From b8217f2106dd056c0a1d9eb591e2513e466b2389 Mon Sep 17 00:00:00 2001
From: Syntriax <syntriax@gmail.com>
Date: Sun, 3 Aug 2025 09:43:18 +0300
Subject: [PATCH] feat: last active frame interface

---
 Engine.Core/Systems/Abstract/ILastFrameUpdate.cs | 6 ++++++
 Engine.Core/Systems/UpdateManager.cs             | 9 +++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 Engine.Core/Systems/Abstract/ILastFrameUpdate.cs

diff --git a/Engine.Core/Systems/Abstract/ILastFrameUpdate.cs b/Engine.Core/Systems/Abstract/ILastFrameUpdate.cs
new file mode 100644
index 0000000..9957da1
--- /dev/null
+++ b/Engine.Core/Systems/Abstract/ILastFrameUpdate.cs
@@ -0,0 +1,6 @@
+namespace Syntriax.Engine.Core;
+
+public interface ILastFrameUpdate : IBehaviour
+{
+    void LastActiveFrame();
+}
diff --git a/Engine.Core/Systems/UpdateManager.cs b/Engine.Core/Systems/UpdateManager.cs
index 20e5f58..0777f47 100644
--- a/Engine.Core/Systems/UpdateManager.cs
+++ b/Engine.Core/Systems/UpdateManager.cs
@@ -8,6 +8,7 @@ public class UpdateManager : Behaviour
     private static Comparer<IBehaviour> SortByAscendingPriority() => Comparer<IBehaviour>.Create((x, y) => x.Priority.CompareTo(y.Priority));
 
     private readonly ActiveBehaviourCollectorSorted<IFirstFrameUpdate> firstFrameUpdates = new() { SortBy = SortByAscendingPriority() };
+    private readonly ActiveBehaviourCollector<ILastFrameUpdate> lastFrameUpdates = new();
     private readonly ActiveBehaviourCollectorSorted<IPreUpdate> preUpdateEntities = new() { SortBy = SortByAscendingPriority() };
     private readonly ActiveBehaviourCollectorSorted<IUpdate> updateEntities = new() { SortBy = SortByAscendingPriority() };
     private readonly ActiveBehaviourCollectorSorted<IPostUpdate> postUpdateEntities = new() { SortBy = SortByAscendingPriority() };
@@ -17,6 +18,7 @@ public class UpdateManager : Behaviour
     protected override void OnEnteredUniverse(IUniverse universe)
     {
         firstFrameUpdates.Assign(universe);
+        lastFrameUpdates.Assign(universe);
         preUpdateEntities.Assign(universe);
         updateEntities.Assign(universe);
         postUpdateEntities.Assign(universe);
@@ -29,6 +31,7 @@ public class UpdateManager : Behaviour
     protected override void OnExitedUniverse(IUniverse universe)
     {
         firstFrameUpdates.Unassign();
+        lastFrameUpdates.Unassign();
         preUpdateEntities.Unassign();
         updateEntities.Unassign();
         postUpdateEntities.Unassign();
@@ -67,8 +70,14 @@ public class UpdateManager : Behaviour
         toCallFirstFrameUpdates.Add(args.BehaviourCollected);
     }
 
+    private void OnLastFrameRemoved(IBehaviourCollector<ILastFrameUpdate> sender, IBehaviourCollector<ILastFrameUpdate>.BehaviourRemovedArguments args)
+    {
+        args.BehaviourRemoved.LastActiveFrame();
+    }
+
     public UpdateManager()
     {
         firstFrameUpdates.OnCollected.AddListener(OnFirstFrameCollected);
+        lastFrameUpdates.OnRemoved.AddListener(OnLastFrameRemoved);
     }
 }