/*
 * Copyright © 2004-2021 L2J Server
 *
 * This file is part of L2J Server.
 *
 * L2J Server 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.
 *
 * L2J Server 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.l2jserver.gameserver.model.drops.strategy;

import static com.l2jserver.gameserver.config.Configuration.npc;

import com.l2jserver.gameserver.model.actor.L2Character;
import com.l2jserver.gameserver.model.drops.GeneralDropItem;
import com.l2jserver.gameserver.model.drops.IDropItem;
import com.l2jserver.gameserver.model.itemcontainer.Inventory;
import com.l2jserver.gameserver.util.Util;

/**
 * @author Battlecruiser
 */
public interface IKillerChanceModifierStrategy extends INonGroupedKillerChanceModifierStrategy {
	IKillerChanceModifierStrategy DEFAULT_STRATEGY = (item, victim, killer) -> {
		int levelDifference = victim.getLevel() - killer.getLevel();
		if ((victim.isRaid()) && npc().useDeepBlueDropRulesRaid()) {
			// FIXME: Config?
			return Math.max(0, Math.min(1, (levelDifference * 0.15) + 1));
		} else if (npc().useDeepBlueDropRules()) {
			
			return Util.map(levelDifference, -npc().getDropItemMaxLevelDifference(), -npc().getDropItemMinLevelDifference(), npc().getDropItemMinLevelGapChance(), 100.0) / 100;
		}
		return 1;
	};
	INonGroupedKillerChanceModifierStrategy DEFAULT_NONGROUP_STRATEGY = (item, victim, killer) -> {
		if (((!(victim.isRaid())) && npc().useDeepBlueDropRules()) || ((victim.isRaid()) && npc().useDeepBlueDropRulesRaid())) {
			int levelDifference = victim.getLevel() - killer.getLevel();
			if (item.getItemId() == Inventory.ADENA_ID) {
				return Util.map(levelDifference, -npc().getDropAdenaMaxLevelDifference(), -npc().getDropAdenaMinLevelDifference(), npc().getDropAdenaMinLevelGapChance(), 100.0) / 100;
			}
			return Util.map(levelDifference, -npc().getDropItemMaxLevelDifference(), -npc().getDropItemMinLevelDifference(), npc().getDropItemMinLevelGapChance(), 100.0) / 100;
		}
		return 1;
	};
	
	IKillerChanceModifierStrategy NO_RULES = (item, victim, killer) -> 1;
	
	double getKillerChanceModifier(IDropItem item, L2Character victim, L2Character killer);
	
	@Override
	default double getKillerChanceModifier(GeneralDropItem item, L2Character victim, L2Character killer) {
		return getKillerChanceModifier((IDropItem) item, victim, killer);
	}
}
