using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using Thousandto.Core.Base;

namespace Thousandto.Plugins.Common
{
    public class AnyItemCache
    {
        // 已经使用列表
        private List<GameObject> _use = new List<GameObject>();
        // 废弃的列表
        private List<GameObject> _discard = new List<GameObject>();
        private int _size = 10;             // 默认容量
        private GameObject _Res = default(GameObject);      // 资源对象
        Transform _DelGrid = null;

        // 条目模板对象, 废弃条目根节点, 初始/扩展个数
        public AnyItemCache(GameObject res, Transform delGrid, int size = 10)
        {
            if (res != null && delGrid != null)
            {
                _size = size;
                _Res = res;
                _DelGrid = delGrid;
                CreateItem();
            }
        }

        // 创建条目对象
        private void CreateItem()
        {
            GameObject go = null;
            for (int i = 0; i < _size; ++i)
            {
                go = GameObject.Instantiate(_Res) as GameObject;
                go.name = "0";
                go.SetActive(false);
                go.transform.parent = _DelGrid;
                _discard.Add(go);
            }
            //Debug.LogWarning("创建缓冲区");
        }
        // 获得可用条目
        public GameObject Get()
        {
            if (_discard.Count <= 0)
            {
                CreateItem();           // 再创建指定数量并添加到废弃列表
            }
            GameObject result = null;
            result = _discard[0];
            _use.Add(_discard[0]);
            _discard.RemoveAt(0);
            return result;
        }
        // 回收指定条目
        public void Free(ulong id)
        {
            GameObject go = null;
            for (int i = 0, len = _use.Count; i < len; ++i)
            {
                go = _use[i];
                ulong _id = 0;
                if (ulong.TryParse(go.name, out _id) == true && _id == id)
                {
                    go.transform.parent = _DelGrid;
                    go.name = "0";
                    go.SetActive(false);
                    _discard.Add(go);
                    _use.RemoveAt(i);
                    break;
                }
            }
        }
        // 回收所有使用的条目
        public void AllFree()
        {
            GameObject go = null;
            for (int i = 0, len = _use.Count; i < len; ++i)
            {
                go = _use[i];
                go.transform.parent = _DelGrid;
                go.name = "0";
                go.SetActive(false);
                UIToggle ts = go.transform.GetComponent<UIToggle>();
                if (ts != null)
                {
                    ts.value = false;
                }
                UIButton btn = go.transform.GetComponent<UIButton>();
                if (btn != null)
                {
                    btn.onClick.Clear();
                }
                _discard.Add(go);
            }
            _use.Clear();
        }

        // 释放所有资源
        public void Destroy()
        {
            //for (int i = 0, len = _use.Count; i < len; ++i)
            //{
            //    GameObject.Destroy(_use[i]);
            //}
            //_use.Clear();
            //for (int i = 0, len = _discard.Count; i < len; ++i)
            //{
            //    GameObject.Destroy(_discard[i]);
            //}
            //_discard.Clear();
        }
    }
}