/*

 *   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 org.sonews.storage.Article;

import org.sonews.daemon.NNTPConnection;

import org.sonews.storage.StorageBackendException;

/**

 * Implementation of the STAT command.

 * @author Christian Lins

 * @since sonews/0.5.0

 */

public class StatCommand implements Command

{

  @Override

  public String[] getSupportedCommandStrings()

  {

    return new String[]{"STAT"};

  }

  @Override

  public boolean hasFinished()

  {

    return true;

  }

  @Override

  public String impliedCapability()

  {

    return null;

  }

  @Override

  public boolean isStateful()

  {

    return false;

  }

  // TODO: Method has various exit points => Refactor!

  @Override

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

    throws IOException, StorageBackendException

  {

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

    Article article = null;

    if(command.length == 1)

    {

      article = conn.getCurrentArticle();

      if(article == null)

      {

        conn.println("420 no current article has been selected");

        return;

      }

    }

    else if(command[1].matches(NNTPConnection.MESSAGE_ID_PATTERN))

    {

      // Message-ID

      article = Article.getByMessageID(command[1]);

      if (article == null)

      {

        conn.println("430 no such article found");

        return;

      }

    }

    else

    {

      // Message Number

      try

      {

        long aid = Long.parseLong(command[1]);

        article = conn.getCurrentChannel().getArticle(aid);

      }

      catch(NumberFormatException ex)

      {

        ex.printStackTrace();

      }

      catch(StorageBackendException ex)

      {

        ex.printStackTrace();

      }

      if (article == null)

      {

        conn.println("423 no such article number in this group");

        return;

      }

      conn.setCurrentArticle(article);

    }

    conn.println("223 " + conn.getCurrentChannel().getIndexOf(article) + " "

      + article.getMessageID()

      + " article retrieved - request text separately");

  }

}