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

/// <summary>
/// 文件帮助类
/// </summary>
public static class FileHelper
{
    #region 私有属性

    /// <summary>
    /// 缓存/缓冲区
    /// </summary>
    private static byte[] m_CacheBuffer = new byte[4096];

    #endregion
    
    #region 公有方法
    
    /// <summary>
    /// 获取所有数据
    /// </summary>
    /// <param name="_filePath"></param>
    /// <returns></returns>
    public static string GetAllDataInfo(string _filePath)
    {
        if (string.IsNullOrEmpty(_filePath))
        {
            return String.Empty;
        }

        return File.ReadAllText(_filePath);
    }
    
    /// <summary>
    /// 从StreamingAssets文件夹下获取数据信息(IO模式)
    /// </summary>
    /// <param name="_path">路径集合，不需要填写streamingAssetsPath</param>
    /// <returns></returns>
    public static string GetAllDataInfoForStreamingAssets(params string[] _filePath)
    {
        if (_filePath.Length <= 0)
        {
            return string.Empty;
        }

        string result = String.Empty;

        result = GetAllDataInfo(Application.streamingAssetsPath + "/" + PathHelper.CombineFilePath(_filePath));
        
        return result;
    }

    /// <summary>
    /// 将对应文件转换为二进制数组
    /// </summary>
    /// <param name="_filePath"></param>
    /// <returns></returns>
    public static byte[] GetAllBytes(string _filePath)
    {
        return File.ReadAllBytes(_filePath);
    }

    /// <summary>
    /// 获取指定文件夹下所有指定类型的文件
    /// </summary>
    /// <param name="_searchPattern">文件后缀，带点号</param>
    /// <param name="_paths"></param>
    /// <returns></returns>
    public static FileInfo[] GetFileOfSpecifiedType(string _searchPattern, params string[] _paths)
    {
        string folderPath = PathHelper.CombineFilePath(_paths).Replace('/', '\\');

        return GetAllFileInfo(_searchPattern, folderPath);
    }
    
    /// <summary>
    /// 获取指定文件夹下所有指定类型的文件
    /// </summary>
    /// <param name="_searchPattern">文件后缀，带点号</param>
    /// <param name="_folderPath"></param>
    /// <returns></returns>
    public static FileInfo[] GetFileOfSpecifiedType(string _searchPattern, string _folderPath)
    {
        return GetAllFileInfo(_searchPattern, _folderPath);
    }

    /// <summary>
    /// 保存文本文件到本地
    /// </summary>
    /// <param name="_targetContent"></param>
    /// <param name="_paths"></param>
    public static void SaveTextToFile(string _targetContent, params string[] _paths)
    {
        if (string.IsNullOrEmpty(_targetContent) || _paths.Length <= 0)
        {
            return;
        }
        
        // 合并路径
        string savePath = PathHelper.CombineFilePath(_paths);
        
        // 获取文件夹路径
        string foldrePath = Path.GetDirectoryName(savePath);
        
        // 判断文件夹是否存在
        if (!Directory.Exists(foldrePath))
        {
            // 创建文件夹
            Directory.CreateDirectory(foldrePath);
        }
        
        // 写入文件
        File.WriteAllText(savePath,_targetContent);
    }

    /// <summary>
    /// 写入Json数据
    /// </summary>
    /// <param name="_t"></param>
    /// <param name="_paths"></param>
    /// <typeparam name="T"></typeparam>
    public static void WriteJsonData<T>(T _t, params string[] _paths)
    {
        if (_t == null || _paths.Length <= 0)
        {
            return;
        }
        
        // 合并路径
        string filePath = PathHelper.CombineFilePath(_paths);

        if (!File.Exists(filePath))
        {
            return;
        }
        
        string tmpContent = JsonUtility.ToJson(_t).Replace(@"\\r\\n",@"\r\n");

        using (StreamWriter streamWriter = new StreamWriter(filePath))
        {
            streamWriter.Write(tmpContent);
        }
    }

    /// <summary>
    /// 拷贝文件到对应位置
    /// </summary>
    /// <param name="_sourceFilePath">源文件路径</param>
    /// <param name="_destinationPath">目标文件夹路径</param>
    /// <returns>返回拷贝文件的名称</returns>
    public static string CopeFileTocorrespondlocation(string _sourceFilePath, string _destinationPath)
    {
        if (string.IsNullOrEmpty(_sourceFilePath) || string.IsNullOrEmpty(_destinationPath))
        {
            return String.Empty;
        }
        
        // 调用删除方法
        DeleteFilewithSameName(_sourceFilePath, _destinationPath);

        string tmpFileName = GetSourceFileName(_sourceFilePath);
        
        string tmpCompletePath = GetDestinationFilePath(tmpFileName, _destinationPath);
        
        // 拷贝文件
        File.Copy(_sourceFilePath,tmpCompletePath,true);
        
        return tmpFileName;
    }
    
    /// <summary>
    /// 通过协程的形式上传文件
    /// </summary>
    /// <param name="_sourceFilePath"></param>
    /// <param name="_destinationPath"></param>
    /// <param name="_action">返回音频文件名</param>
    /// <param name="_progressBar"></param>
    /// <returns></returns>
    public static IEnumerator UploadFileCoroutine(string _sourceFilePath, string _destinationPath,Action<string> _action,Action<float> _progressBar)
    {
        if (string.IsNullOrEmpty(_sourceFilePath) || string.IsNullOrEmpty(_destinationPath))
        {
            yield return null;
        }

        DeleteFilewithSameName(_sourceFilePath, _destinationPath);
        
        string tmpFileName = GetSourceFileName(_sourceFilePath);
        
        string tmpCompletePath = GetDestinationFilePath(tmpFileName, _destinationPath);

        if (_action != null)
        {
            _action.Invoke(tmpFileName);
        }

        if (string.IsNullOrEmpty(_sourceFilePath))
        {
            yield return null;
        }
        
        // 文件拷贝操作
        using (FileStream sourceFile = File.OpenRead(_sourceFilePath))
        {
            using (FileStream destinationFile=File.Create(tmpCompletePath))
            {
                // 获取源文件大小
                long totalSourceLength = sourceFile.Length;
                
                // 记录拷贝数值
                long bytesCopied = 0;

                while (bytesCopied < totalSourceLength)
                {
                    // 读取源文件中的数据到缓冲区
                    int bytesRead = sourceFile.Read(m_CacheBuffer, 0, m_CacheBuffer.Length);
                    
                    // 写入缓冲区数据到目标文件
                    destinationFile.Write(m_CacheBuffer, 0, bytesRead);
                    
                    // 修订拷贝长度
                    bytesCopied += bytesRead;
                    
                    // 计算加载进度
                    if (_progressBar != null)
                    {
                        _progressBar.Invoke((float)bytesCopied / (float)totalSourceLength);
                    }

                    yield return null;
                }
            }
        }
    }
    
    /// <summary>
    /// 删除目标文件夹下与传入文件名相同的文件
    /// </summary>
    /// <param name="_sourceFilePath">源文件路径</param>
    /// <param name="_folderPath">目标文件夹</param>
    public static void DeleteFilewithSameName(string _sourceFilePath,string _folderPath)
    {
        if (string.IsNullOrEmpty(_sourceFilePath) || string.IsNullOrEmpty(_folderPath))
        {
            return;
        }
    
        // 获取源文件名
        string sourceFileName = Path.GetFileName(_sourceFilePath);

        // 获取指定文件夹下所有的文件
        FileInfo[] fileInfos = GetFileOfSpecifiedType(sourceFileName.Split('.')[1], _folderPath);

        // 目标文件夹无数据
        if (fileInfos.Length <= 0)
        {
            return;
        }
        
        for (int i = 0; i < fileInfos.Length; i++)
        {
            // 获取文件名 如果相同，则直接删除
            if (sourceFileName.Equals(Path.GetFileName(fileInfos[i].FullName)))
            {
                DeleteLocalFile(fileInfos[i].FullName);
                return;
            }
        }
    }
    
    /// <summary>
    /// 删除文件
    /// </summary>
    /// <param name="_folderPath"></param>
    /// <param name="_fileName">带后缀文件名</param>
    public static void DeleteFile(string _folderPath,string _fileName)
    {
        if (string.IsNullOrEmpty(_folderPath) || string.IsNullOrEmpty(_fileName))
        {
            return;
        }

        string filePath = PathHelper.CombineFilePath(PathHelper.m_ReadOnlyPath, _folderPath, _fileName);
        
        DeleteLocalFile(filePath);
    }
    
    #endregion

    #region 私有方法

    /// <summary>
    /// 本地是否存在指定文件
    /// </summary>
    /// <param name="_filePath"></param>
    /// <returns></returns>
    private static bool LoaclIsExistFile(string _filePath)
    {
        return File.Exists(_filePath);
    }

    /// <summary>
    /// 删除本地指定文件
    /// </summary>
    /// <param name="_filePath"></param>
    private static void DeleteLocalFile(string _filePath)
    {
        if (LoaclIsExistFile(_filePath))
        {
            File.Delete(_filePath);
        }
    }
    
    /// <summary>
    /// 获取指定文件夹下的所有文件信息
    /// </summary>
    /// <param name="_searchPattern"></param>
    /// <param name="_folderPath"></param>
    /// <returns></returns>
    private static FileInfo[] GetAllFileInfo(string _searchPattern, string _folderPath)
    {
        // 获取指定文件夹信息
        DirectoryInfo tmpDirectoryInfo = new DirectoryInfo(_folderPath);
        // 获取文件夹下所有的文件信息
        FileInfo[] tmpFileInfos = tmpDirectoryInfo.GetFiles("*" + _searchPattern, SearchOption.AllDirectories);

        return tmpFileInfos;
    }

    /// <summary>
    /// 获取构建目标文件完整路径
    /// </summary>
    /// <param name="_sourceFilePath"></param>
    /// <param name="_destinationPath"></param>
    /// <returns>返回源文件文件名和构建后的目标我呢见完整路径</returns>
    private static string GetDestinationFilePath(string _sourceFileName, string _destinationPath)
    {
        // 构建目标文件完整路径
        string destinationFilePath = PathHelper.CombineFilePath(_destinationPath, _sourceFileName);

        return PathHelper.CombineFilePath(_destinationPath, _sourceFileName);
    }

    /// <summary>
    /// 获取源文件文件名
    /// </summary>
    /// <param name="_sourceFilePath"></param>
    /// <returns></returns>
    private static string GetSourceFileName(string _sourceFilePath)
    {
        return Path.GetFileName(_sourceFilePath);
    }
    #endregion
}