using System;
using System.Text;
using System.Net;
using System.Net.Mail;
using System.Net.Mime;
using System.Threading;
using System.Reflection;
using System.IO;
using System.Globalization;
using System.Linq;

namespace D7DJYMQ
{
    /// <summary>  
    /// 邮件发送类  
    /// </summary>  
    public class SendEmail
    {
        private MailMessage mailMessage = new MailMessage(); //实例化一个邮件类  

        #region 构造函数
        /// <summary>  
        /// 构造函数  
        /// </summary>  
        /// <param name="toAddresses">收件人地址（多个以,号分开）</param>  
        /// <param name="fromAddress">发件人地址</param>  
        /// <param name="title">主题</param>  
        /// <param name="body">正文</param>  
        public SendEmail(string toAddresses, string fromAddress, string title, string body)
            : this(toAddresses, fromAddress, "", "", title, body, false)
        {
        }

        /// <summary>  
        /// 构造函数  
        /// </summary>  
        /// <param name="toAddress">收件人地址</param>  
        /// <param name="fromAddress">发件人地址</param>  
        /// <param name="toName">收件人名字</param>  
        /// <param name="fromName">发件人姓名</param>  
        /// <param name="title">主题</param>  
        /// <param name="body">正文</param>  
        /// <param name="isBodyHtml">正文是否为html格式</param>  
        public SendEmail(string toAddress, string fromAddress, string toName, string fromName, string title, string body, bool isBodyHtml)
        {

            mailMessage.From = new MailAddress(fromAddress, fromName, Encoding.GetEncoding(936));
            if (toName.Equals(""))
                mailMessage.To.Add(toAddress);
            else
                mailMessage.To.Add(new MailAddress(toAddress, toName, Encoding.GetEncoding(936)));

            mailMessage.Subject = title;
            mailMessage.SubjectEncoding = Encoding.GetEncoding(936);

            mailMessage.Body = body;
            mailMessage.IsBodyHtml = isBodyHtml;
            mailMessage.BodyEncoding = Encoding.GetEncoding(936);
        }
        #endregion

        /// <summary>  
        /// 设置SMTP，并且将邮件发送出去  
        /// 所有参数都设置完成后再调用该方法  
        /// </summary>  
        /// <param name="password">发件人密码</param>  
        /// <param name="smtpHost">SMTP服务器地址</param>  
        public void SetSmtp(string password, string smtpHost)
        {
            SetSmtp(mailMessage.From.Address, password, smtpHost, 25, false, MailPriority.Normal);
        }

        /// <summary>  
        /// 设置SMTP，并且将邮件发送出去  
        /// 所有参数都设置完成后再调用该方法  
        /// </summary>  
        /// <param name="address">发件人地址（必须为真实有效的email地址）</param>  
        /// <param name="password">发件人密码</param>  
        /// <param name="smtpHost">SMTP服务器地址</param>  
        /// <param name="smtpPort">SMTP服务器的端口</param>  
        /// <param name="isEnableSsl">SMTP服务器是否启用SSL加密</param>  
        /// <param name="priority">邮件的优先级</param>  
        public void SetSmtp(string address, string password, string smtpHost, int smtpPort, bool isEnableSsl, MailPriority priority)
        {
            SmtpClient smtp = new SmtpClient(smtpHost,smtpPort);
//            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;

            //            smtp.UseDefaultCredentials = true;
            //if (isEnableSsl)
            //{
            //    smtp.UseDefaultCredentials = true;
            //    System.Net.NetworkCredential nc = new System.Net.NetworkCredential(address, password);
            //    smtp.Credentials = nc.GetCredential(smtpHost, smtpPort, "NTLM");
            //}
            //else

            System.Net.NetworkCredential nc = new System.Net.NetworkCredential(address, password);
            smtp.Credentials = nc;


            //smtp.Credentials = new NetworkCredential(address, password);
            //smtp.Host = smtpHost;
            //smtp.Port = smtpPort;


            smtp.EnableSsl = isEnableSsl;
            //            smtp.UseDefaultCredentials = true;
            //           mailMessage.Priority = priority;
            try
            {
                smtp.Send(mailMessage); //发送邮件  
            }
            catch (Exception e)
            {
                smtp.Dispose();
            }
            finally
            {

                smtp.Dispose();
            }
            smtp.Dispose();
        }



        class Mailinfo {
            public SendEmail se { get; set; }
            public string address { get; set; }
            public string password { get; set; }
            public string smtpHost { get; set; }
            public int smtpPort { get; set; }
            public bool isEnableSsl { get; set; }
            public MailPriority priority { get; set; }

            public Mailinfo(SendEmail se, string address, string password, string smtpHost, int smtpPort, bool isEnableSsl, MailPriority priority)
            {
                this.se = se;
                this.address = address;
                this.password = password;
                this.smtpHost = smtpHost;
                this.smtpPort = smtpPort;
                this.isEnableSsl = isEnableSsl;
                this.priority = priority;
            }
        }

        class ThreadMail
        {

            public void FuncSend(object o)
            {
                Mailinfo Mailinfo = o as Mailinfo;

                Mailinfo.se.SetSmtp(Mailinfo.address, Mailinfo.password, Mailinfo.smtpHost, Mailinfo.smtpPort, Mailinfo.isEnableSsl, Mailinfo.priority);
            }
        }

        public void SetSmtp_thread( string address, string password, string smtpHost, int smtpPort, bool isEnableSsl, MailPriority priority) {
            ThreadMail tmail = new ThreadMail();
            //有参调用实例方法，ParameterizedThreadStart是一个委托，input为object,返回值为void
            Thread thread1 = new Thread(new ParameterizedThreadStart(tmail.FuncSend));
            Mailinfo mi = new Mailinfo(this, address, password, smtpHost, smtpPort, isEnableSsl, priority);
            thread1.Start(mi);
        }

        #region //设置邮件地址
        /// <summary>  
        /// 设置更多收件人  
        /// </summary>  
        /// <param name="toAddresses">收件人地址</param>  
        public void SetMoreToAddress(string toAddresses)
        {
            mailMessage.To.Add(toAddresses);
        }

        /// <summary>  
        /// 设置更多收件人  
        /// </summary>  
        /// <param name="toAddresses">收件人地址</param>  
        /// <param name="toName">收件人名字</param>  
        public void SetMoreToAddress(string toAddress, string toName)
        {
            mailMessage.To.Add(new MailAddress(toAddress, toName, Encoding.GetEncoding(936)));
        }

        /// <summary>  
        /// 设置抄送者（多个以,号分开）  
        /// </summary>  
        /// <param name="ccAddresses">抄送者地址</param>  
        public void SetCarbonCopyFor(string ccAddresses)
        {
            mailMessage.CC.Add(ccAddresses);
        }

        /// <summary>  
        /// 设置抄送者  
        /// </summary>  
        /// <param name="ccAddress">抄送者地址</param>  
        /// <param name="ccName">抄送者名字</param>  
        public void SetCarbonCopyFor(string ccAddress, string ccName)
        {
            mailMessage.Bcc.Add(new MailAddress(ccAddress, ccName, Encoding.GetEncoding(936)));
        }

        /// <summary>  
        /// 设置密送者（多个以,号分开）  
        /// </summary>  
        /// <param name="bccAddresses">密送者</param>  
        public void SetBlindCarbonCopyFor(string bccAddresses)
        {
            mailMessage.Bcc.Add(bccAddresses);
        }

        /// <summary>  
        /// 设置密送者  
        /// </summary>  
        /// <param name="bccAddress">密送者</param>  
        /// <param name="bccName">密送者名字</param>  
        public void SetBlindCarbonCopyFor(string bccAddress, string bccName)
        {
            mailMessage.Bcc.Add(new MailAddress(bccAddress, bccName, Encoding.GetEncoding(936)));
        }
        #endregion

        #region 添加附件
        /// <summary>  
        /// 添加附件（自动识别文件类型）  
        /// </summary>  
        /// <param name="fileName">单个文件的路径</param>  
        public void Attachments(string fileName)
        {
            mailMessage.Attachments.Add(new Attachment(fileName));
        }

        /// <summary>  
        /// 添加附件（默认为富文本RTF格式）  
        /// </summary>  
        /// <param name="fileName">单个文件的路径</param>  
        public void AttachmentsForRTF(string fileName)
        {
            mailMessage.Attachments.Add(new Attachment(fileName, MediaTypeNames.Application.Rtf));
        }


        //public void SaveToEml(string emlFileAbsolutePath)
        //{
        //    const BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy;
        //    using (MemoryStream ms = new MemoryStream())
        //    {
        //        Assembly assembly = typeof(System.Net.Mail.SmtpClient).Assembly;
        //        Type tMailWriter = assembly.GetType("System.Net.Mail.MailWriter");
        //        object mailWriter = Activator.CreateInstance(tMailWriter, flags, null, new object[] { ms }, CultureInfo.InvariantCulture);
        //        mailMessage.GetType().GetMethod("Send", flags).Invoke(mailMessage, new object[] { mailWriter, true });
        //        File.WriteAllText(emlFileAbsolutePath, System.Text.Encoding.Default.GetString(ms.ToArray()), System.Text.Encoding.Default);
        //    }
        //}

        public struct MailBillType
        {
            public const string 舱单 = "EDI";
            public const string VGM = "VGM";
        }

        public struct MailInfo { 
            public const string 舱单_系统参数路径名 = "DSFTP_EDI_FTP_EDIPATH";

            public const string VGM_系统参数路径名 = "DSFTP_EDI_FTP_VGMPATH";

            public const string 舱单_标题头部_旧可解析 = "申请发送 ";

            public const string 舱单_标题头部_新 = "舱单发送-";

            public const string VGM_标题头部_旧可解析 = "申请发送VGM-";

            public const string VGM_标题头部_新 = "VGM发送-";
        }


        public void SaveToEml(string emlFileAbsolutePath, string billtype)
        {

            var assembly = typeof(SmtpClient).Assembly;
            var mailWriterType = assembly.GetType("System.Net.Mail.MailWriter");

            using (var memoryStream = new MemoryStream())
            {
                // Get reflection info for MailWriter contructor
                var mailWriterContructor = mailWriterType.GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { typeof(Stream) }, null);

                // Construct MailWriter object with our FileStream
                var mailWriter = mailWriterContructor.Invoke(new object[] { memoryStream });

                // Get reflection info for Send() method on MailMessage
                var sendMethod = typeof(MailMessage).GetMethod("Send", BindingFlags.Instance | BindingFlags.NonPublic);

                //20210622 标题 按GB2312转base64   

                var mailhead = "";
                var ftphead = "";

                if(billtype== MailBillType.舱单)
                {
                    mailhead = MailInfo.舱单_标题头部_新;
                    ftphead = MailInfo.舱单_标题头部_旧可解析;
                }
                if (billtype == MailBillType.VGM)
                {
                    mailhead = MailInfo.VGM_标题头部_新;
                    ftphead = MailInfo.VGM_标题头部_旧可解析;
                }
                string title = Convert.ToBase64String(System.Text.Encoding.GetEncoding(936).GetBytes(mailMessage.Subject.Replace(mailhead, ftphead)));
                var codedtitle= "=?GB2312?B?"+title+"?=";

                // Call method passing in MailWriter
                sendMethod.Invoke(mailMessage, BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { mailWriter, true, true }, null);

                // Finally get reflection info for Close() method on our MailWriter
                var closeMethod = mailWriter.GetType().GetMethod("Close", BindingFlags.Instance | BindingFlags.NonPublic);

                // Call close method
                closeMethod.Invoke(mailWriter, BindingFlags.Instance | BindingFlags.NonPublic, null, new object[] { }, null);

                var _str = System.Text.Encoding.UTF8.GetString(memoryStream.ToArray()).Replace(mailMessage.Subject, codedtitle);

                File.WriteAllText(emlFileAbsolutePath, _str, System.Text.Encoding.Default);
                //return Encoding.ASCII.GetString(memoryStream.ToArray());
            }
            
        }

        public MailMessage getMailMessage() {
            return mailMessage;
        }

        #endregion

        /// <summary>
        /// 将MailMessage保存为eml文件
        /// </summary>
        /// <param name="msg">待保存的具有内容的MailMessage</param>
        /// <param name="emlFileAbsolutePath">保存后的eml文件的路径</param>
        public void SaveToEml(string emlFileAbsolutePath)
        {
            const BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy;
            using (MemoryStream ms = new MemoryStream())
            {
                Assembly assembly = typeof(System.Net.Mail.SmtpClient).Assembly;
                Type tMailWriter = assembly.GetType("System.Net.Mail.MailWriter");
                object mailWriter = Activator.CreateInstance(tMailWriter, flags, null, new object[] { ms }, CultureInfo.InvariantCulture);
                mailMessage.GetType().GetMethod("Send", flags).Invoke(mailMessage, new object[] { mailWriter, true });
                File.WriteAllText(emlFileAbsolutePath, System.Text.Encoding.Default.GetString(ms.ToArray()), System.Text.Encoding.Default);
            }
        }


    }
}