Chameleon clothing (#8444)

Co-authored-by: Moony <moonheart08@users.noreply.github.com>
Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Shared/Clothing/EntitySystems/SharedChameleonClothingSystem.cs

@@ -0,0 +1,72 @@
+using Content.Shared.Clothing.Components;
+using Content.Shared.Inventory;
+using Content.Shared.Item;
+using Content.Shared.Tag;
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.Clothing.EntitySystems;
+
+public abstract class SharedChameleonClothingSystem : EntitySystem
+{
+    [Dependency] private readonly IComponentFactory _factory = default!;
+    [Dependency] private readonly IPrototypeManager _proto = default!;
+    [Dependency] private readonly SharedItemSystem _itemSystem = default!;
+    [Dependency] private readonly ClothingSystem _clothingSystem = default!;
+
+    // Updates chameleon visuals and meta information.
+    // This function is called on a server after user selected new outfit.
+    // And after that on a client after state was updated.
+    // This 100% makes sure that server and client have exactly same data.
+    protected void UpdateVisuals(EntityUid uid, ChameleonClothingComponent component)
+    {
+        if (string.IsNullOrEmpty(component.SelectedId) ||
+            !_proto.TryIndex(component.SelectedId, out EntityPrototype? proto))
+            return;
+
+        // world sprite icon
+        UpdateSprite(uid, proto);
+
+        // copy name and description
+        var meta = MetaData(uid);
+        meta.EntityName = proto.Name;
+        meta.EntityDescription = proto.Description;
+
+        // item sprite logic
+        if (TryComp(uid, out ItemComponent? item) &&
+            proto.TryGetComponent(out ItemComponent? otherItem, _factory))
+        {
+            _itemSystem.CopyVisuals(uid, otherItem, item);
+        }
+
+        // clothing sprite logic
+        if (TryComp(uid, out SharedClothingComponent? clothing) &&
+            proto.TryGetComponent("Clothing", out SharedClothingComponent? otherClothing))
+        {
+            _clothingSystem.CopyVisuals(uid, otherClothing, clothing);
+        }
+    }
+
+    protected virtual void UpdateSprite(EntityUid uid, EntityPrototype proto) { }
+
+    /// <summary>
+    ///     Check if this entity prototype is valid target for chameleon item.
+    /// </summary>
+    public bool IsValidTarget(EntityPrototype proto, SlotFlags chameleonSlot = SlotFlags.NONE)
+    {
+        // check if entity is valid
+        if (proto.Abstract || proto.NoSpawn)
+            return false;
+
+        // check if it is marked as valid chameleon target
+        if (!proto.TryGetComponent(out TagComponent? tags, _factory) || !tags.Tags.Contains("WhitelistChameleon"))
+            return false;
+
+        // check if it's valid clothing
+        if (!proto.TryGetComponent("Clothing", out SharedClothingComponent? clothing))
+            return false;
+        if (!clothing.Slots.HasFlag(chameleonSlot))
+            return false;
+
+        return true;
+    }
+}