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

/// <summary>
/// 池子里的一列容器
/// </summary>
public class poolData
{
    //容器对象挂载的父节点
    public GameObject fatherObj;
    //对象的容器
    public List<GameObject> poolList;

    //构造函数
    public poolData(GameObject obj,GameObject poolObj)
    {
        //给我们的容器创建一个父对象，并且把他作为我们pool对象的子物体
        fatherObj = new GameObject(obj.name);
        fatherObj.transform.parent = poolObj.transform;

        poolList = new List<GameObject>() { obj };
        PushObj(obj); 
    }

    /// <summary>
    /// 往容器里面压东西
    /// </summary>
    /// <param name="obj"></param>
    public void PushObj(GameObject obj)
    {
        //失活隐藏
        obj.SetActive(false);
        //存起来
        poolList.Add(obj);
        //设置父对象
        obj.transform.parent = fatherObj.transform;
    }

    /// <summary>
    /// 从容器里面取东西
    /// </summary>
    /// <returns></returns>
    public GameObject GetObj()
    {
        GameObject obj = null;
        //取出第一个
        obj = poolList[0];
        poolList.RemoveAt(0);
        //激活显示
        obj.SetActive(true);
        //断开父对象
        obj.transform.parent = null;
        return obj;
    }
}

//缓存池模块，对象池
//Dictionary List  字典 链表
//GameObject和Resources两个公共类的API
public class PoolMgr :BaseManager<PoolMgr>
{
    //缓存池容器
    public Dictionary<string,poolData> poolDic = new Dictionary<string, poolData>();

    private GameObject poolObj;

    /// <summary>
    /// 往外拿东西
    /// </summary>
    /// <param name="name"></param>
    /// <returns></returns>
    public void GetObj(string name,UnityAction<GameObject> callback)
    {
        //GameObject obj = null;
        //有容器，且容器有物品，可以拿
        if(poolDic.ContainsKey(name) && poolDic[name].poolList.Count > 0)
        {
            //obj = poolDic[name].GetObj();
            callback(poolDic[name].GetObj());
        }
        
        else
        {
            //将下面的改成异步加载资源，创建对象给外部用
            ResMgr.GetInstance().LoadAsync<GameObject>(name, (o) =>
            {
                o.name = name;
                callback(o);
            });

           // obj = GameObject.Instantiate(Resources.Load<GameObject>(name));
            //把对面名字改得和池子的名字一样
           // obj.name = name;
        }

      
    }

    /// <summary>
    /// 还回去
    /// </summary>
    public void PushObj(string name, GameObject obj)
    {
        if (poolObj == null)
        {
            poolObj = new GameObject("Pool");
        }
   
        //里面有容器
        if (poolDic.ContainsKey(name))
        {
            poolDic[name].PushObj(obj);
        }
        //里面没有容器
        else
        {
            //加一个list直接加个物品进去
            poolDic.Add(name, new poolData(obj,poolObj));
        }
    }

    /// <summary>
    /// 清空缓存池，主要用在场景切换时
    /// </summary>
    public void Clear()
    {
        poolDic.Clear();
        poolObj = null;
    }
}