/*

 *   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 == 5 && commands[1].equalsIgnoreCase("GROUPFLAG")) {

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

				String flagName = commands[4];

				if(commands[3].equalsIgnoreCase("SET")) {

					if(flagName.equals("MAILINGLIST")) {

						group.setFlag(Group.MAILINGLIST);

					} else if(flagName.equals("DELETED")) {

						group.setFlag(Group.DELETED);

					} else if(flagName.equals("READONLY")) {

						group.setFlag(Group.READONLY);

					}

				} else if(commands[3].equalsIgnoreCase("UNSET")) {

					if(flagName.equals("MAILINGLIST")) {

						group.unsetFlag(Group.MAILINGLIST);

					} else if(flagName.equals("DELETED")) {

						group.unsetFlag(Group.DELETED);

					} else if(flagName.equals("READONLY")) {

						group.unsetFlag(Group.READONLY);

					}

				} else {

					conn.println("500 invalid command usage");

				}

				StorageManager.current().update(group);

			} 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 = StorageManager.current().getGroup(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")) {

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

			} else {

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

			}

		} else {

			conn.println("501 not allowed");

		}

	}

}