Hệ thống Kho đồ Đơn giản

/* --- ItemData (ScriptableObject) --- */
// (Giữ nguyên hoặc tương tự snippet scriptableobject-for-data)
// [CreateAssetMenu(fileName = "New Item", menuName = "Inventory/Item")]
// public class ItemData : ScriptableObject { ... }

/* --- InventorySlot.cs (Gắn vào từng ô UI) --- */
using UnityEngine;
using UnityEngine.UI;

public class InventorySlot : MonoBehaviour
{
    public Image icon;
    public Button removeButton;

    private ItemData item;

    public void AddItem(ItemData newItem)
    {
        item = newItem;
        icon.sprite = item.icon;
        icon.enabled = true;
        removeButton.interactable = true;
    }

    public void ClearSlot()
    {
        item = null;
        icon.sprite = null;
        icon.enabled = false;
        removeButton.interactable = false;
    }

    public void OnRemoveButton()
    {
        Inventory.instance.Remove(item);
    }
}

/* --- Inventory.cs (Singleton) --- */
using System.Collections.Generic;
using UnityEngine;

public class Inventory : MonoBehaviour
{
    public static Inventory instance;
    void Awake() { if(instance != null) { Destroy(gameObject); return; } instance = this; }

    public List<ItemData> items = new List<ItemData>();
    public int space = 20;

    public delegate void OnItemChanged();
    public OnItemChanged onItemChangedCallback;

    public bool Add(ItemData item)
    {
        if (items.Count >= space) {
            Debug.Log("Not enough room.");
            return false;
        }
        items.Add(item);
        onItemChangedCallback?.Invoke();
        return true;
    }

    public void Remove(ItemData item)
    {
        items.Remove(item);
        onItemChangedCallback?.Invoke();
    }
}

/* --- InventoryUI.cs (Quản lý toàn bộ UI) --- */
using UnityEngine;

public class InventoryUI : MonoBehaviour
{
    public Transform itemsParent;
    private Inventory inventory;
    private InventorySlot[] slots;

    void Start()
    {
        inventory = Inventory.instance;
        inventory.onItemChangedCallback += UpdateUI;
        slots = itemsParent.GetComponentsInChildren<InventorySlot>();
    }

    void UpdateUI()
    {
        for (int i = 0; i < slots.Length; i++)
        {
            if (i < inventory.items.Count)
            {
                slots[i].AddItem(inventory.items[i]);
            }
            else
            {
                slots[i].ClearSlot();
            }
        }
    }
}