using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System;
using System.IO;
using System.Net;
using DicomTool.Model;

namespace DicomTool
{
   public static class FtpHelper
    {

        public static void DownloadFtpFile(List<ReportEcg> ftpUriList, string username, string password, string localFilePath)
        {
            // 确保本地文件路径是目录
            if (!Directory.Exists(localFilePath))
            {
                Directory.CreateDirectory(localFilePath);
            }

            foreach (var reportEcg in ftpUriList)
            {
                // 创建 FtpWebRequest 对象
                var request = (FtpWebRequest)WebRequest.Create(reportEcg.ReportUrl);
                request.Method = WebRequestMethods.Ftp.DownloadFile;
                request.Credentials = new NetworkCredential(username, password);

                try
                {
                    // 获取响应并读取数据
                    var response = (FtpWebResponse)request.GetResponse();
                    var responseStream = response.GetResponseStream();

                    // 获取文件名
                    // string fileName = Path.GetFileName(new Uri(reportEcg.ReportUrl).LocalPath);
                    var fileName = reportEcg.ID + ".jpg";
                    Console.WriteLine("【下载】"+ reportEcg.ID + ".jpg");
                    var localFileFullPath = Path.Combine(localFilePath, fileName);

                    // 将 FTP 文件内容写入本地文件
                    using (FileStream fileStream = new FileStream(localFileFullPath, FileMode.Create, FileAccess.Write))
                    {
                        byte[] buffer = new byte[4096];
                        int bytesRead;
                        while ((bytesRead = responseStream.Read(buffer, 0, buffer.Length)) != 0)
                        {
                            fileStream.Write(buffer, 0, bytesRead);
                        }
                    }

                    responseStream.Close();
                    response.Close();
                }
                catch (WebException ex)
                {
                    // 处理异常，例如打印错误信息
                    Console.WriteLine("Download failed for " + reportEcg + ": " + ex.Message);
                }
            }
        }
    }
}