using System.Net;

namespace DcmToPng.Helper
{
    public static class DownloadHelper
    {  
        /// <summary>
        /// 下载
        /// </summary>
        /// <param name="dcmPathList">Dictionary(文件名称.dcm,共享文件夹路径) </param>
        public static void Down(Dictionary<string, string> dcmPathList)
        {
            if (!Directory.Exists(Constant.DcmPath))
                Directory.CreateDirectory(Constant.DcmPath); 
            var i = 0;
            foreach (var item in dcmPathList)
            {
                try
                {
                    if (File.Exists(Path.Combine(Constant.DcmPath, item.Key))) continue;
                    using var client = new WebClient();
                    // 配置授权账户密码
                    var credentials = new NetworkCredential(Constant.UserName, Constant.Password);
                    client.Credentials = credentials;
                    var buffer = client.DownloadData(item.Value);
                    var isSave = Bytes2File(buffer, Constant.DcmPath, item.Key);
                    if (isSave) i++;
                }
                catch (Exception e)
                {
                    Console.WriteLine($"[Down][Error]" + item.Key + " | " + e.Message);
                }
            }

            Console.WriteLine($"[DCM文件下载成功]" + i); 
        }

        /// <summary>
        /// 将byte数组转换为文件并保存到指定地址
        /// </summary>
        /// <param name="buff">byte数组</param>
        /// <param name="path">保存地址</param>
        /// <param name="fileName"></param>
        public static bool Bytes2File(byte[] buff, string path, string fileName)
        {
            try
            {
                //如果不存在就创建Enclosure文件夹 
                if (Directory.Exists(path) == false)
                    Directory.CreateDirectory(path);

                if (File.Exists(path + fileName))
                    File.Delete(path + fileName);

                var fs = new FileStream(path + fileName, FileMode.CreateNew);
                var bw = new BinaryWriter(fs);
                bw.Write(buff, 0, buff.Length);
                bw.Close();
                fs.Close();
                return true;
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                return false;
            }
        }
    }
}