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.fighter.Fighter;

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

import fr.quatrevieux.araknemu.network.game.out.fight.AddBuff;

import java.util.Collection;

import java.util.Iterator;

import java.util.LinkedList;

import java.util.function.Predicate;

import java.util.stream.Stream;

import java.util.stream.StreamSupport;

/**

 * Handle buff list for a fighter

 */

public final class BuffList implements Iterable<Buff>, Buffs {

    private final Fighter fighter;

    private final Collection<Buff> buffs = new LinkedList<>();

    public BuffList(Fighter fighter) {

        this.fighter = fighter;

    }

    @Override

    public Iterator<Buff> iterator() {

        return buffs.iterator();

    }

    /**

     * Get the Buff stream

     */

    public Stream<Buff> stream() {

        return StreamSupport.stream(spliterator(), false);

    }

    @Override

    public void add(Buff buff) {

        buffs.add(buff);

        buff.hook().onBuffStarted(buff);

        if (buff.remainingTurns() == 0) {

            buff.incrementRemainingTurns();

        }

        fighter.fight().send(new AddBuff(buff));

        // Add one turn on self-buff

        if (fighter.equals(buff.caster())) {

            buff.incrementRemainingTurns();

        }

    }

    @Override

    public boolean onStartTurn() {

        boolean result = true;

        for (Buff buff : buffs) {

            result &= buff.hook().onStartTurn(buff);

        }

        return result;

    }

    @Override

    public void onEndTurn() {

        for (Buff buff : buffs) {

            buff.hook().onEndTurn(buff);

        }

    }

    @Override

    public void onCastTarget(CastScope cast) {

        for (Buff buff : buffs) {

            buff.hook().onCastTarget(buff, cast);

        }

    }

    @Override

    public void onDamage(Damage value) {

        for (Buff buff : buffs) {

            buff.hook().onDamage(buff, value);

        }

    }

    }

    @Override

    public void refresh() {

        removeIf(buff -> {

            buff.decrementRemainingTurns();

            return !buff.valid();

        });

    }

    @Override

    public boolean removeAll() {

        return removeIf(Buff::canBeDispelled);

    }

    @Override

    public boolean removeByCaster(PassiveFighter caster) {

        return removeIf(buff -> buff.caster().equals(caster));

    }

    /**

     * Remove buff by a predicate

     *

     * @param predicate Takes the buff as parameter, and return true to delete (and terminate) the buff

     *

     * @return true if there is a change (i.e. a buff is terminated)

     */

    private boolean removeIf(Predicate<Buff> predicate) {

        final Iterator<Buff> iterator = buffs.iterator();

        boolean hasChanged = false;

        while (iterator.hasNext()) {

            final Buff buff = iterator.next();

            if (predicate.test(buff)) {

                iterator.remove();

                buff.hook().onBuffTerminated(buff);

                hasChanged = true;

            }

        }

        return hasChanged;

    }

}