using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Security.AccessControl;
using System.Security.Cryptography;
using System.Text;

namespace RunUpdater.Lib
{
    public class FileHelper
    {
        public enum FilePower
        {
            FullControl = 0,
            ReadOnly = 1,
            Write = 2,
            Modify = 3
        }

        /// <summary>
        /// 计算指定文件MD5
        /// </summary>
        /// <param name="FilePath">文件路径</param>
        /// <returns>返回MD5</returns>
        public static string GetMD5ByMD5CryptoService(string FilePath)
        {
            try
            {
                FileStream fs = new FileStream(FilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
                MD5CryptoServiceProvider md5Provider = new MD5CryptoServiceProvider();
                byte[] buffer = md5Provider.ComputeHash(fs);
                string resule = BitConverter.ToString(buffer);
                resule = resule.Replace("-", "");
                md5Provider.Clear();
                fs.Close();
                return resule;
            }
            catch
            {
                return "";
            }
        }

        /// <summary>  
        ///计算指定大文件MD5
        /// </summary>  
        /// <param name="FilePath">文件地址</param>  
        /// <returns>返回MD5</returns>  
        public static string GetMD5ByHashAlgorithm(string FilePath)
        {
            try
            {
                int bufferSize = 1024 * 16;//自定义缓冲区大小16K  
                byte[] buffer = new byte[bufferSize];
                Stream inputStream = File.Open(FilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
                HashAlgorithm hashAlgorithm = new MD5CryptoServiceProvider();
                int readLength = 0;//每次读取长度  
                var output = new byte[bufferSize];
                while ((readLength = inputStream.Read(buffer, 0, buffer.Length)) > 0)
                {
                    //计算MD5  
                    hashAlgorithm.TransformBlock(buffer, 0, readLength, output, 0);
                }
                //完成最后计算，必须调用(由于上一部循环已经完成所有运算，所以调用此方法时后面的两个参数都为0)  
                hashAlgorithm.TransformFinalBlock(buffer, 0, 0);
                string md5 = BitConverter.ToString(hashAlgorithm.Hash);
                hashAlgorithm.Clear();
                inputStream.Close();
                md5 = md5.Replace("-", "");
                return md5;
            }
            catch
            {
                return "";
            }
        }

        /// <summary>
        /// 字节转换为GB、MB、KB、B
        /// </summary>
        /// <param name="byteSize">待转换字节数值</param>
        /// <returns>返回转换结果GB、MB、KB、B</returns>
        public static string ConvertSize(long byteSize)
        {
            int unit = 1024;

            if (byteSize < unit) return byteSize + " B";

            int exp = (int)(Math.Log(byteSize) / Math.Log(unit));

            return $"{byteSize / Math.Pow(unit, exp):F2}{"KMGTPE"[exp - 1]}B";
        }

        #region 文件操作

        /// <summary>
        /// 删除指定目录下的所有文件及文件夹
        /// </summary>
        /// <param name="strPath">待删除目录</param>
        /// <param name="isReservedDir">是否保留目录</param>
        /// <returns>删除结果</returns>
        public static bool DeleteDir(string strPath, bool isReservedDir = true)
        {
            try
            {
                // 清除空格 
                strPath = @strPath.Trim().ToString();
                // 判断文件夹是否存在 
                if (Directory.Exists(strPath))
                {
                    // 获得文件夹数组 
                    string[] strDirs = Directory.GetDirectories(strPath);
                    // 获得文件数组 
                    string[] strFiles = Directory.GetFiles(strPath);
                    // 遍历所有子文件夹 
                    foreach (string strFile in strFiles)
                    {
                        // 删除文件
                        File.Delete(strFile);
                    }
                    // 遍历所有文件 
                    foreach (string strdir in strDirs)
                    {
                        // 删除文件夹 
                        Directory.Delete(strdir, true);
                    }
                    if (!isReservedDir)
                    {
                        Directory.Delete(strPath);
                    }
                }
                // 成功 
                return true;
            }
            catch (Exception) // 异常处理         
            {
                // 失败 
                return false;
            }
        }

        /// <summary>
        /// 删除指定目录下的指定后缀名的文件
        /// </summary>
        /// <param name="directory">要删除的文件所在的目录，是绝对目录，如d:\temp</param>
        /// <param name="masks">要删除的文件的后缀名的一个数组，比如masks中包含了.cs,.vb,.c这三个元素</param>
        /// <param name="searchSubdirectories">表示是否需要递归删除，即是否也要删除子目录中相应的文件</param>
        /// <param name="ignoreHidden">表示是否忽略隐藏文件</param>
        /// <param name="deletedFileCount">表示总共删除的文件数</param>
        public static bool DeleteFiles(string directory, string[] masks, bool searchSubdirectories, bool ignoreHidden, ref int deletedFileCount)
        {
            try
            {
                //先删除当前目录下指定后缀名的所有文件
                foreach (string file in Directory.GetFiles(directory, "*.*"))
                {
                    if (!(ignoreHidden && (File.GetAttributes(file) & FileAttributes.Hidden) == FileAttributes.Hidden))
                    {
                        foreach (string mask in masks)
                        {
                            if (Path.GetExtension(file) == mask)
                            {
                                File.Delete(file);
                                deletedFileCount++;
                            }
                        }
                    }
                }
                //如果需要对子目录进行处理，则对子目录也进行递归操作
                if (searchSubdirectories)
                {
                    string[] childDirectories = Directory.GetDirectories(directory);
                    foreach (string dir in childDirectories)
                    {
                        if (!(ignoreHidden && (File.GetAttributes(dir) & FileAttributes.Hidden) == FileAttributes.Hidden))
                        {
                            DeleteFiles(dir, masks, searchSubdirectories, ignoreHidden, ref deletedFileCount);
                        }
                    }
                }
            }
            catch (Exception)
            {
                return false;
            }
            return true;
        }

        /// <summary>
        /// 删除指定目录下的指定后缀名的文件
        /// </summary>
        /// <param name="directory">要删除的文件所在的目录，是绝对目录，如d:\temp</param>
        /// <param name="masks">要删除的文件的后缀名的一个数组，比如masks中包含了.cs,.vb,.c这三个元素</param>
        /// <param name="searchSubdirectories">表示是否需要递归删除，即是否也要删除子目录中相应的文件</param>
        /// <param name="ignoreHidden">表示是否忽略隐藏文件</param>
        /// /// <param name="deletedFileCount">表示总共删除的文件数</param>
        public static void DeleteFiles(string directory, string[] masks, bool searchSubdirectories, bool ignoreHidden, int delDay, ref int deletedFileCount)
        {
            //先删除当前目录下指定后缀名的所有文件
            foreach (string file in Directory.GetFiles(directory, "*.*"))
            {
                if (!(ignoreHidden && (File.GetAttributes(file) & FileAttributes.Hidden) == FileAttributes.Hidden))
                {
                    foreach (string mask in masks)
                    {
                        if (Path.GetExtension(file) == mask)
                        {
                            FileInfo _FileInfo = new FileInfo(file);
                            if (_FileInfo.LastWriteTime < DateTime.Now.Date.AddDays(-1 * delDay))
                            {
                                _FileInfo.Delete();
                                deletedFileCount++;
                            }
                        }
                    }
                }
            }
            //如果需要对子目录进行处理，则对子目录也进行递归操作
            if (searchSubdirectories)
            {
                string[] childDirectories = Directory.GetDirectories(directory);
                foreach (string dir in childDirectories)
                {
                    if (!(ignoreHidden && (File.GetAttributes(dir) & FileAttributes.Hidden) == FileAttributes.Hidden))
                    {
                        DeleteFiles(dir, masks, searchSubdirectories, ignoreHidden, delDay, ref deletedFileCount);
                    }
                }
            }
        }

        /// <summary>
        /// 拷贝文件至指定目标目录
        /// </summary>
        /// <param name="sourcePath">源文件目录(@"~\labs\oldlab")</param>
        /// <param name="savePath">保存的目标目录(@"~\labs\newlab")</param>
        /// <returns>返回:true-拷贝成功;false:拷贝失败</returns>
        public static bool CopyOldFilesToNewFiles(string sourcePath, string savePath)
        {
            if (!Directory.Exists(savePath))
            {
                Directory.CreateDirectory(savePath);
            }
            try
            {
                string[] labDirs = Directory.GetDirectories(sourcePath);//目录
                string[] labFiles = Directory.GetFiles(sourcePath);//文件
                if (labFiles.Length > 0)
                {
                    for (int i = 0; i < labFiles.Length; i++)
                    {
                        if (Path.GetFileName(labFiles[i]) != "lpk.dll")//排除.lab文件
                        {
                            if (labFiles[i].EndsWith(".rar", true, null))
                            {
                                File.Copy(sourcePath + "\\" + Path.GetFileName(labFiles[i]), savePath + "\\" +
                                    Path.GetFileName(labFiles[i].Substring(0, labFiles[i].ToLower().LastIndexOf(".rar"))), true);
                            }
                            else
                            {
                                File.Copy(sourcePath + "\\" + Path.GetFileName(labFiles[i]), savePath + "\\" + Path.GetFileName(labFiles[i]), true);
                            }
                        }
                    }
                }
                if (labDirs.Length > 0)
                {
                    for (int j = 0; j < labDirs.Length; j++)
                    {
                        Directory.GetDirectories(sourcePath + "\\" + Path.GetFileName(labDirs[j]));
                        //递归调用
                        CopyOldFilesToNewFiles(sourcePath + "\\" + Path.GetFileName(labDirs[j]), savePath + "\\" + Path.GetFileName(labDirs[j]));
                    }
                }
            }
            catch (Exception)
            {
                return false;
            }
            return true;
        }
        /// <summary>
        /// 拷贝文件至指定目标目录
        /// </summary>
        /// <param name="sourcePath">源文件目录(@"~\labs\oldlab")</param>
        /// <param name="savePath">保存的目标目录(@"~\labs\newlab")</param>
        /// <param name="Extension">保存的目标后缀</param>
        /// <returns>返回:true-拷贝成功;false:拷贝失败</returns>
        public static bool CopyOldFilesToNewFiles(string sourcePath, string savePath, string Extension = "")
        {
            if (!Directory.Exists(savePath))
            {
                Directory.CreateDirectory(savePath);
            }
            try
            {
                string[] labDirs = Directory.GetDirectories(sourcePath);//目录
                string[] labFiles = Directory.GetFiles(sourcePath);//文件
                if (labFiles.Length > 0)
                {
                    for (int i = 0; i < labFiles.Length; i++)
                    {
                        if (Path.GetFileName(labFiles[i]) != "lpk.dll")//排除lpk.dll文件
                        {
                            if (labFiles[i].EndsWith(Extension))
                            {
                                File.Copy(sourcePath + "\\" + Path.GetFileName(labFiles[i]), savePath + "\\" +
                                    Path.GetFileName(labFiles[i]), true);
                            }
                            else
                            {
                                File.Copy(sourcePath + "\\" + Path.GetFileName(labFiles[i]), savePath + "\\" + Path.GetFileName(labFiles[i]) + Extension, true);
                            }
                        }
                    }
                }
                if (labDirs.Length > 0)
                {
                    for (int j = 0; j < labDirs.Length; j++)
                    {
                        Directory.GetDirectories(sourcePath + "\\" + Path.GetFileName(labDirs[j]));
                        //递归调用
                        CopyOldFilesToNewFiles(sourcePath + "\\" + Path.GetFileName(labDirs[j]), savePath + "\\" + Path.GetFileName(labDirs[j]), Extension);
                    }
                }
            }
            catch (Exception)
            {
                return false;
            }
            return true;
        }
        /// <summary>
        /// 返回指定目录下的所有文件信息
        /// </summary>
        /// <param name="strDirectory"></param>
        /// <returns></returns>
        public List<FileInfo> GetAllFilesInDirectory(string strDirectory)
        {
            //判断文件夹是否存在，不存在则退出
            if (!Directory.Exists(strDirectory))
                return null;

            List<FileInfo> listFiles = new List<FileInfo>(); //保存所有的文件信息  
            DirectoryInfo directory = new DirectoryInfo(strDirectory);
            DirectoryInfo[] directoryArray = directory.GetDirectories();
            FileInfo[] fileInfoArray = directory.GetFiles();
            if (fileInfoArray.Length > 0) listFiles.AddRange(fileInfoArray);
            foreach (DirectoryInfo _directoryInfo in directoryArray)
            {
                DirectoryInfo directoryA = new DirectoryInfo(_directoryInfo.FullName);
                DirectoryInfo[] directoryArrayA = directoryA.GetDirectories();
                FileInfo[] fileInfoArrayA = directoryA.GetFiles();
                if (fileInfoArrayA.Length > 0) listFiles.AddRange(fileInfoArrayA);
                GetAllFilesInDirectory(_directoryInfo.FullName);//递归遍历  
            }
            return listFiles;
        }

        /// <summary>
        /// 获取所有目录即子目录下的文件总字节大小
        /// </summary>
        /// <param name="listFileInfo">返回指定目录下的所有文件信息</param>
        /// <returns>返回值</returns>
        private static long GetUpdateSize(List<FileInfo> listFileInfo)
        {
            long len = 0;
            if (listFileInfo != null)
            {
                foreach (FileInfo fileInfo in listFileInfo)
                {
                    if (fileInfo.Name != "lpk.dll")
                    {
                        len += fileInfo.Length;
                    }
                }
            }
            return len;
        }
        #endregion

        /// <summary>
        /// 为创建的临时文件分配权限
        /// </summary>
        /// <param name="pathname"></param>
        /// <param name="username"></param>
        /// <param name="power"></param>
        public static void AddpathPower(string pathname, string username, string power)
        {
            DirectoryInfo dirinfo = new DirectoryInfo(pathname);
            if ((dirinfo.Attributes & FileAttributes.ReadOnly) != 0)
            {
                dirinfo.Attributes = FileAttributes.Normal;
            }
            //取得访问控制列表
            DirectorySecurity dirsecurity = dirinfo.GetAccessControl();
            switch (power)
            {
                case "FullControl":
                    dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.FullControl,
                        InheritanceFlags.ContainerInherit, PropagationFlags.InheritOnly, AccessControlType.Allow));
                    break;
                case "ReadOnly":
                    dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.Read, AccessControlType.Allow));
                    break;
                case "Write":
                    dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.Write, AccessControlType.Allow));
                    break;
                case "Modify":
                    dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.Modify, AccessControlType.Allow));
                    break;
            }
        }
        /// <summary>
        ///为文件夹添加users，everyone用户组的完全控制权限
        /// </summary>
        /// <param name="dirPath"></param>
        public static void AddSecurityControll2Folder(string dirPath)
        {
            //获取文件夹信息
            DirectoryInfo dir = new DirectoryInfo(dirPath);
            //获得该文件夹的所有访问权限
            DirectorySecurity dirSecurity = dir.GetAccessControl(AccessControlSections.All);
            //设定文件ACL继承
            InheritanceFlags inherits = InheritanceFlags.ContainerInherit | InheritanceFlags.ObjectInherit;
            //添加ereryone用户组的访问权限规则 完全控制权限
            FileSystemAccessRule everyoneFileSystemAccessRule = new FileSystemAccessRule("Everyone", FileSystemRights.FullControl, inherits, PropagationFlags.None, AccessControlType.Allow);
            //添加Users用户组的访问权限规则 完全控制权限
            FileSystemAccessRule usersFileSystemAccessRule = new FileSystemAccessRule("Users", FileSystemRights.FullControl, inherits, PropagationFlags.None, AccessControlType.Allow);
            bool isModified = false;
            dirSecurity.ModifyAccessRule(AccessControlModification.Add, everyoneFileSystemAccessRule, out isModified);
            dirSecurity.ModifyAccessRule(AccessControlModification.Add, usersFileSystemAccessRule, out isModified);
            //设置访问权限
            dir.SetAccessControl(dirSecurity);
        }
    }
}