using System;
using System.IO;
using System.Net;
using System.Web;
using System.Web.UI.WebControls;

namespace CallCenter.Utility
{
    /// <summary>
    /// 文件上传类
    /// </summary>
    public class FileUp
    {
        public FileUp()
        { }

        /// <summary>
        /// 转换为字节数组
        /// </summary>
        /// <param name="filename">文件名</param>
        /// <returns>字节数组</returns>
        public byte[] GetBinaryFile(string filename)
        {
            if (File.Exists(filename))
            {
                FileStream Fsm = null;
                try
                {
                    Fsm = File.OpenRead(filename);
                    return this.ConvertStreamToByteBuffer(Fsm);
                }
                catch
                {
                    return new byte[0];
                }
                finally
                {
                    Fsm.Close();
                }
            }
            else
            {
                return new byte[0];
            }
        }

        /// <summary>
        /// 流转化为字节数组
        /// </summary>
        /// <param name="theStream">流</param>
        /// <returns>字节数组</returns>
        public byte[] ConvertStreamToByteBuffer(System.IO.Stream theStream)
        {
            int bi;
            MemoryStream tempStream = new System.IO.MemoryStream();
            try
            {
                while ((bi = theStream.ReadByte()) != -1)
                {
                    tempStream.WriteByte(((byte)bi));
                }
                return tempStream.ToArray();
            }
            catch
            {
                return new byte[0];
            }
            finally
            {
                tempStream.Close();
            }
        }

        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="PosPhotoUpload">控件</param>
        /// <param name="saveFileName">保存的文件名</param>
        /// <param name="imagePath">保存的文件路径</param>
        public string FileSc(FileUpload PosPhotoUpload, string saveFileName, string imagePath)
        {
            string state = "";
            if (PosPhotoUpload.HasFile)
            {
                if (PosPhotoUpload.PostedFile.ContentLength / 1024 < 10240)
                {
                    string MimeType = PosPhotoUpload.PostedFile.ContentType;
                    if (String.Equals(MimeType, "image/gif") || String.Equals(MimeType, "image/pjpeg"))
                    {
                        string extFileString = System.IO.Path.GetExtension(PosPhotoUpload.PostedFile.FileName);
                        PosPhotoUpload.PostedFile.SaveAs(HttpContext.Current.Server.MapPath(imagePath));
                    }
                    else
                    {
                        state = "上传文件类型不正确";
                    }
                }
                else
                {
                    state = "上传文件不能大于10M";
                }
            }
            else
            {
                state = "没有上传文件";
            }
            return state;
        }

        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="binData">字节数组</param>
        /// <param name="fileName">文件名</param>
        /// <param name="fileType">文件类型</param>
        //-------------------调用----------------------
        //byte[] by = GetBinaryFile("E:\\Hello.txt");
        //this.SaveFile(by,"Hello",".txt");
        //---------------------------------------------
        public void SaveFile(byte[] binData, string SavePath, string fileName, string fileType)
        {
            FileStream fileStream = null;
            MemoryStream m = new MemoryStream(binData);
            try
            {
                string savePath = HttpContext.Current.Server.MapPath(SavePath);
                if (!Directory.Exists(savePath))
                {
                    Directory.CreateDirectory(savePath);
                }
                string File = savePath + fileName + fileType;
                fileStream = new FileStream(File, FileMode.Create);
                m.WriteTo(fileStream);
            }
            finally
            {
                m.Close();
                fileStream.Close();
            }
        }


        /// <summary>
        /// FTP上传文件
        /// </summary>
        /// <param name="fileinfo">需要上传的文件</param>
        /// <param name="targetDir">目标路径</param>
        /// <param name="hostname">ftp地址</param>
        /// <param name="username">ftp用户名</param>
        /// <param name="password">ftp密码</param>
        public static string UploadFile(FileInfo fileinfo, string targetDir, string hostname, string username, string password)
        {
            //1. check target
            string target;
            if (targetDir.Trim() == "")
            {
                return "";
            }
            target = Guid.NewGuid().ToString();  //使用临时文件名


            string URI = "FTP://" + hostname + "/" + targetDir + "/" + target;
            ///WebClient webcl = new WebClient();
            System.Net.FtpWebRequest ftp = GetRequest(URI, username, password);

            //设置FTP命令 设置所要执行的FTP命令，
            //ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectoryDetails;//假设此处为显示指定路径下的文件列表
            ftp.Method = System.Net.WebRequestMethods.Ftp.UploadFile;
            //指定文件传输的数据类型
            ftp.UseBinary = true;
            ftp.UsePassive = true;

            //告诉ftp文件大小
            ftp.ContentLength = fileinfo.Length;
            //缓冲大小设置为2KB
            const int BufferSize = 204800;
            byte[] content = new byte[BufferSize - 1 + 1];
            int dataRead;

            //打开一个文件流 (System.IO.FileStream) 去读上传的文件
            using (FileStream fs = fileinfo.OpenRead())
            {
                try
                {
                    //把上传的文件写入流
                    using (Stream rs = ftp.GetRequestStream())
                    {
                        do
                        {
                            //每次读文件流的2KB
                            dataRead = fs.Read(content, 0, BufferSize);
                            rs.Write(content, 0, dataRead);
                        } while (!(dataRead < BufferSize));
                        rs.Close();
                    }

                }
                catch (Exception ex) { }
                finally
                {
                    fs.Close();
                }

            }

            ftp = null;
            //设置FTP命令
            ftp = GetRequest(URI, username, password);
            ftp.Method = System.Net.WebRequestMethods.Ftp.Rename; //改名
            ftp.RenameTo = fileinfo.Name;
            try
            {
                ftp.GetResponse();
                return fileinfo.Name;
            }
            catch (Exception ex)
            {
                ftp = GetRequest(URI, username, password);
                ftp.Method = System.Net.WebRequestMethods.Ftp.DeleteFile; //删除
                ftp.GetResponse();
                throw ex;
            }
            finally
            {
                //fileinfo.Delete();
            }

            // 可以记录一个日志  "上传" + fileinfo.FullName + "上传到" + "FTP://" + hostname + "/" + targetDir + "/" + fileinfo.Name + "成功." );
            ftp = null;

            #region
            /*****
             *FtpWebResponse
             * ****/
            //FtpWebResponse ftpWebResponse = (FtpWebResponse)ftp.GetResponse();
            #endregion 
        }


        private static FtpWebRequest GetRequest(string URI, string username, string password)
        {
            //根据服务器信息FtpWebRequest创建类的对象
            FtpWebRequest result = (FtpWebRequest)FtpWebRequest.Create(URI);
            //提供身份验证信息
            result.Credentials = new System.Net.NetworkCredential(username, password);
            //设置请求完成之后是否保持到FTP服务器的控制连接，默认值为true
            result.KeepAlive = false;
            return result;
        }
    }
}