foul-magics/Mage.Sets/src/mage/sets/revisededition/JandorsRing.java

/*
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 *        of conditions and the following disclaimer in the documentation and/or other materials
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package mage.sets.revisededition;

import java.util.UUID;
import mage.abilities.Ability;
import mage.abilities.condition.Condition;
import mage.abilities.costs.common.TapSourceCost;
import mage.abilities.costs.mana.ManaCostsImpl;
import mage.abilities.decorator.ConditionalActivatedAbility;
import mage.abilities.effects.OneShotEffect;
import mage.abilities.effects.common.discard.DiscardCardYouChooseTargetEffect;
import mage.cards.CardImpl;
import mage.constants.CardType;
import mage.constants.Outcome;
import mage.constants.Rarity;
import mage.constants.TargetController;
import mage.constants.WatcherScope;
import mage.constants.Zone;
import mage.filter.FilterCard;
import mage.filter.predicate.mageobject.CardIdPredicate;
import mage.game.Game;
import mage.game.events.GameEvent;
import mage.players.Player;
import mage.watchers.Watcher;

/**
 *
 * @author MarcoMarin
 */
public class JandorsRing extends CardImpl {

    public JandorsRing(UUID ownerId) {
        super(ownerId, 256, "Jandor's Ring", Rarity.RARE, new CardType[]{CardType.ARTIFACT}, "{6}");
        this.expansionSetCode = "3ED";

        Watcher watcher = new JandorsRingWatcher();
        // {2}, {tap}, Discard the last card you drew this turn: Draw a card.
        Ability ability = new ConditionalActivatedAbility(Zone.BATTLEFIELD, new DiscardAndDrawEffect(), new ManaCostsImpl("{2}"), new WatchedCardInHandCondition(), "Last drawn card still in hand?");
        ability.addCost(new TapSourceCost());                
        this.addAbility(ability, watcher);
    }

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

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

class DiscardAndDrawEffect extends OneShotEffect{
    
    
    public DiscardAndDrawEffect() {
        super(Outcome.Discard);
    }
    
    public DiscardAndDrawEffect(final DiscardAndDrawEffect effect) {
        super(effect);
    }
    
    @Override
    public DiscardAndDrawEffect copy() {
        return new DiscardAndDrawEffect(this);
    }
    
    @Override
    public boolean apply(Game game, Ability source) {
        JandorsRingWatcher watcher = (JandorsRingWatcher) game.getState().getWatchers().get("JandorsRingWatcher");        
        
        FilterCard filter = new FilterCard(game.getCard(watcher.lastDrawnCard).getName());
        filter.add(new CardIdPredicate(watcher.lastDrawnCard));
        DiscardCardYouChooseTargetEffect effect = new DiscardCardYouChooseTargetEffect(filter, TargetController.YOU);
        
        if (effect.apply(game, source)){//Conditional was already checked, card should be in hand, but if for some weird reason it fails, the card won't be drawn, although the cost will already be paid            
            Player controller = game.getPlayer(source.getControllerId());
            controller.drawCards(1, game);
            return true;
        }
        return false;
    }
}


class JandorsRingWatcher extends Watcher {

    UUID lastDrawnCard;

    public JandorsRingWatcher() {
        super("JandorsRingWatcher", WatcherScope.PLAYER);
        this.lastDrawnCard = null;
    }

    public JandorsRingWatcher(final JandorsRingWatcher watcher) {
        super(watcher);        
        this.lastDrawnCard = watcher.lastDrawnCard;
    }

    @Override
    public void watch(GameEvent event, Game game) {
        if (event.getType() == GameEvent.EventType.DREW_CARD) {            
            lastDrawnCard = event.getTargetId();
        }
        if (event.getType() == GameEvent.EventType.CLEANUP_STEP_POST) {            
            lastDrawnCard = null;
        }
    }

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

    @Override
    public void reset() {
        super.reset();
        lastDrawnCard = null;
    }
}

class WatchedCardInHandCondition implements Condition {

    private static final WatchedCardInHandCondition fInstance = new WatchedCardInHandCondition();

    public static WatchedCardInHandCondition getInstance() {
        return fInstance;
    }
    
    @Override
    public boolean apply(Game game, Ability source) {
        JandorsRingWatcher watcher = (JandorsRingWatcher) game.getState().getWatchers().get("JandorsRingWatcher");        
        
        return watcher.lastDrawnCard!=null && game.getPlayer(source.getControllerId()).getHand().contains(watcher.lastDrawnCard);
    }

    @Override
    public String toString() {
        return "if last drawn card is still in hand";
    }

    
}