fix: Issues With Behaviours Entering / Leaving the Hierarchy Callbacks Not Firing

Engine.Core/BehaviourController.cs

@@ -5,6 +5,7 @@ using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 
 using Syntriax.Engine.Core.Abstract;
+using Syntriax.Engine.Core.Exceptions;
 
 namespace Syntriax.Engine.Core;
 
@@ -17,17 +18,37 @@ public class BehaviourController : IBehaviourController
 
     public event IBehaviourController.OnBehaviourAddedDelegate? OnBehaviourAdded = null;
     public event IBehaviourController.OnBehaviourRemovedDelegate? OnBehaviourRemoved = null;
-    public event IAssignable.OnUnassignedDelegate? OnUnassigned;
     public event IAssignableGameObject.OnGameObjectAssignedDelegate? OnGameObjectAssigned = null;
 
+    public event IInitialize.OnInitializedDelegate? OnInitialized = null;
+    public event IInitialize.OnFinalizedDelegate? OnFinalized = null;
+
+    public event IAssignable.OnUnassignedDelegate? OnUnassigned = null;
 
     private readonly IList<IBehaviour> behaviours = new List<IBehaviour>(Constants.BEHAVIOURS_SIZE_INITIAL);
 
     private IGameObject _gameObject = null!;
-
+    private bool _initialized = false;
 
     public IGameObject GameObject => _gameObject;
 
+
+    public bool IsInitialized
+    {
+        get => _initialized;
+        private set
+        {
+            if (value == _initialized)
+                return;
+
+            _initialized = value;
+            if (value)
+                OnInitialized?.Invoke(this);
+            else
+                OnFinalized?.Invoke(this);
+        }
+    }
+
     public T AddBehaviour<T>(T behaviour) where T : class, IBehaviour
     {
         InsertBehaviourByPriority(behaviour);
@@ -121,9 +142,36 @@ public class BehaviourController : IBehaviourController
         return true;
     }
 
+
+    public bool Initialize()
+    {
+        if (IsInitialized)
+            return false;
+
+        NotAssignedException.Check(this, _gameObject);
+
+        foreach (IBehaviour behaviour in behaviours)
+            behaviour.Initialize();
+
+        IsInitialized = true;
+        return true;
+    }
+
+    public bool Finalize()
+    {
+        if (!IsInitialized)
+            return false;
+
+        foreach (IBehaviour behaviour in behaviours)
+            behaviour.Finalize();
+
+        IsInitialized = false;
+        return true;
+    }
+
     public bool Unassign()
     {
-        if (GameObject is not null && GameObject.IsInitialized)
+        if (IsInitialized)
             return false;
 
         _gameObject = null!;