foul-magics/Mage/src/main/java/mage/abilities/dynamicvalue/common/CardsInAllGraveyardsCount.java

package mage.abilities.dynamicvalue.common;

import mage.abilities.Ability;
import mage.abilities.dynamicvalue.DynamicValue;
import mage.abilities.effects.Effect;
import mage.filter.FilterCard;
import mage.filter.StaticFilters;
import mage.game.Game;
import mage.players.Player;

import java.util.Objects;

/**
 * @author North
 */
public class CardsInAllGraveyardsCount implements DynamicValue {

    private final FilterCard filter;

    public CardsInAllGraveyardsCount() {
        this(StaticFilters.FILTER_CARD);
    }

    public CardsInAllGraveyardsCount(FilterCard filter) {
        this.filter = filter;
    }

    private CardsInAllGraveyardsCount(final CardsInAllGraveyardsCount dynamicValue) {
        this.filter = dynamicValue.filter.copy();
    }

    @Override
    public int calculate(Game game, Ability sourceAbility, Effect effect) {
        return game.getState()
                .getPlayersInRange(sourceAbility.getControllerId(), game)
                .stream()
                .map(game::getPlayer)
                .filter(Objects::nonNull)
                .map(Player::getGraveyard)
                .mapToInt(graveyard -> graveyard.count(
                        filter,
                        sourceAbility.getControllerId(), sourceAbility, game
                )).sum();
    }

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

    @Override
    public String toString() {
        return "1";
    }

    @Override
    public String getMessage() {
        return filter.getMessage() + " in all graveyards";
    }
}