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) 2017-2019 Vincent Quatrevieux

 */

package fr.quatrevieux.araknemu.game.fight.castable.effect.buff;

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

import fr.quatrevieux.araknemu.game.fight.castable.effect.handler.damage.Damage;

import fr.quatrevieux.araknemu.game.fight.castable.effect.handler.damage.ReflectedDamage;

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

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

/**

 * Hook action for apply buff effects

 */

public interface BuffHook {

    /**

     * Apply effect when fighter turn is started

     *

     * @return False if the fighter cannot start the turn

     */

    public default boolean onStartTurn(Buff buff) {

        return true;

    }

    /**

     * Apply effect on turn ending

     */

    public default void onEndTurn(Buff buff) {}

    /**

     * Start the buff

     */

    public default void onBuffStarted(Buff buff) {}

    /**

     * The buff is terminated (buff expired, debuff...)

     */

    public default void onBuffTerminated(Buff buff) {}

    /**

     * The fighter is a target of a cast

     *

     * To get the spell caster, use {@code cast.caster()}, and to get the target, use {@code buff.target()}.

     *

     * If the target is changed or removed, this method must return false.

     * Retuning false permit to notify that the spell targets has changed to ensure that new

     * target will also be taken in account, but also stop applying other "onCastTarget" hooks

     * on the current fighter.

     *

     * This method will be called on direct and indirect (like spell returned) targets.

     *

     * Implementation:

     * <pre>{@code

     * class MyEffectHandler implements EffectHandler, BuffHook {

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

     *         // ...

     *     }

     *

     *     // Add the buff to targets

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

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

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

     *         }

     *     }

     *

     *     // Implements the buff hook

     *     public void onCastTarget(Buff buff, CastScope cast) {

     *         if (!checkCast(cast)) {

     *             return true; // ignore the hook for this cast : return true to continue on this target

     *         }

     *

     *         // Apply buff effect...

     *         // ...

     *

     *         // Change the target

     *         // buff.target() is cast target / fighter who has the given buff applied

     *         cast.replaceTarget(buff.target(), getNewTarget(cast));

     *

     *         // You can also remove the current fighter from spell targets

     *         cast.removeTarget(buff.target());

     *

     *         return false; // The target has been changed (or removed)

     *     }

     * }

     * }</pre>

     *

     * @return true to continue, or false if the cast target has changed (removed or replaced)

     *

     * @see CastScope#removeTarget(PassiveFighter)

     * @see CastScope#replaceTarget(PassiveFighter, PassiveFighter)

     */

    public default boolean onCastTarget(Buff buff, CastScope cast) {

        return true;

    }

    /**

     * The fighter will take damages

     */

    public default void onDamage(Buff buff, Damage value) {}

    /**

     * The fighter will take damages

     */

    public default void onDirectDamage(Buff buff, ActiveFighter caster, Damage value) {

        onDamage(buff, value);

    }

    /**

     * The fighter will take damages by a buff (i.e. poison)

     *

     * @param buff The current buff

     * @param poison The poison buff

     * @param value The damage to apply

     */

    public default void onBuffDamage(Buff buff, Buff poison, Damage value) {

        onDamage(buff, value);

    }

    /**

     * The fighter life has been altered

     *

     * Unlike {@link BuffHook#onDamage(Buff, Damage)}, the effects has already been applied

     *

     * @param buff The active buff

     * @param value Altered life value. Negative for a damage, positive for a heal

     *

     * @see fr.quatrevieux.araknemu.game.fight.fighter.FighterLife#alter(fr.quatrevieux.araknemu.game.fight.fighter.PassiveFighter, int)

     */

    public default void onLifeAltered(Buff buff, int value) {}

    /**

     * Damage has been reflected by the cast target

     *

     * The target can be changed using {@link ReflectedDamage#changeTarget(PassiveFighter)}

     * Or modified using {@link ReflectedDamage#multiply(int)}

     *

     * @param buff The active buff

     * @param damage The reflected damage

     */