/*
 * 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 l2.universe.gameserver.skills.effects;

import java.util.logging.Logger;

import l2.universe.Config;
import l2.universe.gameserver.model.L2Effect;
import l2.universe.gameserver.model.actor.L2Character;
import l2.universe.gameserver.model.actor.instance.L2PcInstance;
import l2.universe.gameserver.skills.Env;
import l2.universe.gameserver.skills.Formulas;
import l2.universe.gameserver.templates.effects.EffectTemplate;
import l2.universe.gameserver.templates.skills.L2EffectType;
import l2.universe.util.Rnd;
import l2.universe.util.StringUtil;

/**
 * 
 * @author DS
 *
 */
public class EffectCancel extends L2Effect
{
	protected static final Logger _log = Logger.getLogger(EffectCancel.class.getName());
	
	public EffectCancel(Env env, EffectTemplate template)
	{
		super(env, template);
	}
	
	@Override
	public L2EffectType getEffectType()
	{
		return L2EffectType.CANCEL;
	}
	
	@Override
	public boolean onStart()
	{
		return cancel(getEffector(), getEffected(), this);
	}
	
	@Override
	public boolean onActionTime()
	{
		return false;
	}
	
	private static boolean cancel(L2Character caster, L2Character target, L2Effect effect)
	{
		if (!(target instanceof L2PcInstance)|| target.isDead())
			return false;
		
		final int cancelLvl = effect.getSkill().getMagicLevel();
		int count = effect.getSkill().getMaxNegatedEffects();
		
		double rate = effect.getEffectPower();
		final double vulnModifier = Formulas.calcSkillTypeVulnerability(0, target, effect.getSkillType());
		final double profModifier = Formulas.calcSkillTypeProficiency(0, caster, target, effect.getSkillType());
		double res = vulnModifier + profModifier;
		double resMod = 1;
		if (res != 0)
		{
			if (res < 0)
			{
				resMod = 1 - 0.075 * res;
				resMod = 1 / resMod;
			}
			else
				resMod = 1 + 0.02 * res;
			
			rate *= resMod;
		}

		if (caster.isDebug())
		{
			final StringBuilder stat = new StringBuilder(100);
			StringUtil.append(stat,
					effect.getSkill().getName(),
					" power:", String.valueOf((int)effect.getEffectPower()),
					" lvl:", String.valueOf(cancelLvl),
					" res:", String.format("%1.2f", resMod), "(",
					String.format("%1.2f", profModifier), "/",
					String.format("%1.2f", vulnModifier),
					") total:", String.valueOf(rate)
			);
			final String result = stat.toString();
			if (caster.isDebug())
				caster.sendDebugMessage(result);
			if (Config.DEVELOPER)
				_log.info(result);
		}

		L2Effect eff;
		int lastCanceledSkillId = 0;
		final L2Effect[] effects = target.getAllEffects();
		for (int i = effects.length; --i >= 0;)
		{
			eff = effects[i];
			if (eff == null)
				continue;
			
			if (!eff.canBeStolen())
			{
				effects[i] = null;
				continue;
			}
			
			// first pass - dances/songs only
			if (!eff.getSkill().isDance())
				continue;
			
			if (eff.getSkill().getId() == lastCanceledSkillId)
			{
				eff.exit(); // this skill already canceled
				continue;
			}
			
			if (!calcCancelSuccess(eff, cancelLvl, (int)rate))
				continue;
			
			lastCanceledSkillId = eff.getSkill().getId();
			eff.exit();
			count--;
			
			if (count == 0)
				break;
		}
		
		if (count != 0)
		{
			lastCanceledSkillId = 0;
			for (int i = effects.length; --i >= 0;)
			{
				eff = effects[i];
				if (eff == null)
					continue;
				
				// second pass - all except dances/songs
				if (eff.getSkill().isDance())
					continue;
				
				if (eff.getSkill().getId() == lastCanceledSkillId)
				{
					eff.exit(); // this skill already canceled
					continue;
				}
				
				if (!calcCancelSuccess(eff, cancelLvl, (int)rate))
					continue;
				
				lastCanceledSkillId = eff.getSkill().getId();
				eff.exit();
				count--;
				
				if (count == 0)
					break;
			}
		}
		return true;
	}
	
	private static boolean calcCancelSuccess(L2Effect effect, int cancelLvl, int baseRate)
	{
		int rate = 2 * (cancelLvl - effect.getSkill().getMagicLevel());
		rate += effect.getPeriod()/120;
		rate += baseRate;
		
		if (rate < 25)
			rate = 25;
		else if (rate > 75)
			rate = 75;
		
		return Rnd.get(100) < rate;
	}
}