/*

  *   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.util;

 import java.util.Calendar;

 import java.util.logging.Level;

 import org.sonews.config.Config;

 import org.sonews.storage.Group;

 import org.sonews.storage.StorageBackendException;

 import org.sonews.storage.StorageManager;

 /**

  * Class that capsulates statistical data gathering.

  * @author Christian Lins

  * @since sonews/0.5.0

  */

 public final class Stats {

 	public static final byte CONNECTIONS = 1;

 	public static final byte POSTED_NEWS = 2;

 	public static final byte GATEWAYED_NEWS = 3;

 	public static final byte FEEDED_NEWS = 4;

 	public static final byte MLGW_RUNSTART = 5;

 	public static final byte MLGW_RUNEND = 6;

 	private static Stats instance = new Stats();

 	public static Stats getInstance() {

 		return Stats.instance;

 	}

 	private volatile int connectedClients = 0;

 	private Stats() {

 	}

 	/**

 	 * A generic method that writes event data to the storage backend.

 	 * If event logging is disabled with sonews.eventlog=false this method

 	 * simply does nothing.

 	 * @param type

 	 * @param groupname

 	 */

 	private void addEvent(byte type, String groupname) {

 		try {

 			if (Config.inst().get(Config.EVENTLOG, true)) {

 				Group group = StorageManager.current().getGroup(groupname);

 				if (group != null) {

 					StorageManager.current().addEvent(

 							System.currentTimeMillis(), type, group.getInternalID());

 				}

 			} else {

 				StringBuilder strBuf = new StringBuilder();

 				strBuf.append("Group ");

 				strBuf.append(groupname);

 				strBuf.append(" does not exist.");

 				Log.get().info(strBuf.toString());

 			}

 		} catch (StorageBackendException ex) {

 			Log.get().log(Level.SEVERE, ex.getLocalizedMessage(), ex);

 		}

 	}

 	public void clientConnect() {

 		this.connectedClients++;

 	}

 	public void clientDisconnect() {

 		this.connectedClients--;

 	}

 	public int connectedClients() {

 		return this.connectedClients;

 	}

 	public int getNumberOfGroups() {

 		try {

 			return StorageManager.current().countGroups();

 		} catch (StorageBackendException ex) {

 			Log.get().log(Level.SEVERE, ex.getLocalizedMessage(), ex);

 			return -1;

 		}

 	}

 	public int getNumberOfNews() {

 		try {

 			return StorageManager.current().countArticles();

 		} catch (StorageBackendException ex) {

 			Log.get().log(Level.SEVERE, ex.getLocalizedMessage(), ex);

 			return -1;

 		}

 	}

 	public int getYesterdaysEvents(final byte eventType, final int hour,

 			final Group group) {

 		// Determine the timestamp values for yesterday and the given hour

 		Calendar cal = Calendar.getInstance();

 		int year = cal.get(Calendar.YEAR);

 		int month = cal.get(Calendar.MONTH);

 		int dayom = cal.get(Calendar.DAY_OF_MONTH) - 1; // Yesterday

 		cal.set(year, month, dayom, hour, 0, 0);

 		long startTimestamp = cal.getTimeInMillis();

 		cal.set(year, month, dayom, hour + 1, 0, 0);

 		long endTimestamp = cal.getTimeInMillis();

 		try {

 			return StorageManager.current().getEventsCount(eventType, startTimestamp, endTimestamp, group);

 		} catch (StorageBackendException ex) {

 			Log.get().log(Level.SEVERE, ex.getLocalizedMessage(), ex);

 			return -1;

 		}

 	}

 	public void mailPosted(String groupname) {

 		addEvent(POSTED_NEWS, groupname);

 	}

 	public void mailGatewayed(String groupname) {

 		addEvent(GATEWAYED_NEWS, groupname);

 	}

 	public void mailFeeded(String groupname) {

 		addEvent(FEEDED_NEWS, groupname);

 	}

 	public void mlgwRunStart() {

 		addEvent(MLGW_RUNSTART, "control");

 	}

 	public void mlgwRunEnd() {

 		addEvent(MLGW_RUNEND, "control");

 	}

 	private double perHour(int key, long gid) {

 		try {

 			return StorageManager.current().getEventsPerHour(key, gid);

 		} catch (StorageBackendException ex) {

 			Log.get().log(Level.SEVERE, ex.getLocalizedMessage(), ex);

 			return -1;

 		}

 	}

 	public double postedPerHour(long gid) {

 		return perHour(POSTED_NEWS, gid);

 	}

 	public double gatewayedPerHour(long gid) {

 		return perHour(GATEWAYED_NEWS, gid);

 	}

 	public double feededPerHour(long gid) {

 		return perHour(FEEDED_NEWS, gid);

 	}

 }