using System.Collections;
using System.Collections.Generic;
using System.IO;
using Thousandto.Cfg.Data;
using Thousandto.Code.Center;
using Thousandto.Core.Asset;
using Thousandto.Core.Base;
using Thousandto.Update.Flow;
using Thousandto.Update.Manager;
using UnityEngine;
using PathUtils = UnityEngine.Gonbest.MagicCube.PathUtils;
using CoroutinePool = UnityEngine.Gonbest.MagicCube.CoroutinePool;
using StringUtils = UnityEngine.Gonbest.MagicCube.StringUtils;

namespace Thousandto.Code.Logic
{
    /// <summary>
    /// 后台加载场景
    /// </summary>
    public class SceneBackLoadSystem
    {
        #region//私有变量
        private int _timeOut = 1800;
        private int _tickTime = 0;
        private bool _isRun = false;
        private SceneBackLoadData _curData = null;
        private List<SceneBackLoadData> _dataList = null;
        #endregion

        #region//const
        private const string CONST_PATH = "GameAssets/Resources/Scene";
        #endregion

        #region//公共函数
        public void Initialize()
        {
            _dataList = new List<SceneBackLoadData>(DeclareSceneLoadConfig.CacheDataCount);
            var enumer = DeclareSceneLoadConfig.CacheData.GetEnumerator();
            try
            {
                while (enumer.MoveNext())
                {
                    var data = new SceneBackLoadData(enumer.Current.Value);
                    _dataList.Add(data);
                }
            }
            finally
            {
                enumer.Dispose();
            }
        }

        public void Uninitialize()
        {
            _isRun = false;
            _dataList.Clear();
        }

        //后台加载场景
        public void BackDown()
        {
            if (_isRun)
                return;
            int total = GameCenter.UpdateSystem.GetBaseResTotalSize();
            int downloaded = GameCenter.UpdateSystem.GetTotalDownloadedSize();
            if (total <= 0 && downloaded >= total)
            {
                //没有资源需要下载了
                return;
            }
            CoroutinePool.AddTask(DownLoad());
            _isRun = true;
        }

        #endregion

        #region//私有函数
        private void Download(string requestPath)
        {
            _tickTime = _timeOut;
            //这里把请求路径中统一分隔符
            var fc = new FileClasses(requestPath.Replace('\\', '/'), AssetTypeCode.Scene, null, AsyncActionType.LoadScene, false, null,FileRequestTypeCode.WWW);
            if (PathUtils.IsStreaming() && fc.FileRequestCode != FileRequestTypeCode.Resource)
            {
                //FLogger.LogTime(string.Format("++++++++++++开始下载场景的资源的请求路径是：{0} ", requestPath));
                //下载场景文件
                UpdateManager.Instance.DownloadResource(fc.AssetsPath, OnDownloadCallback, fc);
            }
            else
            {
                _isRun = false;
            }
        }


        IEnumerator DownLoad()
        {
            while (GetDataCount()>0)
            {
                _curData = GetData();
                if (!_curData.IsLoading && !UpdateManager.Instance.IsPaused())
                {
                    //string assetPath = string.Format("{0}/{1}", CONST_PATH, data.Cfg.ResName);
                    string requstPath = StringUtils.CombineString(AssetConstDefine.PathScene, _curData.Cfg.ResName, AssetConstDefine.ExtUnity);
                    _curData.IsLoading = true;
                    Download(requstPath);
                    while (_curData.Result == SceneDownLoadResult.Defalut || !_curData.IsCacheOver)
                    {
                        yield return new WaitForEndOfFrame();
                    }
                    _curData.IsLoading = false;
                    if (_curData.Result == SceneDownLoadResult.Success)
                    {
                        DownLoadSucess(_curData);
                    }
                    else if (_curData.Result == SceneDownLoadResult.Fail)
                    {
                        //FLogger.LogTime(string.Format("++++++++++++场景：{0}====下载失败！ ", _curData.Cfg.Name));
                    }
                }
                yield return new WaitForSeconds(1);
            }
        }

        private void OnDownloadCallback(string path, int result, object obj)
        {
            FileClasses fc = obj as FileClasses;
            fc.AssetsPath = path;
            fc.ErrorCode = result;
            string name = string.Empty;
            string[] strs = path.Split('/');
            for (int i = 0; i < strs.Length; i++)
            {
                if (strs[i].Contains(AssetConstDefine.ExtUnity3d))
                {
                    name = strs[i].Replace(AssetConstDefine.ExtUnity3d,"");
                }
            }
            //FLogger.LogTime(string.Format("++++++++++++场景资源下载结果回调：{0} ", name));
            if (_curData != null)
            {
                if (fc.ErrorCode == CodeDefine.RET_BACKDOWNLOAD_SUCCESS)
                {
                    //下载成功了 可以进行场景缓存
                    _curData.Result = SceneDownLoadResult.Success;
                    //GameCenter.CacheSceneSystem.PreLoadSceneForCache(path, (ret)=> {
                    //    data.IsCacheOver = true;
                    //});
                    _curData.IsCacheOver = true;
                    //FLogger.LogTime("场景资源后台下载成功了！");
                }
                else if (fc.ErrorCode == CodeDefine.RET_BACKDOWNLOAD_ALREADYEXIST)
                {
                    _curData.Result = SceneDownLoadResult.Success;
                    _curData.IsCacheOver = true;
                    //FLogger.LogTime("场景资源后台下载 资源已经存在！");
                }
                else
                {
                    //下载失败或者下载暂停了
                    _curData.Result = SceneDownLoadResult.Fail;
                    _curData.IsCacheOver = true;
                    //FLogger.LogTime("场景资源后台下载失败了！");
                }
            }
        }

        private SceneBackLoadData GetData()
        {
            SceneBackLoadData data = null;
            if (_dataList.Count > 0)
            {
                data = _dataList[0];
            }
            return data;
        }

        private int GetDataCount()
        {
            return _dataList.Count;
        }

        private SceneBackLoadData GetDataByName(string name)
        {
            SceneBackLoadData data = null;
            for (int i = _dataList.Count - 1; i >= 0; i--)
            {
                if (name == _dataList[i].Cfg.ResName)
                {
                    data = _dataList[i];
                }
            }
            return data;
        }
        private void DownLoadSucess(SceneBackLoadData data)
        {
            for (int i = _dataList.Count - 1; i >= 0; i--)
            {
                if (_dataList[i].Cfg.ResName == data.Cfg.ResName)
                {
                    _dataList.RemoveAt(i);
                }
            }
            //FLogger.LogTime(string.Format("++++++++++++场景：{0}====下载成功！ ", data.Cfg.Name));
        }
        #endregion
    }
}