/*

 *   SONEWS News Server

 *   see AUTHORS for the list of contributors

 *

 *   This program is free software: you can redistribute it and/or modify

 *   it under the terms of the GNU General Public License as published by

 *   the Free Software Foundation, either version 3 of the License, or

 *   (at your option) any later version.

 *

 *   This program 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 General Public License for more details.

 *

 *   You should have received a copy of the GNU General Public License

 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

package org.sonews.daemon.command;

import java.io.IOException;

import java.util.List;

import org.sonews.daemon.NNTPConnection;

import org.sonews.storage.Channel;

import org.sonews.storage.StorageBackendException;

/**

 * Class handling the LISTGROUP command.

 * @author Christian Lins

 * @author Dennis Schwerdel

 * @since n3tpd/0.1

 */

public class ListGroupCommand implements Command

{

  @Override

  public String[] getSupportedCommandStrings()

  {

    return new String[]{"LISTGROUP"};

  }

  @Override

  public boolean hasFinished()

  {

    return true;

  }

  @Override

  public boolean isStateful()

  {

    return false;

  }

  @Override

  public void processLine(NNTPConnection conn, final String commandName, byte[] raw)

    throws IOException, StorageBackendException

  {

    final String[] command = commandName.split(" ");

    Channel group;

    if(command.length >= 2)

    {

      group = Channel.getByName(command[1]);

    }

    else

    {

      group = conn.getCurrentChannel();

    }

    if (group == null)

    {

      conn.println("412 no group selected; use GROUP <group> command");

      return;

    }

    List<Long> ids = group.getArticleNumbers();

    conn.println("211 " + ids.size() + " " +

      group.getFirstArticleNumber() + " " + 

      group.getLastArticleNumber() + " list of article numbers follow");

    for(long id : ids)

    {

      // One index number per line

      conn.println(Long.toString(id));

    }

    conn.println(".");

  }

}