✨ Item pickup

Scripts/System/ItemPickup.cs

@@ -0,0 +1,71 @@
+using Godot;
+
+namespace AceFieldNewHorizon.Scripts.System;
+
+public partial class ItemPickup : Node2D
+{
+    public const string PickupGroupName = "ItemPickupTarget";
+
+    [Export] public string ItemId { get; set; } = "";
+    [Export] public int Quantity { get; set; } = 1;
+    [Export] public bool Infinite { get; set; } = false;
+
+    private Sprite2D _sprite;
+
+    // Called when the node enters the scene tree
+    public override void _Ready()
+    {
+        var area = GetNode<Area2D>("Area2D");
+        area.BodyEntered += OnBodyEntered;
+
+        _sprite = GetNode<Sprite2D>("Sprite2D");
+        UpdateTexture();
+    }
+
+    private void UpdateTexture()
+    {
+        var file = FileAccess.Open("res://Data/ItemTextures.json", FileAccess.ModeFlags.Read);
+        if (file == null)
+        {
+            GD.PrintErr("Failed to open ItemTextures.json");
+            return;
+        }
+
+        var text = file.GetAsText();
+        file.Close();
+
+        var json = new Json();
+        var err = json.Parse(text);
+        if (err != Error.Ok)
+        {
+            GD.PrintErr(json.GetErrorMessage());
+            return;
+        }
+
+        var dict = json.Data.AsGodotDictionary();
+        if (!dict.TryGetValue(ItemId, out var value))
+            return;
+
+        var texturePath = value.AsString();
+        if (string.IsNullOrEmpty(texturePath))
+            return;
+
+        var texture = GD.Load<Texture2D>(texturePath);
+        if (texture == null)
+            return;
+
+        _sprite.Texture = texture;
+    }
+
+    private void OnBodyEntered(Node body)
+    {
+        if (body.IsInGroup(PickupGroupName))
+        {
+            if (body.HasMethod("AddItem"))
+                body.Call("AddItem", ItemId, Quantity);
+
+            if (!Infinite)
+                QueueFree(); // remove the pickup from the world
+        }
+    }
+}