/*

 *   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;

import java.sql.Driver;

import java.sql.DriverManager;

import java.util.Enumeration;

import java.util.Date;

import java.util.logging.Level;

import org.sonews.config.Config;

import org.sonews.daemon.ChannelLineBuffers;

import org.sonews.daemon.CommandSelector;

import org.sonews.daemon.Connections;

import org.sonews.daemon.NNTPDaemon;

import org.sonews.feed.FeedManager;

import org.sonews.mlgw.MailPoller;

import org.sonews.storage.StorageBackendException;

import org.sonews.storage.StorageManager;

import org.sonews.storage.StorageProvider;

import org.sonews.util.Log;

import org.sonews.util.Purger;

import org.sonews.util.io.Resource;

/**

 * Startup class of the daemon.

 * @author Christian Lins

 * @since sonews/0.5.0

 */

public final class Main {

	/** Version information of the sonews daemon */

	public static final String VERSION = "sonews/1.1.0";

	/** The server's startup date */

	public static final Date STARTDATE = new Date();

	/**

	 * The main entrypoint.

	 * @param args

	 * @throws Exception

	 */

	public static void main(String[] args) throws Exception {

		System.out.println(VERSION);

		Thread.currentThread().setName("Mainthread");

		// Command line arguments

		boolean feed = false;  // Enable feeding?

		boolean mlgw = false;  // Enable Mailinglist gateway?

		int port = -1;

		for (int n = 0; n < args.length; n++) {

			if (args[n].equals("-c") || args[n].equals("-config")) {

				Config.inst().set(Config.LEVEL_CLI, Config.CONFIGFILE, args[++n]);

				System.out.println("Using config file " + args[n]);

			} else if (args[n].equals("-dumpjdbcdriver")) {

				System.out.println("Available JDBC drivers:");

				Enumeration<Driver> drvs = DriverManager.getDrivers();

				while (drvs.hasMoreElements()) {

					System.out.println(drvs.nextElement());

				}

				return;

			} else if (args[n].equals("-feed")) {

				feed = true;

			} else if (args[n].equals("-h") || args[n].equals("-help")) {

				printArguments();

				return;

			} else if (args[n].equals("-mlgw")) {

				mlgw = true;

			} else if (args[n].equals("-p")) {

				port = Integer.parseInt(args[++n]);

			} else if (args[n].equals("-plugin-storage")) {

				System.out.println("Warning: -plugin-storage is not implemented!");

			} else if (args[n].equals("-plugin-command")) {

				try {

					CommandSelector.addCommandHandler(args[++n]);

				} catch (Exception ex) {

					StringBuilder strBuf = new StringBuilder();

					strBuf.append("Could not load command plugin: ");

					strBuf.append(args[n]);

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

					Log.get().log(Level.INFO, "Main.java", ex);

				}

			} else if (args[n].equals("-plugin-storage")) {

				System.out.println("Warning: -plugin-storage is not implemented!");

			} else if (args[n].equals("-v") || args[n].equals("-version")) {

				// Simply return as the version info is already printed above

				return;

			}

		}

		// Try to load the JDBCDatabase;

		// Do NOT USE BackendConfig or Log classes before this point because they require

		// a working JDBCDatabase connection.

		try {

			String provName = Config.inst().get(Config.LEVEL_FILE,

					Config.STORAGE_PROVIDER, "org.sonews.storage.impl.JDBCDatabaseProvider");

			StorageProvider sprov = StorageManager.loadProvider(provName);

			StorageManager.enableProvider(sprov);

			// Make sure some elementary groups are existing

			if (!StorageManager.current().isGroupExisting("control")) {

				StorageManager.current().addGroup("control", 0);

				Log.get().info("Group 'control' created.");

			}

		} catch (StorageBackendException ex) {

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

			System.err.println("Database initialization failed with " + ex.toString());

			System.err.println("Make sure you have specified the correct database"

							+ " settings in sonews.conf!");

			return;

		}

		ChannelLineBuffers.allocateDirect();

		// Add shutdown hook

		Runtime.getRuntime().addShutdownHook(new ShutdownHook());

		// Start the listening daemon

		if (port <= 0) {

			port = Config.inst().get(Config.PORT, 119);

		}

		final NNTPDaemon daemon = NNTPDaemon.createInstance(port);

		daemon.start();

		// Start Connections purger thread...

		Connections.getInstance().start();

		// Start mailinglist gateway...

		if (mlgw) {

			new MailPoller().start();

		}

		// Start feeds

		if (feed) {

			FeedManager.startFeeding();

		}

		Purger purger = new Purger();

		purger.start();

		// Wait for main thread to exit (setDaemon(false))

		daemon.join();

	}

	private static void printArguments() {

		String usage = Resource.getAsString("helpers/usage", true);

		System.out.println(usage);

	}

	private Main() {

	}

}