Add door interaction system with state management and event publishing

GameCore/Interaction/DoorSystem.cs

@@ -0,0 +1,59 @@
+using GameCore.ECS;
+using GameCore.ECS.Interfaces;
+using GameCore.Events;
+
+namespace GameCore.Interaction;
+
+public class DoorSystem : ISystem
+{
+    public void Update(World world, float deltaTime)
+    {
+        var doors = world.GetEntitiesWith<DoorComponent>();
+        foreach (var entity in doors)
+        {
+            var door = world.GetComponent<DoorComponent>(entity);
+            if (door == null) continue;
+
+            switch (door.CurrentState)
+            {
+                case DoorComponent.DoorState.Opening:
+                    ApplyMovement(entity, door, world, deltaTime, DoorComponent.DoorState.Open,
+                        System.Math.Max(door.OpenSpeed, 0f));
+                    break;
+
+                case DoorComponent.DoorState.Closing:
+                    ApplyMovement(entity, door, world, -deltaTime, DoorComponent.DoorState.Closed, 0f);
+                    break;
+
+                case DoorComponent.DoorState.Open:
+                    door.Timer = System.Math.Max(door.OpenSpeed, 0f);
+                    door.OpenProgress = 1f;
+                    break;
+
+                case DoorComponent.DoorState.Closed:
+                case DoorComponent.DoorState.Locked:
+                    door.Timer = 0f;
+                    door.OpenProgress = 0f;
+                    break;
+            }
+        }
+    }
+
+    private void ApplyMovement(Entity entity, DoorComponent door, World world, float delta,
+        DoorComponent.DoorState targetState, float targetBoundary)
+    {
+        var effectiveSpeed = System.Math.Max(door.OpenSpeed, 0f);
+        door.Timer = System.Math.Clamp(door.Timer + delta, 0f, effectiveSpeed);
+
+        if (effectiveSpeed > 0f)
+            door.OpenProgress = System.Math.Clamp(door.Timer / effectiveSpeed, 0f, 1f);
+        else
+            door.OpenProgress = door.Timer > 0f ? 1f : 0f;
+
+        if ((!(delta > 0f) || !(door.Timer >= targetBoundary)) &&
+            (!(delta < 0f) || !(door.Timer <= targetBoundary))) return;
+        
+        door.CurrentState = targetState;
+        world.PublishEvent(new DoorStateChangedEvent(entity, door.CurrentState));
+    }
+}