foul-magics/Mage.Sets/src/mage/sets/scarsofmirrodin/SteelHellkite.java

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package mage.sets.scarsofmirrodin;

import mage.Constants;
import mage.Constants.CardType;
import mage.Constants.Rarity;
import mage.MageInt;
import mage.abilities.Ability;
import mage.abilities.common.ActivateOncePerTurnActivatedAbility;
import mage.abilities.common.SimpleActivatedAbility;
import mage.abilities.costs.mana.GenericManaCost;
import mage.abilities.costs.mana.ManaCostsImpl;
import mage.abilities.effects.OneShotEffect;
import mage.abilities.effects.common.continious.BoostSourceEffect;
import mage.abilities.keyword.FlyingAbility;
import mage.cards.CardImpl;
import mage.game.Game;
import mage.game.events.DamagedPlayerEvent;
import mage.game.events.GameEvent;
import mage.game.permanent.Permanent;
import mage.watchers.WatcherImpl;

import java.util.*;
import mage.Constants.WatcherScope;

/**
 * @author nantuko
 */
public class SteelHellkite extends CardImpl<SteelHellkite> {

	public SteelHellkite(UUID ownerId) {
		super(ownerId, 205, "Steel Hellkite", Rarity.RARE, new CardType[]{CardType.ARTIFACT, CardType.CREATURE}, "{6}");
		this.expansionSetCode = "SOM";
		this.subtype.add("Dragon");

		this.power = new MageInt(5);
		this.toughness = new MageInt(5);

		this.addAbility(FlyingAbility.getInstance());
		// {2}: Steel Hellkite gets +1/+0 until end of turn.
		this.addAbility(new SimpleActivatedAbility(Constants.Zone.BATTLEFIELD, new BoostSourceEffect(1, 0, Constants.Duration.EndOfTurn), new GenericManaCost(2)));
		// {X}: Destroy each nonland permanent with converted mana cost X whose controller was dealt combat damage by Steel Hellkite this turn. Activate this ability only once each turn.
		this.addAbility(new ActivateOncePerTurnActivatedAbility(Constants.Zone.BATTLEFIELD, new SteelHellkiteDestroyEffect(), new ManaCostsImpl("{X}")));

		this.addWatcher(new SteelHellkiteWatcher());
	}

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

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

class SteelHellkiteDestroyEffect extends OneShotEffect {

	public SteelHellkiteDestroyEffect() {
		super(Constants.Outcome.DestroyPermanent);
		staticText = "Destroy each nonland permanent with converted mana cost X whose controller was dealt combat damage by Steel Hellkite this turn";
	}

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

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

	@Override
	public boolean apply(Game game, Ability source) {
        SteelHellkiteWatcher watcher = (SteelHellkiteWatcher) game.getState().getWatchers().get("SteelHellkiteWatcher", source.getSourceId());
        if (watcher != null) {
            int xValue = source.getManaCostsToPay().getX();
            for (UUID uuid : watcher.damagedPlayers) {
                for (Permanent permanent: game.getBattlefield().getAllActivePermanents()) {
                    if (permanent.getControllerId().equals(uuid) && permanent.getManaCost().convertedManaCost() == xValue) {
                        permanent.destroy(source.getId(), game, false);
                    }
                }
            }
        }
        return true;
	}
}

class SteelHellkiteWatcher extends WatcherImpl<SteelHellkiteWatcher> {

	public List<UUID> damagedPlayers = new ArrayList<UUID>();

	public SteelHellkiteWatcher() {
		super("SteelHellkiteWatcher", WatcherScope.CARD);
	}

	public SteelHellkiteWatcher(final SteelHellkiteWatcher watcher) {
		super(watcher);
        for (UUID playerId: watcher.damagedPlayers) {
            damagedPlayers.add(playerId);
        }
	}

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

	@Override
	public void watch(GameEvent event, Game game) {
		if (event.getType() == GameEvent.EventType.DAMAGED_PLAYER) {
            DamagedPlayerEvent damageEvent = (DamagedPlayerEvent)event;
			UUID sourceId = damageEvent.getSourceId();
			Permanent permanent = game.getPermanent(sourceId);
			if (sourceId != null && permanent != null && permanent.getName().equals("Steel Hellkite")) {
                if (!damagedPlayers.contains(event.getTargetId())) {
                    damagedPlayers.add(event.getTargetId());
                }
			}
        }
	}

	@Override
	public void reset() {
		super.reset();
		damagedPlayers.clear();
	}

}