/*
 * 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 handlers.targethandlers;

import java.util.Collection;
import java.util.List;

import javolution.util.FastList;

import com.l2jserver.gameserver.handler.ITargetTypeHandler;
import com.l2jserver.gameserver.model.L2Object;
import com.l2jserver.gameserver.model.actor.L2Attackable;
import com.l2jserver.gameserver.model.actor.L2Character;
import com.l2jserver.gameserver.model.actor.L2Playable;
import com.l2jserver.gameserver.model.skills.L2Skill;
import com.l2jserver.gameserver.model.skills.targets.L2TargetType;
import com.l2jserver.gameserver.network.SystemMessageId;
import com.l2jserver.gameserver.util.Util;

/**
 * @author UnAfraid
 */
public class TargetBehindArea implements ITargetTypeHandler
{
	@Override
	public L2Object[] getTargetList(L2Skill skill, L2Character activeChar, boolean onlyFirst, L2Character target)
	{
		List<L2Character> targetList = new FastList<L2Character>();
		if (((target == null || target == activeChar || target.isAlikeDead()) && skill.getCastRange() >= 0) || (!(target instanceof L2Attackable || target instanceof L2Playable)))
		{
			activeChar.sendPacket(SystemMessageId.TARGET_IS_INCORRECT);
			return _emptyTargetList;
		}
		
		final L2Character origin;
		final boolean srcInArena = (activeChar.isInsideZone(L2Character.ZONE_PVP) && !activeChar.isInsideZone(L2Character.ZONE_SIEGE));
		final int radius = skill.getSkillRadius();
		
		if (skill.getCastRange() >= 0)
		{
			if (!L2Skill.checkForAreaOffensiveSkills(activeChar, target, skill, srcInArena))
				return _emptyTargetList;
			
			if (onlyFirst)
				return new L2Character[] { target };
			
			origin = target;
			targetList.add(origin); // Add target to target list
		}
		else
			origin = activeChar;
		
		final Collection<L2Character> objs = activeChar.getKnownList().getKnownCharacters();
		for (L2Character obj : objs)
		{
			if (!(obj instanceof L2Attackable || obj instanceof L2Playable))
				continue;
			
			if (obj == origin)
				continue;
			
			if (Util.checkIfInRange(radius, origin, obj, true))
			{
				if (!obj.isBehind(activeChar))
					continue;
				
				if (!L2Skill.checkForAreaOffensiveSkills(activeChar, obj, skill, srcInArena))
					continue;
				
				if (skill.getMaxTargets() > -1 && targetList.size() >= skill.getMaxTargets())
					break;
				
				targetList.add(obj);
			}
		}
		
		if (targetList.isEmpty())
			return _emptyTargetList;
		
		return targetList.toArray(new L2Character[targetList.size()]);
	}
	
	@Override
	public Enum<L2TargetType> getTargetType()
	{
		return L2TargetType.TARGET_BEHIND_AREA;
	}
}
