✨ Grid layer system

Scripts/System/GridManager.cs

@@ -1,31 +1,68 @@
 #nullable enable
+using System;
 using System.Collections.Generic;
 using Godot;
 
 namespace AceFieldNewHorizon.Scripts.System;
 
+public enum GridLayer
+{
+    Ground,    // Base layer (e.g., terrain, floors)
+    Building,  // Main building layer
+    Decoration // Additional layer for decorations, effects, etc.
+}
+
 public partial class GridManager : Node
 {
-    private Dictionary<Vector2I, Node2D> _grid = new();
+    private Dictionary<GridLayer, Dictionary<Vector2I, Node2D>> _layers = new();
 
-    public bool IsCellFree(Vector2I cell)
+    public GridManager()
     {
-        return !_grid.ContainsKey(cell);
+        // Initialize all layers
+        foreach (GridLayer layer in Enum.GetValues(typeof(GridLayer)))
+        {
+            _layers[layer] = new Dictionary<Vector2I, Node2D>();
+        }
     }
 
-    public void OccupyCell(Vector2I cell, Node2D building)
+    public bool IsCellFree(Vector2I cell, GridLayer layer = GridLayer.Building)
     {
-        _grid[cell] = building;
+        return !_layers[layer].ContainsKey(cell);
     }
 
-    public void FreeCell(Vector2I cell)
+    public void OccupyCell(Vector2I cell, Node2D building, GridLayer layer = GridLayer.Building)
     {
-        _grid.Remove(cell);
+        _layers[layer][cell] = building;
     }
 
-    public Node2D? GetBuildingAtCell(Vector2I cell)
+    public void FreeCell(Vector2I cell, GridLayer layer = GridLayer.Building)
     {
-        return _grid.GetValueOrDefault(cell);
+        if (_layers[layer].ContainsKey(cell))
+            _layers[layer].Remove(cell);
+    }
+
+    public Node2D? GetBuildingAtCell(Vector2I cell, GridLayer layer = GridLayer.Building)
+    {
+        return _layers[layer].GetValueOrDefault(cell);
+    }
+
+    public bool IsAnyCellOccupied(Vector2I cell, params GridLayer[] layers)
+    {
+        if (layers.Length == 0)
+        {
+            // Check all layers if none specified
+            foreach (var layer in _layers.Values)
+            {
+                if (layer.ContainsKey(cell)) return true;
+            }
+            return false;
+        }
+
+        foreach (var layer in layers)
+        {
+            if (_layers[layer].ContainsKey(cell)) return true;
+        }
+        return false;
     }
 }