using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Mail;
using System.Web;
using System.Net;
using System.Text.RegularExpressions;
using System.Net.Sockets;
using System.IO;
using System.Collections;
using System.Threading;

namespace Com.Web
{
  /// <summary>
  /// 邮箱类
  /// </summary>
  public class CheckEmailInfo
  {
    public string server { get; set; }//服务器
    public string user { get; set; }//用户名
    public string pwd { get; set; }//密码
  }

  /// <summary>
  /// SendEmail通用类，通过smtp服务器发送邮件
  /// </summary>
  public class SendEmail
  {
    public Dictionary<string, string> smtpServer;
    public Dictionary<string, string> popServer;

    public SendEmail()
    {     
      IniSmtpServer();
      IniPopServer();
    }

    /// <summary>
    /// 初始化常用smtpServer，用于绑定下拉选择菜单
    /// </summary>
    private void IniSmtpServer()
    {
      smtpServer = new Dictionary<string, string>();
      smtpServer.Add("网易163邮箱", "smtp.163.com");
      smtpServer.Add("网易vip.163邮箱", "smtp.vip.163.com");
      smtpServer.Add("网易126邮箱", "smtp.126.com");
      smtpServer.Add("网易188邮箱", "smtp.188.com");
      smtpServer.Add("新浪邮箱", "smtp.sina.com");
      smtpServer.Add("雅虎邮箱", "smtp.mail.yahoo.com");
      smtpServer.Add("搜狐邮箱", "smtp.sohu.com");
      smtpServer.Add("TOM邮箱", "smtp.tom.com");
      smtpServer.Add("Gmail邮箱", "smtp.gmail.com");
      smtpServer.Add("QQ邮箱", "smtp.qq.com");
      smtpServer.Add("QQ企业邮箱", "smtp.biz.mail.qq.com");
      smtpServer.Add("139邮箱", "smtp.139.com");
      smtpServer.Add("263邮箱", "smtp.263.com");      
    }

    /// <summary>
    /// 初始化常用popServer，用于绑定下拉选择菜单
    /// </summary>
    private void IniPopServer()
    {
      popServer = new Dictionary<string, string>();
      popServer.Add("网易163邮箱", "pop3.163.com");
      popServer.Add("网易vip.163邮箱", "pop3.vip.163.com");
      popServer.Add("网易126邮箱", "pop3.126.com");
      popServer.Add("网易188邮箱", "pop3.188.com");
      popServer.Add("新浪邮箱", "pop3.sina.com");
      popServer.Add("雅虎邮箱", "pop3.mail.yahoo.com");
      popServer.Add("搜狐邮箱", "pop3.sohu.com");
      popServer.Add("TOM邮箱", "pop.tom.com");
      popServer.Add("Gmail邮箱", "pop.gmail.com");
      popServer.Add("QQ邮箱", "pop.qq.com");
      popServer.Add("QQ企业邮箱", "pop.biz.mail.qq.com");
      popServer.Add("139邮箱", "pop.139.com");
      popServer.Add("263邮箱", "pop.263.com");
    }

    /// <summary>
    /// 发送邮件功能
    /// </summary>
    /// <param name="fromEmail">登录邮箱</param>
    /// <param name="password">登录密码</param>
    /// <param name="user">邮件昵称</param>
    /// <param name="title">邮件标题</param>
    /// <param name="toEmail">邮件地址</param>
    /// <param name="email">邮件内容</param>
    /// <param name="smtpServer">smtp服务器</param>
    public bool SendMessage(string fromEmail,string password, string user, string title, string toEmail, string email,string smtpServer)
    {
      try
      {       
        SmtpClient smtp = new SmtpClient(); //实例化一个SmtpClient
        smtp.DeliveryMethod = SmtpDeliveryMethod.Network; //将smtp的出站方式设为 Network
        smtp.EnableSsl = false;//smtp服务器是否启用SSL加密
        smtp.Host = smtpServer;//指定 smtp 服务器          
        smtp.Credentials = new NetworkCredential(fromEmail, password);
        MailMessage mm = new MailMessage(); //实例化一个邮件类
        mm.Priority = MailPriority.High; //邮件的优先级，分为 Low, Normal, High，通常用 Normal即可       
        mm.From = new MailAddress(fromEmail, user, Encoding.GetEncoding(936));
        mm.CC.Add(new MailAddress(toEmail, "", Encoding.GetEncoding(936)));
        mm.Subject = title; //邮件标题
        mm.SubjectEncoding = Encoding.GetEncoding(936);
        mm.IsBodyHtml = true; //邮件正文是否是HTML格式mm.BodyEncoding = Encoding.GetEncoding(936);
        mm.Body = email;
        smtp.Send(mm);
        return true;     
      }
      catch
      {
        return false;
      }
    }

    /// <summary>
    /// 检查邮箱是否正确的委托
    /// </summary>
    delegate bool MyDelegate(object checkEmailInfo);

    /// <summary>
    /// 利用异步方式检查邮箱账号和密码是否正确
    /// </summary>
    public bool CheckUser(string server, string user, string pwd)
    {      
      MyDelegate myDelegate = new MyDelegate(CheckUser);
      CheckEmailInfo checkEmailInfo = new CheckEmailInfo();
      checkEmailInfo.server = server;
      checkEmailInfo.user = user;
      checkEmailInfo.pwd = pwd;
      IAsyncResult result = myDelegate.BeginInvoke(checkEmailInfo, null, null);
      Thread.Sleep(1000);//主线程1秒后检查异步线程是否运行完毕
      if (result.IsCompleted)
      { return myDelegate.EndInvoke(result); }//如果错误的邮箱和密码，函数将会运行很慢
      else
      { return false; }
    }
   

    /// <summary>
    /// 判断用户邮箱账号和密码是否正确
    /// </summary>
    /// <param name="server">PopServer地址</param>
    /// <param name="user">用户名</param>
    /// <param name="pwd">密码</param>
    private bool CheckUser(object checkEmailInfo)
    {     
      CheckEmailInfo checkInfo = (CheckEmailInfo)checkEmailInfo;
      TcpClient sender = new TcpClient(checkInfo.server, 110);//pop协议使用TCP的110端口
      Byte[] outbytes;
      NetworkStream ns;
      StreamReader sr;
      string input;
      string readuser = string.Empty;
      string readpwd = string.Empty;
      try
      {
        ns = sender.GetStream();
        sr = new StreamReader(ns);
        sr.ReadLine();
        //检查用户名和密码
        input = "user " + checkInfo.user+ "\r\n";
        outbytes = Encoding.ASCII.GetBytes(input.ToCharArray());
        ns.Write(outbytes, 0, outbytes.Length);       
        readuser = sr.ReadLine();
        input = "pass " + checkInfo.pwd + "\r\n";
        outbytes =Encoding.ASCII.GetBytes(input.ToCharArray());
        ns.Write(outbytes, 0, outbytes.Length);      
        readpwd = sr.ReadLine();              
        if (readuser.Substring(0, 3) == "+OK" && readpwd.Substring(0, 3) == "+OK")
        { return true; }
        else
        { return false; }
      }
      catch
      {
        return false;
      }
    }
    
    /// <summary>
    /// 判断邮箱格式是否正确
    /// </summary>
    /// <param name="email">邮箱地址</param>
    public bool IsEmail(string email)
    { 
      string paterner = @"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*";
      if (!Regex.IsMatch(email, paterner))
      { return false;}
      else
      {return true;}     
    } 
  }
}