using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System;

public class Inventory : MonoBehaviour {

    public static Inventory Instance;

    public int maxItems;

    public List<BaseItem> items;
    public List<Item> itemsToAddOnStart;
    public int ItemsCount
    {
        get
        {
            return items.Count;
        }
    }

    private void Start()
    {
        Instance = this;

        for (int i = 0; i < itemsToAddOnStart.Count; i++)
        {
            itemsToAddOnStart[i].AddOnStart();
        }
    }

    public void AddItem(BaseItem item)
    {
        if (IsContains(item))
        {
            AddToItem(item);
        }
        else if(items.Count < maxItems)
        {
            items.Add(item);
        }

        if(InventoryWindow.Instance != null)
            InventoryWindow.Instance.Init();
    }

    public bool IsContains(BaseItem item)
    {
        foreach (BaseItem i in items)
        {
            if (i.type == item.type && i.itemName == item.itemName)
            {
                return true;
            }
        }

        return false;
    }

    public void RemoveItem(BaseItem item)
    {
        int ind = items.IndexOf(item);
        if (items[ind].count > 1)
        {
            items[ind].count -= 1;
        }
        else
        {
            items.Remove(item);
        }

        if(InventoryWindow.Instance != null)
            InventoryWindow.Instance.Init();
    }

    public void RemoveItem(BaseItem item, int count)
    {
        int ind = items.IndexOf(item);
        if (items[ind].count > count)
        {
            items[ind].count -= count;
        }
        else if (items[ind].count == count)
        {
            items.Remove(item);
        }

        if(InventoryWindow.Instance != null)
            InventoryWindow.Instance.Init();
    }

    public BaseItem GetItemAtIndex(int index)
    {
        return items[index];
    }

    private void AddToItem(BaseItem item)
    {
        foreach (BaseItem i in items)
        {
            if (i.type == item.type && i.itemName == item.itemName)
            {
                i.count += item.count;
            }
        }

        if (InventoryWindow.Instance != null)
            InventoryWindow.Instance.Init();
    }

    public BaseItem GetItemWithName(string itemName)
    {
        BaseItem item = items.Find(i => i.itemName == itemName);
        return item;
    }

    public void UseItemWithName(string itemName, int count, Action<bool,int> onSuccess)
    {
        BaseItem item = GetItemWithName(itemName);
        if (item != null)
        {
            if (item.count >= count)
            {
                RemoveItem(item, count);
                onSuccess(true, count);
            }
            else
            {
                RemoveItem(item, item.count);
                onSuccess(true, item.count);
            }
        }
        onSuccess(false,0);
    }
}


public enum ItemType
{
    keys,
    weapons,
    medics,
    books,
    ammo,
    others
}