using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.IO;
using AIPagedLod;
using UnityEngine.UI;
using System.Xml;
public class RuntimeDataLoader : MonoBehaviour
{
    public bool mIsAutoLoad = false;
    public DataPathInfo mDataPathInfo;
    public bool mIsLoadFinished = false;
    public Vector3 mCenterPosition = Vector3.zero;
    public GameObject mDataLoadInfoItem;

    private GameObject mLoadManagerPrefab;
    private LoadPagedLodFromFileManager mCurrentLoadManager;
    private List<PagedLodFileLoader> mNeedPagedLodLoaderList = new List<PagedLodFileLoader>();
    private int mCurrentTileIndex = 0;
    private int mLoadedCount = 0;
    private bool mIsGetNeedLoadFiles = false;
    private Vector3 mMinPos = Vector3.zero;
    private Vector3 mMaxPos = Vector3.zero;

    void Start()
    {
        if(mIsAutoLoad)
        {
            StartLoad();
        }
    }

    public void StartLoad()
    {
        if (PagedLodConfig.mInstance.mDataPathDict.ContainsKey(mDataPathInfo.mDataName))
        {
            mDataPathInfo = PagedLodConfig.mInstance.mDataPathDict[mDataPathInfo.mDataName];
        }

        mLoadManagerPrefab = Resources.Load("LoadManagerPrefab") as GameObject;
        GameObject loadManagerObject = GameObject.Instantiate(mLoadManagerPrefab);
        LoadPagedLodFromFileManager loadManager = loadManagerObject.GetComponent<LoadPagedLodFromFileManager>();
        loadManagerObject.transform.SetParent(transform);
        loadManagerObject.transform.localPosition = Vector3.zero;
        loadManagerObject.transform.localEulerAngles = Vector3.zero;
        loadManagerObject.transform.localScale = Vector3.one;
        loadManager.mConfig.mDataName = mDataPathInfo.mDataName;
        loadManager.mConfig.mDataPath = mDataPathInfo.mDataPath; 
        loadManager.mConfig.mStartLevel = LoadPagedLodFromFileManager.GetDataStartLevel(mDataPathInfo.mDataPath);
        loadManager.mConfig.mIsUpdate = false;
        loadManager.mConfig.mIsDaJiangData = mDataPathInfo.mIsDaJiangData;
        mCurrentLoadManager = loadManager;
        GetNeedLoadFiles();
        GetDataCenterFromConfigFile();
    }
    void GetDataCenterFromConfigFile()
    {
        string dataPath = mDataPathInfo.mDataPath;
        string configFile = Directory.GetParent(dataPath).FullName + "/DataCenter.xml";
        if (File.Exists(configFile))
        {
            string[] strCenters = File.ReadAllText(configFile, System.Text.Encoding.ASCII).Split(',');
            mCenterPosition.x = float.Parse(strCenters[0]);
            mCenterPosition.y = float.Parse(strCenters[1]);
            mCenterPosition.z = float.Parse(strCenters[2]);
            if (LoadDataRumtime.mSetCameraPositionFlag)
            {
                LoadDataRumtime.SetCameraToCenter(mCenterPosition);
                LoadDataRumtime.mSetCameraPositionFlag = false;
            }
        }
    }
    public void SaveDataCenterToConfigFile()
    {
        string dataPath = mDataPathInfo.mDataPath;
        string configFile = Directory.GetParent(dataPath).FullName + "/DataCenter.xml";
        StreamWriter sw = new StreamWriter(configFile);
        string strCenter = mCenterPosition.x.ToString() +"," + mCenterPosition.y.ToString() + "," + mCenterPosition.z.ToString();
        sw.Write(strCenter);
        sw.Flush();
        sw.Close();
    }
    void GetNeedLoadFilesFromConfigFile(string configFile ,int loadMinLevel)
    {
        string dataPath = mDataPathInfo.mDataPath;
        string[] subFiles = File.ReadAllLines(configFile, System.Text.Encoding.ASCII);
        for (int i = 0; i < subFiles.Length; ++i)
        {
            string fileName = dataPath + "/" + subFiles[i];
            if (File.Exists(fileName))
            {
                FileInfo fileInfo = new FileInfo(fileName);
                PagedLodFileLoader pagedLodLoader = PagedLodFileLoader.GetPagedLodFileLoader(fileInfo, loadMinLevel,
                fileInfo.Directory.Name, mCurrentLoadManager.mConfig.mIsDaJiangData);
                mNeedPagedLodLoaderList.Add(pagedLodLoader);
            }
        }
    }
    void GetNeedLoadFileFromDir(string dataPath, int loadMinLevel)
    {
        DirectoryInfo dataDir = new DirectoryInfo(dataPath);
        List<DirectoryInfo> dirInfos = new List<DirectoryInfo>(dataDir.GetDirectories());
        for (int i = 0; i < dirInfos.Count; ++i)
        {
            DirectoryInfo tileDir = dirInfos[i];
            if (loadMinLevel <= 0)
            {
                string fileName = tileDir.FullName + "/" + tileDir.Name + PagedLodConfig.mInstance.GetFileSufix();
                if (File.Exists(fileName))
                {
                    FileInfo fileInfo = new FileInfo(fileName);
                    PagedLodFileLoader pagedLodLoader = PagedLodFileLoader.GetPagedLodFileLoader(fileInfo, mCurrentLoadManager.mConfig.mStartLevel,
                                    tileDir.Name, mCurrentLoadManager.mConfig.mIsDaJiangData);
                    mNeedPagedLodLoaderList.Add(pagedLodLoader);
                }
            }
            else
            {
                bool isExist = false;
                foreach (var fileInfo in tileDir.GetFiles("*"+ PagedLodConfig.mInstance.GetFileSufix()))
                {
                    int level = LoadPagedLodFromFileManager.GetTileFileLevel(tileDir.Name, fileInfo.Name);
                    if (level == loadMinLevel)
                    {
                        PagedLodFileLoader pagedLodLoader = PagedLodFileLoader.GetPagedLodFileLoader(fileInfo, level,
                                                            tileDir.Name, mCurrentLoadManager.mConfig.mIsDaJiangData);
                        mNeedPagedLodLoaderList.Add(pagedLodLoader);
                        isExist = true;
                    }
                    if (level > loadMinLevel)
                    {
                        if (!isExist)
                        {
                            Debug.Log(tileDir.Name + " StartLevel " + loadMinLevel + " Not Exist File ");
                        }
                        break;
                    }
                }
            }
        }
    }

    void GetNeedLoadFiles()
    {
        PagedLodThreadPool.RunAsync(() =>
        {
            string dataPath = mDataPathInfo.mDataPath;            
            int loadMinLevel = mDataPathInfo.mMinLevel;
            string configFile = Directory.GetParent(dataPath).FullName + string.Format("/DataFileIndex_{0}.xml", loadMinLevel);
            if (loadMinLevel <= 0) //加载数据起始层级
            {
                GetNeedLoadFileFromDir(dataPath, loadMinLevel);
            }
            else //加载指定最小层级
            {
                if (File.Exists(configFile))
                {
                    GetNeedLoadFilesFromConfigFile(configFile, loadMinLevel);
                }
                else
                {
                    GetNeedLoadFileFromDir(dataPath, loadMinLevel);
                }
            }              
            PagedLodThreadPool.QueueOnMainThread(() =>
            {
                mIsGetNeedLoadFiles = true;
            });
        });
    }
    void Update()
    {
        if (!mIsGetNeedLoadFiles) return;
        if (mIsLoadFinished) return;

        List<PagedLodFileLoader> pagedLodLoaderList = new List<PagedLodFileLoader>();
        for (int i = 0; i < 10; ++i)
        {
            if (mCurrentTileIndex < mNeedPagedLodLoaderList.Count)
            {
                pagedLodLoaderList.Add(mNeedPagedLodLoaderList[mCurrentTileIndex]);
                mCurrentTileIndex++;
            }
        }
        PagedLodThreadPool.RunAsync(() =>
        {
            for (int i = 0; i < pagedLodLoaderList.Count; ++i)
            {
                pagedLodLoaderList[i].LoadObjectBasicInfo();
                pagedLodLoaderList[i].LoadObjectMeshInfo();
                mNeedPagedLodLoaderList[i].StartLoad();
            }
            PagedLodThreadPool.QueueOnMainThread(() =>
            {
                for (int i = 0; i < pagedLodLoaderList.Count; ++i)
                {
                    LoadPagedLod(pagedLodLoaderList[i]);
                    mLoadedCount++;
                    SetItemText("正在加载:" + InfoToText());
                    if (mLoadedCount == mNeedPagedLodLoaderList.Count)
                    {
                        mIsLoadFinished = true;
                        StartUpdateLod();
                        if (mCenterPosition == Vector3.zero)
                        {
                            mCenterPosition = (mMinPos + mMaxPos) / 2;
                            mCenterPosition.y = mMinPos.y;
                            mCenterPosition = GetHitPosition(mCenterPosition);
                            SaveDataCenterToConfigFile();
                        }
                    }
                }
                for (int i = 0; i < pagedLodLoaderList.Count; ++i)
                {
                    pagedLodLoaderList[i].Dispose();
                    pagedLodLoaderList[i] = null;
                }
            });
        });
    }

    void SetItemText(string text)
    {
        if (mDataLoadInfoItem != null)
        {
            mDataLoadInfoItem.GetComponentInChildren<Text>().text = text;
        }
    }

    void LoadPagedLod(PagedLodFileLoader loader)
    {
        PagedLod pagedLod = LoadPagedLodFromFileManager.LoadPagedLod(loader, mCurrentLoadManager.transform);
        if (PagedLodConfig.mInstance.mTileDataType == TileDataType.OSGB)
        {
            pagedLod.LoadOsgbBasicInfo(loader);
        }
        else
        {
            pagedLod.LoadTileSetJsonFile();
            pagedLod.LoadB3dmBasicInfo(loader);
        }

        pagedLod.GetMeshRenders();
        pagedLod.mIsRootTile = true;
        LoadPagedLodFromFileManager.GenerateColliderObject(pagedLod);

        if (mCenterPosition == Vector3.zero)
        {
            if (mMinPos == Vector3.zero)
            {
                mMinPos = pagedLod.mWorldCenter;
                mMaxPos = pagedLod.mWorldCenter;
            }
            else
            {
                mMinPos.x = Mathf.Min(mMinPos.x, pagedLod.mWorldCenter.x);
                mMinPos.y = Mathf.Min(mMinPos.y, pagedLod.mWorldCenter.y);
                mMinPos.z = Mathf.Min(mMinPos.z, pagedLod.mWorldCenter.z);

                mMaxPos.x = Mathf.Max(mMaxPos.x, pagedLod.mWorldCenter.x);
                mMaxPos.y = Mathf.Max(mMaxPos.y, pagedLod.mWorldCenter.y);
                mMaxPos.z = Mathf.Max(mMaxPos.z, pagedLod.mWorldCenter.z);
            }
            if (LoadDataRumtime.mSetCameraPositionFlag)
            {
                LoadDataRumtime.SetCameraToCenter(pagedLod.mWorldCenter);
                LoadDataRumtime.mSetCameraPositionFlag = false;
            }
        }
    }

    string InfoToText()
    {
        return mDataPathInfo.mDataName + "(" + mNeedPagedLodLoaderList.Count.ToString() + "/" + mLoadedCount.ToString() + ")";
    }
    public void StartUpdateLod()
    {
        if (mDataPathInfo.mLodEnable)
        {
            mCurrentLoadManager.mConfig.mIsUpdate = true;
        }
    }

    Vector3 GetHitPosition(Vector3 pos)
    {
        RaycastHit hitInfo;
        Vector3 startPos = pos + new Vector3(0, 1000, 0);
        Vector3 endPos = pos + new Vector3(0, -1000, 0);
        if (Physics.Linecast(startPos,endPos,out hitInfo))
        {
            return hitInfo.point;
        }
        return pos;
    }
}