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


public class Inventory : MonoBehaviour {

    private List<PickableItem> _items = new List<PickableItem>();

    public List<PickableItem> Items {
		get {
			return _items;
		}
	}

	public PickableItem QueryItem(string itemName, string className, ItemSocketType? socket) {
        var id = QueryItemIndex(itemName, className, socket);
	    if (id < 0) {
	        return null;
	    }
	    return _items[id];
	}

    public int QueryItemIndex(string itemName, string className, ItemSocketType? socket) {
        if (string.IsNullOrEmpty(name) && string.IsNullOrEmpty(className) && !socket.HasValue) {
            return -1;
        }

        for(int i = 0; i < _items.Count; ++i) {
            var item = _items[i];
            bool found = true;

            if (!string.IsNullOrEmpty(itemName) && item.description.Name != itemName) {
                found = false;
            }

            if (found && !string.IsNullOrEmpty(className) && item.description.TypeName != className) {
                found = false;
            }

            if (found && socket.HasValue && item.description.TargetSocket != socket.Value) {
                found = false;
            }

            if (found) {
                return i;
            }
        }
        return -1;
    }
	
	public void AddItem(PickableItem item){
	    if (item == null || _items.Contains(item)) {
	        return;
	    }
		_items.Add(item);
	    item.transform.parent = transform;
	    item.gameObject.SetActive(false);
	}

    public PickableItem QueryItem(int id) {
        if (id < 0 || id >= _items.Count) {
            return null;
        }
        return _items[id];
    }

    public bool UnequipItem(PickableItem item) {
        if (item != null && item.equipped && _items.Contains(item)) {
            var player = GetComponent<HumanController>();
            var socket = player.GetSocket(item.description.TargetSocket);
            if (socket != null) {
                socket.DetachItem(transform);
                return true;
            }
        }
        return false;
    }

    public bool EquipItem(PickableItem item) {
        if (item == null || !_items.Contains(item)) {
            return false;
        }
        return EquipItemInternal(item);
    }

    public bool EquipItem(int id) {
	    var item = QueryItem(id);
        return EquipItemInternal(item);
    }

    private bool EquipItemInternal(PickableItem item) {
        if (item == null || !item.description.IsEquippable || item.equipped) {
            return false;
        }

        var player = GetComponent<HumanController>();
        var socket = player.GetSocket(item.description.TargetSocket);
        if (socket != null) {
            socket.DetachItem(transform);
            socket.AttachItem(item);
            return true;
        }
        return false;
    }


    public void DeleteAllItems() {
        var deleteQueue = _items.ToArray();
        foreach (var pickableItem in deleteQueue) {
            UnequipItem(pickableItem);
            Destroy(pickableItem.gameObject);
        }
    }

	private AudioSource _audio;

	public AudioSource Audio{
		get{return _audio;}
	}
	// Use this for initialization
	void Start () {
		_audio = GetComponent<AudioSource>();
	}
	
	// Update is called once per frame
	void Update () {
	
	}

	void OnGUI(){
	
	}
}