/*
 * 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.frameworks.ftpclient.client;

import org.exoplatform.frameworks.ftpclient.FtpConst;
import org.exoplatform.frameworks.ftpclient.commands.FtpCommand;
import org.exoplatform.frameworks.ftpclient.data.FtpDataTransiver;
import org.exoplatform.services.log.ExoLogger;
import org.exoplatform.services.log.Log;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;

/**
 * Created by The eXo Platform SAS .
 * 
 * @author Vitaly Guly
 * @version $Id: $
 */

public class FtpClientSessionImpl implements FtpClientSession
{

   private static final Log LOG = ExoLogger.getLogger("exo.jcr.framework.command.FtpClientSessionImpl");

   protected String host;

   protected int port;

   protected Socket clientSocket = null;

   protected String systemType;

   protected FtpDataTransiver dataTransiver = null;

   public FtpClientSessionImpl(String host, int port)
   {
      // log.info("Starting client...");
      this.host = host;
      this.port = port;
   }

   public boolean connect() throws Exception
   {
      return connect(1);
   }

   public boolean connect(int attemptsCount) throws Exception
   {
      Exception prevExc = null;
      for (int i = 0; i < attemptsCount; i++)
      {
         try
         {
            clientSocket = new Socket();
            SocketAddress sockAddr = new InetSocketAddress(host, port);
            clientSocket.connect(sockAddr);
            // log.info("Connected - " + clientSocket.isConnected());

            boolean connected = false;
            for (int wi = 0; wi < 200; wi++)
            {
               if (clientSocket.isConnected())
               {
                  connected = true;
                  break;
               }
               Thread.sleep(1);
            }

            if (!connected)
            {
               throw new Exception();
            }

            BufferedReader br = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));

            String reply = "";
            while (reply != null && !reply.startsWith("220 "))
            {
               reply = br.readLine();
               // log.info("REPLY - " + reply);
            }

            return true;
         }
         catch (Exception exc)
         {
            prevExc = exc;
         }
         Thread.sleep(3000);
         // log.info(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> sleeping.........");
      }

      LOG.info("unhandled exception. " + prevExc.getMessage(), prevExc);

      return false;
   }

   public void close()
   {
      try
      {
         if (dataTransiver != null)
         {
            dataTransiver.close();
         }

         if (clientSocket == null)
         {
            return;
         }
         if (clientSocket.isConnected())
         {
            clientSocket.close();
         }
      }
      catch (IOException exc)
      {
         LOG.info(FtpConst.EXC_MSG + exc.getMessage(), exc);
      }
   }

   public Socket getClientSocket()
   {
      return clientSocket;
   }

   public int executeCommand(FtpCommand command) throws Exception
   {
      if (clientSocket == null)
      {
         return -1;
      }
      return command.run(this);
   }

   public int executeCommand(FtpCommand command, int expectReply, int attemptsCount) throws Exception
   {
      int reply = -1;
      for (int i = 0; i < attemptsCount; i++)
      {
         reply = command.run(this);
         if (reply == expectReply)
         {
            return reply;
         }
         Thread.sleep(100);
      }
      return reply;
   }

   public void setSystemType(String systemType)
   {
      this.systemType = systemType;
   }

   public String getSystemType()
   {
      return systemType;
   }

   public void setDataTransiver(FtpDataTransiver dataTransiver)
   {
      this.dataTransiver = dataTransiver;
   }

   public FtpDataTransiver getDataTransiver()
   {
      return dataTransiver;
   }

}