foul-magics/Mage/src/main/java/mage/abilities/effects/common/AmplifyEffect.java

package mage.abilities.effects.common;

import mage.abilities.Ability;
import mage.abilities.Mode;
import mage.abilities.effects.ReplacementEffectImpl;
import mage.cards.Card;
import mage.cards.Cards;
import mage.cards.CardsImpl;
import mage.constants.Duration;
import mage.constants.Outcome;
import mage.counters.CounterType;
import mage.filter.common.FilterCreatureCard;
import mage.filter.predicate.Predicate;
import mage.filter.predicate.Predicates;
import mage.filter.predicate.mageobject.CardIdPredicate;
import mage.game.Game;
import mage.game.events.EntersTheBattlefieldEvent;
import mage.game.events.GameEvent;
import mage.game.permanent.Permanent;
import mage.players.Player;
import mage.target.common.TargetCardInHand;

/**
 * Effect for the AmplifyAbility
 * <p>
 * 702.37. Amplify 702.37a Amplify is a static ability. “Amplify N” means “As
 * this object enters the battlefield, reveal any number of cards from your hand
 * that share a creature type with it. This permanent enters the battlefield
 * with N +1/+1 counters on it for each card revealed this way. You can't reveal
 * this card or any other cards that are entering the battlefield at the same
 * time as this card.” 702.37b If a creature has multiple instances of amplify,
 * each one works separately.
 *
 * @author FenrisulfrX
 */
public class AmplifyEffect extends ReplacementEffectImpl {

    private final AmplifyFactor amplifyFactor;

    public enum AmplifyFactor {

        Amplify1("Amplify 1", "put one +1/+1 counters on it", 1),
        Amplify2("Amplify 2", "put two +1/+1 counters on it", 2),
        Amplify3("Amplify 3", "put three +1/+1 counters on it", 3);

        private final String text;
        private final String ruleText;
        private final int factor;

        AmplifyFactor(String text, String ruleText, int factor) {
            this.text = text;
            this.ruleText = ruleText;
            this.factor = factor;
        }

        @Override
        public String toString() {
            return text;
        }

        public String getRuleText() {
            return ruleText;
        }

        public int getFactor() {
            return factor;
        }
    }

    private static class AmplifyPredicate implements Predicate<Card> {
        private final Card card;

        private AmplifyPredicate(Card card) {
            this.card = card;
        }

        @Override
        public boolean apply(Card input, Game game) {
            return input.shareCreatureTypes(game, card);
        }
    }

    public AmplifyEffect(AmplifyFactor amplifyFactor) {
        super(Duration.EndOfGame, Outcome.BoostCreature);
        this.amplifyFactor = amplifyFactor;
    }

    public AmplifyEffect(final AmplifyEffect effect) {
        super(effect);
        this.amplifyFactor = effect.amplifyFactor;
    }

    @Override
    public boolean checksEventType(GameEvent event, Game game) {
        return event.getType() == GameEvent.EventType.ENTERS_THE_BATTLEFIELD;
    }

    @Override
    public boolean applies(GameEvent event, Ability source, Game game) {
        return event.getTargetId().equals(source.getSourceId());
    }

    @Override
    public boolean replaceEvent(GameEvent event, Ability source, Game game) {
        Permanent sourceCreature = ((EntersTheBattlefieldEvent) event).getTarget();
        Player controller = game.getPlayer(source.getControllerId());
        if (controller == null || sourceCreature == null) {
            return false;
        }
        FilterCreatureCard filter = new FilterCreatureCard("creatures cards to reveal");
        filter.add(new AmplifyPredicate(sourceCreature));

        // You can’t reveal this card or any other cards that are entering the battlefield at the same time as this card.
        filter.add(Predicates.not(new CardIdPredicate(source.getSourceId())));
        for (Permanent enteringPermanent : game.getPermanentsEntering().values()) {
            filter.add(Predicates.not(new CardIdPredicate(enteringPermanent.getId())));
        }

        if (controller.getHand().count(filter, source.getControllerId(), source, game) <= 0) {
            return false;
        }
        if (!controller.chooseUse(outcome, "Reveal cards to Amplify?", source, game)) {
            return false;
        }
        TargetCardInHand target = new TargetCardInHand(0, Integer.MAX_VALUE, filter);
        if (controller.chooseTarget(outcome, target, source, game) && !target.getTargets().isEmpty()) {
            Cards cards = new CardsImpl();
            cards.addAll(target.getTargets());
            int amountCounters = cards.size() * amplifyFactor.getFactor();
            sourceCreature.addCounters(CounterType.P1P1.createInstance(amountCounters), source.getControllerId(), source, game);
            controller.revealCards(sourceCreature.getIdName(), cards, game);
        }
        return false;
    }

    @Override
    public String getText(Mode mode) {
        StringBuilder sb = new StringBuilder(amplifyFactor.toString());
        sb.append(" <i>(As this enter the battlefield, ");
        sb.append(amplifyFactor.getRuleText()).append(" for each card"
                + " you reveal that shares a type with it in your hand.)</i>");
        return sb.toString();
    }

    @Override
    public AmplifyEffect copy() {
        return new AmplifyEffect(this);
    }
}