/*

  *   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.Set;

 import org.sonews.daemon.CommandSelector;

 import org.sonews.daemon.NNTPConnection;

 import org.sonews.util.io.Resource;

 /**

  * This command provides a short summary of the commands that are

  * understood by this implementation of the server. The help text will

  * be presented as a multi-line data block following the 100 response

  * code (taken from RFC).

  * @author Christian Lins

  * @since sonews/0.5.0

  */

 public class HelpCommand implements Command

 {

 	@Override

 	public boolean hasFinished()

 	{

 		return true;

 	}

 	@Override

 	public String impliedCapability()

 	{

 		return null;

 	}

 	@Override

 	public boolean isStateful()

 	{

 		return true;

 	}

 	@Override

 	public String[] getSupportedCommandStrings()

 	{

 		return new String[] {"HELP"};

 	}

 	@Override

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

 		throws IOException

 	{

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

 		conn.println("100 help text follows");

 		if (line.length() <= 1) {

 			final String[] help = Resource.getAsString("helpers/helptext", true).split("\n");

 			for (String hstr : help) {

 				conn.println(hstr);

 			}

 			Set<String> commandNames = CommandSelector.getCommandNames();

 			for (String cmdName : commandNames) {

 				conn.println(cmdName);

 			}

 		} else {

 			Command cmd = CommandSelector.getInstance().get(command[1]);

 			if (cmd instanceof HelpfulCommand) {

 				conn.println(((HelpfulCommand) cmd).getHelpString());

 			} else {

 				conn.println("No further help information available.");

 			}

 		}

 		conn.println(".");

 	}

 }