/*
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.exoplatform.services.ftp.client;

import org.exoplatform.container.ExoContainer;
import org.exoplatform.container.ExoContainerContext;
import org.exoplatform.services.ftp.FtpConst;
import org.exoplatform.services.ftp.FtpContext;
import org.exoplatform.services.ftp.command.FtpCommand;
import org.exoplatform.services.log.ExoLogger;
import org.exoplatform.services.log.Log;

import java.net.Socket;
import java.net.SocketException;

/**
 * Created by The eXo Platform SAS Author : Vitaly Guly <gavrik-vetal@ukr.net/mail.ru>
 * 
 * @version $Id: $
 */

public class FtpClientCommandThread extends Thread
{

   private static Log log = ExoLogger.getLogger(FtpConst.FTP_PREFIX + "FtpClientCommandThread");

   protected FtpClientSession clientSession;

   public FtpClientCommandThread(FtpClientSession clientSession)
   {
      this.clientSession = clientSession;
   }

   public void run()
   {

      ExoContainer container = clientSession.getFtpServer().getConfiguration().getPortalContainer();

      if (container == null)
      {
         if (log.isDebugEnabled())
         {
            log.debug("No Portal Container found.");
         }
         container = ExoContainerContext.getTopContainer();
      }

      try
      {
         ExoContainerContext.setCurrentContainer(container);

         while (true)
         {
            try
            {
               String command = readLine();

               if (command == null)
               {
                  break;
               }

               if (!"".equals(command))
               {
                  String logStr = "";
                  String[] comms = command.split(" ");

                  FtpCommand curCommand = clientSession.getFtpServer().getCommand(comms[0].toUpperCase());

                  logStr = comms[0].toUpperCase();

                  if (curCommand != null)
                  {
                     if (comms.length > 1)
                     {
                        for (int i = 2; i < comms.length; i++)
                        {
                           if ("".equals(comms[i]))
                           {
                              comms[1] += " ";
                           }
                           else
                           {
                              comms[1] += " " + comms[i];
                           }
                        }

                        logStr += " " + comms[1];
                     }

                     FtpContext ftpContext = new FtpContext(clientSession, comms);
                     curCommand.execute(ftpContext);
                  }
                  else
                  {
                     clientSession.reply(String.format(FtpConst.Replyes.REPLY_500, comms[0].toUpperCase()));
                     clientSession.setPrevCommand(null);
                  }

               }
            }
            catch (SocketException exc)
            {
               break;
            }
            catch (Exception exc)
            {
               log.info("Unhandled exception. " + exc.getMessage(), exc);
               break;
            }
         }

         try
         {
            clientSession.logout();
         }
         catch (Exception exc)
         {
            log.info("Unhandled exception. " + exc.getMessage(), exc);
         }
      }
      finally
      {
         ExoContainerContext.setCurrentContainer(null);
      }

   }

   protected String readLine() throws Exception
   {
      int[] buffer = new int[4 * 1024];
      int bufPos = 0;
      byte prevByte = 0;

      Socket clientSocket = clientSession.getClientSocket();

      while (true)
      {
         int received = clientSocket.getInputStream().read();
         if (received < 0)
         {
            return null;
         }

         clientSession.refreshTimeOut();

         buffer[bufPos] = (byte)received;
         bufPos++;

         if (prevByte == '\r' && received == '\n')
         {
            byte[] commandLine = new byte[bufPos - 2];
            for (int i = 0; i < bufPos - 2; i++)
            {
               commandLine[i] = (byte)buffer[i];
            }

            try
            {
               String encoding = clientSession.getFtpServer().getConfiguration().getClientSideEncoding();
               String readyCommand = new String(commandLine, encoding);

               if (log.isDebugEnabled())
               {
                  log.debug("FTP_CMD:[" + readyCommand + "]");
               }

               return readyCommand;
            }
            catch (Exception exc)
            {
               log.info("Unahdled exception. " + exc.getMessage());
               exc.printStackTrace();
            }
         }

         prevByte = (byte)received;
      }
   }

}
