package mage.cards.r;

import java.util.UUID;
import mage.MageInt;
import mage.abilities.Ability;
import mage.abilities.common.AttacksTriggeredAbility;
import mage.abilities.common.SimpleActivatedAbility;
import mage.abilities.costs.mana.ManaCostsImpl;
import mage.abilities.dynamicvalue.DynamicValue;
import mage.abilities.dynamicvalue.common.PermanentsOnBattlefieldCount;
import mage.abilities.dynamicvalue.common.StaticValue;
import mage.abilities.effects.RequirementEffect;
import mage.abilities.effects.common.continuous.BoostSourceEffect;
import mage.abilities.keyword.TrampleAbility;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.*;
import mage.filter.common.FilterAttackingCreature;
import mage.filter.common.FilterCreaturePermanent;
import mage.filter.predicate.mageobject.AnotherPredicate;
import mage.game.Game;
import mage.game.permanent.Permanent;
import mage.target.common.TargetCreaturePermanent;
import mage.watchers.common.BlockedAttackerWatcher;

/**
 *
 * @author jeffwadsworth & L_J
 */
public final class RimehornAurochs extends CardImpl {

    private static final FilterAttackingCreature filter = new FilterAttackingCreature("other attacking Aurochs");

    static {
        filter.add(SubType.AUROCHS.getPredicate());
        filter.add(AnotherPredicate.instance);
    }

    private static final DynamicValue xValue = new PermanentsOnBattlefieldCount(filter);

    public RimehornAurochs(UUID ownerId, CardSetInfo setInfo) {
        super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{4}{G}");
        this.supertype.add(SuperType.SNOW);
        this.subtype.add(SubType.AUROCHS);
        this.power = new MageInt(3);
        this.toughness = new MageInt(3);

        // Trample
        this.addAbility(TrampleAbility.getInstance());

        // Whenever Rimehorn Aurochs attacks, it gets +1/+0 until end of turn for each other attacking Aurochs.
        this.addAbility(new AttacksTriggeredAbility(new BoostSourceEffect(xValue, StaticValue.get(0), Duration.EndOfTurn, true, "it"), false));

        // {2}{S}: Target creature blocks target creature this turn if able.
        Ability ability = new SimpleActivatedAbility(new RimehornAurochsEffect(), new ManaCostsImpl<>("{2}{S}"));
        ability.addTarget(new TargetCreaturePermanent(new FilterCreaturePermanent("creature that must block")));
        ability.addTarget(new TargetCreaturePermanent(new FilterCreaturePermanent("creature that is to be blocked")));
        this.addAbility(ability, new BlockedAttackerWatcher());
    }

    private RimehornAurochs(final RimehornAurochs card) {
        super(card);
    }

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

class RimehornAurochsEffect extends RequirementEffect {

    public RimehornAurochsEffect() {
        this(Duration.EndOfTurn);
    }

    public RimehornAurochsEffect(Duration duration) {
        super(duration);
        staticText = "Target creature blocks target creature this turn if able";
    }

    private RimehornAurochsEffect(final RimehornAurochsEffect effect) {
        super(effect);
    }

    @Override
    public boolean applies(Permanent permanent, Ability source, Game game) {
        if (permanent.getId().equals(source.getTargets().get(0).getFirstTarget())) {
            Permanent blocker = game.getPermanent(source.getTargets().get(0).getFirstTarget());
            if (blocker != null 
                    && blocker.canBlock(source.getTargets().get(1).getFirstTarget(), game)) {              
                Permanent attacker = game.getPermanent(source.getTargets().get(1).getFirstTarget());
                if (attacker != null) {
                    BlockedAttackerWatcher blockedAttackerWatcher = game.getState().getWatcher(BlockedAttackerWatcher.class);
                    if (blockedAttackerWatcher != null 
                            && blockedAttackerWatcher.creatureHasBlockedAttacker(attacker, blocker, game)) {
                        // has already blocked this turn, so no need to do again
                        return false;
                    }                
                    return true;
                } else {
                    discard();
                }
            }
        }
        return false;
    }

    @Override
    public boolean mustAttack(Game game) {
        return false;
    }

    @Override
    public boolean mustBlock(Game game) {
        return true;
    }

    @Override
    public UUID mustBlockAttacker(Ability source, Game game) {  
        return source.getTargets().get(1).getFirstTarget();
    }

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