using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.IO;
using System.Web.UI;
using System.Web.Mvc;
using Bowin.Common;
using Ionic.Zip;
using Bowin.Common.Log;

namespace EMIS.Utility
{
    public class FileUploadHelper
    {
        public class RemoteFileInfo
        {
            public string FileName { get; set; }
            public string RemotePath { get; set; }
        }

        public static string GetFileUploadSessionName(Guid formID)
        {
            return Const.UPLOAD_SESSION_NAME + "_" + formID.ToString();
        }

        private const long BUFFER_SIZE = 4096;

        /// <summary>
        /// savePath是相对与web上传路径的子路径，如：web上传路径为~/Content/DownFile，savePath为SOC/2018-201901，则实际上传的路径为~/Content/DownFile/SOC/2018-201901
        /// </summary>
        /// <param name="fileList"></param>
        /// <param name="savePath"></param>
        /// <returns></returns>
        public static List<string> UploadFile(HttpFileCollectionBase fileList, string savePath = null)
        {
            UrlHelper urlHelper = new UrlHelper(HttpContext.Current.Request.RequestContext);
            List<string> result = new List<string>();
            string filePath = Const.LOCAL_SETTING_UPLOAD_FILEPATH;
            string physicalPath = HttpContext.Current.Server.MapPath(filePath);
            string dayFolderName = DateTime.Today.ToString("yyyy-MM");
            string tagetPhysicalPath = (physicalPath.EndsWith("\\") ? physicalPath : physicalPath + "\\") + dayFolderName + "\\";

            if (!string.IsNullOrEmpty(savePath))
            {
                filePath += "/" + savePath;
                physicalPath = HttpContext.Current.Server.MapPath(filePath);
                tagetPhysicalPath = (physicalPath.EndsWith("\\") ? physicalPath : physicalPath + "\\");
            }
            else
            {
                filePath += "/" + dayFolderName;
            }

            if (!Directory.Exists(tagetPhysicalPath))
            {
                Directory.CreateDirectory(tagetPhysicalPath);
            }
            foreach (HttpPostedFile file in fileList)
            {
                var newFileName = Guid.NewGuid().ToString() + "." + Path.GetExtension(file.FileName);
                var webFileName = filePath + "/" + newFileName;
                var physicalFileName = tagetPhysicalPath + newFileName;
                file.SaveAs(physicalFileName);

                result.Add(urlHelper.Content(webFileName));
            }

            return result;
        }

        /// <summary>
        /// savePath是相对与web上传路径的子路径，如：web上传路径为~/Content/DownFile，savePath为SOC/2018-201901，则实际上传的路径为~/Content/DownFile/SOC/2018-201901
        /// </summary>
        /// <param name="file"></param>
        /// <param name="savePath"></param>
        /// <returns></returns>
        public static string UploadFile(HttpPostedFileBase file, string savePath = null)
        {
            if (file == null || string.IsNullOrEmpty(file.FileName)) return null;
            UrlHelper urlHelper = new UrlHelper(HttpContext.Current.Request.RequestContext);
            string filePath = Const.LOCAL_SETTING_UPLOAD_FILEPATH;
            string dayFolderName = DateTime.Today.ToString("yyyy-MM");
            var physicalFileName = UploadFileInternal(file, savePath);

            if (!string.IsNullOrEmpty(savePath))
            {
                filePath += "/" + savePath;
            }
            else
            {
                filePath += "/" + dayFolderName;
            }
            var webFileName = filePath + "/" + Path.GetFileName(physicalFileName);

            return urlHelper.Content(webFileName);
        }
        public static string UploadFile(MemoryStream file, string extName, string savePath = null)
        {
            if (file == null || file.Length == 0) return null;
            UrlHelper urlHelper = new UrlHelper(HttpContext.Current.Request.RequestContext);
            string filePath = Const.LOCAL_SETTING_UPLOAD_FILEPATH;
            string dayFolderName = DateTime.Today.ToString("yyyy-MM");
            var physicalFileName = UploadFileInternal(file, extName, savePath);

            if (!string.IsNullOrEmpty(savePath))
            {
                filePath += "/" + savePath;
            }
            else
            {
                filePath += "/" + dayFolderName;
            }
            var webFileName = filePath + "/" + Path.GetFileName(physicalFileName);

            return urlHelper.Content(webFileName);
        }

        public static void DeleteFile(string filePath)
        {
            DeleteFileInternal(filePath);
        }

        /// <summary>
        /// savePath是相对与web上传路径的子路径，如：web上传路径为~/Content/DownFile，savePath为SOC/2018-201901，则实际上传的路径为~/Content/DownFile/SOC/2018-201901
        /// </summary>
        /// <param name="file"></param>
        /// <param name="savePath"></param>
        /// <returns></returns>
        public static IList<string> UploadFileAndExtractFile(HttpPostedFileBase file, string savePath = null)
        {
            var physicalFileName = UploadFileInternal(file, savePath);

            if (physicalFileName == null) return new List<string>();

            var targetPhysicalFileName = physicalFileName.Replace(Path.GetExtension(physicalFileName), "");
            var result = ZIPHelper.SevenZip_ExtractStream(physicalFileName, targetPhysicalFileName);
            //var filePath = Const.LOCAL_SETTING_UPLOAD_FILEPATH;
            UrlHelper urlHelper = new UrlHelper(HttpContext.Current.Request.RequestContext);

            result = result.Select(s => urlHelper.Content("~/" + s.Replace(HttpContext.Current.Server.MapPath("~/"), "").Replace("\\", "//"))).ToList();

            return result;
        }

        /// <summary>
        /// savePath是相对与web上传路径的子路径，如：web上传路径为~/Content/DownFile，savePath为SOC/2018-201901，则实际上传的路径为~/Content/DownFile/SOC/2018-201901
        /// </summary>
        /// <param name="file"></param>
        /// <param name="savePath"></param>
        /// <returns></returns>
        public static string UploadFileInternal(HttpPostedFileBase file, string savePath = null)
        {
            LogHelper.WriteLog(LogType.ServiceLog, "----进入UploadFileInternal方法-----");
            if (file == null || string.IsNullOrEmpty(file.FileName)) return null;

            UrlHelper urlHelper = new UrlHelper(HttpContext.Current.Request.RequestContext);
            string filePath = Const.LOCAL_SETTING_UPLOAD_FILEPATH;
            string physicalPath = HttpContext.Current.Server.MapPath(filePath);
            string dayFolderName = DateTime.Today.ToString("yyyy-MM");
            string tagetPhysicalPath = (physicalPath.EndsWith("\\") ? physicalPath : physicalPath + "\\") + dayFolderName + "\\";

            if (!string.IsNullOrEmpty(savePath))
            {
                filePath += "/" + savePath;
                physicalPath = HttpContext.Current.Server.MapPath(filePath);
                tagetPhysicalPath = (physicalPath.EndsWith("\\") ? physicalPath : physicalPath + "\\");
            }

            if (!Directory.Exists(tagetPhysicalPath))
            {
                Directory.CreateDirectory(tagetPhysicalPath);
            }
            var newFileName = Guid.NewGuid().ToString() + Path.GetExtension(file.FileName);
            var physicalFileName = tagetPhysicalPath + newFileName;
            file.SaveAs(physicalFileName);

            return physicalFileName;
        }
        public static string UploadFileInternal(MemoryStream file, string extName, string savePath = null)
        {
            if (file == null || file.Length == 0) return null;

            UrlHelper urlHelper = new UrlHelper(HttpContext.Current.Request.RequestContext);
            string filePath = Const.LOCAL_SETTING_UPLOAD_FILEPATH;
            string physicalPath = HttpContext.Current.Server.MapPath(filePath);
            string dayFolderName = DateTime.Today.ToString("yyyy-MM");
            string tagetPhysicalPath = (physicalPath.EndsWith("\\") ? physicalPath : physicalPath + "\\") + dayFolderName + "\\";

            if (!string.IsNullOrEmpty(savePath))
            {
                filePath += "/" + savePath;
                physicalPath = HttpContext.Current.Server.MapPath(filePath);
                tagetPhysicalPath = (physicalPath.EndsWith("\\") ? physicalPath : physicalPath + "\\");
            }

            if (!Directory.Exists(tagetPhysicalPath))
            {
                Directory.CreateDirectory(tagetPhysicalPath);
            }
            var newFileName = Guid.NewGuid().ToString() + extName;
            var physicalFileName = tagetPhysicalPath + newFileName;
            FileStream fs = File.Create(physicalFileName);
            var fileData = file.GetBuffer();
            fs.Write(fileData, 0, fileData.Length);
            fs.Flush();
            fs.Close();

            return physicalFileName;
        }

        public static void DeleteFileInternal(string filePath)
        {
            string fullPath = HttpContext.Current.Server.MapPath("~" + filePath);
            File.Delete(fullPath);
        }

        /// <summary>
        /// 批量下载文件并打包
        /// </summary>
        /// <param name="packageName">打包文件的文件名</param>
        /// <param name="fileNames">下载的临时文件的虚拟路径数组</param>
        /// <param name="remotePaths">远程文件地址数组</param>
        /// <remarks>fileNames和remotePaths的长度必须一致，并且同一索引的fileNames元素和remotePaths元素对应</remarks>
        /// <example>
        ///     fileInfos[0].FileName = "文件1.txt";
        ///		fileInfos[0].RemotePath = "http://www.google.com/html1.txt";
        ///		fileInfos[1].FileName = "文件2.txt";
        ///		fileInfos[1].RemotePath = "http://www.google.com/html2.txt";
        ///		fileInfos[2].FileName = "文件3.txt";
        ///		fileInfos[2].RemotePath = "http://www.google.com/html3.txt";
        ///		
        ///		packagePath = "c:\aa.rar";
        ///		
        ///		执行结果：将http://www.google.com/html1.txt下载并保存为文件1.txt，
        ///					http://www.google.com/html2.txt下载并保存为文件2.txt，
        ///					http://www.google.com/html3.txt下载并保存为文件3.txt
        ///				  然后将这三个文件打成压缩包，保存在c:\aa.rar中
        /// </example>
        public static Stream DownLoadFiles(string packageName, string downloadName, IList<RemoteFileInfo> fileInfos)
        {
            string rarTmpPathName = "RarTmp" + Guid.NewGuid().ToString();

            if (fileInfos.Count == 0)
            {
                throw new Exception("导出相片失败，找不到相片");
                //return; 
            }

            #region 下载文件
            string physicalPath = HttpContext.Current.Server.MapPath(Const.LOCAL_SETTING_UPLOAD_FILEPATH + "/" + rarTmpPathName);
            Directory.CreateDirectory(HttpContext.Current.Server.MapPath(Const.LOCAL_SETTING_UPLOAD_FILEPATH + "/" + rarTmpPathName));
            //去重复
            var fileInfosDistinct = fileInfos.GroupBy(x => new { x.FileName, x.RemotePath }).Select(w => new { w.Key.FileName, w.Key.RemotePath }).ToList();
            var downloadedFileInfo = fileInfosDistinct.Take(0).ToList();
            foreach (var fileInfo in fileInfosDistinct)
            {
                try
                {
                    var localfilePath = Path.GetDirectoryName(
                        HttpContext.Current.Server.MapPath(Const.LOCAL_SETTING_UPLOAD_FILEPATH + "/" + rarTmpPathName + "/" + fileInfo.FileName)
                        );

                    if (!Directory.Exists(localfilePath))
                    {
                        Directory.CreateDirectory(localfilePath);
                    }

                    FileManager.DownloadFile(Const.LOCAL_SETTING_UPLOAD_FILEPATH + "/" + rarTmpPathName + "/" + fileInfo.FileName, fileInfo.RemotePath);
                    downloadedFileInfo.Add(fileInfo);
                }
                catch (Exception ex)
                {
                    string e = ex.ToString();
                    continue;
                }
            }
            if (downloadedFileInfo.Count == 0)
            {
                throw new Exception("所有的下载文件都不存在，无法下载。");
            }
            #endregion
            System.Web.HttpServerUtility server = System.Web.HttpContext.Current.Server;
            #region 打包
            string packageFullPath = HttpContext.Current.Server.MapPath(Const.LOCAL_SETTING_UPLOAD_FILEPATH + "/" + packageName);
            string tmpFilePath = HttpContext.Current.Server.MapPath(Const.LOCAL_SETTING_UPLOAD_FILEPATH + "/" + rarTmpPathName);

            using (ZipFile zipNew = new ZipFile())
            {
                zipNew.AlternateEncoding = Encoding.UTF8;
                zipNew.AlternateEncodingUsage = ZipOption.AsNecessary;

                //去重复，压缩时若有重复文件会报“已添加了具有相同键的项”错误
                foreach (var fileInfo in downloadedFileInfo)
                {
                    string UrlList = tmpFilePath + @"\" + fileInfo.FileName;

                    zipNew.AddFile(UrlList, @"\" + Path.GetDirectoryName(fileInfo.FileName));
                }
                zipNew.Save(packageFullPath + ".zip");
            }

            Directory.Delete(HttpContext.Current.Server.MapPath(Const.LOCAL_SETTING_UPLOAD_FILEPATH + "/" + rarTmpPathName), true);
            #endregion

            #region 弹出下载窗口
            System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;


            response.Clear();
            response.WriteFile(HttpContext.Current.Server.MapPath(Const.LOCAL_SETTING_UPLOAD_FILEPATH + "/" + packageName + ".zip"));
            string httpHeader = "attachment;filename=" + server.UrlEncode(downloadName) + ".zip";
            response.AppendHeader("Content-Disposition", httpHeader);
            response.Flush();
            System.IO.File.Delete(HttpContext.Current.Server.MapPath(Const.LOCAL_SETTING_UPLOAD_FILEPATH + "/" + packageName + ".zip"));//删除临时文件
            //response.End();

            return response.OutputStream;
            #endregion
        }
    }
}