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

package mage.abilities.effects;

import mage.MageObject;
import mage.abilities.Ability;
import mage.abilities.effects.common.asthought.MayLookAtTargetCardEffect;
import mage.cards.Card;
import mage.cards.Cards;
import mage.cards.CardsImpl;
import mage.constants.CastManaAdjustment;
import mage.constants.Duration;
import mage.constants.Outcome;
import mage.game.Game;
import mage.players.Player;
import mage.target.targetpointer.FixedTarget;
import mage.util.CardUtil;

import java.util.Objects;
import java.util.UUID;
import java.util.stream.Collectors;

/**
 * This exiles the target card or cards.
 * Each can be looked at by the source's controller.
 * For each card exiled this way, that player may play|cast that card as long as it stays exiled. (+ mana adjustement)
 * e.g. [[Gonti, Lord of Luxury]]
 *
 * @author Susucr
 */
public class ExileFaceDownYouMayPlayAsLongAsExiledTargetEffect extends OneShotEffect {

    private final boolean useCastSpellOnly;
    private final CastManaAdjustment manaAdjustment;

    public ExileFaceDownYouMayPlayAsLongAsExiledTargetEffect(boolean useCastSpellOnly, CastManaAdjustment manaAdjustment) {
        super(Outcome.Exile);
        switch (manaAdjustment) {
            case NONE:
            case AS_THOUGH_ANY_MANA_TYPE:
            case AS_THOUGH_ANY_MANA_COLOR:
                this.manaAdjustment = manaAdjustment;
                break;
            case WITHOUT_PAYING_MANA_COST: // TODO when needed
            default:
                throw new IllegalArgumentException("Wrong code usage, manaAdjustment is not yet supported: " + manaAdjustment);
        }
        this.useCastSpellOnly = useCastSpellOnly;
    }

    private ExileFaceDownYouMayPlayAsLongAsExiledTargetEffect(final ExileFaceDownYouMayPlayAsLongAsExiledTargetEffect effect) {
        super(effect);
        this.manaAdjustment = effect.manaAdjustment;
        this.useCastSpellOnly = effect.useCastSpellOnly;
    }

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

    @Override
    public boolean apply(Game game, Ability source) {
        Player controller = game.getPlayer(source.getControllerId());
        Cards cards = new CardsImpl(getTargetPointer()
                .getTargets(game, source)
                .stream()
                .map(game::getCard)
                .filter(Objects::nonNull)
                .collect(Collectors.toList())
        );
        if (controller == null || cards.isEmpty()) {
            return false;
        }
        // move card to exile
        UUID exileZoneId = CardUtil.getExileZoneId(game, source.getSourceId(), source.getSourceObjectZoneChangeCounter());
        MageObject sourceObject = source.getSourceObject(game);
        String exileName = sourceObject == null ? "" : sourceObject.getIdName();
        for (Card card : cards.getCards(game)) {
            card.setFaceDown(true, game);
            if (controller.moveCardsToExile(card, source, game, false, exileZoneId, exileName)) {
                card.setFaceDown(true, game);
                switch (manaAdjustment) {
                    case NONE:
                        CardUtil.makeCardPlayable(game, source, card, useCastSpellOnly, Duration.Custom, false, controller.getId(), null);
                        break;
                    case AS_THOUGH_ANY_MANA_TYPE:
                    case AS_THOUGH_ANY_MANA_COLOR:
                        // TODO: untangle why there is a confusion between the two.
                        CardUtil.makeCardPlayable(game, source, card, useCastSpellOnly, Duration.Custom, true, controller.getId(), null);
                        break;
                    case WITHOUT_PAYING_MANA_COST: // TODO.
                    default:
                        throw new IllegalArgumentException("Wrong code usage, manaAdjustment is not yet supported: " + manaAdjustment);
                }
                // For as long as that card remains exiled, you may look at it
                ContinuousEffect effect = new MayLookAtTargetCardEffect(controller.getId());
                effect.setTargetPointer(new FixedTarget(card.getId(), game));
                game.addEffect(effect, source);
            }
        }
        return true;
    }
}