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.arakne.utils.maps.CoordinateCell;

import fr.arakne.utils.maps.constant.Direction;

import fr.arakne.utils.maps.path.Decoder;

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

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

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

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

import fr.quatrevieux.araknemu.game.fight.map.FightCell;

/**

 * Move the adjacent fighter to the target cell

 *

 * - Get the direction between caster and target cell

 * - Get the adjacent fighter for the given direction

 * - Compute the distance between the target fighter and the target cell

 * - Perform a move back on the target fighter with the computed distance

 */

public final class MoveToTargetCellHandler implements EffectHandler {

    private final Decoder<FightCell> decoder;

    private final MoveBackApplier applier;

    public MoveToTargetCellHandler(Fight fight) {

        this.decoder = new Decoder<>(fight.map());

        this.applier = new MoveBackApplier(fight);

    }

    @Override

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

        final ActiveFighter caster = cast.caster();

        final CoordinateCell<FightCell> casterCell = caster.cell().coordinate();

        // Remove 1 because the distance should be computed from the target fighter cell

        final int distance = casterCell.distance(cast.target()) - 1;

        final Direction direction = casterCell.directionTo(cast.target());

        decoder.nextCellByDirection(casterCell.cell(), direction)

            .flatMap(FightCell::fighter)

            .ifPresent(target -> applier.apply(caster, target, distance))

        ;

    }

}