foul-magics/Mage/src/main/java/mage/abilities/keyword/EmergeAbility.java

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package mage.abilities.keyword;

import java.util.UUID;
import mage.abilities.SpellAbility;
import mage.abilities.costs.common.SacrificeTargetCost;
import mage.abilities.costs.mana.ManaCost;
import mage.abilities.costs.mana.ManaCosts;
import mage.cards.Card;
import mage.constants.Outcome;
import mage.constants.SpellAbilityType;
import mage.constants.Zone;
import mage.filter.common.FilterControlledCreaturePermanent;
import mage.filter.predicate.mageobject.CardIdPredicate;
import mage.game.Game;
import mage.game.permanent.Permanent;
import mage.players.Player;
import mage.target.TargetPermanent;
import mage.target.common.TargetControlledCreaturePermanent;
import mage.util.CardUtil;

/**
 *
 * @author emerald000
 */
public class EmergeAbility extends SpellAbility {

    private final ManaCosts<ManaCost> emergeCost;

    public EmergeAbility(Card card, ManaCosts<ManaCost> emergeCost) {
        super(emergeCost, card.getName() + " with emerge", Zone.HAND, SpellAbilityType.BASE_ALTERNATE);
        this.getCosts().addAll(card.getSpellAbility().getCosts().copy());
        this.getEffects().addAll(card.getSpellAbility().getEffects().copy());
        this.getTargets().addAll(card.getSpellAbility().getTargets().copy());
        this.timing = card.getSpellAbility().getTiming();
        this.setRuleAtTheTop(true);
        this.emergeCost = emergeCost.copy();
    }

    public EmergeAbility(final EmergeAbility ability) {
        super(ability);
        this.emergeCost = ability.emergeCost.copy();
    }

    @Override
    public boolean canActivate(UUID playerId, Game game) {
        Player controller = game.getPlayer(this.getControllerId());
        if (controller != null) {
            for (Permanent creature : game.getBattlefield().getActivePermanents(new FilterControlledCreaturePermanent(), this.getControllerId(), this.getSourceId(), game)) {
                ManaCost costToPay = CardUtil.reduceCost(emergeCost.copy(), creature.getConvertedManaCost());
                if (costToPay.canPay(this, this.getSourceId(), this.getControllerId(), game)) {
                    return true;
                }
            }
        }
        return false;
    }

    @Override
    public boolean activate(Game game, boolean noMana) {
        Player controller = game.getPlayer(this.getControllerId());
        if (controller != null) {
            TargetPermanent target = new TargetControlledCreaturePermanent(new FilterControlledCreaturePermanent("creature to sacrifice for emerge"));
            if (controller.choose(Outcome.Sacrifice, target, this.getSourceId(), game)) {
                Permanent creature = game.getPermanent(target.getFirstTarget());
                CardUtil.reduceCost(this, creature.getConvertedManaCost());
                FilterControlledCreaturePermanent filter = new FilterControlledCreaturePermanent(creature.getLogName());
                filter.add(new CardIdPredicate(creature.getId()));
                this.addCost(new SacrificeTargetCost(new TargetControlledCreaturePermanent(filter)));
                return super.activate(game, false);
            }
        }
        return false;
    }

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

    @Override
    public String getRule(boolean all) {
        return getRule();
    }

    @Override
    public String getRule() {
        return "Emerge " + emergeCost.getText() + " <i>(You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's converted mana cost.)</i>";
    }
}