/*********************************************************************************
 *  TotalCross Software Development Kit                                          *
 *  Copyright (C) 2000-2012 SuperWaba Ltda.                                      *
 *  All Rights Reserved                                                          *
 *                                                                               *
 *  This library and virtual machine is distributed in the hope that it will     *
 *  be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of    *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                         *
 *                                                                               *
 *  This file is covered by the GNU LESSER GENERAL PUBLIC LICENSE VERSION 3.0    *
 *  A copy of this license is located in file license.txt at the root of this    *
 *  SDK or can be downloaded here:                                               *
 *  http://www.gnu.org/licenses/lgpl-3.0.txt                                     *
 *                                                                               *
 *********************************************************************************/



package totalcross.net.mail;

import totalcross.io.*;
import totalcross.net.*;
import totalcross.sys.*;
import totalcross.util.*;

/**
 * A POP3 Message Store. Contains only one folder, "INBOX".
 * 
 * @since TotalCross 1.13
 */
public class POP3Store extends Store
{
   private Folder inbox;

   private String host;
   private int port;
   private String user;
   private String pass;

   public static final String ROOT = "INBOX";

   static final String USER = "USER ";
   static final String PASS = "PASS ";
   static final String STAT = "STAT ";
   static final String LIST = "LIST ";
   static final String TOP = "TOP ";
   static final String UIDL = "UIDL ";
   static final String QUIT = "QUIT \r\n";

   protected POP3Store(MailSession session)
   {
      super(session);
      host = session.get(MailSession.POP3_HOST).toString();
      port = ((Properties.Int) session.get(MailSession.POP3_PORT)).value;
      user = session.get(MailSession.POP3_USER).toString();
      pass = session.get(MailSession.POP3_PASS).toString();
   }

   public void connect() throws AuthenticationException, MessagingException
   {
      try
      {
         socketFactory = (SocketFactory) Class.forName("totalcross.net.SocketFactory").newInstance();
         connection = socketFactory.createSocket(host, port);
         connection.readLine();

         authenticate(user, pass);
      }
      catch (InstantiationException e)
      {
         throw new MessagingException(e);
      }
      catch (IllegalAccessException e)
      {
         throw new MessagingException(e);
      }
      catch (ClassNotFoundException e)
      {
         throw new MessagingException(e);
      }
      catch (UnknownHostException e)
      {
         throw new MessagingException(e);
      }
      catch (IOException e)
      {
         throw new MessagingException(e);
      }
   }

   public Folder getDefaultFolder()
   {
      return new POP3Folder(this);
   }

   /**
    * Only the name "INBOX" is supported.
    */
   public Folder getFolder(String name)
   {
      if (!name.equals(ROOT))
         return null;
      return new POP3Folder(this);
   }

   public void close() throws MessagingException
   {
      if (inbox != null)
         inbox.close(false);

      try
      {
         connection.writeBytes(QUIT);
         connection.readLine();
      }
      catch (IOException e)
      {
         throw new MessagingException(e);
      }
   }

   private void authenticate(String user, String pass) throws IOException, AuthenticationException
   {
      String reply;
      connection.writeBytes(USER + user + Convert.CRLF);
      reply = connection.readLine();
      if (!reply.startsWith("+OK"))
         throw new AuthenticationException();

      connection.writeBytes(PASS + pass + Convert.CRLF);
      reply = connection.readLine();
      if (!reply.startsWith("+OK"))
         throw new AuthenticationException();
   }
}