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

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package mage.sets.scarsofmirrodin;

import mage.constants.CardType;
import mage.constants.Rarity;
import mage.abilities.Ability;
import mage.abilities.effects.common.CounterTargetEffect;
import mage.cards.CardImpl;
import mage.constants.Zone;
import mage.filter.Filter;
import mage.filter.FilterSpell;
import mage.game.Game;
import mage.game.permanent.Permanent;
import mage.game.stack.Spell;
import mage.game.stack.StackObject;
import mage.target.TargetObject;

import java.util.HashSet;
import java.util.Set;
import java.util.UUID;
import mage.target.Target;

/**
 * @author ayratn
 */
public class TurnAside extends CardImpl<TurnAside> {

    private static FilterSpell filter = new FilterSpell("spell that targets a permanent you control");

    public TurnAside(UUID ownerId) {
        super(ownerId, 49, "Turn Aside", Rarity.COMMON, new CardType[]{CardType.INSTANT}, "{U}");
        this.expansionSetCode = "SOM";
        this.color.setBlue(true);

        // Counter target spell that targets a permanent you control.
        this.getSpellAbility().addEffect(new CounterTargetEffect());
        this.getSpellAbility().addTarget(new CustomTargetSpell(filter));
    }

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

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

    private class CustomTargetSpell extends TargetObject {

        protected FilterSpell filter;

        public CustomTargetSpell() {
            this(1, 1, new FilterSpell());
        }

        public CustomTargetSpell(FilterSpell filter) {
            this(1, 1, filter);
        }

        public CustomTargetSpell(int numTargets, FilterSpell filter) {
            this(numTargets, numTargets, filter);
        }

        public CustomTargetSpell(int minNumTargets, int maxNumTargets, FilterSpell filter) {
            this.minNumberOfTargets = minNumTargets;
            this.maxNumberOfTargets = maxNumTargets;
            this.zone = Zone.STACK;
            this.filter = filter;
            this.targetName = filter.getMessage();
        }

        public CustomTargetSpell(final CustomTargetSpell target) {
            super(target);
            this.filter = target.filter.copy();
        }

        @Override
        public boolean canChoose(UUID sourceId, UUID sourceControllerId, Game game) {
            return canChoose(sourceControllerId, game);
        }

        @Override
        public Set<UUID> possibleTargets(UUID sourceId, UUID sourceControllerId, Game game) {
            return possibleTargets(sourceControllerId, game);
        }

        @Override
        public boolean canTarget(UUID id, Ability source, Game game) {
            if (super.canTarget(id, source, game)) {
                if (targetsMyPermanent(id, source.getControllerId(), game)) {
                    return true;
                }
            }
            return false;
        }

        @Override
        public boolean canChoose(UUID sourceControllerId, Game game) {
            int count = 0;
            for (StackObject stackObject : game.getStack()) {
                if (stackObject instanceof Spell && game.getPlayer(sourceControllerId).getInRange().contains(stackObject.getControllerId()) && filter.match((Spell) stackObject, game)) {
                    if (targetsMyPermanent(stackObject.getId(), sourceControllerId, game)) {
                        count++;
                        if (count >= this.minNumberOfTargets)
                            return true;
                    }
                }
            }
            return false;
        }

        @Override
        public Set<UUID> possibleTargets(UUID sourceControllerId, Game game) {
            Set<UUID> possibleTargets = new HashSet<UUID>();
            for (StackObject stackObject : game.getStack()) {
                if (stackObject instanceof Spell && game.getPlayer(sourceControllerId).getInRange().contains(stackObject.getControllerId()) && filter.match((Spell) stackObject, game)) {
                    if (targetsMyPermanent(stackObject.getId(), sourceControllerId, game)) {

                        possibleTargets.add(stackObject.getId());
                    }
                }
            }
            return possibleTargets;
        }

        @Override
        public Filter getFilter() {
            return filter;
        }

        private boolean targetsMyPermanent(UUID id, UUID controllerId, Game game) {
            StackObject spell = game.getStack().getStackObject(id);
            if (spell != null) {
                Ability ability = spell.getStackAbility();
                for (Target target : ability.getTargets()) {
                    for (UUID permanentId : target.getTargets()) {
                        Permanent permanent = game.getPermanent(permanentId);
                        if (permanent != null && permanent.getControllerId().equals(controllerId)) {
                            return true;
                        }
                    }
                }
            }
            return false;
        }

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