/*

 *   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");

    }

  }

}