using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Threading;
using System.Text.RegularExpressions;
using Microsoft.Exchange.Data.Mime;
using Microsoft.Exchange.Data.Transport;
using Microsoft.Exchange.Data.Transport.Email;
using Microsoft.Exchange.Data.Transport.Routing;

namespace Samples.Agents.MyRoutingAgent
{
    public class MyRoutingAgentFactory : RoutingAgentFactory
    {
        public override RoutingAgent CreateAgent(SmtpServer server)
        {
            return new MyRoutingAgent();
        }
    }

    public class MyRoutingAgent : RoutingAgent
    {
        public MyRoutingAgent()
        {
            base.OnSubmittedMessage += new SubmittedMessageEventHandler(MyRoutingAgent_OnSubmittedMessage);
        }

        void MyRoutingAgent_OnSubmittedMessage(SubmittedMessageEventSource source, QueuedMessageEventArgs e)
        {
            Regex regex_company_fax = new Regex("(\d+@)company.fax", RegexOptions.IgnoreCase);

            //Alter the P1 headers.The P1 address is used for routing.
            for (int intCounter = e.MailItem.Recipients.Count - 1; intCounter >= 0; intCounter--)
            {
                if (e.MailItem.Recipients[intCounter].Address.IsValid)
                {
                    # region email_header_p1_block
                    //Save the whole email address and local part of the address to strings
                    string strEmailAddress = e.MailItem.Recipients[intCounter].Address.LocalPart + "@" + e.MailItem.Recipients[intCounter].Address.DomainPart;
                    string strLocalPart = e.MailItem.Recipients[intCounter].Address.LocalPart;

                    //Match using the created regex agains the saved email address string
                    Match match_company_fax = regex_company_fax.Match(strEmailAddress);

                    //If the match is successful, move on, otherwise exit
                    if (match_company_fax.Success)
                    {
                        //The match is successful, remove the old address
                        e.MailItem.Recipients.Remove(e.MailItem.Recipients[intCounter]);

                        e.MailItem.Recipients.Add(new RoutingAddress(strLocalPart + "@newcompany.com"));
                    #endregion
                    }
                }
            }

			# region email_header_p2_block
            //Alter the P2 headers so that the mail displays the correct recipient display Name
            EmailRecipientCollection erToRecipientCollection;
            erToRecipientCollection = e.MailItem.Message.To;

            foreach (EmailRecipient rec in erToRecipientCollection)
            {
                Match match_company_fax = regex_company_fax.Match(rec.SmtpAddress);

                if (match_company_fax.Success)
                {
                    string xname = regex_company_fax.Replace(rec.SmtpAddress, "$1myfax.com");

                    rec.DisplayName = xname;
                    rec.SmtpAddress = xname;
                }
            }
			#end region
        }
    }
}