using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Runtime.InteropServices;

namespace demo.ClassHelper.DirectoryOperate
{
    class DirectoryOperate
    {
        /// <summary>
        /// 调用WinApi获取磁盘空闲空间
        /// </summary>
        /// <param name="rootPathName"></param>
        /// <param name="sectorsPerCluster"></param>
        /// <param name="bytesPerSector"></param>
        /// <param name="numberOfFreeClusters"></param>
        /// <param name="totalNumbeOfClusters"></param>
        /// <returns></returns>
        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
        public static extern bool GetDiskFreeSpace([MarshalAs(UnmanagedType.LPTStr)]string rootPathName,
            ref int sectorsPerCluster, ref int bytesPerSector, ref int numberOfFreeClusters, ref int totalNumbeOfClusters);

        /// <summary>
        /// 获取指定路径的大小
        /// </summary>
        /// <param name="dirPath">路径</param>
        /// <returns></returns>
        public static long GetDirectoryLength(string dirPath)
        {
            long len = 0;
            //判断该路径是否存在（是否为文件夹）
            if (!Directory.Exists(dirPath))
            {
                //查询文件的大小
                len = FileSize(dirPath);
            }
            else
            {
                //定义一个DirectoryInfo对象
                DirectoryInfo di = new DirectoryInfo(dirPath);
                //通过GetFiles方法，获取di目录中的所有文件的大小
                foreach (FileInfo fi in di.GetFiles())
                {
                    len += fi.Length;
                }
                //获取di中所有的文件夹，并存到一个新的对象数组中，以进行递归
                DirectoryInfo[] dis = di.GetDirectories();
                if (dis.Length > 0)
                {
                    for (int i = 0; i < dis.Length; i++)
                    {
                        len += GetDirectoryLength(dis[i].FullName);
                    }
                }
            }
            return len;
        }

        /// <summary>
        /// 删除文件夹
        /// </summary>
        /// <param name="srcPath"></param>
        public static void DelectDir(string srcPath)
        {
            try
            {
                DirectoryInfo dir = new DirectoryInfo(srcPath);
                FileSystemInfo[] fileinfo = dir.GetFileSystemInfos();  //返回目录中所有文件和子目录
                foreach (FileSystemInfo i in fileinfo)
                {
                    if (i is DirectoryInfo)            //判断是否文件夹
                    {
                        DirectoryInfo subdir = new DirectoryInfo(i.FullName);
                        subdir.Delete(true);          //删除子目录和文件
                    }
                    else
                    {
                        File.Delete(i.FullName);      //删除指定文件
                    }
                }
            }
            catch
            {

            }
        }

        public static void DeleteAppointedDir(string path, double day)
        {
            try
            {
                var file = Directory.GetDirectories(path).Select(d => new DirectoryInfo(d))
                    .Where(d => d.CreationTime < DateTime.Now.AddDays(-day) &&
                    d.GetFiles().Length > 0);
                foreach (var s in file)
                {
                    s.Delete();
                }
            }
            catch
            { }
        }

        public static void DeleteAppointedFile(string path, double day)
        {
            DirectoryInfo dyInfo = new DirectoryInfo(path);
            //获取文件夹下所有的文件
            foreach (FileInfo feInfo in dyInfo.GetFiles())
            {
                //判断文件日期是否小于今天，是则删除
                if (feInfo.CreationTime < DateTime.Now.AddDays(-day))
                    feInfo.Delete();
            }
        }

        /// <summary>
        /// 获取指定路径的占用空间
        /// </summary>
        /// <param name="dirPath">路径</param>
        /// <returns></returns>
        public static long GetDirectorySpace(string dirPath)
        {
            //返回值
            long len = 0;
            //判断该路径是否存在（是否为文件夹）
            if (!Directory.Exists(dirPath))
            {
                //如果是文件，则调用
                len = FileSpace(dirPath);
            }
            else
            {
                //定义一个DirectoryInfo对象
                DirectoryInfo di = new DirectoryInfo(dirPath);
                //本机的簇值
                long clusterSize = GetClusterSize(di);
                //遍历目录下的文件，获取总占用空间
                foreach (FileInfo fi in di.GetFiles())
                {
                    //文件大小除以簇，余若不为0
                    if (fi.Length % clusterSize != 0)
                    {
                        decimal res = fi.Length / clusterSize;
                        //文件大小除以簇，取整数加1。为该文件占用簇的值
                        int clu = Convert.ToInt32(Math.Ceiling(res)) + 1;
                        long result = clusterSize * clu;
                        len += result;
                    }
                    else
                    {
                        //余若为0，则占用空间等于文件大小
                        len += fi.Length;
                    }
                }
                //获取di中所有的文件夹，并存到一个新的对象数组中，以进行递归
                DirectoryInfo[] dis = di.GetDirectories();
                if (dis.Length > 0)
                {
                    for (int i = 0; i < dis.Length; i++)
                    {
                        len += GetDirectorySpace(dis[i].FullName);
                    }
                }
            }
            return len;
        }

        //所给路径中所对应的文件大小
        public static long FileSize(string filePath)
        {
            //定义一个FileInfo对象，是指与filePath所指向的文件相关联，以获取其大小
            FileInfo fileInfo = new FileInfo(filePath);
            return fileInfo.Length;
        }

        //所给路径中所对应的文件占用空间
        public static long FileSpace(string filePath)
        {
            long temp = 0;
            //定义一个FileInfo对象，是指与filePath所指向的文件相关联，以获取其大小
            FileInfo fileInfo = new FileInfo(filePath);
            long clusterSize = GetClusterSize(fileInfo);
            if (fileInfo.Length % clusterSize != 0)
            {
                decimal res = fileInfo.Length / clusterSize;
                int clu = Convert.ToInt32(Math.Ceiling(res)) + 1;
                temp = clusterSize * clu;
            }
            else
            {
                return fileInfo.Length;
            }
            return temp;
        }

        public static DiskInfo GetDiskInfo(string rootPathName)
        {
            DiskInfo diskInfo = new DiskInfo();
            int sectorsPerCluster = 0, bytesPerSector = 0, numberOfFreeClusters = 0, totalNumberOfClusters = 0;
            GetDiskFreeSpace(rootPathName, ref sectorsPerCluster, ref bytesPerSector, ref numberOfFreeClusters, ref totalNumberOfClusters);
            //每簇的扇区数
            diskInfo.SectorsPerCluster = sectorsPerCluster;
            //每扇区字节
            diskInfo.BytesPerSector = bytesPerSector;
            return diskInfo;
        }

        //// <summary>
        /// 结构。硬盘信息
        /// </summary>
        public struct DiskInfo
        {
            // public string RootPathName;
            //每簇的扇区数
            public int SectorsPerCluster;
            //每扇区字节
            public int BytesPerSector;
            //public int NumberOfFreeClusters;
            //public int TotalNumberOfClusters;
        }

        /// <summary>
        /// 获取每簇的字节
        /// </summary>
        /// <param name="file">指定文件</param>
        /// <returns></returns>
        public static long GetClusterSize(FileInfo file)
        {
            long clusterSize = 0;
            DiskInfo diskInfo = new DiskInfo();
            diskInfo = GetDiskInfo(file.Directory.Root.FullName);
            clusterSize = (diskInfo.BytesPerSector * diskInfo.SectorsPerCluster);
            return clusterSize;
        }

        /// <summary>
        /// 获取每簇的字节
        /// </summary>
        /// <param name="dir">指定目录</param>
        /// <returns></returns>
        public static long GetClusterSize(DirectoryInfo dir)
        {
            long clusterSize = 0;
            DiskInfo diskInfo = new DiskInfo();
            diskInfo = GetDiskInfo(dir.Root.FullName);
            clusterSize = (diskInfo.BytesPerSector * diskInfo.SectorsPerCluster);
            return clusterSize;
        }

        public static bool GetFiles(string dirPath, string patten, ref List<string> fileList)
        {
            if (!Directory.Exists(dirPath) || patten == string.Empty)
            {
                return false;
            }
            try
            {
                DirectoryInfo dirInfo = new DirectoryInfo(dirPath);
                foreach (FileInfo info in dirInfo.GetFiles())
                {
                    fileList.Add(info.Name.Split('.')[0]);
                }
                return true;
            }
            catch (System.Exception ex)
            {
                string str = ex.ToString();
                return false;
            }
        }
    }
}