/*

  *   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.Channel;

 import org.sonews.storage.StorageBackendException;

 /**

  * Class handling the ARTICLE, BODY and HEAD commands.

  * @author Christian Lins

  * @author Dennis Schwerdel

  * @since n3tpd/0.1

  */

 public class ArticleCommand implements Command

 {

 	@Override

 	public String[] getSupportedCommandStrings()

 	{

 		return new String[] {"ARTICLE", "BODY", "HEAD"};

 	}

 	@Override

 	public boolean hasFinished()

 	{

 		return true;

 	}

 	@Override

 	public String impliedCapability()

 	{

 		return null;

 	}

 	@Override

 	public boolean isStateful()

 	{

 		return false;

 	}

 	// TODO: Refactor this method to reduce its complexity!

 	@Override

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

 		throws IOException

 	{

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

 		Article article = null;

 		long artIndex = -1;

 		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 {

 				Channel currentGroup = conn.getCurrentChannel();

 				if (currentGroup == null) {

 					conn.println("400 no group selected");

 					return;

 				}

 				artIndex = Long.parseLong(command[1]);

 				article = currentGroup.getArticle(artIndex);

 			} 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);

 		}

 		if (command[0].equalsIgnoreCase("ARTICLE")) {

 			conn.println("220 " + artIndex + " " + article.getMessageID()

 				+ " article retrieved - head and body follow");

 			conn.println(article.getHeaderSource());

 			conn.println("");

 			conn.println(article.getBody());

 			conn.println(".");

 		} else if (command[0].equalsIgnoreCase("BODY")) {

 			conn.println("222 " + artIndex + " " + article.getMessageID() + " body");

 			conn.println(article.getBody());

 			conn.println(".");

 		} /*

 		 * HEAD: This command is mandatory.

 		 *

 		 * Syntax

 		 *    HEAD message-id

 		 *    HEAD number

 		 *    HEAD

 		 *

 		 * Responses

 		 *

 		 * First form (message-id specified)

 		 *  221 0|n message-id    Headers follow (multi-line)

 		 *  430                   No article with that message-id

 		 *

 		 * Second form (article number specified)

 		 *  221 n message-id      Headers follow (multi-line)

 		 *  412                   No newsgroup selected

 		 *  423                   No article with that number

 		 *

 		 * Third form (current article number used)

 		 *  221 n message-id      Headers follow (multi-line)

 		 *  412                   No newsgroup selected

 		 *  420                   Current article number is invalid

 		 *

 		 * Parameters

 		 *  number        Requested article number

 		 *  n             Returned article number

 		 *  message-id    Article message-id

 		 */ else if (command[0].equalsIgnoreCase("HEAD")) {

 			conn.println("221 " + artIndex + " " + article.getMessageID()

 				+ " Headers follow (multi-line)");

 			conn.println(article.getHeaderSource());

 			conn.println(".");

 		}

 	}

 }