foul-magics/Mage.Sets/src/mage/sets/journeyintonyx/BrainMaggot.java

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package mage.sets.journeyintonyx;

import java.util.LinkedList;
import java.util.UUID;
import mage.MageInt;
import mage.abilities.Ability;
import mage.abilities.TriggeredAbilityImpl;
import mage.abilities.common.EntersBattlefieldTriggeredAbility;
import mage.abilities.effects.OneShotEffect;
import mage.cards.Card;
import mage.cards.CardImpl;
import mage.constants.CardType;
import mage.constants.Outcome;
import mage.constants.Rarity;
import mage.constants.Zone;
import mage.filter.FilterCard;
import mage.filter.common.FilterNonlandCard;
import mage.game.ExileZone;
import mage.game.Game;
import mage.game.events.GameEvent;
import mage.game.events.ZoneChangeEvent;
import mage.game.permanent.Permanent;
import mage.players.Player;
import mage.target.TargetCard;
import mage.target.common.TargetOpponent;
import mage.util.CardUtil;

/**
 *
 * @author LevelX2
 */
public class BrainMaggot extends CardImpl {

    public BrainMaggot(UUID ownerId) {
        super(ownerId, 62, "Brain Maggot", Rarity.UNCOMMON, new CardType[]{CardType.ENCHANTMENT, CardType.CREATURE}, "{1}{B}");
        this.expansionSetCode = "JOU";
        this.subtype.add("Insect");

        this.color.setBlack(true);
        this.power = new MageInt(1);
        this.toughness = new MageInt(1);

        // When Brain Maggot enters the battlefield, target opponent reveals his or her hand and you choose a nonland card from it. Exile that card until Brain Maggot leaves the battlefield.
        Ability ability = new EntersBattlefieldTriggeredAbility(new BrainMaggotExileEffect());
        ability.addTarget(new TargetOpponent());
        this.addAbility(ability);    
        // Implemented as triggered effect that doesn't uses the stack (implementation with watcher does not work correctly because if the returned creature
        // has a DiesTriggeredAll ability it triggers for the dying / battlefield leaving source object, what shouldn't happen)
        this.addAbility(new BrainMaggotReturnExiledAbility());           
    }

    public BrainMaggot(final BrainMaggot card) {
        super(card);
    }

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

class BrainMaggotExileEffect extends OneShotEffect {

    public BrainMaggotExileEffect() {
        super(Outcome.Benefit);
        this.staticText = "target opponent reveals his or her hand and you choose a nonland card from it. Exile that card until {this} leaves the battlefield";
    }

    public BrainMaggotExileEffect(final BrainMaggotExileEffect effect) {
        super(effect);
    }

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

    @Override
    public boolean apply(Game game, Ability source) {
        Player controller = game.getPlayer(source.getControllerId());
        Player opponent = game.getPlayer(this.getTargetPointer().getFirst(game, source));
        Permanent sourcePermanent = game.getPermanentOrLKIBattlefield(source.getSourceId());
        if (controller != null && opponent != null && sourcePermanent != null) {
            opponent.revealCards(sourcePermanent.getLogName(), opponent.getHand(), game);

            FilterCard filter = new FilterNonlandCard("nonland card to exile");
            TargetCard target = new TargetCard(Zone.HAND, filter);
            if (opponent.getHand().count(filter, game) > 0 && controller.choose(Outcome.Exile, opponent.getHand(), target, game)) {
                Card card = opponent.getHand().get(target.getFirstTarget(), game);
                // If source permanent leaves the battlefield before its triggered ability resolves, the target card won't be exiled.
                if (card != null && game.getState().getZone(source.getSourceId()) == Zone.BATTLEFIELD) {
                    controller.moveCardToExileWithInfo(card, CardUtil.getCardExileZoneId(game, source), sourcePermanent.getName(), source.getSourceId(), game, Zone.HAND);
                }
            }
            return true;
        }
        return false;

    }
}

/**
 * Returns the exiled card as source permanent leaves battlefield
 * Uses no stack
 * @author LevelX2
 */

class BrainMaggotReturnExiledAbility extends TriggeredAbilityImpl {

    public BrainMaggotReturnExiledAbility() {
        super(Zone.BATTLEFIELD, new BrainMaggotReturnExiledCreatureEffect());
        this.usesStack = false;
        this.setRuleVisible(false);
    }

    public BrainMaggotReturnExiledAbility(final BrainMaggotReturnExiledAbility ability) {
        super(ability);
    }

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

    @Override
    public boolean checkTrigger(GameEvent event, Game game) {
        if (event.getType() == GameEvent.EventType.ZONE_CHANGE && event.getTargetId().equals(this.getSourceId())) {
            ZoneChangeEvent zEvent = (ZoneChangeEvent) event;
            if (zEvent.getFromZone() == Zone.BATTLEFIELD) {
                return true;
            }
        }
        return false;
    }
}

class BrainMaggotReturnExiledCreatureEffect extends OneShotEffect {

    public BrainMaggotReturnExiledCreatureEffect() {
        super(Outcome.Benefit);
        this.staticText = "Return exiled nonland card to its owner's hand";
    }

    public BrainMaggotReturnExiledCreatureEffect(final BrainMaggotReturnExiledCreatureEffect effect) {
        super(effect);
    }

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

    @Override
    public boolean apply(Game game, Ability source) {
        Player controller = game.getPlayer(source.getControllerId());
        if (controller != null) {
            ExileZone exile = game.getExile().getExileZone(CardUtil.getCardExileZoneId(game, source));
            Permanent sourcePermanent = game.getPermanentOrLKIBattlefield(source.getSourceId());
            if (exile != null && sourcePermanent != null) {
                LinkedList<UUID> cards = new LinkedList<>(exile);
                for (UUID cardId : cards) {
                    Card card = game.getCard(cardId);
                    controller.moveCardToHandWithInfo(card, source.getSourceId(), game, Zone.EXILED);
                }
                exile.clear();
                return true;
            }            
        }
        return false;
    }
}