KederektParasite.java example

Explorer
mage-master
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package mage.cards.k;

import java.util.UUID;
import mage.MageInt;
import mage.abilities.TriggeredAbilityImpl;
import mage.abilities.effects.common.DamageTargetEffect;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.CardType;
import mage.constants.Zone;
import mage.game.Game;
import mage.game.events.GameEvent;
import mage.game.events.GameEvent.EventType;
import mage.game.permanent.Permanent;
import mage.target.targetpointer.FixedTarget;

/**
 *
 * @author jeffwadsworth
 */
public class KederektParasite extends CardImpl {

    public KederektParasite(UUID ownerId, CardSetInfo setInfo) {
        super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{B}");
        this.subtype.add("Horror");

        this.power = new MageInt(1);
        this.toughness = new MageInt(1);

        // Whenever an opponent draws a card, if you control a red permanent, you may have Kederekt Parasite deal 1 damage to that player.
        this.addAbility(new KederektParasiteTriggeredAbility());
    }

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

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

class KederektParasiteTriggeredAbility extends TriggeredAbilityImpl {

    KederektParasiteTriggeredAbility() {
        super(Zone.BATTLEFIELD, new DamageTargetEffect(1, false, "opponent"), true);
    }

    KederektParasiteTriggeredAbility(final KederektParasiteTriggeredAbility ability) {
        super(ability);
    }

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

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

    @Override
    public boolean checkTrigger(GameEvent event, Game game) {
        if (game.getOpponents(this.getControllerId()).contains(event.getPlayerId())) {
            boolean youControlRedPermanent = false;
            for (Permanent permanent : game.getBattlefield().getAllActivePermanents(this.getControllerId())) {
                if (permanent.getColor(game).isRed()) {
                    youControlRedPermanent = true;
                    break;
                }
            } 
            if (youControlRedPermanent) {
                getEffects().get(0).setTargetPointer(new FixedTarget(event.getPlayerId()));
                return true;
            }
        }
        return false;
    }

    @Override
    public String getRule() {
        return "Whenever an opponent draws a card, if you control a red permanent, you may have {this} deal 1 damage to that player.";
    }
}