✨ Merge stack

💫 Better miner tile vfx

Scripts/System/ItemPickup.cs

@@ -1,9 +1,14 @@
+using System.Collections;
+using AceFieldNewHorizon.Scripts.Entities;
 using Godot;
 
 namespace AceFieldNewHorizon.Scripts.System;
 
 public partial class ItemPickup : Area2D
 {
+    [Signal]
+    public delegate void StackMergedEventHandler(string itemId, int totalQuantity);
+
     public const string PickupGroupName = "ItemPickupTarget";
 
     [Export] public string ItemId { get; set; } = "";
@@ -11,6 +16,50 @@ public partial class ItemPickup : Area2D
     [Export] public bool Infinite { get; set; } = false;
     [Export] public float MagnetRange { get; set; } = 64f;
 
+    public int GetItemQuantity(string itemId)
+    {
+        if (itemId == ItemId)
+            return Quantity;
+        return 0;
+    }
+
+    public void SetItemQuantity(string itemId, int newQuantity)
+    {
+        if (itemId == ItemId)
+        {
+            Quantity = newQuantity;
+            // Update the quantity label if it exists
+            if (_quantityLabel != null)
+            {
+                if (Quantity > 1)
+                    _quantityLabel.Text = Quantity.ToString();
+                else
+                    _quantityLabel.Text = string.Empty;
+            }
+        }
+    }
+
+    public bool HasItem(string itemId)
+    {
+        return itemId == ItemId;
+    }
+
+    public void AddItem(string itemId, int amount)
+    {
+        if (itemId == ItemId)
+        {
+            Quantity += amount;
+            // Update the quantity label if it exists
+            if (_quantityLabel != null)
+            {
+                if (Quantity > 1)
+                    _quantityLabel.Text = Quantity.ToString();
+                else
+                    _quantityLabel.Text = string.Empty;
+            }
+        }
+    }
+
     private Sprite2D _sprite;
     private Label _quantityLabel;
     private Sprite2D _shadowSprite;
@@ -19,7 +68,8 @@ public partial class ItemPickup : Area2D
     // Called when the node enters the scene tree
     public override void _Ready()
     {
-        BodyEntered += OnBodyEntered;
+        BodyEntered += OnEntered;
+        AreaEntered += OnEntered;
 
         _sprite = GetNode<Sprite2D>("Sprite2D");
         UpdateTexture();
@@ -65,11 +115,9 @@ public partial class ItemPickup : Area2D
         if (_playerTarget != null)
         {
             var distance = Position.DistanceTo(_playerTarget.Position);
+            const float speed = 10f;
             if (distance <= MagnetRange)
-            {
-                float speed = 10f;
                 Position = Position.Lerp(_playerTarget.Position, (float)delta * speed);
-            }
         }
     }
 
@@ -108,37 +156,32 @@ public partial class ItemPickup : Area2D
         _sprite.Texture = texture;
     }
 
-    private void OnBodyEntered(Node body)
+    private void OnEntered(Node body)
     {
-        if (body.IsInGroup(PickupGroupName))
+        if (body is ItemPickup itemStack)
         {
-            if (body.HasMethod("AddItem"))
+            // Only process the merge for the item with the lower instance ID to prevent double merging
+            if (itemStack.ItemId != ItemId || GetInstanceId() > body.GetInstanceId()) 
+                return;
+            
+            // Get current quantity and add to it
+            var currentQuantity = itemStack.GetItemQuantity(ItemId);
+            var newQuantity = currentQuantity + Quantity;
+            itemStack.SetItemQuantity(ItemId, newQuantity);
+
+            // Emit signal for stack merge
+            EmitSignal(nameof(StackMerged), ItemId, newQuantity);
+            QueueFree();
+        }
+        else if (body.IsInGroup(PickupGroupName))
+        {
+            if (body is Player player)
             {
-                // First check if we can merge with existing items
-                if (body.HasMethod("HasItem"))
-                {
-                    var hasItem = (bool)body.Call("HasItem", ItemId);
-                    if (hasItem && body.HasMethod("GetItemQuantity"))
-                    {
-                        // Get current quantity and add to it
-                        var currentQuantity = (int)body.Call("GetItemQuantity", ItemId);
-                        body.Call("SetItemQuantity", ItemId, currentQuantity + Quantity);
-                    }
-                    else
-                    {
-                        // No existing item, add as new
-                        body.Call("AddItem", ItemId, Quantity);
-                    }
-                }
-                else
-                {
-                    // Fallback to original behavior if HasItem method doesn't exist
-                    body.Call("AddItem", ItemId, Quantity);
-                }
+                player.AddItem(ItemId, Quantity);
             }
 
             if (!Infinite)
-                QueueFree(); // remove the pickup from the world
+                QueueFree();
         }
     }
 }