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using UnityEngine;

using System.Collections.Generic;

using UnityEngine.Events;

public class InventorySystem : MonoBehaviour

{

public static InventorySystem Instance { get; private set; }

[Header("Settings")]

[SerializeField] private int maxInventorySlots = 20;

// Events

public UnityEvent<InventoryItem> OnItemAdded;

public UnityEvent<InventoryItem> OnItemRemoved;

public UnityEvent<InventoryItem> OnItemUsed;

public UnityEvent OnInventoryChanged;

private List<InventoryItem> inventoryItems = new List<InventoryItem>();

private void Awake()

{

if (Instance == null)

{

Instance = this;

DontDestroyOnLoad(gameObject);

}

else

{

Destroy(gameObject);

}

// Initialize events if null

if (OnItemAdded == null) OnItemAdded = new UnityEvent<InventoryItem>();

if (OnItemRemoved == null) OnItemRemoved = new UnityEvent<InventoryItem>();

if (OnItemUsed == null) OnItemUsed = new UnityEvent<InventoryItem>();

if (OnInventoryChanged == null) OnInventoryChanged = new UnityEvent();

}

public bool AddItem(InventoryItem item)

{

if (inventoryItems.Count >= maxInventorySlots)

{

Debug.Log("Inventory is full!");

return false;

}

// Check if the item is stackable and already exists

if (item.isStackable)

{

InventoryItem existingItem = inventoryItems.Find(i => i.itemID == item.itemID);

if (existingItem != null)

{

existingItem.quantity += item.quantity;

OnInventoryChanged.Invoke();

OnItemAdded.Invoke(item);

return true;

}

}

// Add new item

inventoryItems.Add(item);

OnInventoryChanged.Invoke();

OnItemAdded.Invoke(item);

return true;

}

public bool RemoveItem(string itemID, int quantity = 1)

{

InventoryItem item = inventoryItems.Find(i => i.itemID == itemID);

if (item == null)

{

Debug.Log("Item not found in inventory!");

return false;

}

if (item.quantity < quantity)

{

Debug.Log("Not enough items to remove!");

return false;

}

item.quantity -= quantity;

if (item.quantity <= 0)

{

inventoryItems.Remove(item);

}

OnInventoryChanged.Invoke();

OnItemRemoved.Invoke(item);

return true;

}

public bool UseItem(string itemID)

{

InventoryItem item = inventoryItems.Find(i => i.itemID == itemID);

if (item == null)

{

Debug.Log("Item not found in inventory!");

return false;

}

// Handle consumable items

if (item.isConsumable)

{

item.quantity--;

if (item.quantity <= 0)

{

inventoryItems.Remove(item);

}

}

OnInventoryChanged.Invoke();

OnItemUsed.Invoke(item);

return true;

}

public List<InventoryItem> GetAllItems()

{

return new List<InventoryItem>(inventoryItems);

}

public InventoryItem GetItem(string itemID)

{

return inventoryItems.Find(i => i.itemID == itemID);

}

public int GetItemCount(string itemID)

{

InventoryItem item = inventoryItems.Find(i => i.itemID == itemID);

return item != null ? item.quantity : 0;

}

public bool HasItem(string itemID, int quantity = 1)

{

return GetItemCount(itemID) >= quantity;

}

public void ClearInventory()

{

inventoryItems.Clear();

OnInventoryChanged.Invoke();

}

}

[System.Serializable]

public class InventoryItem

{

public string itemID;

public string itemName;

public string description;

public Sprite icon;

public int quantity = 1;

public bool isStackable = true;

public bool isConsumable = false;

public ItemType itemType = ItemType.Misc;

public Dictionary<string, float> stats = new Dictionary<string, float>();

public InventoryItem(string id, string name, string desc, Sprite itemIcon, int qty = 1)

{

itemID = id;

itemName = name;

description = desc;

icon = itemIcon;

quantity = qty;

}

}

public enum ItemType

{

Weapon,

Armor,

Consumable,

Quest,

Misc

}