Arakne / Araknemu

 * 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.shifting;

import fr.quatrevieux.araknemu.game.fight.Fight;

import fr.quatrevieux.araknemu.game.fight.castable.CastScope;

import fr.quatrevieux.araknemu.game.fight.castable.effect.EffectsUtils;

import fr.quatrevieux.araknemu.game.fight.castable.effect.buff.Buff;

import fr.quatrevieux.araknemu.game.fight.castable.effect.buff.BuffHook;

import fr.quatrevieux.araknemu.game.fight.castable.effect.handler.EffectHandler;

import fr.quatrevieux.araknemu.game.fight.fighter.ActiveFighter;

import fr.quatrevieux.araknemu.game.fight.fighter.PassiveFighter;

/**

 * Buff effect for switch position between buff caster and target when the target will take damage

 * This effect will also replace the cast target

 *

 * @see CastScope#replaceTarget(PassiveFighter, PassiveFighter)

 */

public final class SwitchPositionOnAttackHandler implements EffectHandler, BuffHook {

    private final SwitchPositionApplier applier;

    public SwitchPositionOnAttackHandler(Fight fight) {

        this.applier = new SwitchPositionApplier(fight);

    }

    @Override

    public void buff(CastScope cast, CastScope.EffectScope effect) {

        final ActiveFighter caster = cast.caster();

        for (PassiveFighter target : effect.targets()) {

            if (!target.equals(caster)) {

                target.buffs().add(new Buff(effect.effect(), cast.action(), caster, target, this));

            }

        }

    }

    @Override

    public boolean onCastTarget(Buff buff, CastScope cast) {

        if (!isDamageCast(cast)) {

            return true;

        }

        final ActiveFighter buffCaster = buff.caster();

        final PassiveFighter target = buff.target();

        applier.apply(buffCaster, target);

        cast.replaceTarget(target, buffCaster);

        return false;

    }

    /**

     * Check if the action is direct damage attack

     *

     * @param cast The action to check

     *

     * @return true if the cast can be dodged

     */

    private boolean isDamageCast(CastScope cast) {

        return cast.effects().stream()

            .map(CastScope.EffectScope::effect)

            // Should return only direct damage effects

            .anyMatch(effect -> EffectsUtils.isDamageEffect(effect.effect()) && effect.duration() == 0)

        ;

    }

}