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.ai.action.builder;

import fr.quatrevieux.araknemu.game.fight.ai.AI;

import fr.quatrevieux.araknemu.game.fight.ai.action.ActionGenerator;

import fr.quatrevieux.araknemu.game.fight.ai.action.Attack;

import fr.quatrevieux.araknemu.game.fight.ai.action.Boost;

import fr.quatrevieux.araknemu.game.fight.ai.action.Debuff;

import fr.quatrevieux.araknemu.game.fight.ai.action.Heal;

import fr.quatrevieux.araknemu.game.fight.ai.action.MoveFarEnemies;

import fr.quatrevieux.araknemu.game.fight.ai.action.MoveNearAllies;

import fr.quatrevieux.araknemu.game.fight.ai.action.MoveNearEnemy;

import fr.quatrevieux.araknemu.game.fight.ai.action.MoveToAttack;

import fr.quatrevieux.araknemu.game.fight.ai.action.MoveToBoost;

import fr.quatrevieux.araknemu.game.fight.ai.action.TeleportNearEnemy;

import fr.quatrevieux.araknemu.game.fight.ai.action.logic.GeneratorAggregate;

import fr.quatrevieux.araknemu.game.fight.ai.action.logic.NullGenerator;

import fr.quatrevieux.araknemu.game.fight.ai.simulation.Simulator;

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

import java.util.ArrayList;

import java.util.List;

import java.util.function.Consumer;

import java.util.function.Predicate;

/**

 * Build an action generator pipeline using a simple builder

 *

 * Note: This class is not marked as final to allow extends to add custom actions methods

 *

 * Usage:

 * <pre>{@code

 * Simulator simulator = xxx;

 * GeneratorBuilder builder = new GeneratorBuilder();

 *

 * builder

 *     .boostSelf(simulator)

 *     .attackFromBestCell(simulator)

 *     .when(ai -> isLowLife(ai), cb -> cb

 *         .success(GeneratorBuilder::moveFarEnemies)

 *         .otherwise(GeneratorBuilder::moveNearEnemy)

 *     )

 *     .boostAllies(simulator)

 * ;

 * }</pre>

 */

public class GeneratorBuilder<F extends ActiveFighter> {

    private final List<ActionGenerator<F>> generators = new ArrayList<>();

    /**

     * Append a new action generator at the end of the pipeline

     *

     * Note: prefer use of helpers methods instead

     *

     * Usage:

     * <pre>{@code

     * builder

     *     .add(new MyProprietaryAction())

     *     .add(new NextAction())

     * ;

     * }</pre>

     *

     * @param generator The generator instance

     *

     * @return The builder instance

     */

    public final GeneratorBuilder<F> add(ActionGenerator<F> generator) {

        generators.add(generator);

        return this;

    }

    /**

     * Add a conditional action

     *

     * Usage:

     * <pre>{code

     * builder.when(ai -> checkCanPerform(ai), cb -> cb

     *     .success(GeneratorBuilder::attack)

     *     .otherwise(GeneratorBuilder::boostSelf)

     * )

     * }</pre>

     *

     * @param configurator The builder configurator

     *

     * @return The builder instance

     *

     * @see fr.quatrevieux.araknemu.game.fight.ai.util.Predicates For the condition parameter

     * @see ConditionalBuilder

     * @see fr.quatrevieux.araknemu.game.fight.ai.action.logic.ConditionalGenerator

     */

    public final GeneratorBuilder<F> when(Predicate<AI<F>> condition, Consumer<ConditionalBuilder<F>> configurator) {

        final ConditionalBuilder<F> builder = new ConditionalBuilder<>(condition);

        configurator.accept(builder);

        return add(builder.build());

    }

    /**

     * Try to attack from the best cell (i.e. move to maximize damages)

     *

     * Try to perform in order :

     * - Move to the best cell for cast attack

     * - Cast the attack spell

     *

     * Note: this method is equivalent to `{@code builder.moveToAttack(simulator).attack(simulator)}`

     *

     * @param simulator Simulator used by AI

     *

     * @return The builder instance

     *

     * @see GeneratorBuilder#attackFromNearestCell(Simulator) Same action (move and attack), but configured to use the minimal amount of MP

     * @see GeneratorBuilder#moveToAttack(Simulator) For only perform the move action, without attack

     * @see GeneratorBuilder#attack(Simulator) For only perform the attack, without move

     */

    public final GeneratorBuilder<F> attackFromBestCell(Simulator simulator) {

        return moveToAttack(simulator).attack(simulator);

    }

    /**

     * Try to move to the best cell for cast an attack spell

     *

     * To ensure that the move will be performed, add the attack action after this one.

     * Otherwise, if an attack is possible from the current cell it will be performed,

     * which will results to sub-optimal action.

     *

     * The action will not be performed if there is a tackle chance and if an attack is possible from the current cell

     *

     * @param simulator Simulator used by AI

     *

     * @return The builder instance

     *

     * @see GeneratorBuilder#attackFromBestCell(Simulator) For perform move and attack

     * @see MoveToAttack#bestTarget(Simulator) The used action generator

     */

    public final GeneratorBuilder<F> moveToAttack(Simulator simulator) {

        return add(MoveToAttack.bestTarget(simulator));

    }

    /**

     * Try to attack from the nearest cell

     *

     * Try to perform in order :

     * - Cast the attack spell

     * - Move to the nearest cell for cast attack

     *

     * If an attack can be performed from the current cell, the move will be ignored

     *

     * Note: this method is equivalent to `{@code builder.attack(simulator).add(MoveToAttack.nearest(simulator))}`

     *

     * @param simulator Simulator used by AI

     *

     * @return The builder instance

     *

     * @see GeneratorBuilder#attackFromBestCell(Simulator) Same action (move and attack), but configured to maximize damage

     * @see GeneratorBuilder#attack(Simulator) For only perform the attack, without move

     */

    public final GeneratorBuilder<F> attackFromNearestCell(Simulator simulator) {

        return attack(simulator).add(MoveToAttack.nearest(simulator));

    }

    /**

     * Try to attack from the current cell

     *

     * @param simulator Simulator used by AI

     *

     * @return The builder instance

     *

     * @see Attack The used action generator

     * @see GeneratorBuilder#attackFromBestCell(Simulator) For perform move and attack action

     * @see GeneratorBuilder#attackFromNearestCell(Simulator) For perform move and attack action

     */

    public final GeneratorBuilder<F> attack(Simulator simulator) {

        return add(new Attack<>(simulator));

    }

    /**

     * Try to boost oneself

     *

     * Note: The action will not boost only self fighter, but also allies, with lower priority

     *

     * @param simulator Simulator used by AI

     *

     * @return The builder instance

     *

     * @see Boost#self(Simulator) The used action generator

     * @see GeneratorBuilder#boostAllies(Simulator) To boost allies in priority

     */

    public final GeneratorBuilder<F> boostSelf(Simulator simulator) {

        return add(Boost.self(simulator));

    }

    /**

     * Try to boost allies

     *

     * @param simulator Simulator used by AI

     *

     * @return The builder instance

     *

     * @see Boost#allies(Simulator) The used action generator

     * @see GeneratorBuilder#boostSelf(Simulator) To boost oneself in priority

     */

    public final GeneratorBuilder<F> boostAllies(Simulator simulator) {

        return add(Boost.allies(simulator));

    }

    /**

     * Try to move to the best cell for cast a boost spell

     *

     * To ensure that the move will be performed, add the boost action after this one.

     * The action will not be performed if there is a tackle chance and if an boost is possible from the current cell

     *

     * @param simulator Simulator used by AI

     *

     * @return The builder instance

     *

     * @see MoveToBoost The used action generator

     */

    public final GeneratorBuilder<F> moveToBoost(Simulator simulator) {

        return add(new MoveToBoost<>(simulator)).boostAllies(simulator);

    }

    /**

     * Try to heal allies or self

     *

     * @param simulator Simulator used by AI

     *

     * @return The builder instance

     *

     * @see Heal The used action generator

     */

    public final GeneratorBuilder<F> heal(Simulator simulator) {

        return add(new Heal<>(simulator));

    }

    /**

     * Try to debuff (i.e. apply negative buff) enemies

     *

     * @param simulator Simulator used by AI

     *

     * @return The builder instance

     *

     * @see Debuff The used action generator

     */

    public final GeneratorBuilder<F> debuff(Simulator simulator) {

        return add(new Debuff<>(simulator));

    }

    /**

     * Try to move near the selected enemy

     *

     * @return The builder instance

     *

     * @see MoveNearEnemy The used action generator

     * @see AI#enemy() The selected enemy

     * @see GeneratorBuilder#moveOrTeleportNearEnemy() The move using MP or teleport spell

     */

    public final GeneratorBuilder<F> moveNearEnemy() {

        return add(new MoveNearEnemy<>());

    }

    /**

     * Try to teleport near the selected enemy

     *

     * @return The builder instance

     *

     * @see TeleportNearEnemy The used action generator

     * @see AI#enemy() The selected enemy

     * @see GeneratorBuilder#moveOrTeleportNearEnemy() The move using MP or teleport spell

     */

    public final GeneratorBuilder<F> teleportNearEnemy() {

        return add(new TeleportNearEnemy<>());

    }

    /**

     * Try to move or teleport near the selected enemy

     *

     * This is equivalent to `{@code builder.moveNearEnemy().teleportNearEnemy()}`

     *

     * @return The builder instance

     *

     * @see AI#enemy() The selected enemy

     * @see GeneratorBuilder#moveNearEnemy()

     * @see GeneratorBuilder#moveFarEnemies()

     */

    public final GeneratorBuilder<F> moveOrTeleportNearEnemy() {

        return moveNearEnemy().teleportNearEnemy();

    }

    /**

     * Try to move far all enemies

     *

     * The selected cell is the cell with the highest minimal distance from enemies

     *

     * @return The builder instance

     *

     * @see MoveFarEnemies The used action generator

     */

    /**

     * Try to move near allies

     *

     * The selected cell is the cell with the lowest minimal and average distance from allies

     *

     * @return The builder instance

     *

     * @see MoveNearAllies The used action generator

     */

    public final GeneratorBuilder<F> moveNearAllies() {

        return add(new MoveNearAllies<>());

    }

    /**

     * Build the action generator object

     *

     * If the pipeline is empty, and {@link NullGenerator} will be returned

     * If there is only one action generator, it will be returned

     * Else, create a {@link GeneratorAggregate}

     */

    @SuppressWarnings("unchecked")

    public final ActionGenerator<F> build() {

        if (generators.isEmpty()) {

            return NullGenerator.get();

        }

        if (generators.size() == 1) {

            return generators.get(0);

        }

        return new GeneratorAggregate<>(generators.toArray(new ActionGenerator[0]));

    }

}