/*

  *   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.net.InetSocketAddress;

 import java.util.List;

 import org.sonews.config.Config;

 import org.sonews.daemon.NNTPConnection;

 import org.sonews.storage.StorageBackendException;

 import org.sonews.storage.StorageManager;

 import org.sonews.feed.FeedManager;

 import org.sonews.feed.Subscription;

 import org.sonews.storage.Group;

 import org.sonews.util.Stats;

 /**

  * The XDAEMON command allows a client to get/set properties of the

  * running server daemon. Only locally connected clients are allowed to

  * use this command.

  * The restriction to localhost connection can be suppressed by overriding

  * the sonews.xdaemon.host bootstrap config property.

  * @author Christian Lins

  * @since sonews/0.5.0

  */

 public class XDaemonCommand implements Command

 {

   @Override

   public String[] getSupportedCommandStrings()

   {

     return new String[]{"XDAEMON"};

   }

   @Override

   public boolean hasFinished()

   {

     return true;

   }

   @Override

   public String impliedCapability()

   {

     return null;

   }

   @Override

   public boolean isStateful()

   {

     return false;

   }

   private void channelAdd(String[] commands, NNTPConnection conn)

     throws IOException, StorageBackendException

   {

     String groupName = commands[2];

     if(StorageManager.current().isGroupExisting(groupName))

     {

       conn.println("400 group " + groupName + " already existing!");

     }

     else

     {

       StorageManager.current().addGroup(groupName, Integer.parseInt(commands[3]));

       conn.println("200 group " + groupName + " created");

     }

   }

   // TODO: Refactor this method to reduce complexity!

   @Override

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

     throws IOException, StorageBackendException

   {

     InetSocketAddress addr = (InetSocketAddress)conn.getSocketChannel().socket()

       .getRemoteSocketAddress();

     if(addr.getHostName().equals(

       Config.inst().get(Config.XDAEMON_HOST, "localhost")))

     {

       String[] commands = line.split(" ", 4);

       if(commands.length == 3 && commands[1].equalsIgnoreCase("LIST"))

       {

         if(commands[2].equalsIgnoreCase("CONFIGKEYS"))

         {

           conn.println("100 list of available config keys follows");

           for(String key : Config.AVAILABLE_KEYS)

           {

             conn.println(key);

           }

           conn.println(".");

         }

         else if(commands[2].equalsIgnoreCase("PEERINGRULES"))

         {

           List<Subscription> pull = 

             StorageManager.current().getSubscriptions(FeedManager.TYPE_PULL);

           List<Subscription> push =

             StorageManager.current().getSubscriptions(FeedManager.TYPE_PUSH);

           conn.println("100 list of peering rules follows");

           for(Subscription sub : pull)

           {

             conn.println("PULL " + sub.getHost() + ":" + sub.getPort()

               + " " + sub.getGroup());

           }

           for(Subscription sub : push)

           {

             conn.println("PUSH " + sub.getHost() + ":" + sub.getPort()

               + " " + sub.getGroup());

           }

           conn.println(".");

         }

         else

         {

           conn.println("401 unknown sub command");

         }

       }

       else if(commands.length == 3 && commands[1].equalsIgnoreCase("DELETE"))

       {

         StorageManager.current().delete(commands[2]);

         conn.println("200 article " + commands[2] + " deleted");

       }

       else if(commands.length == 4 && commands[1].equalsIgnoreCase("GROUPADD"))

       {

         channelAdd(commands, conn);

       }

       else if(commands.length == 3 && commands[1].equalsIgnoreCase("GROUPDEL"))

       {

         Group group = StorageManager.current().getGroup(commands[2]);

         if(group == null)

         {

           conn.println("400 group not found");

         }

         else

         {

           group.setFlag(Group.DELETED);

           group.update();

           conn.println("200 group " + commands[2] + " marked as deleted");

         }

       }

       else if(commands.length == 4 && commands[1].equalsIgnoreCase("SET"))

       {

         String key = commands[2];

         String val = commands[3];

         Config.inst().set(key, val);

         conn.println("200 new config value set");

       }

       else if(commands.length == 3 && commands[1].equalsIgnoreCase("GET"))

       {

         String key = commands[2];

         String val = Config.inst().get(key, null);

         if(val != null)

         {

           conn.println("100 config value for " + key + " follows");

           conn.println(val);

           conn.println(".");

         }

         else

         {

           conn.println("400 config value not set");

         }

       }

       else if(commands.length >= 3 && commands[1].equalsIgnoreCase("LOG"))

       {

         Group group = null;

         if(commands.length > 3)

         {

           group = Group.getByName(commands[3]);

         }

         if(commands[2].equalsIgnoreCase("CONNECTED_CLIENTS"))

         {

           conn.println("100 number of connections follow");

           conn.println(Integer.toString(Stats.getInstance().connectedClients()));

           conn.println(".");

         }

         else if(commands[2].equalsIgnoreCase("POSTED_NEWS"))

         {

           conn.println("100 hourly numbers of posted news yesterday");

           for(int n = 0; n < 24; n++)

           {

             conn.println(n + " " + Stats.getInstance()

               .getYesterdaysEvents(Stats.POSTED_NEWS, n, group));

           }

           conn.println(".");

         }

         else if(commands[2].equalsIgnoreCase("GATEWAYED_NEWS"))

         {

           conn.println("100 hourly numbers of gatewayed news yesterday");

           for(int n = 0; n < 24; n++)

           {

             conn.println(n + " " + Stats.getInstance()

               .getYesterdaysEvents(Stats.GATEWAYED_NEWS, n, group));

           }

           conn.println(".");

         }

         else if(commands[2].equalsIgnoreCase("TRANSMITTED_NEWS"))

         {

           conn.println("100 hourly numbers of news transmitted to peers yesterday");

           for(int n = 0; n < 24; n++)

           {

             conn.println(n + " " + Stats.getInstance()

               .getYesterdaysEvents(Stats.FEEDED_NEWS, n, group));

           }

           conn.println(".");

         }

         else if(commands[2].equalsIgnoreCase("HOSTED_NEWS"))

         {

           conn.println("100 number of overall hosted news");

           conn.println(Integer.toString(Stats.getInstance().getNumberOfNews()));

           conn.println(".");

         }

         else if(commands[2].equalsIgnoreCase("HOSTED_GROUPS"))

         {

           conn.println("100 number of hosted groups");

           conn.println(Integer.toString(Stats.getInstance().getNumberOfGroups()));

           conn.println(".");

         }

         else if(commands[2].equalsIgnoreCase("POSTED_NEWS_PER_HOUR"))

         {

           conn.println("100 posted news per hour");

           conn.println(Double.toString(Stats.getInstance().postedPerHour(-1)));

           conn.println(".");

         }

         else if(commands[2].equalsIgnoreCase("FEEDED_NEWS_PER_HOUR"))

         {

           conn.println("100 feeded news per hour");

           conn.println(Double.toString(Stats.getInstance().feededPerHour(-1)));

           conn.println(".");

         }

         else if(commands[2].equalsIgnoreCase("GATEWAYED_NEWS_PER_HOUR"))

         {

           conn.println("100 gatewayed news per hour");

           conn.println(Double.toString(Stats.getInstance().gatewayedPerHour(-1)));

           conn.println(".");

         }

         else

         {

           conn.println("401 unknown sub command");

         }

       }

       else if(commands.length >= 3 && commands[1].equalsIgnoreCase("PLUGIN"))

       {

       }

       else

       {

         conn.println("400 invalid command usage");

       }

     }

     else

     {

       conn.println("501 not allowed");

     }

   }

 }