/*
 * This file is part of the L2J Mobius project.
 * 
 * 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 com.l2jmobius.gameserver;

import java.util.logging.Level;
import java.util.logging.Logger;

import com.l2jmobius.Config;
import com.l2jmobius.commons.database.DatabaseFactory;
import com.l2jmobius.gameserver.data.sql.impl.ClanTable;
import com.l2jmobius.gameserver.data.sql.impl.OfflineTradersTable;
import com.l2jmobius.gameserver.datatables.BotReportTable;
import com.l2jmobius.gameserver.instancemanager.CastleManorManager;
import com.l2jmobius.gameserver.instancemanager.CeremonyOfChaosManager;
import com.l2jmobius.gameserver.instancemanager.CursedWeaponsManager;
import com.l2jmobius.gameserver.instancemanager.DBSpawnManager;
import com.l2jmobius.gameserver.instancemanager.GlobalVariablesManager;
import com.l2jmobius.gameserver.instancemanager.GrandBossManager;
import com.l2jmobius.gameserver.instancemanager.ItemAuctionManager;
import com.l2jmobius.gameserver.instancemanager.ItemsOnGroundManager;
import com.l2jmobius.gameserver.instancemanager.QuestManager;
import com.l2jmobius.gameserver.model.L2World;
import com.l2jmobius.gameserver.model.actor.instance.L2PcInstance;
import com.l2jmobius.gameserver.model.entity.Hero;
import com.l2jmobius.gameserver.model.olympiad.Olympiad;
import com.l2jmobius.gameserver.network.ClientNetworkManager;
import com.l2jmobius.gameserver.network.EventLoopGroupManager;
import com.l2jmobius.gameserver.network.L2GameClient;
import com.l2jmobius.gameserver.network.SystemMessageId;
import com.l2jmobius.gameserver.network.loginserverpackets.game.ServerStatus;
import com.l2jmobius.gameserver.network.serverpackets.ServerClose;
import com.l2jmobius.gameserver.network.serverpackets.SystemMessage;
import com.l2jmobius.gameserver.network.telnet.TelnetServer;
import com.l2jmobius.gameserver.util.Broadcast;

/**
 * This class provides the functions for shutting down and restarting the server.<br>
 * It closes all open client connections and saves all data.
 * @version $Revision: 1.2.4.5 $ $Date: 2005/03/27 15:29:09 $
 */
public class Shutdown extends Thread
{
	private static final Logger LOGGER = Logger.getLogger(Shutdown.class.getName());
	private static Shutdown _counterInstance = null;
	
	private int _secondsShut;
	private int _shutdownMode;
	public static final int SIGTERM = 0;
	public static final int GM_SHUTDOWN = 1;
	public static final int GM_RESTART = 2;
	public static final int ABORT = 3;
	private static final String[] MODE_TEXT =
	{
		"SIGTERM",
		"shutting down",
		"restarting",
		"aborting"
	};
	
	/**
	 * This function starts a shutdown count down from Telnet (Copied from Function startShutdown())
	 * @param seconds seconds until shutdown
	 */
	private void SendServerQuit(int seconds)
	{
		final SystemMessage sysm = SystemMessage.getSystemMessage(SystemMessageId.THE_SERVER_WILL_BE_COMING_DOWN_IN_S1_SECOND_S_PLEASE_FIND_A_SAFE_PLACE_TO_LOG_OUT);
		sysm.addInt(seconds);
		Broadcast.toAllOnlinePlayers(sysm);
	}
	
	public void startTelnetShutdown(String IP, int seconds, boolean restart)
	{
		LOGGER.warning("IP: " + IP + " issued shutdown command. " + MODE_TEXT[_shutdownMode] + " in " + seconds + " seconds!");
		
		_shutdownMode = restart ? GM_RESTART : GM_SHUTDOWN;
		
		if (_shutdownMode > 0)
		{
			switch (seconds)
			{
				case 540:
				case 480:
				case 420:
				case 360:
				case 300:
				case 240:
				case 180:
				case 120:
				case 60:
				case 30:
				case 10:
				case 5:
				case 4:
				case 3:
				case 2:
				case 1:
				{
					break;
				}
				default:
				{
					SendServerQuit(seconds);
				}
			}
		}
		
		if (_counterInstance != null)
		{
			_counterInstance._abort();
		}
		_counterInstance = new Shutdown(seconds, restart);
		_counterInstance.start();
	}
	
	/**
	 * This function aborts a running countdown
	 * @param IP IP Which Issued shutdown command
	 */
	public void telnetAbort(String IP)
	{
		LOGGER.warning("IP: " + IP + " issued shutdown ABORT. " + MODE_TEXT[_shutdownMode] + " has been stopped!");
		
		if (_counterInstance != null)
		{
			_counterInstance._abort();
			Broadcast.toAllOnlinePlayers("Server aborts " + MODE_TEXT[_shutdownMode] + " and continues normal operation!", false);
		}
	}
	
	/**
	 * Default constructor is only used internal to create the shutdown-hook instance
	 */
	protected Shutdown()
	{
		_secondsShut = -1;
		_shutdownMode = SIGTERM;
	}
	
	/**
	 * This creates a countdown instance of Shutdown.
	 * @param seconds how many seconds until shutdown
	 * @param restart true is the server shall restart after shutdown
	 */
	public Shutdown(int seconds, boolean restart)
	{
		if (seconds < 0)
		{
			seconds = 0;
		}
		_secondsShut = seconds;
		_shutdownMode = restart ? GM_RESTART : GM_SHUTDOWN;
	}
	
	/**
	 * This function is called, when a new thread starts if this thread is the thread of getInstance, then this is the shutdown hook and we save all data and disconnect all clients.<br>
	 * After this thread ends, the server will completely exit if this is not the thread of getInstance, then this is a countdown thread.<br>
	 * We start the countdown, and when we finished it, and it was not aborted, we tell the shutdown-hook why we call exit, and then call exit when the exit status of the server is 1, startServer.sh / startServer.bat will restart the server.
	 */
	@Override
	public void run()
	{
		if (this == getInstance())
		{
			final TimeCounter tc = new TimeCounter();
			final TimeCounter tc1 = new TimeCounter();
			
			try
			{
				if ((Config.OFFLINE_TRADE_ENABLE || Config.OFFLINE_CRAFT_ENABLE) && Config.RESTORE_OFFLINERS && !Config.STORE_OFFLINE_TRADE_IN_REALTIME)
				{
					OfflineTradersTable.getInstance().storeOffliners();
					LOGGER.info("Offline Traders Table: Offline shops stored(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
				}
			}
			catch (Throwable t)
			{
				LOGGER.log(Level.WARNING, "Error saving offline shops.", t);
			}
			
			try
			{
				disconnectAllCharacters();
				LOGGER.info("All players disconnected and saved(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
			}
			catch (Throwable t)
			{
				// ignore
			}
			
			// ensure all services are stopped
			try
			{
				GameTimeController.getInstance().stopTimer();
				LOGGER.info("Game Time Controller: Timer stopped(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
			}
			catch (Throwable t)
			{
				// ignore
			}
			
			// stop all thread pools
			try
			{
				ThreadPoolManager.shutdown();
				LOGGER.info("Thread Pool Manager: Manager has been shut down(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
			}
			catch (Throwable t)
			{
				// ignore
			}
			
			try
			{
				LoginServerThread.getInstance().interrupt();
				LOGGER.info("Login Server Thread: Thread interruped(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
			}
			catch (Throwable t)
			{
				// ignore
			}
			
			try
			{
				TelnetServer.getInstance().shutdown();
				LOGGER.info("Telnet Server Thread: Thread interruped(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
			}
			catch (Throwable t)
			{
				// ignore
			}
			
			// last byebye, save all data and quit this server
			saveData();
			tc.restartCounter();
			
			// saveData sends messages to exit players, so shutdown selector after it
			try
			{
				ClientNetworkManager.getInstance().stop();
				EventLoopGroupManager.getInstance().shutdown();
				LOGGER.info("Game Server: Selector thread has been shut down(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
			}
			catch (Throwable t)
			{
				// ignore
			}
			
			// commit data, last chance
			try
			{
				DatabaseFactory.getInstance().close();
				LOGGER.info("L2Database Factory: Database connection has been shut down(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
			}
			catch (Throwable t)
			{
				
			}
			
			// server will quit, when this function ends.
			if (getInstance()._shutdownMode == GM_RESTART)
			{
				Runtime.getRuntime().halt(2);
			}
			else
			{
				Runtime.getRuntime().halt(0);
			}
			
			LOGGER.info("The server has been successfully shut down in " + (tc1.getEstimatedTime() / 1000) + "seconds.");
		}
		else
		{
			// gm shutdown: send warnings and then call exit to start shutdown sequence
			countdown();
			// last point where logging is operational :(
			LOGGER.warning("GM shutdown countdown is over. " + MODE_TEXT[_shutdownMode] + " NOW!");
			switch (_shutdownMode)
			{
				case GM_SHUTDOWN:
				{
					getInstance().setMode(GM_SHUTDOWN);
					System.exit(0);
					break;
				}
				case GM_RESTART:
				{
					getInstance().setMode(GM_RESTART);
					System.exit(2);
					break;
				}
				case ABORT:
				{
					LoginServerThread.getInstance().setServerStatus(ServerStatus.STATUS_AUTO);
					break;
				}
			}
		}
	}
	
	/**
	 * This functions starts a shutdown countdown.
	 * @param activeChar GM who issued the shutdown command
	 * @param seconds seconds until shutdown
	 * @param restart true if the server will restart after shutdown
	 */
	public void startShutdown(L2PcInstance activeChar, int seconds, boolean restart)
	{
		_shutdownMode = restart ? GM_RESTART : GM_SHUTDOWN;
		
		if (activeChar != null)
		{
			LOGGER.warning("GM: " + activeChar.getName() + "(" + activeChar.getObjectId() + ") issued shutdown command. " + MODE_TEXT[_shutdownMode] + " in " + seconds + " seconds!");
		}
		else
		{
			LOGGER.warning("Server scheduled restart issued shutdown command. Restart in " + seconds + " seconds!");
		}
		
		if (_shutdownMode > 0)
		{
			switch (seconds)
			{
				case 540:
				case 480:
				case 420:
				case 360:
				case 300:
				case 240:
				case 180:
				case 120:
				case 60:
				case 30:
				case 10:
				case 5:
				case 4:
				case 3:
				case 2:
				case 1:
				{
					break;
				}
				default:
				{
					SendServerQuit(seconds);
				}
			}
		}
		
		if (_counterInstance != null)
		{
			_counterInstance._abort();
		}
		
		// the main instance should only run for shutdown hook, so we start a new instance
		_counterInstance = new Shutdown(seconds, restart);
		_counterInstance.start();
	}
	
	/**
	 * This function aborts a running countdown.
	 * @param activeChar GM who issued the abort command
	 */
	public void abort(L2PcInstance activeChar)
	{
		LOGGER.warning("GM: " + activeChar.getName() + "(" + activeChar.getObjectId() + ") issued shutdown ABORT. " + MODE_TEXT[_shutdownMode] + " has been stopped!");
		if (_counterInstance != null)
		{
			_counterInstance._abort();
			Broadcast.toAllOnlinePlayers("Server aborts " + MODE_TEXT[_shutdownMode] + " and continues normal operation!", false);
		}
	}
	
	/**
	 * Set the shutdown mode.
	 * @param mode what mode shall be set
	 */
	private void setMode(int mode)
	{
		_shutdownMode = mode;
	}
	
	/**
	 * Set shutdown mode to ABORT.
	 */
	private void _abort()
	{
		_shutdownMode = ABORT;
	}
	
	/**
	 * This counts the countdown and reports it to all players countdown is aborted if mode changes to ABORT.
	 */
	private void countdown()
	{
		try
		{
			while (_secondsShut > 0)
			{
				switch (_secondsShut)
				{
					case 540:
					{
						SendServerQuit(540);
						break;
					}
					case 480:
					{
						SendServerQuit(480);
						break;
					}
					case 420:
					{
						SendServerQuit(420);
						break;
					}
					case 360:
					{
						SendServerQuit(360);
						break;
					}
					case 300:
					{
						SendServerQuit(300);
						break;
					}
					case 240:
					{
						SendServerQuit(240);
						break;
					}
					case 180:
					{
						SendServerQuit(180);
						break;
					}
					case 120:
					{
						SendServerQuit(120);
						break;
					}
					case 60:
					{
						LoginServerThread.getInstance().setServerStatus(ServerStatus.STATUS_DOWN); // avoids new players from logging in
						SendServerQuit(60);
						break;
					}
					case 30:
					{
						SendServerQuit(30);
						break;
					}
					case 10:
					{
						SendServerQuit(10);
						break;
					}
					case 5:
					{
						SendServerQuit(5);
						break;
					}
					case 4:
					{
						SendServerQuit(4);
						break;
					}
					case 3:
					{
						SendServerQuit(3);
						break;
					}
					case 2:
					{
						SendServerQuit(2);
						break;
					}
					case 1:
					{
						SendServerQuit(1);
						break;
					}
				}
				
				_secondsShut--;
				
				final int delay = 1000; // milliseconds
				Thread.sleep(delay);
				
				if (_shutdownMode == ABORT)
				{
					break;
				}
			}
		}
		catch (InterruptedException e)
		{
			// this will never happen
		}
	}
	
	/**
	 * This sends a last byebye, disconnects all players and saves data.
	 */
	private void saveData()
	{
		switch (_shutdownMode)
		{
			case SIGTERM:
			{
				LOGGER.info("SIGTERM received. Shutting down NOW!");
				break;
			}
			case GM_SHUTDOWN:
			{
				LOGGER.info("GM shutdown received. Shutting down NOW!");
				break;
			}
			case GM_RESTART:
			{
				LOGGER.info("GM restart received. Restarting NOW!");
				break;
			}
		}
		
		/*
		 * if (Config.ACTIVATE_POSITION_RECORDER) Universe.getInstance().implode(true);
		 */
		final TimeCounter tc = new TimeCounter();
		
		// Save all raidboss and GrandBoss status ^_^
		DBSpawnManager.getInstance().cleanUp();
		LOGGER.info("RaidBossSpawnManager: All raidboss info saved(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
		GrandBossManager.getInstance().cleanUp();
		LOGGER.info("GrandBossManager: All Grand Boss info saved(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
		ItemAuctionManager.getInstance().shutdown();
		LOGGER.info("Item Auction Manager: All tasks stopped(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
		Olympiad.getInstance().saveOlympiadStatus();
		LOGGER.info("Olympiad System: Data saved(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
		CeremonyOfChaosManager.getInstance().stopScheduler();
		LOGGER.info("CeremonyOfChaosManager: Scheduler stopped(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
		
		Hero.getInstance().shutdown();
		LOGGER.info("Hero System: Data saved(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
		ClanTable.getInstance().shutdown();
		LOGGER.info("Clan System: Data saved(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
		
		// Save Cursed Weapons data before closing.
		CursedWeaponsManager.getInstance().saveData();
		LOGGER.info("Cursed Weapons Manager: Data saved(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
		
		// Save all manor data
		if (!Config.ALT_MANOR_SAVE_ALL_ACTIONS)
		{
			CastleManorManager.getInstance().storeMe();
			LOGGER.info("Castle Manor Manager: Data saved(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
		}
		
		// Save all global (non-player specific) Quest data that needs to persist after reboot
		QuestManager.getInstance().save();
		LOGGER.info("Quest Manager: Data saved(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
		
		// Save all global variables data
		GlobalVariablesManager.getInstance().storeMe();
		LOGGER.info("Global Variables Manager: Variables saved(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
		
		// Save items on ground before closing
		if (Config.SAVE_DROPPED_ITEM)
		{
			ItemsOnGroundManager.getInstance().saveInDb();
			LOGGER.info("Items On Ground Manager: Data saved(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
			ItemsOnGroundManager.getInstance().cleanUp();
			LOGGER.info("Items On Ground Manager: Cleaned up(" + tc.getEstimatedTimeAndRestartCounter() + "ms).");
		}
		
		// Save bot reports to database
		if (Config.BOTREPORT_ENABLE)
		{
			BotReportTable.getInstance().saveReportedCharData();
			LOGGER.info("Bot Report Table: Sucessfully saved reports to database!");
		}
		
		try
		{
			Thread.sleep(5000);
		}
		catch (InterruptedException e)
		{
			// never happens :p
		}
	}
	
	/**
	 * This disconnects all clients from the server.
	 */
	private void disconnectAllCharacters()
	{
		for (L2PcInstance player : L2World.getInstance().getPlayers())
		{
			// Logout Character
			try
			{
				final L2GameClient client = player.getClient();
				if ((client != null) && !client.isDetached())
				{
					client.close(ServerClose.STATIC_PACKET);
					client.setActiveChar(null);
					player.setClient(null);
				}
				else if ((client == null) || client.isDetached())
				// player is probably a bot - force logout
				{
					player.logout();
				}
				player.deleteMe();
			}
			catch (Throwable t)
			{
				LOGGER.log(Level.WARNING, "Failed logour char " + player, t);
			}
		}
	}
	
	/**
	 * A simple class used to track down the estimated time of method executions.<br>
	 * Once this class is created, it saves the start time, and when you want to get the estimated time, use the getEstimatedTime() method.
	 */
	private static final class TimeCounter
	{
		private long _startTime;
		
		protected TimeCounter()
		{
			restartCounter();
		}
		
		protected void restartCounter()
		{
			_startTime = System.currentTimeMillis();
		}
		
		protected long getEstimatedTimeAndRestartCounter()
		{
			final long toReturn = System.currentTimeMillis() - _startTime;
			restartCounter();
			return toReturn;
		}
		
		protected long getEstimatedTime()
		{
			return System.currentTimeMillis() - _startTime;
		}
	}
	
	/**
	 * Get the shutdown-hook instance the shutdown-hook instance is created by the first call of this function, but it has to be registered externally.<br>
	 * @return instance of Shutdown, to be used as shutdown hook
	 */
	public static Shutdown getInstance()
	{
		return SingletonHolder._instance;
	}
	
	private static class SingletonHolder
	{
		protected static final Shutdown _instance = new Shutdown();
	}
}