;
             }
 
-            var containedEntity = SlotContainers[slot].ContainedEntity;
+            var containedEntity = _slotContainers[slot].ContainedEntity;
             if (containedEntity?.Deleted == true)
             {
-                SlotContainers[slot] = null;
+                _slotContainers[slot] = null;
                 containedEntity = null;
                 Dirty();
             }
@@ -169,7 +173,7 @@ namespace Content.Server.GameObjects.Components.GUI
         /// </remarks>
         /// <param name="slot">The slot to put the item in.</param>
         /// <param name="item">The item to insert into the slot.</param>
-        /// <param name="reason">The translated reason why the item cannot be equiped, if this function returns false. Can be null.</param>
+        /// <param name="reason">The translated reason why the item cannot be equipped, if this function returns false. Can be null.</param>
         /// <returns>True if the item was successfully inserted, false otherwise.</returns>
         public bool Equip(Slots slot, ItemComponent item, out string reason)
         {
@@ -184,7 +188,7 @@ namespace Content.Server.GameObjects.Components.GUI
                 return false;
             }
 
-            var inventorySlot = SlotContainers[slot];
+            var inventorySlot = _slotContainers[slot];
             if (!inventorySlot.Insert(item.Owner))
             {
                 return false;
@@ -192,6 +196,8 @@ namespace Content.Server.GameObjects.Components.GUI
 
             _entitySystemManager.GetEntitySystem<InteractionSystem>().EquippedInteraction(Owner, item.Owner, slot);
 
+            OnItemChanged?.Invoke();
+
             Dirty();
 
             return true;
@@ -239,7 +245,7 @@ namespace Content.Server.GameObjects.Components.GUI
                 reason = Loc.GetString("You can't equip this!");
             }
 
-            return pass && SlotContainers[slot].CanInsert(item.Owner);
+            return pass && _slotContainers[slot].CanInsert(item.Owner);
         }
 
         public bool CanEquip(Slots slot, ItemComponent item) => CanEquip(slot, item, out var _);
@@ -258,7 +264,7 @@ namespace Content.Server.GameObjects.Components.GUI
                 return false;
             }
 
-            var inventorySlot = SlotContainers[slot];
+            var inventorySlot = _slotContainers[slot];
             var item = inventorySlot.ContainedEntity.GetComponent<ItemComponent>();
             if (!inventorySlot.Remove(inventorySlot.ContainedEntity))
             {
@@ -271,6 +277,8 @@ namespace Content.Server.GameObjects.Components.GUI
 
             _entitySystemManager.GetEntitySystem<InteractionSystem>().UnequippedInteraction(Owner, item.Owner, slot);
 
+            OnItemChanged?.Invoke();
+
             Dirty();
 
             return true;
@@ -288,7 +296,7 @@ namespace Content.Server.GameObjects.Components.GUI
             if (!ActionBlockerSystem.CanUnequip(Owner))
                 return false;
 
-            var InventorySlot = SlotContainers[slot];
+            var InventorySlot = _slotContainers[slot];
             return InventorySlot.ContainedEntity != null && InventorySlot.CanRemove(InventorySlot.ContainedEntity);
         }
 
@@ -307,7 +315,12 @@ namespace Content.Server.GameObjects.Components.GUI
             }
 
             Dirty();
-            return SlotContainers[slot] = ContainerManagerComponent.Create<ContainerSlot>(GetSlotString(slot), Owner);
+
+            _slotContainers[slot] = ContainerManagerComponent.Create<ContainerSlot>(GetSlotString(slot), Owner);
+
+            OnItemChanged?.Invoke();
+
+            return _slotContainers[slot];
         }
 
         /// <summary>
@@ -331,7 +344,10 @@ namespace Content.Server.GameObjects.Components.GUI
                     "Unable to remove slot as the contained clothing could not be dropped");
             }
 
-            SlotContainers.Remove(slot);
+            _slotContainers.Remove(slot);
+
+            OnItemChanged?.Invoke();
+
             Dirty();
         }
 
@@ -342,7 +358,7 @@ namespace Content.Server.GameObjects.Components.GUI
         /// <returns>True if the slot exists, false otherwise.</returns>
         public bool HasSlot(Slots slot)
         {
-            return SlotContainers.ContainsKey(slot);
+            return _slotContainers.ContainsKey(slot);
         }
 
         /// <summary>
@@ -354,7 +370,7 @@ namespace Content.Server.GameObjects.Components.GUI
             // make sure this is one of our containers.
             // Technically the correct way would be to enumerate the possible slot names
             // comparing with this container, but I might as well put the dictionary to good use.
-            if (!(container is ContainerSlot slot) || !SlotContainers.ContainsValue(slot))
+            if (!(container is ContainerSlot slot) || !_slotContainers.ContainsValue(slot))
                 return;
 
             if (entity.TryGetComponent(out ItemComponent itemComp))
@@ -362,6 +378,8 @@ namespace Content.Server.GameObjects.Components.GUI
                 itemComp.RemovedFromSlot();
             }
 
+            OnItemChanged?.Invoke();
+
             Dirty();
         }
 
@@ -417,7 +435,7 @@ namespace Content.Server.GameObjects.Components.GUI
                     if (activeHand != null && GetSlotItem(msg.Inventoryslot) == null)
                     {
                         var canEquip = CanEquip(msg.Inventoryslot, activeHand, out var reason);
-                        HoverEntity = new KeyValuePair<Slots, (EntityUid entity, bool fits)>(msg.Inventoryslot, (activeHand.Owner.Uid, canEquip));
+                        _hoverEntity = new KeyValuePair<Slots, (EntityUid entity, bool fits)>(msg.Inventoryslot, (activeHand.Owner.Uid, canEquip));
 
                         Dirty();
                     }
@@ -476,7 +494,7 @@ namespace Content.Server.GameObjects.Components.GUI
         public override ComponentState GetComponentState()
         {
             var list = new List<KeyValuePair<Slots, EntityUid>>();
-            foreach (var (slot, container) in SlotContainers)
+            foreach (var (slot, container) in _slotContainers)
             {
                 if (container.ContainedEntity != null)
                 {
@@ -484,8 +502,8 @@ namespace Content.Server.GameObjects.Components.GUI
                 }
             }
 
-            var hover = HoverEntity;
+            var hover = _hoverEntity;
-            HoverEntity = null;
+            _hoverEntity = null;
 
             return new InventoryComponentState(list, hover);
         }
@@ -497,7 +515,7 @@ namespace Content.Server.GameObjects.Components.GUI
                 return;
             }
 
-            foreach (var slot in SlotContainers.Values.ToList())
+            foreach (var slot in _slotContainers.Values.ToList())
             {
                 foreach (var entity in slot.ContainedEntities)
                 {

Content.Server/GameObjects/Components/GUI/StrippableComponent.cs

@@ -0,0 +1,372 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using Content.Server.GameObjects.Components.Items.Storage;
+using Content.Server.GameObjects.EntitySystems.DoAfter;
+using Content.Server.Interfaces;
+using Content.Shared.GameObjects.Components.GUI;
+using Content.Shared.GameObjects.Components.Inventory;
+using Content.Shared.GameObjects.EntitySystems;
+using Content.Shared.Interfaces.GameObjects.Components;
+using Robust.Server.GameObjects.Components.UserInterface;
+using Robust.Server.Interfaces.GameObjects;
+using Robust.Server.Interfaces.Player;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameObjects.Systems;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Localization;
+using Robust.Shared.Log;
+using Robust.Shared.ViewVariables;
+using static Content.Shared.GameObjects.Components.Inventory.EquipmentSlotDefines;
+
+namespace Content.Server.GameObjects.Components.GUI
+{
+    [RegisterComponent]
+    public sealed class StrippableComponent : SharedStrippableComponent, IDragDrop
+    {
+        [Dependency] private IServerNotifyManager _notifyManager = default!;
+
+        public const float StripDelay = 2f;
+
+        [ViewVariables]
+        private BoundUserInterface _userInterface;
+
+        private InventoryComponent _inventoryComponent;
+        private HandsComponent _handsComponent;
+
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            _userInterface = Owner.GetComponent<ServerUserInterfaceComponent>().GetBoundUserInterface(StrippingUiKey.Key);
+            _userInterface.OnReceiveMessage += HandleUserInterfaceMessage;
+
+            _inventoryComponent = Owner.GetComponent<InventoryComponent>();
+            _handsComponent = Owner.GetComponent<HandsComponent>();
+
+            _inventoryComponent.OnItemChanged += UpdateSubscribed;
+
+            // Initial update.
+            UpdateSubscribed();
+        }
+
+        private void UpdateSubscribed()
+        {
+            var inventory = GetInventorySlots();
+            var hands = GetHandSlots();
+
+            _userInterface.SetState(new StrippingBoundUserInterfaceState(inventory, hands));
+        }
+
+        public bool CanDragDrop(DragDropEventArgs eventArgs)
+        {
+            return eventArgs.User.HasComponent<HandsComponent>()
+                   && eventArgs.Target != eventArgs.Dropped && eventArgs.Target == eventArgs.User;
+        }
+
+        public bool DragDrop(DragDropEventArgs eventArgs)
+        {
+            if (!eventArgs.User.TryGetComponent(out IActorComponent actor)) return false;
+
+            OpenUserInterface(actor.playerSession);
+            return true;
+        }
+
+        private Dictionary<Slots, string> GetInventorySlots()
+        {
+            var dictionary = new Dictionary<Slots, string>();
+
+            foreach (var slot in _inventoryComponent.Slots)
+            {
+                dictionary[slot] = _inventoryComponent.GetSlotItem(slot)?.Owner.Name ?? "None";
+            }
+
+            return dictionary;
+        }
+
+        private Dictionary<string, string> GetHandSlots()
+        {
+            var dictionary = new Dictionary<string, string>();
+
+            foreach (var hand in _handsComponent.Hands)
+            {
+                dictionary[hand] = _handsComponent.GetItem(hand)?.Owner.Name ?? "None";
+            }
+
+            return dictionary;
+        }
+
+        private void OpenUserInterface(IPlayerSession session)
+        {
+            _userInterface.Open(session);
+        }
+
+        /// <summary>
+        ///     Places item in user's active hand to an inventory slot.
+        /// </summary>
+        private async void PlaceActiveHandItemInInventory(IEntity user, Slots slot)
+        {
+            var inventory = Owner.GetComponent<InventoryComponent>();
+            var userHands = user.GetComponent<HandsComponent>();
+            var item = userHands.GetActiveHand;
+
+            bool Check()
+            {
+                if (!ActionBlockerSystem.CanInteract(user))
+                    return false;
+
+                if (item == null)
+                {
+                    _notifyManager.PopupMessageCursor(user, Loc.GetString("You aren't holding anything!"));
+                    return false;
+                }
+
+                if (!userHands.CanDrop(userHands.ActiveHand!))
+                {
+                    _notifyManager.PopupMessageCursor(user, Loc.GetString("You can't drop that!"));
+                    return false;
+                }
+
+                if (!inventory.HasSlot(slot))
+                    return false;
+
+                if (inventory.TryGetSlotItem(slot, out ItemComponent _))
+                {
+                    _notifyManager.PopupMessageCursor(user, Loc.GetString("{0:They} already {0:have} something there!", Owner));
+                    return false;
+                }
+
+                if (!inventory.CanEquip(slot, item))
+                {
+                    _notifyManager.PopupMessageCursor(user, Loc.GetString("{0:They} cannot equip that there!", Owner));
+                    return false;
+                }
+
+                return true;
+            }
+
+            var doAfterSystem = EntitySystem.Get<DoAfterSystem>();
+
+            var doAfterArgs = new DoAfterEventArgs(user, StripDelay, CancellationToken.None, Owner)
+            {
+                ExtraCheck = Check,
+                BreakOnStun = true,
+                BreakOnDamage = true,
+                BreakOnTargetMove = true,
+                BreakOnUserMove = true,
+                NeedHand = true,
+            };
+
+            var result = await doAfterSystem.DoAfter(doAfterArgs);
+            if (result != DoAfterStatus.Finished) return;
+
+            userHands.Drop(item!.Owner, false);
+            inventory.Equip(slot, item!.Owner);
+
+            UpdateSubscribed();
+        }
+
+        /// <summary>
+        ///     Places item in user's active hand in one of the entity's hands.
+        /// </summary>
+        private async void PlaceActiveHandItemInHands(IEntity user, string hand)
+        {
+            var hands = Owner.GetComponent<HandsComponent>();
+            var userHands = user.GetComponent<HandsComponent>();
+            var item = userHands.GetActiveHand;
+
+            bool Check()
+            {
+                if (!ActionBlockerSystem.CanInteract(user))
+                    return false;
+
+                if (item == null)
+                {
+                    _notifyManager.PopupMessageCursor(user, Loc.GetString("You aren't holding anything!"));
+                    return false;
+                }
+
+                if (!userHands.CanDrop(userHands.ActiveHand!))
+                {
+                    _notifyManager.PopupMessageCursor(user, Loc.GetString("You can't drop that!"));
+                    return false;
+                }
+
+                if (!hands.HasHand(hand))
+                    return false;
+
+                if (hands.TryGetItem(hand, out var _))
+                {
+                    _notifyManager.PopupMessageCursor(user, Loc.GetString("{0:They} already {0:have} something there!", Owner));
+                    return false;
+                }
+
+                if (!hands.CanPutInHand(item, hand))
+                {
+                    _notifyManager.PopupMessageCursor(user, Loc.GetString("{0:They} cannot put that there!", Owner));
+                    return false;
+                }
+
+                return true;
+            }
+
+            var doAfterSystem = EntitySystem.Get<DoAfterSystem>();
+
+            var doAfterArgs = new DoAfterEventArgs(user, StripDelay, CancellationToken.None, Owner)
+            {
+                ExtraCheck = Check,
+                BreakOnStun = true,
+                BreakOnDamage = true,
+                BreakOnTargetMove = true,
+                BreakOnUserMove = true,
+                NeedHand = true,
+            };
+
+            var result = await doAfterSystem.DoAfter(doAfterArgs);
+            if (result != DoAfterStatus.Finished) return;
+
+            userHands.Drop(hand, false);
+            hands.PutInHand(item, hand, false);
+            UpdateSubscribed();
+        }
+
+        /// <summary>
+        ///     Takes an item from the inventory and places it in the user's active hand.
+        /// </summary>
+        private async void TakeItemFromInventory(IEntity user, Slots slot)
+        {
+            var inventory = Owner.GetComponent<InventoryComponent>();
+            var userHands = user.GetComponent<HandsComponent>();
+
+            bool Check()
+            {
+                if (!ActionBlockerSystem.CanInteract(user))
+                    return false;
+
+                if (!inventory.HasSlot(slot))
+                    return false;
+
+                if (!inventory.TryGetSlotItem(slot, out ItemComponent itemToTake))
+                {
+                    _notifyManager.PopupMessageCursor(user, Loc.GetString("{0:They} {0:have} nothing there!", Owner));
+                    return false;
+                }
+
+                if (!inventory.CanUnequip(slot))
+                {
+                    _notifyManager.PopupMessageCursor(user, Loc.GetString("{0:They} cannot unequip that!", Owner));
+                    return false;
+                }
+
+                return true;
+            }
+
+            var doAfterSystem = EntitySystem.Get<DoAfterSystem>();
+
+            var doAfterArgs = new DoAfterEventArgs(user, StripDelay, CancellationToken.None, Owner)
+            {
+                ExtraCheck = Check,
+                BreakOnStun = true,
+                BreakOnDamage = true,
+                BreakOnTargetMove = true,
+                BreakOnUserMove = true,
+            };
+
+            var result = await doAfterSystem.DoAfter(doAfterArgs);
+            if (result != DoAfterStatus.Finished) return;
+
+            var item = inventory.GetSlotItem(slot);
+            inventory.Unequip(slot);
+            userHands.PutInHandOrDrop(item);
+            UpdateSubscribed();
+        }
+
+        /// <summary>
+        ///     Takes an item from a hand and places it in the user's active hand.
+        /// </summary>
+        private async void TakeItemFromHands(IEntity user, string hand)
+        {
+            var hands = Owner.GetComponent<HandsComponent>();
+            var userHands = user.GetComponent<HandsComponent>();
+
+            bool Check()
+            {
+                if (!ActionBlockerSystem.CanInteract(user))
+                    return false;
+
+                if (!hands.HasHand(hand))
+                    return false;
+
+                if (!hands.TryGetItem(hand, out var heldItem))
+                {
+                    _notifyManager.PopupMessageCursor(user, Loc.GetString("{0:They} {0:have} nothing there!", Owner));
+                    return false;
+                }
+
+                if (!hands.CanDrop(hand))
+                {
+                    _notifyManager.PopupMessageCursor(user, Loc.GetString("{0:They} cannot drop that!", Owner));
+                    return false;
+                }
+
+                return true;
+            }
+
+            var doAfterSystem = EntitySystem.Get<DoAfterSystem>();
+
+            var doAfterArgs = new DoAfterEventArgs(user, StripDelay, CancellationToken.None, Owner)
+            {
+                ExtraCheck = Check,
+                BreakOnStun = true,
+                BreakOnDamage = true,
+                BreakOnTargetMove = true,
+                BreakOnUserMove = true,
+            };
+
+            var result = await doAfterSystem.DoAfter(doAfterArgs);
+            if (result != DoAfterStatus.Finished) return;
+
+            var item = hands.GetItem(hand);
+            hands.Drop(hand, false);
+            userHands.PutInHandOrDrop(item);
+            UpdateSubscribed();
+        }
+
+        private void HandleUserInterfaceMessage(ServerBoundUserInterfaceMessage obj)
+        {
+            var user = obj.Session.AttachedEntity;
+            if (user == null || !(user.TryGetComponent(out HandsComponent userHands))) return;
+
+            var placingItem = userHands.GetActiveHand != null;
+
+            switch (obj.Message)
+            {
+                case StrippingInventoryButtonPressed inventoryMessage:
+                    var inventory = Owner.GetComponent<InventoryComponent>();
+
+                    if (inventory.TryGetSlotItem(inventoryMessage.Slot, out ItemComponent _))
+                        placingItem = false;
+
+                    if(placingItem)
+                        PlaceActiveHandItemInInventory(user, inventoryMessage.Slot);
+                    else
+                        TakeItemFromInventory(user, inventoryMessage.Slot);
+                    break;
+                case StrippingHandButtonPressed handMessage:
+                    var hands = Owner.GetComponent<HandsComponent>();
+
+                    if (hands.TryGetItem(handMessage.Hand, out _))
+                        placingItem = false;
+
+                    if(placingItem)
+                        PlaceActiveHandItemInHands(user, handMessage.Hand);
+                    else
+                        TakeItemFromHands(user, handMessage.Hand);
+                    break;
+                default:
+                    break;
+            }
+        }
+    }
+}

Content.Server/GameObjects/Components/Mobs/MindComponent.cs

@@ -132,12 +132,12 @@ namespace Content.Server.GameObjects.Components.Mobs
             if (!HasMind)
             {
                 message.AddMarkup(!dead
-                    ? $"[color=red]" + Loc.GetString("{0:They} are totally catatonic. The stresses of life in deep-space must have been too much for {0:them}. Any recovery is unlikely.", Owner) + "[/color]"
+                    ? $"[color=red]" + Loc.GetString("{0:They} {0:are} totally catatonic. The stresses of life in deep-space must have been too much for {0:them}. Any recovery is unlikely.", Owner) + "[/color]"
                     : $"[color=purple]" + Loc.GetString("{0:Their} soul has departed.", Owner) + "[/color]");
             }
             else if (Mind?.Session == null)
             {
-                message.AddMarkup("[color=yellow]" + Loc.GetString("{0:They} have a blank, absent-minded stare and appears completely unresponsive to anything. {0:They} may snap out of it soon.", Owner) + "[/color]");
+                message.AddMarkup("[color=yellow]" + Loc.GetString("{0:They} {0:have} a blank, absent-minded stare and appears completely unresponsive to anything. {0:They} may snap out of it soon.", Owner) + "[/color]");
             }
         }
     }

Content.Server/Interfaces/GameObjects/Components/Items/IHandsComponent.cs

@@ -1,6 +1,11 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using Content.Server.GameObjects;
+using Content.Server.GameObjects.Components.GUI;
 using Content.Server.GameObjects.Components.Items.Storage;
+using Content.Shared.GameObjects.Components.Inventory;
 using Content.Shared.GameObjects.Components.Items;
 using Content.Shared.GameObjects.EntitySystems;
 using Robust.Server.GameObjects.Components.Container;
@@ -12,10 +17,20 @@ namespace Content.Server.Interfaces.GameObjects.Components.Items
 {
     public interface IHandsComponent : ISharedHandsComponent
     {
+        /// <summary>
+        ///     Invoked when the hand contents changes or when a hand is added/removed.
+        /// </summary>
+        event Action? OnItemChanged;
+
+        /// <summary>
+        ///     The hands in this component.
+        /// </summary>
+        IEnumerable<string> Hands { get; }
+
         /// <summary>
         ///     The hand name of the currently active hand.
         /// </summary>
-        string ActiveHand { get; set; }
+        string? ActiveHand { get; set; }
 
         /// <summary>
         ///     Enumerates over every held item.
@@ -27,12 +42,20 @@ namespace Content.Server.Interfaces.GameObjects.Components.Items
         /// </summary>
         /// <param name="handName">The name of the hand to get.</param>
         /// <returns>The item in the held, null if no item is held</returns>
-        ItemComponent GetItem(string handName);
+        ItemComponent? GetItem(string handName);
+
+        /// <summary>
+        ///     Attempts to get an item in a hand.
+        /// </summary>
+        /// <param name="handName">The name of the hand to get.</param>
+        /// <param name="item">The item in the held, null if no item is held</param>
+        /// <returns>Whether it was holding an item</returns>
+        bool TryGetItem(string handName, [MaybeNullWhen(false)] out ItemComponent item);
 
         /// <summary>
         /// Gets item held by the current active hand
         /// </summary>
-        ItemComponent GetActiveHand { get; }
+        ItemComponent? GetActiveHand { get; }
 
         /// <summary>
         ///     Puts an item into any empty hand, preferring the active hand.
@@ -78,7 +101,7 @@ namespace Content.Server.Interfaces.GameObjects.Components.Items
         /// <returns>
         ///     true if the entity is held, false otherwise
         /// </returns>
-        bool TryHand(IEntity entity, out string handName);
+        bool TryHand(IEntity entity, [MaybeNullWhen(false)] out string handName);
 
         /// <summary>
         ///     Drops the item contained in the slot to the same position as our entity.

Content.Shared/GameObjects/Components/GUI/SharedStrippableComponent.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using Content.Shared.GameObjects.Components.Inventory;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameObjects.Components.UserInterface;
+using Robust.Shared.Serialization;
+using static Content.Shared.GameObjects.Components.Inventory.EquipmentSlotDefines;
+
+namespace Content.Shared.GameObjects.Components.GUI
+{
+    public class SharedStrippableComponent : Component
+    {
+        public override string Name => "Strippable";
+
+        [NetSerializable, Serializable]
+        public enum StrippingUiKey
+        {
+            Key,
+        }
+    }
+
+    [NetSerializable, Serializable]
+    public class StrippingInventoryButtonPressed : BoundUserInterfaceMessage
+    {
+        public Slots Slot { get; }
+
+        public StrippingInventoryButtonPressed(Slots slot)
+        {
+            Slot = slot;
+        }
+    }
+
+    [NetSerializable, Serializable]
+    public class StrippingHandButtonPressed : BoundUserInterfaceMessage
+    {
+        public string Hand { get; }
+
+        public StrippingHandButtonPressed(string hand)
+        {
+            Hand = hand;
+        }
+    }
+
+    [NetSerializable, Serializable]
+    public class StrippingBoundUserInterfaceState : BoundUserInterfaceState
+    {
+        public Dictionary<Slots, string> Inventory { get; }
+        public Dictionary<string, string> Hands { get; }
+
+        public StrippingBoundUserInterfaceState(Dictionary<Slots, string> inventory, Dictionary<string, string> hands)
+        {
+            Inventory = inventory;
+            Hands = hands;
+        }
+    }
+}

Resources/Prototypes/Entities/Mobs/Species/human.yml

@@ -144,6 +144,12 @@
   - type: Pullable
   - type: CanSeeGases
   - type: DoAfter
+  - type: Strippable
+  - type: UserInterface
+    interfaces:
+      - key: enum.StrippingUiKey.Key
+        type: StrippableBoundUserInterface
+
 
 - type: entity
   save: false

SpaceStation14.sln.DotSettings

@@ -71,10 +71,12 @@
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Soundfont/@EntryIndexedValue">True</s:Boolean>
     <s:Boolean x:Key="/Default/UserDictionary/Words/=soundfonts/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Spawner/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=Strippable/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=stunnable/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=superconduction/@EntryIndexedValue">True</s:Boolean>
     <s:Boolean x:Key="/Default/UserDictionary/Words/=swsl/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=underplating/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=unequip/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=unexcite/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=uplink/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Wirecutter/@EntryIndexedValue">True</s:Boolean>