✨ Building task queue and remove duplicated construction complete sound

Scripts/System/PlacementManager.cs

@@ -10,8 +10,68 @@ public partial class PlacementManager : Node2D
 {
     [Export] public GridManager Grid { get; set; }
     [Export] public BuildingRegistry Registry { get; set; }
+    [Export] public int MaxConcurrentBuilds { get; set; } = 6; // Make it adjustable in editor
 
     private static readonly List<string> BuildableTiles = ["wall", "miner"];
+    private readonly List<BuildTask> _activeBuilds = new();
+    private AudioStreamPlayer _completionSound;
+
+    public override void _Ready()
+    {
+        base._Ready();
+        
+        // Setup completion sound
+        _completionSound = new AudioStreamPlayer();
+        AddChild(_completionSound);
+        var sound = GD.Load<AudioStream>("res://Sounds/Events/ConstructionComplete.wav");
+        if (sound != null)
+        {
+            _completionSound.Stream = sound;
+        }
+    }
+
+    private void OnBuildCompleted()
+    {
+        // Remove all completed builds
+        _activeBuilds.RemoveAll(task => task.IsCompleted);
+        
+        // If no builds left, play the completion sound
+        if (_activeBuilds.Count == 0)
+        {
+            _completionSound.Play();
+        }
+    }
+
+    // Call this when starting a new build
+    private bool CanStartNewBuild()
+    {
+        // Remove completed builds
+        _activeBuilds.RemoveAll(task => task.IsCompleted);
+        return _activeBuilds.Count < MaxConcurrentBuilds;
+    }
+
+    private class BuildTask : IDisposable
+    {
+        private readonly Action _onCompleted;
+        public bool IsCompleted { get; private set; }
+
+        public BuildTask(Action onCompleted)
+        {
+            _onCompleted = onCompleted;
+        }
+
+        public void Complete()
+        {
+            if (IsCompleted) return;
+            IsCompleted = true;
+            _onCompleted?.Invoke();
+        }
+
+        public void Dispose()
+        {
+            Complete();
+        }
+    }
 
     private string _currentBuildingId = "wall";
     private Vector2I _hoveredCell;
@@ -121,6 +181,12 @@ public partial class PlacementManager : Node2D
         {
             var building = Registry.GetBuilding(_currentBuildingId);
             if (building == null) return;
+            
+            if (!CanStartNewBuild())
+            {
+                // Optionally show feedback to player that build queue is full
+                return;
+            }
 
             var scene = building.Scene;
             var buildingInstance = (BaseTile)scene.Instantiate();
@@ -132,7 +198,11 @@ public partial class PlacementManager : Node2D
             Grid.OccupyArea(_hoveredCell, buildingInstance, building.Size, _currentRotation, building.Layer);
 
             if (building.BuildTime > 0f)
-                buildingInstance.StartConstruction(building.BuildTime);
+            {
+                var buildTask = new BuildTask(OnBuildCompleted);
+                _activeBuilds.Add(buildTask);
+                buildingInstance.StartConstruction(building.BuildTime, buildTask.Complete);
+            }
         }
 
         if (Input.IsActionPressed("destroy_tile") &&