/*
 * This file is part of aion-unique <aion-unique.org>.
 *
 * aion-unique 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.
 *
 * aion-unique 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 aion-unique.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.aionemu.gameserver.questEngine.handlers;

import java.lang.reflect.Modifier;

import org.apache.log4j.Logger;

import com.aionemu.commons.scripting.classlistener.ClassListener;
import com.aionemu.commons.scripting.classlistener.DefaultClassListener;
import com.aionemu.commons.utils.ClassUtils;
import com.aionemu.gameserver.questEngine.QuestEngine;
import com.google.inject.Injector;

/**
 * @author MrPoke
 *
 */
public class QuestHandlerLoader extends DefaultClassListener implements ClassListener
{
	private static final Logger logger = Logger.getLogger(QuestHandlerLoader.class);

	private Injector injector;

	public QuestHandlerLoader(Injector injector)
	{
		this.injector = injector;
	}

	@Override
	public void postLoad(Class<?>[] classes)
	{
		for (Class<?> c : classes)
		{
			if (logger.isDebugEnabled())
				logger.debug("Load class " + c.getName());

			if (!isValidClass(c))
				continue;

			if (ClassUtils.isSubclass(c, QuestHandler.class))
			{
				injector.getInstance(QuestEngine.class).addQuestHandler((QuestHandler)injector.getInstance(c));
			}
		}

		// call onClassLoad()
		super.postLoad(classes);

	}

	@Override
	public void preUnload(Class<?>[] classes)
	{
		if (logger.isDebugEnabled())
			for (Class<?> c : classes)// debug messages
				logger.debug("Unload class " + c.getName());

		// call onClassUnload()
		super.preUnload(classes);

		injector.getInstance(QuestEngine.class).clear();
	}

	public boolean isValidClass(Class<?> clazz)
	{
		final int modifiers = clazz.getModifiers();

		if (Modifier.isAbstract(modifiers) || Modifier.isInterface(modifiers))
			return false;

		if (!Modifier.isPublic(modifiers))
			return false;

		return true;
	}
}