using Microsoft.AspNetCore.Http;
using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Admin.Core.Common
{
    public class FileHelper : IDisposable
    {
        private bool _alreadyDispose = false;

        #region 构造函数
        public FileHelper()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }
        ~FileHelper()
        {
            Dispose(); ;
        }

        protected virtual void Dispose(bool isDisposing)
        {
            if (_alreadyDispose) return;
            _alreadyDispose = true;
        }
        #endregion

        #region IDisposable 成员

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        #endregion

        #region 取得文件后缀名
        /****************************************
          * 函数名称：GetPostfixStr
          * 功能说明：取得文件后缀名
          * 参     数：filename:文件名称
          * 调用示列：
          *            string filename = "aaa.aspx";        
          *            string s = EC.FileObj.GetPostfixStr(filename);         
         *****************************************/
        /// <summary>
        /// 取后缀名
        /// </summary>
        /// <param name="filename">文件名</param>
        /// <returns>.gif|.html格式</returns>
        public static string GetPostfixStr(string filename)
        {
            int start = filename.LastIndexOf(".");
            int length = filename.Length;
            string postfix = filename.Substring(start, length - start);
            return postfix;
        }
        #endregion

        #region 根据文件大小获取指定前缀的可用文件名
        /// <summary>
        /// 根据文件大小获取指定前缀的可用文件名
        /// </summary>
        /// <param name="folderPath">文件夹</param>
        /// <param name="prefix">文件前缀</param>
        /// <param name="size">文件大小(1m)</param>
        /// <param name="ext">文件后缀(.log)</param>
        /// <returns>可用文件名</returns>
        public static string GetAvailableFileWithPrefixOrderSize(string folderPath, string prefix, int size = 1 * 1024 * 1024, string ext = ".log")
        {
            var allFiles = new DirectoryInfo(folderPath);
            var selectFiles = allFiles.GetFiles().Where(fi => fi.Name.ToLower().Contains(prefix.ToLower()) && fi.Extension.ToLower() == ext.ToLower() && fi.Length < size).OrderByDescending(d => d.Name).ToList();

            if (selectFiles.Count > 0)
            {
                return selectFiles.FirstOrDefault().FullName;
            }

            return Path.Combine(folderPath, $@"{prefix}_{DateTime.Now.DateToTimeStamp()}.log");
        }
        public static string GetAvailableFileNameWithPrefixOrderSize(string _contentRoot, string prefix, int size = 1 * 1024 * 1024, string ext = ".log")
        {
            var folderPath = Path.Combine(_contentRoot, "Log");
            if (!Directory.Exists(folderPath))
            {
                Directory.CreateDirectory(folderPath);
            }

            var allFiles = new DirectoryInfo(folderPath);
            var selectFiles = allFiles.GetFiles().Where(fi => fi.Name.ToLower().Contains(prefix.ToLower()) && fi.Extension.ToLower() == ext.ToLower() && fi.Length < size).OrderByDescending(d => d.Name).ToList();

            if (selectFiles.Count > 0)
            {
                return selectFiles.FirstOrDefault().Name.Replace(".log", "");
            }

            return $@"{prefix}_{DateTime.Now.DateToTimeStamp()}";
        }
        #endregion

        #region 写文件
        /****************************************
          * 函数名称：WriteFile
          * 功能说明：写文件,会覆盖掉以前的内容
          * 参     数：Path:文件路径,Strings:文本内容
          * 调用示列：
          *            string Path = Server.MapPath("Default2.aspx");       
          *            string Strings = "这是我写的内容啊";
          *            EC.FileObj.WriteFile(Path,Strings);
         *****************************************/
        /// <summary>
        /// 写文件
        /// </summary>
        /// <param name="Path">文件路径</param>
        /// <param name="Strings">文件内容</param>
        public static void WriteFile(string Path, string Strings)
        {
            if (!File.Exists(Path))
            {
                FileStream f = File.Create(Path);
                f.Close();
            }
            StreamWriter f2 = new StreamWriter(Path, false, System.Text.Encoding.GetEncoding("gb2312"));
            f2.Write(Strings);
            f2.Close();
            f2.Dispose();
        }

        /// <summary>
        /// 写文件
        /// </summary>
        /// <param name="Path">文件路径</param>
        /// <param name="Strings">文件内容</param>
        /// <param name="encode">编码格式</param>
        public static void WriteFile(string Path, string Strings, Encoding encode)
        {
            if (!File.Exists(Path))
            {
                FileStream f = File.Create(Path);
                f.Close();
            }
            StreamWriter f2 = new StreamWriter(Path, false, encode);
            f2.Write(Strings);
            f2.Close();
            f2.Dispose();
        }
        #endregion

        #region 读文件
        /****************************************
          * 函数名称：ReadFile
          * 功能说明：读取文本内容
          * 参     数：Path:文件路径
          * 调用示列：
          *            string Path = Server.MapPath("Default2.aspx");       
          *            string s = EC.FileObj.ReadFile(Path);
         *****************************************/
        /// <summary>
        /// 读文件
        /// </summary>
        /// <param name="Path">文件路径</param>
        /// <returns></returns>
        public static string ReadFile(string Path)
        {
            string s = "";
            if (!File.Exists(Path))
                s = "不存在相应的目录";
            else
            {
                StreamReader f2 = new StreamReader(Path, System.Text.Encoding.GetEncoding("gb2312"));
                s = f2.ReadToEnd();
                f2.Close();
                f2.Dispose();
            }

            return s;
        }

        /// <summary>
        /// 读文件
        /// </summary>
        /// <param name="Path">文件路径</param>
        /// <param name="encode">编码格式</param>
        /// <returns></returns>
        public static string ReadFile(string Path, Encoding encode)
        {
            string s = "";
            if (!File.Exists(Path))
                s = "不存在相应的目录";
            else
            {
                StreamReader f2 = new StreamReader(Path, encode);
                s = f2.ReadToEnd();
                f2.Close();
                f2.Dispose();
            }

            return s;
        }
        #endregion

        #region 追加文件
        /****************************************
          * 函数名称：FileAdd
          * 功能说明：追加文件内容
          * 参     数：Path:文件路径,strings:内容
          * 调用示列：
          *            string Path = Server.MapPath("Default2.aspx");     
          *            string Strings = "新追加内容";
          *            EC.FileObj.FileAdd(Path, Strings);
         *****************************************/
        /// <summary>
        /// 追加文件
        /// </summary>
        /// <param name="Path">文件路径</param>
        /// <param name="strings">内容</param>
        public static void FileAdd(string Path, string strings)
        {
            StreamWriter sw = File.AppendText(Path);
            sw.Write(strings);
            sw.Flush();
            sw.Close();
        }
        #endregion

        #region 拷贝文件
        /****************************************
          * 函数名称：FileCoppy
          * 功能说明：拷贝文件
          * 参     数：OrignFile:原始文件,NewFile:新文件路径
          * 调用示列：
          *            string orignFile = Server.MapPath("Default2.aspx");     
          *            string NewFile = Server.MapPath("Default3.aspx");
          *            EC.FileObj.FileCoppy(OrignFile, NewFile);
         *****************************************/
        /// <summary>
        /// 拷贝文件
        /// </summary>
        /// <param name="OrignFile">原始文件</param>
        /// <param name="NewFile">新文件路径</param>
        public static void FileCoppy(string orignFile, string NewFile)
        {
            File.Copy(orignFile, NewFile, true);
        }

        #endregion

        #region 删除文件
        /****************************************
          * 函数名称：FileDel
          * 功能说明：删除文件
          * 参     数：Path:文件路径
          * 调用示列：
          *            string Path = Server.MapPath("Default3.aspx");    
          *            EC.FileObj.FileDel(Path);
         *****************************************/
        /// <summary>
        /// 删除文件
        /// </summary>
        /// <param name="Path">路径</param>
        public static void FileDel(string Path)
        {
            File.Delete(Path);
        }
        #endregion

        #region 移动文件
        /****************************************
          * 函数名称：FileMove
          * 功能说明：移动文件
          * 参     数：OrignFile:原始路径,NewFile:新文件路径
          * 调用示列：
          *             string orignFile = Server.MapPath("../说明.txt");    
          *             string NewFile = Server.MapPath("http://www.cnAdmins.com/说明.txt");
          *             EC.FileObj.FileMove(OrignFile, NewFile);
         *****************************************/
        /// <summary>
        /// 移动文件
        /// </summary>
        /// <param name="OrignFile">原始路径</param>
        /// <param name="NewFile">新路径</param>
        public static void FileMove(string orignFile, string NewFile)
        {
            File.Move(orignFile, NewFile);
        }
        #endregion

        #region 在当前目录下创建目录
        /****************************************
          * 函数名称：FolderCreate
          * 功能说明：在当前目录下创建目录
          * 参     数：OrignFolder:当前目录,NewFloder:新目录
          * 调用示列：
          *            string orignFolder = Server.MapPath("test/");    
          *            string NewFloder = "new";
          *            EC.FileObj.FolderCreate(OrignFolder, NewFloder);
         *****************************************/
        /// <summary>
        /// 在当前目录下创建目录
        /// </summary>
        /// <param name="OrignFolder">当前目录</param>
        /// <param name="NewFloder">新目录</param>
        public static void FolderCreate(string orignFolder, string NewFloder)
        {
            Directory.SetCurrentDirectory(orignFolder);
            Directory.CreateDirectory(NewFloder);
        }
        #endregion

        #region 递归删除文件夹目录及文件
        /****************************************
          * 函数名称：DeleteFolder
          * 功能说明：递归删除文件夹目录及文件
          * 参     数：dir:文件夹路径
          * 调用示列：
          *            string dir = Server.MapPath("test/");  
          *            EC.FileObj.DeleteFolder(dir);       
         *****************************************/
        /// <summary>
        /// 递归删除文件夹目录及文件
        /// </summary>
        /// <param name="dir"></param>
        /// <returns></returns>
        public static void DeleteFolder(string dir)
        {
            if (Directory.Exists(dir)) //如果存在这个文件夹删除之
            {
                foreach (string d in Directory.GetFileSystemEntries(dir))
                {
                    if (File.Exists(d))
                        File.Delete(d); //直接删除其中的文件
                    else
                        DeleteFolder(d); //递归删除子文件夹
                }
                Directory.Delete(dir); //删除已空文件夹
            }

        }
        #endregion

        #region 将指定文件夹下面的所有内容copy到目标文件夹下面 果目标文件夹为只读属性就会报错。
        /****************************************
          * 函数名称：CopyDir
          * 功能说明：将指定文件夹下面的所有内容copy到目标文件夹下面 果目标文件夹为只读属性就会报错。
          * 参     数：srcPath:原始路径,aimPath:目标文件夹
          * 调用示列：
          *            string srcPath = Server.MapPath("test/");  
          *            string aimPath = Server.MapPath("test1/");
          *            EC.FileObj.CopyDir(srcPath,aimPath);   
         *****************************************/
        /// <summary>
        /// 指定文件夹下面的所有内容copy到目标文件夹下面
        /// </summary>
        /// <param name="srcPath">原始路径</param>
        /// <param name="aimPath">目标文件夹</param>
        public static void CopyDir(string srcPath, string aimPath)
        {
            try
            {
                // 检查目标目录是否以目录分割字符结束如果不是则添加之
                if (aimPath[aimPath.Length - 1] != Path.DirectorySeparatorChar)
                    aimPath += Path.DirectorySeparatorChar;
                // 判断目标目录是否存在如果不存在则新建之
                if (!Directory.Exists(aimPath))
                    Directory.CreateDirectory(aimPath);
                // 得到源目录的文件列表，该里面是包含文件以及目录路径的一个数组
                //如果你指向copy目标文件下面的文件而不包含目录请使用下面的方法
                //string[] fileList = Directory.GetFiles(srcPath);
                string[] fileList = Directory.GetFileSystemEntries(srcPath);
                //遍历所有的文件和目录
                foreach (string file in fileList)
                {
                    //先当作目录处理如果存在这个目录就递归Copy该目录下面的文件

                    if (Directory.Exists(file))
                        CopyDir(file, aimPath + Path.GetFileName(file));
                    //否则直接Copy文件
                    else
                        File.Copy(file, aimPath + Path.GetFileName(file), true);
                }

            }
            catch (Exception ee)
            {
                throw new Exception(ee.ToString());
            }
        }
        #endregion

        /// <summary>
        /// 获取AppDomain.CurrentDomain.BaseDirectory绝对路径
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static string GetAbsolutePath()
        {
            return AppDomain.CurrentDomain.BaseDirectory;
        }

        /// <summary>
        /// 获取当前程序绝对路径
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static string GetProgramPath()
        {
            return Directory.GetCurrentDirectory();
        }

        /// <summary>
        /// 判断目标文件夹是否存在 如果不存在则创建
        /// </summary>
        /// <param name="aimPath"></param>
        public static void CreateFolder(string aimPath)
        {
            if (!Directory.Exists(aimPath)) Directory.CreateDirectory(aimPath);
        }

        /// <summary>
        /// 判断目标文件是否存在 如果不存在则创建
        /// </summary>
        /// <param name="filePath"></param>
        public static void CreateFile(string filePath)
        {
            if (!File.Exists(filePath))
            {
                FileStream f = File.Create(filePath);
                f.Close();
            }
        }

        /// <summary>
        /// 判断文件是否存在
        /// </summary>
        /// <param name="filepath"></param>
        /// <returns></returns>
        public static bool IsExists(string filepath)
        {
            return filepath.IsNotEmptyOrNull() && File.Exists(filepath);
        }

        /// <summary>
        /// 创建上传文件
        /// </summary>
        /// <param name="fullPath"></param>
        /// <param name="file"></param>
        public static void CreateFile(string fullPath, IFormFile file)
        {
            using var fs = new FileStream(fullPath, FileMode.Create);
            // 复制文件
            file.CopyTo(fs);
            // 清空缓冲区数据
            fs.Flush();
            fs.Dispose();
        }

        /// <summary>
        /// 获取文件类型
        /// </summary>
        /// <param name="FilenameExtension"></param>
        /// <returns></returns>
        public static string GetContentType(string FilenameExtension)
        {
            return FilenameExtension switch
            {
                ".bmp" => "image/bmp",
                ".gif" => "image/gif",
                ".jpeg" => "image/jpeg",
                ".jpg" => "image/jpeg",
                ".png" => "image/jpeg",
                ".html" => "text/html",
                ".txt" => "text/plain",
                ".vsd" => "application/vnd.visio",
                ".pptx" => "application/vnd.ms-powerpoint",
                ".ppt" => "application/vnd.ms-powerpoint",
                ".docx" => "application/msword",
                ".doc" => "application/msword",
                ".xml" => "text/xml",
                ".mp4" => "video/mp4",
                ".ogg" => "video/ogg",
                ".flv" => "video/flv",
                ".avi" => "video/avi",
                ".wmv" => "video/wmv",
                ".rmvb" => "video/rmvb",
                ".mov" => "video/mov",
                _ => "image/jpeg"
            };
        }

        /// <summary>
        /// 根据文件类型获取后缀名
        /// </summary>
        /// <param name="FilenameExtension"></param>
        /// <returns></returns>
        public static string GetExt(string FilenameExtension)
        {
            return FilenameExtension switch
            {
                "image/bmp" => ".bmp",
                "image/gif" => ".gif",
                "image/jpeg" => ".jpeg",
                "text/html" => ".html",
                "text/plain" => ".txt",
                "application/vnd.visio" => ".vsd",
                "application/vnd.ms-powerpoint" => ".pptx",
                "application/msword" => ".docx",
                "text/xml" => ".xml",
                "video/mp4" => ".mp4",
                "video/ogg" => ".ogg",
                "video/flv" => ".flv",
                "video/avi" => ".avi",
                "video/wmv" => ".wmv",
                "video/rmvb" => ".rmvb",
                "video/mov" => ".mov",
                _ => ".jpeg",
            };
        }

        /// <summary>
        ///     获取图片名
        /// </summary>
        /// <param name="imageName"></param>
        /// <returns></returns>
        public static string GetPicKey(string imageName)
        {
            imageName = imageName.Replace("https://", "");
            imageName = imageName.Replace("http://", "");
            imageName = imageName.Replace(GetPostfixStr(imageName), "");
            return imageName;
        }

        /// <summary>
        /// 保存单文件
        /// </summary>
        /// <param name="files"></param>
        /// <param name="webRootPath"></param>
        /// <returns></returns>
        public static async Task<MessageModel<string>> FileSaveByBlob(IFormFileCollection files, string webRootPath = "")
        {
            MessageModel<string> model = new MessageModel<string>();

            try
            {
                //文件夹相对路径
                var fileRoot = GetFileRoot(FileActionType.Up);
                //文件夹绝对路径
                webRootPath = webRootPath.IsNotEmptyOrNull() ? webRootPath : GetProgramPath() + fileRoot;

                //获取Form提交的文件
                long size = files.Sum(f => f.Length);
                string showfilePath = string.Empty;
                foreach (var formFile in files)
                {
                    if (formFile.Length > 0)
                    {
                        //获取文件后缀名
                        var fileExt = GetExt(formFile.ContentType);
                        //随机生成新的文件名
                        string newFileName = System.Guid.NewGuid().ToString() + fileExt;
                        #region 文件夹不存在则创建
                        var filePath = webRootPath;
                        if (!Directory.Exists(filePath))
                        {
                            Directory.CreateDirectory(filePath);
                        }
                        #endregion
                        #region 文件不存在则新建
                        filePath = webRootPath + newFileName;
                        showfilePath = fileRoot + newFileName;
                        CreateFile(filePath);
                        #endregion
                        //把上传的文件复制到指定的文件夹中
                        using (var stream = new FileStream(filePath, FileMode.Create))
                        {
                            await formFile.CopyToAsync(stream);
                        }
                    }
                }
                model.success = true;
                model.data = showfilePath;
            }
            catch
            {
                model.success = false;
                model.data = "文件上传失败！";
            }
            return model;
        }

        /// <summary>
        /// 获取文件相对路径
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        public static string GetFileRoot(FileActionType type)
        {
            //根文件夹
            var rootPath = Appsettings.app(new string[] { "AppSettings", "FileRootPath" });
            switch (type)
            {
                //上传类型文件夹
                case FileActionType.Up:
                    return rootPath + SysConst.SYS_FILE_UPLOAD_PATH;
                //下载类型文件夹
                case FileActionType.Dow:
                    return rootPath + SysConst.SYS_FILE_EXPORT_PATH;
                default:
                    return "";
            }
        }
    }
}