/*
 * 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 silentium.gameserver.taskmanager;

import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.NoSuchElementException;

import javolution.util.FastMap;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import silentium.gameserver.ThreadPoolManager;
import silentium.gameserver.model.actor.L2Attackable;
import silentium.gameserver.model.actor.L2Character;

/**
 * @author la2 Lets drink to code!
 */
public class DecayTaskManager
{
	protected static final Logger _log = LoggerFactory.getLogger(DecayTaskManager.class.getName());
	protected Map<L2Character, Long> _decayTasks = new FastMap<L2Character, Long>().shared();

	public static final int DEFAULT_DECAY_TIME = 7000;

	public DecayTaskManager()
	{
		ThreadPoolManager.getInstance().scheduleAiAtFixedRate(new DecayScheduler(), 10000, 5000);
	}

	public static DecayTaskManager getInstance()
	{
		return SingletonHolder._instance;
	}

	public void addDecayTask(L2Character actor)
	{
		_decayTasks.put(actor, System.currentTimeMillis());
	}

	public void addDecayTask(L2Character actor, int interval)
	{
		_decayTasks.put(actor, System.currentTimeMillis() + interval);
	}

	public void cancelDecayTask(L2Character actor)
	{
		try
		{
			_decayTasks.remove(actor);
		}
		catch (NoSuchElementException e)
		{
		}
	}

	private class DecayScheduler implements Runnable
	{
		protected DecayScheduler()
		{
			// Do nothing
		}

		@Override
		public void run()
		{
			long current = System.currentTimeMillis();
			int delay;
			try
			{
				Iterator<Entry<L2Character, Long>> it = _decayTasks.entrySet().iterator();
				while (it.hasNext())
				{
					Entry<L2Character, Long> e = it.next();
					L2Character actor = e.getKey();
					Long next = e.getValue();
					if (next == null)
						continue;

					if (actor instanceof L2Attackable)
					{
						delay = ((L2Attackable) actor).getCorpseDecayTime();
						if (((L2Attackable) actor).isSpoil() || ((L2Attackable) actor).isSeeded())
							delay *= 2;
					}
					else
						delay = DEFAULT_DECAY_TIME;

					if ((current - next) > delay)
					{
						actor.onDecay();
						it.remove();
					}
				}
			}
			catch (Exception e)
			{
				// TODO: Find out the reason for exception. Unless caught here, mob decay would stop.
				_log.warn("Error in DecayScheduler: " + e.getMessage(), e);
			}
		}
	}

	@Override
	public String toString()
	{
		String ret = "============= DecayTask Manager Report ============\r\n";
		ret += "Tasks count: " + _decayTasks.size() + "\r\n";
		ret += "Tasks dump:\r\n";

		Long current = System.currentTimeMillis();
		for (L2Character actor : _decayTasks.keySet())
		{
			ret += "Class/Name: " + actor.getClass().getSimpleName() + "/" + actor.getName() + " decay timer: " + (current - _decayTasks.get(actor)) + "\r\n";
		}

		return ret;
	}

	/**
	 * <u><b><font color="FF0000">Read only.</font></b></u>
	 * 
	 * @return a Map containing all decay tasks.
	 */
	public Map<L2Character, Long> getTasks()
	{
		return _decayTasks;
	}

	private static class SingletonHolder
	{
		protected static final DecayTaskManager _instance = new DecayTaskManager();
	}
}