/*
 * This file is part of Araknemu.
 *
 * Araknemu is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Araknemu 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Araknemu.  If not, see <https://www.gnu.org/licenses/>.
 *
 * Copyright (c) 2017-2021 Vincent Quatrevieux
 */

package fr.quatrevieux.araknemu.game.fight.castable.effect.handler.damage;

import fr.quatrevieux.araknemu.game.fight.Fight;
import fr.quatrevieux.araknemu.game.fight.castable.FightCastScope;
import fr.quatrevieux.araknemu.game.fight.castable.effect.EffectValue;
import fr.quatrevieux.araknemu.game.fight.castable.effect.Element;
import fr.quatrevieux.araknemu.game.fight.castable.effect.handler.EffectHandler;
import fr.quatrevieux.araknemu.game.fight.fighter.Fighter;
import fr.quatrevieux.araknemu.game.spell.effect.SpellEffect;

/**
 * Handle damage based on the current caster life
 *
 * Compute damage in same way as {@link PercentLifeDamageHandler} in buff (i.e. poison) context
 * Damage cannot be boosted, but can be reduced using armor because it's related to an element
 *
 * Only indirect buffs are called
 */
public final class IndirectPercentLifeDamageHandler implements EffectHandler {
    private final DamageApplier applier;
    private final Fight fight;

    public IndirectPercentLifeDamageHandler(Element element, Fight fight) {
        this.applier = new DamageApplier(element, fight);
        this.fight = fight;
    }

    @Override
    public void handle(FightCastScope cast, FightCastScope.EffectScope effect) {
        final Fight fight = this.fight;
        final Fighter caster = cast.caster();
        final SpellEffect spellEffect = effect.effect();
        final EffectValue.Context context = EffectValue.preRoll(spellEffect, caster);
        final int currentLife = caster.life().current();

        // Do not use AbstractPreRollEffectHandler to ensure that current life is not changed
        // during the loop, so that damage are computed on the same life value
        for (Fighter target : effect.targets()) {
            if (!fight.active()) {
                break;
            }

            final int percent = context.forTarget(target).value();

            applier.applyIndirectFixed(caster, currentLife * percent / 100, target);
        }
    }

    @Override
    public void buff(FightCastScope cast, FightCastScope.EffectScope effect) {
        throw new UnsupportedOperationException("Indirect percent life damage cannot be used as buff");
    }
}
