FadeVanishCounterTrigger.java

package magic.model.trigger;

import magic.model.MagicCounterType;
import magic.model.MagicGame;
import magic.model.MagicPermanent;
import magic.model.MagicPlayer;
import magic.model.action.ChangeCountersAction;
import magic.model.action.SacrificeAction;
import magic.model.event.MagicEvent;
import magic.model.event.MagicEventAction;

public class FadeVanishCounterTrigger extends AtUpkeepTrigger {

    private final MagicCounterType counterType;

    public static final FadeVanishCounterTrigger Fade = new FadeVanishCounterTrigger(MagicCounterType.Fade);
    public static final FadeVanishCounterTrigger Time = new FadeVanishCounterTrigger(MagicCounterType.Time);

    private FadeVanishCounterTrigger(final MagicCounterType counterType) {
        this.counterType = counterType;
    }

    @Override
    public boolean accept(final MagicPermanent permanent, final MagicPlayer upkeepPlayer) {
        return permanent.isController(upkeepPlayer);
    }

    @Override
    public MagicEvent executeTrigger(final MagicGame game,final MagicPermanent permanent, final MagicPlayer upkeepPlayer) {
        boolean sacrifice = false;
        final int amount = permanent.getCounters(counterType);
        if (counterType == MagicCounterType.Fade) {
            sacrifice = amount == 0;
            return sacrifice ?
                new MagicEvent(
                    permanent,
                    SAC_PERM,
                    "PN sacrifices SN."
                ):
                new MagicEvent(
                    permanent,
                    REMOVE_FADE_COUNTER,
                    "PN removes a fade counter from SN."
                );
        } else if (counterType == MagicCounterType.Time){
            sacrifice = amount == 1;
            return sacrifice ?
                new MagicEvent(
                    permanent,
                    REMOVE_AND_SAC,
                    "PN removes a time counter from SN. PN sacrifices SN."
                ):
                new MagicEvent(
                    permanent,
                    REMOVE_TIME_COUNTER,
                    "PN removes a time counter from SN."
                );
        }
        return MagicEvent.NONE;
    }

    private static final MagicEventAction SAC_PERM = (final MagicGame game, final MagicEvent event) ->
        game.doAction(new SacrificeAction(event.getPermanent()));

    private static final MagicEventAction REMOVE_TIME_COUNTER = (final MagicGame game, final MagicEvent event) ->
        game.doAction(new ChangeCountersAction(
            event.getPermanent(),
            MagicCounterType.Time,
            -1
        ));

    private static final MagicEventAction REMOVE_AND_SAC = (final MagicGame game, final MagicEvent event) -> {
        game.doAction(new ChangeCountersAction(
            event.getPermanent(),
            MagicCounterType.Time,
            -1
        ));
        game.doAction(new SacrificeAction(event.getPermanent()));
    };

    private static final MagicEventAction REMOVE_FADE_COUNTER = (final MagicGame game, final MagicEvent event) ->
        game.doAction(new ChangeCountersAction(
            event.getPermanent(),
            MagicCounterType.Fade,
            -1
        ));
}