using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using XLua;

/// <summary>
/// Lua管理器
/// 提供 lua解析器
/// 保证解析器的唯一性
/// </summary>
public class LuaMgr : BaseManager<LuaMgr>
{
    //执行Lua语言的函数
    //释放垃圾
    //销毁
    //重定向
    private LuaEnv luaEnv;


    /// <summary>
    /// 得到Lua中的_G
    /// </summary>
    public LuaTable Global
    {
        get
        {
            return luaEnv.Global;
        }
    }


    /// <summary>
    /// 初始化解析器
    /// </summary>
    public void Init()
    {
        //已经初始化了 别初始化 直接返回
        if (luaEnv != null)
            return;
        //初始化
        luaEnv = new LuaEnv();
        //加载lua脚本 重定向
        luaEnv.AddLoader(MyCustomLoader);
        luaEnv.AddLoader(MyCustomABLoader);
    }

    //自动执行
    private byte[] MyCustomLoader(ref string filePath)
    {
        //通过函数中的逻辑 去加载 Lua文件 
        //传入的参数 是 require执行的lua脚本文件名
        //拼接一个Lua文件所在路径
        string path = Application.dataPath + "/Lua/" + filePath + ".lua";

        //有路径 就去加载文件 
        //File知识点 C#提供的文件读写的类
        //判断文件是否存在
        if (File.Exists(path))
        {
            return File.ReadAllBytes(path);
        }
        else
        {
            Debug.Log("MyCustomLoader重定向失败，文件名为" + filePath);
        }


        return null;
    }


    //Lua脚本会放在AB包 
    //最终我们会通过加载AB包再加载其中的Lua脚本资源 来执行它
    //重定向加载AB包中的LUa脚本
    private byte[] MyCustomABLoader(ref string filePath)
    {
        //Debug.Log("进入AB包加载 重定向函数");
        ////从AB包中加载lua文件
        ////加载AB包
        //string path = Application.streamingAssetsPath + "/lua";
        //AssetBundle ab = AssetBundle.LoadFromFile(path);

        ////加载Lua文件 返回
        //TextAsset tx = ab.LoadAsset<TextAsset>(filePath + ".lua");
        ////加载Lua文件 byte数组
        //return tx.bytes;

        //通过我们的AB包管理器 加载的lua脚本资源
        TextAsset lua = ABMgr.GetInstance().LoadRes<TextAsset>("lua", filePath + ".lua");
        if (lua != null)
            return lua.bytes;
        else
            Debug.Log("MyCustomABLoader重定向失败，文件名为：" + filePath);

        return null;
    }


    /// <summary>
    /// 传入lua文件名 执行lua脚本
    /// </summary>
    /// <param name="fileName"></param>
    public void DoLuaFile(string fileName)
    {
        string str = string.Format("require('{0}')", fileName);
        DoString(str);
    }

    /// <summary>
    /// 执行Lua语言
    /// </summary>
    /// <param name="str"></param>
    public void DoString(string str)
    {
        if(luaEnv == null)
        {
            Debug.Log("解析器为初始化");
            return;
        }
        luaEnv.DoString(str);
    }

    /// <summary>
    /// 释放lua 垃圾
    /// </summary>
    public void Tick()
    {
        if (luaEnv == null)
        {
            Debug.Log("解析器为初始化");
            return;
        }
        luaEnv.Tick();
    }

    /// <summary>
    /// 销毁解析器
    /// </summary>
    public void Dispose()
    {
        if (luaEnv == null)
        {
            Debug.Log("解析器为初始化");
            return;
        }
        luaEnv.Dispose();
        luaEnv = null;
    }
}

以下是abMgr

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

//知识点
//字典
//协程
//AB包相关API
//委托
//lambda表达式
//单例模式基类——>观看Unity小框架视频 进行学习
public class ABMgr : SingletonAutoMono<ABMgr>
{
    //主包
    private AssetBundle mainAB = null;
    //主包依赖获取配置文件
    private AssetBundleManifest manifest = null;

    //选择存储 AB包的容器
    //AB包不能够重复加载 否则会报错
    //字典知识 用来存储 AB包对象
    private Dictionary<string, AssetBundle> abDic = new Dictionary<string, AssetBundle>();

    /// <summary>
    /// 获取AB包加载路径
    /// </summary>
    private string PathUrl
    {
        get
        {
            return Application.streamingAssetsPath + "/";
        }
    }

    /// <summary>
    /// 主包名 根据平台不同 报名不同
    /// </summary>
    private string MainName
    {
        get
        {
#if UNITY_IOS
            return "IOS";
#elif UNITY_ANDROID
            return "Android";
#else
            return "PC";
#endif
        }
    }

    /// <summary>
    /// 加载主包 和 配置文件
    /// 因为加载所有包是 都得判断 通过它才能得到依赖信息
    /// 所以写一个方法
    /// </summary>
    private void LoadMainAB()
    {
        if( mainAB == null )
        {
            mainAB = AssetBundle.LoadFromFile( PathUrl + MainName);
            manifest = mainAB.LoadAsset<AssetBundleManifest>("AssetBundleManifest");
        }
    }

    /// <summary>
    /// 加载指定包的依赖包
    /// </summary>
    /// <param name="abName"></param>
    private void LoadDependencies(string abName)
    {
        //加载主包
        LoadMainAB();
        //获取依赖包
        string[] strs = manifest.GetAllDependencies(abName);
        for (int i = 0; i < strs.Length; i++)
        {
            if (!abDic.ContainsKey(strs[i]))
            {
                AssetBundle ab = AssetBundle.LoadFromFile(PathUrl + strs[i]);
                abDic.Add(strs[i], ab);
            }
        }
    }

    /// <summary>
    /// 泛型资源同步加载
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="abName"></param>
    /// <param name="resName"></param>
    /// <returns></returns>
    public T LoadRes<T>(string abName, string resName) where T:Object
    {
        //加载依赖包
        LoadDependencies(abName);
        //加载目标包
        if ( !abDic.ContainsKey(abName) )
        {
            AssetBundle ab = AssetBundle.LoadFromFile(PathUrl + abName);
            abDic.Add(abName, ab);
        }

        //得到加载出来的资源
        T obj = abDic[abName].LoadAsset<T>(resName);
        //如果是GameObject 因为GameObject 100%都是需要实例化的
        //所以我们直接实例化
        if (obj is GameObject)
            return Instantiate(obj);
        else
            return obj;
    }

    /// <summary>
    /// Type同步加载指定资源
    /// </summary>
    /// <param name="abName"></param>
    /// <param name="resName"></param>
    /// <param name="type"></param>
    /// <returns></returns>
    public Object LoadRes(string abName, string resName, System.Type type) 
    {
        //加载依赖包
        LoadDependencies(abName);
        //加载目标包
        if (!abDic.ContainsKey(abName))
        {
            AssetBundle ab = AssetBundle.LoadFromFile(PathUrl + abName);
            abDic.Add(abName, ab);
        }

        //得到加载出来的资源
        Object obj = abDic[abName].LoadAsset(resName, type);
        //如果是GameObject 因为GameObject 100%都是需要实例化的
        //所以我们直接实例化
        if (obj is GameObject)
            return Instantiate(obj);
        else
            return obj;
    }

    /// <summary>
    /// 名字 同步加载指定资源
    /// </summary>
    /// <param name="abName"></param>
    /// <param name="resName"></param>
    /// <returns></returns>
    public Object LoadRes(string abName, string resName)
    {
        //加载依赖包
        LoadDependencies(abName);
        //加载目标包
        if (!abDic.ContainsKey(abName))
        {
            AssetBundle ab = AssetBundle.LoadFromFile(PathUrl + abName);
            abDic.Add(abName, ab);
        }

        //得到加载出来的资源
        Object obj = abDic[abName].LoadAsset(resName);
        //如果是GameObject 因为GameObject 100%都是需要实例化的
        //所以我们直接实例化
        if (obj is GameObject)
            return Instantiate(obj);
        else
            return obj;
    }

    /// <summary>
    /// 泛型异步加载资源
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="abName"></param>
    /// <param name="resName"></param>
    /// <param name="callBack"></param>
    public void LoadResAsync<T>(string abName, string resName, UnityAction<T> callBack) where T:Object
    {
        StartCoroutine(ReallyLoadResAsync<T>(abName, resName, callBack));
    }
    //正儿八经的 协程函数
    private IEnumerator ReallyLoadResAsync<T>(string abName, string resName, UnityAction<T> callBack) where T : Object
    {
        //加载依赖包
        LoadDependencies(abName);
        //加载目标包
        if (!abDic.ContainsKey(abName))
        {
            AssetBundle ab = AssetBundle.LoadFromFile(PathUrl + abName);
            abDic.Add(abName, ab);
        }
        //异步加载包中资源
        AssetBundleRequest abq = abDic[abName].LoadAssetAsync<T>(resName);
        yield return abq;

        if (abq.asset is GameObject)
            callBack(Instantiate(abq.asset) as T);
        else
            callBack(abq.asset as T);
    }

    /// <summary>
    /// Type异步加载资源
    /// </summary>
    /// <param name="abName"></param>
    /// <param name="resName"></param>
    /// <param name="type"></param>
    /// <param name="callBack"></param>
    public void LoadResAsync(string abName, string resName, System.Type type, UnityAction<Object> callBack)
    {
        StartCoroutine(ReallyLoadResAsync(abName, resName, type, callBack));
    }

    private IEnumerator ReallyLoadResAsync(string abName, string resName, System.Type type, UnityAction<Object> callBack)
    {
        //加载依赖包
        LoadDependencies(abName);
        //加载目标包
        if (!abDic.ContainsKey(abName))
        {
            AssetBundle ab = AssetBundle.LoadFromFile(PathUrl + abName);
            abDic.Add(abName, ab);
        }
        //异步加载包中资源
        AssetBundleRequest abq = abDic[abName].LoadAssetAsync(resName, type);
        yield return abq;

        if (abq.asset is GameObject)
            callBack(Instantiate(abq.asset));
        else
            callBack(abq.asset);
    }

    /// <summary>
    /// 名字 异步加载 指定资源
    /// </summary>
    /// <param name="abName"></param>
    /// <param name="resName"></param>
    /// <param name="callBack"></param>
    public void LoadResAsync(string abName, string resName, UnityAction<Object> callBack)
    {
        StartCoroutine(ReallyLoadResAsync(abName, resName, callBack));
    }

    private IEnumerator ReallyLoadResAsync(string abName, string resName, UnityAction<Object> callBack)
    {
        //加载依赖包
        LoadDependencies(abName);
        //加载目标包
        if (!abDic.ContainsKey(abName))
        {
            AssetBundle ab = AssetBundle.LoadFromFile(PathUrl + abName);
            abDic.Add(abName, ab);
        }
        //异步加载包中资源
        AssetBundleRequest abq = abDic[abName].LoadAssetAsync(resName);
        yield return abq;

        if (abq.asset is GameObject)
            callBack(Instantiate(abq.asset));
        else
            callBack(abq.asset);
    }

    //卸载AB包的方法
    public void UnLoadAB(string name)
    {
        if( abDic.ContainsKey(name) )
        {
            abDic[name].Unload(false);
            abDic.Remove(name);
        }
    }

    //清空AB包的方法
    public void ClearAB()
    {
        AssetBundle.UnloadAllAssetBundles(false);
        abDic.Clear();
        //卸载主包
        mainAB = null;
    }
}