Package mage.abilities.effects

Source Code of mage.abilities.effects.AuraReplacementEffect

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package mage.abilities.effects;

import mage.constants.CardType;
import mage.constants.Duration;
import mage.constants.Outcome;
import mage.constants.Zone;
import mage.MageObject;
import mage.abilities.Ability;
import mage.cards.Card;
import mage.game.Game;
import mage.game.events.GameEvent;
import mage.game.events.ZoneChangeEvent;
import mage.game.permanent.Permanent;
import mage.game.permanent.PermanentCard;
import mage.game.stack.StackAbility;
import mage.players.Player;
import mage.target.Target;

import java.util.UUID;
import mage.abilities.SpellAbility;
import mage.abilities.effects.common.AttachEffect;
import mage.game.stack.Spell;

/**
* Cards with the Aura subtype don't change the zone they are in, if there is no
* valid target on the battlefield. Also, when entering the battlefield and it
* was not cast (so from Zone != Hand), this effect gets the target to whitch to attach it
* and adds the Aura the the battlefield and attachs it to the target.
* The "attachTo:" value in game state has to be set therefore.
*
* If no "attachTo:" value is defined, the controlling player has to chose the aura target.
*
* This effect is automatically added to ContinuousEffects at the start of a game
*
* @author North
*/
public class AuraReplacementEffect extends ReplacementEffectImpl {

    public AuraReplacementEffect() {
        super(Duration.EndOfGame, Outcome.Neutral);
    }

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

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

    @Override
    public boolean apply(Game game, Ability source) {
        return true;
    }

    @Override
    public boolean replaceEvent(GameEvent event, Ability source, Game game) {
        Zone fromZone = ((ZoneChangeEvent) event).getFromZone();
        Card card = game.getCard(event.getTargetId());
        UUID sourceId = event.getSourceId();
        UUID controllerId = event.getPlayerId();

        // Aura enters the battlefield attached
        Object object = game.getState().getValue("attachTo:"+card.getId());
        if (object != null && object instanceof PermanentCard) {
            return false;
        }

        UUID targetId = null;
        MageObject sourceObject = game.getObject(sourceId);

        if (sourceObject instanceof Spell) {
            if (fromZone.equals(Zone.EXILED)) {
                // cast from exile (e.g. Neightveil Spector) -> no replacement
                return false;
            }
        }
        if (sourceObject instanceof StackAbility) {
            StackAbility stackAbility = (StackAbility) sourceObject;
            if (!stackAbility.getEffects().isEmpty()) {
                targetId = stackAbility.getEffects().get(0).getTargetPointer().getFirst(game, stackAbility);
            }
        }
       
        if (targetId == null) {
            Target target = card.getSpellAbility().getTargets().get(0);
            Player player = game.getPlayer(card.getOwnerId());
            Outcome auraOutcome = Outcome.BoostCreature;
            Ability: for (Ability ability:card.getAbilities()) {
                if (ability instanceof SpellAbility) {
                    for (Effect effect: ability.getEffects()) {
                        if (effect instanceof AttachEffect) {
                            auraOutcome = effect.getOutcome();
                            break Ability;
                        }
                    }
                }
            }
            if (player != null && player.choose(auraOutcome, target, card.getId(), game)) {
                targetId = target.getFirstTarget();
            }
        }

        Permanent targetPermanent = game.getPermanent(targetId);
        Player targetPlayer = game.getPlayer(targetId);
        if (targetPermanent != null || targetPlayer != null) {
            switch (fromZone) {
                case GRAVEYARD:
                    game.getPlayer(card.getOwnerId()).removeFromGraveyard(card, game);
                    break;
                case HAND:
                    game.getPlayer(card.getOwnerId()).removeFromHand(card, game);
                    break;
                case LIBRARY:
                    game.getPlayer(card.getOwnerId()).removeFromLibrary(card, game);
                    break;
                default:
            }
            game.rememberLKI(card.getId(), fromZone, card);

            PermanentCard permanent = new PermanentCard(card, card.getOwnerId());
            game.getBattlefield().addPermanent(permanent);
            game.setZone(card.getId(), Zone.BATTLEFIELD);
            game.applyEffects();
            permanent.entersBattlefield(event.getSourceId(), game, fromZone, true);
            game.applyEffects();
            game.fireEvent(new ZoneChangeEvent(permanent, controllerId, fromZone, Zone.BATTLEFIELD));

            if (targetPermanent != null) {
                targetPermanent.addAttachment(permanent.getId(), game);
            }
            if (targetPlayer != null) {
                targetPlayer.addAttachment(permanent.getId(), game);
            }
        }
        return true;
    }

    @Override
    public boolean applies(GameEvent event, Ability source, Game game) {
        if (event.getType().equals(GameEvent.EventType.ZONE_CHANGE)) {
            if (((ZoneChangeEvent) event).getToZone().equals(Zone.BATTLEFIELD)
                    && !(((ZoneChangeEvent) event).getFromZone().equals(Zone.HAND)) ) {
                Card card = game.getCard(event.getTargetId());
                if (card != null && card.getCardType().contains(CardType.ENCHANTMENT) && card.hasSubtype("Aura")) {
                    return true;
                }
            }
        }
        return false;
    }
}
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