using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Http;
using System.Text;
using System.Web;


namespace Epost.Common
{
    #region 文件
    /// <summary>
    /// 文件
    /// </summary>
    public static class FileHelper
    {
        /// <summary>  
        ///     编码方式  
        /// </summary>  
        private static readonly Encoding Encoding = Encoding.UTF8;

        #region 获取文件后缀名
        /// <summary>
        /// 获取文件后缀名
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="isPoint"></param>
        /// <returns></returns>
        public static string GetFileExt(string filePath, bool isPoint = false)
        {
            if (string.IsNullOrEmpty(filePath))
            {
                return string.Empty;
            }
            if (filePath.LastIndexOf(".", StringComparison.Ordinal) > 0)
            {
                if (isPoint)
                {
                    return filePath.Substring(filePath.LastIndexOf(".", StringComparison.Ordinal)); //文件扩展名，含“.”
                }
                else
                {
                    return filePath.Substring(filePath.LastIndexOf(".", StringComparison.Ordinal) + 1); //文件扩展名，不含“.”
                }
            }
            return string.Empty;
        }
        #endregion

        #region 获取文件名

        /// <summary>
        /// 获取文件名
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="isExt"></param>
        /// <returns></returns>
        public static string GetFileName(string filePath, bool isExt = true)
        {
            if (string.IsNullOrEmpty(filePath))
            {
                return string.Empty;
            }
            var fileName = filePath.Substring(filePath.LastIndexOf(@"\", StringComparison.Ordinal) + 1);
            if (isExt)
            {
                return fileName;
            }
            fileName = fileName.Substring(0, fileName.LastIndexOf(".", StringComparison.Ordinal));
            return fileName;
        }
        #endregion

        #region 获得当前绝对路径
        /// <summary>
        /// 获得当前绝对路径
        /// </summary>
        /// <param name="strPath">指定的路径</param>
        /// <returns>绝对路径</returns>
        public static string GeAbsolutePath(string strPath)
        {
            if (strPath.ToLower().StartsWith("http://"))
            {
                return strPath;
            }
            if (HttpContext.Current != null)
            {
                return HttpContext.Current.Server.MapPath(strPath);
            }
            else //非web程序引用
            {
                strPath = strPath.Replace("/", "\\");
                if (strPath.StartsWith("\\"))
                {
                    strPath = strPath.Substring(strPath.IndexOf('\\', 1)).TrimStart('\\');
                }
                return Path.Combine(AppDomain.CurrentDomain.BaseDirectory, strPath);
            }
        }
        #endregion

        #region 获得当前虚拟路径
        /// <summary>
        /// 获得当前虚拟路径
        /// </summary>
        /// <param name="strPath">指定的路径</param>
        /// <returns>绝对路径</returns>
        public static string GeVirtualPath(string strPath)
        {
            if (strPath.ToLower().StartsWith("http://"))
            {
                return strPath;
            }
            if (HttpContext.Current != null)
            {
                return HttpContext.Current.Request.ApplicationPath + strPath;
            }
            else //非web程序引用
            {
                strPath = strPath.Replace("/", "\\");
                if (strPath.StartsWith("\\"))
                {
                    strPath = strPath.Substring(strPath.IndexOf('\\', 1)).TrimStart('\\');
                }
                return Path.Combine(AppDomain.CurrentDomain.BaseDirectory, strPath);
            }
        }
        #endregion

        #region 创建文件夹
        /// <summary>
        /// 创建文件夹
        /// </summary>
        /// <param name="path">文件夹路径</param>
        /// <returns>返回传来的路径</returns>
        public static bool CreateFile(string path)
        {
            if (!Directory.Exists(path))    //检查文件是否存在
            {
                Directory.CreateDirectory(path);  //创建文件
            }
            return Directory.Exists(path);
        }
        #endregion

        #region 判断文件是否存在
        /// <summary>
        /// 判断文件是否存在
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static bool FileExists(string path)
        {
            return File.Exists(GeAbsolutePath(path));

        }
        #endregion

        #region 复制文件夹

        /// <summary>
        /// 复制文件夹
        /// </summary>
        /// <param name="sourceDir"></param>
        /// <param name="targetDir"></param>
        /// <param name="notInclude"></param>
        /// <returns></returns>
        public static bool CopyDirectory(string sourceDir, string targetDir, List<string> notInclude = null)
        {
            try
            {
                if (!Directory.Exists(sourceDir))
                {
                    return false;
                }
                if (!Directory.Exists(targetDir))    //检查文件是否存在
                {
                    Directory.CreateDirectory(targetDir);  //创建文件
                    File.SetAttributes(targetDir, File.GetAttributes(sourceDir));
                }
                if (targetDir[targetDir.Length - 1] != Path.DirectorySeparatorChar)
                    targetDir = targetDir + Path.DirectorySeparatorChar;

                string[] files = Directory.GetFiles(sourceDir);
                foreach (string file in files)
                {
                    if (notInclude != null && notInclude.Contains(file.ToLower()))
                    {
                        continue;
                    }
                    File.Copy(file, targetDir + Path.GetFileName(file), true);
                    File.SetAttributes(targetDir + Path.GetFileName(file), FileAttributes.Normal);
                }

                string[] dirs = Directory.GetDirectories(sourceDir);
                foreach (string dir in dirs)
                {
                    if (notInclude != null && notInclude.Contains(dir.ToLower()))
                    {
                        continue;
                    }
                    if (!CopyDirectory(dir, targetDir + Path.GetFileName(dir), notInclude))
                    {
                        return false;
                    }
                }
                return true;
            }
            catch (Exception ex)
            {
                // new LogHelper(typeof(FileHelper)).Error(ex);
                return false;
            }
        }
        #endregion

        #region 写入文件
        /// <summary>  
        /// 写入文件  
        /// </summary>  
        /// <param name="filePath">文件名</param>  
        /// <param name="content">文件内容</param>  
        public static bool WriteFile(string filePath, string content)
        {
            try
            {
                var fs = new FileStream(filePath, FileMode.Create);
                Encoding encode = Encoding;
                //获得字节数组  
                byte[] data = encode.GetBytes(content);
                //开始写入  
                fs.Write(data, 0, data.Length);
                //清空缓冲区、关闭流  
                fs.Flush();
                fs.Close();
                return true;
            }
            catch (Exception ex)
            {
                //    new LogHelper(typeof(FileHelper)).Error(ex);
                return false;
            }
        }
        #endregion

        #region 读取文件
        /// <summary>  
        /// 读取文件  
        /// </summary>  
        /// <param name="filePath"></param>  
        /// <returns></returns>  
        public static string ReadFile(string filePath)
        {
            return ReadFile(filePath, Encoding);
        }

        /// <summary>  
        /// 读取文件  
        /// </summary>  
        /// <param name="filePath"></param>  
        /// <param name="encoding"></param>  
        /// <returns></returns>  
        public static string ReadFile(string filePath, Encoding encoding)
        {
            try
            {
                using (var sr = new StreamReader(filePath, encoding))
                {
                    return sr.ReadToEnd();
                }
            }
            catch (Exception ex)
            {
                // new LogHelper(typeof(FileHelper)).Error(ex);
                return string.Empty;
            }
        }
        #endregion
    }
    #endregion
}