/*

  *   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(".");

   }

 }