using BookingWeb.DB;
using log4net;
using MimeKit;
using MimeKit.Utils;
using MailKit.Net.Smtp;
using Quartz;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace BookingWeb.Job
{
    public class SendMailJob : IJob
    {
        private static readonly int MailSendTryCount = 3;

        private BookingDB bookingDB = new BookingDB();
        private ILog log = LogManager.GetLogger("SendMailJob");

        public void Execute(IJobExecutionContext context)
        {
            var staCreate = SendMailStatus.Create.ToString();
            var staSending = SendMailStatus.Sending.ToString();
            var staSuccess = SendMailStatus.Success.ToString();
            var staFail = SendMailStatus.Fail.ToString();

            var sendMail = bookingDB.SendMails.Where(m => m.STATUS == staCreate).OrderBy(m => m.CREATE_TIME).FirstOrDefault();
            if (sendMail != null)
            {
                //置发送状态
                log.Debug($"准备发送邮件：{sendMail.TITLE}");
                sendMail.STATUS = staSending;
                sendMail.SEND_TIME = DateTime.Now;
                sendMail.TRY_COUNT += 1;
                bookingDB.SaveChanges();

                //获取配置并发送
                var clientConfig = bookingDB.Clients.FirstOrDefault(c => c.GID == sendMail.CLIENT_ID);
                if (clientConfig == null)
                {
                    log.Error($"邮件<{sendMail.TITLE}>发送失败：找不到ID为{sendMail.CLIENT_ID}的CLIENT");
                    return;
                }
                else if (string.IsNullOrEmpty(clientConfig.SMTP_SERVER)
                   || string.IsNullOrEmpty(clientConfig.MAIL_ACCOUNT)
                   || string.IsNullOrEmpty(clientConfig.MAIL_PASSWORD))
                {
                    log.Error($"邮件<{sendMail.TITLE}>发送失败：ID为{sendMail.CLIENT_ID}的CLIENT未正确配置邮件发送服务器");
                    return;
                }
                else
                {
                    var message = new MimeMessage();
                    message.Subject = sendMail.TITLE;
                    message.To.Add(new MailboxAddress(sendMail.SEND_TO));
                    message.MessageId = MimeUtils.GenerateMessageId();
                    message.Date = DateTimeOffset.Now;
                    message.From.Add(new MailboxAddress(clientConfig.MAIL_ACCOUNT));
                    if (!string.IsNullOrEmpty(sendMail.CC_TO))
                    {
                        message.Cc.Add(new MailboxAddress(sendMail.CC_TO));
                    }

                    if (sendMail.BODY_TYPE == SendMailBodyType.Text.ToString())
                    {
                        var plain = new TextPart("plain")
                        {
                            Text = sendMail.BODY
                        };

                        message.Body = plain;
                    }


                    try
                    {
                        using (var client = new SmtpClient())
                        {
                            client.Connect(clientConfig.SMTP_SERVER, clientConfig.SMTP_PORT, clientConfig.SMTP_SSL);
                            client.Authenticate(clientConfig.MAIL_ACCOUNT, clientConfig.MAIL_PASSWORD);
                            client.Send(message);

                            log.Debug($"已发送邮件：{message.Subject}");

                            client.Disconnect(true);
                        }

                        sendMail.STATUS = staSuccess;
                        bookingDB.SaveChanges();
                    }
                    catch (Exception ex)
                    {
                        if (sendMail.TRY_COUNT < MailSendTryCount) //会继续尝试发送
                        {
                            sendMail.STATUS = staCreate;
                            bookingDB.SaveChanges();
                        }
                        else
                        {
                            sendMail.STATUS = staFail;
                            bookingDB.SaveChanges();
                        }

                        log.Error($"发送邮件<{message.Subject}>时出错：");
                        log.Error($"{ex.Message}");
                        log.Error($"{ex.StackTrace}");
                    }
                }
            }

        }
    }
}