/*

 *   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");

	}

}