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package mage.abilities.keyword;

import java.util.UUID;
import mage.abilities.Ability;
import mage.abilities.SpellAbility;
import mage.abilities.common.SimpleStaticAbility;
import mage.abilities.costs.AdjustingSourceCosts;
import mage.cards.Card;
import mage.constants.Outcome;
import mage.constants.Zone;
import mage.filter.FilterCard;
import mage.game.Game;
import mage.players.Player;
import mage.target.Target;
import mage.target.common.TargetCardInYourGraveyard;
import mage.util.CardUtil;


/**
 * 702.64. Delve
 *
 * 702.64a Delve is a static ability that functions while the spell that has delve is on
 * the stack. "Delve" means "As an additional cost to cast this spell, you may exile any
 * number of cards from your graveyard. Each card exiled this way reduces the cost to cast
 * this spell by {1}." Using the delve ability follows the rules for paying additional
 * costs in rules 601.2b and 601.2e-g. #
 *
 * 702.64b Multiple instances of delve on the same spell are redundant.
 *
 * @author LevelX2
 *
 */

 public class DelveAbility extends SimpleStaticAbility implements AdjustingSourceCosts {

    public DelveAbility() {
        super(Zone.STACK, null);
        this.setRuleAtTheTop(true);
    }

    public DelveAbility(final DelveAbility ability) {
      super(ability);
    }

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

    @Override
    public void adjustCosts(Ability ability, Game game) {
        Player player = game.getPlayer(controllerId);
        if (player == null || !(ability instanceof SpellAbility)) {
            return;
        }
        Target target = new TargetCardInYourGraveyard(1, Integer.MAX_VALUE, new FilterCard());
        target.setTargetName("cards to delve from your graveyard");
        if (!target.canChoose(sourceId, controllerId, game)) {
            return;
        }
        if (!CardUtil.isCheckPlayableMode(ability) && player.chooseUse(Outcome.Detriment, "Delve cards from your graveyard?", game)) {
            player.chooseTarget(Outcome.Detriment, target, ability, game);
            if (target.getTargets().size() > 0) {
                int adjCost = 0;
                for (UUID cardId: target.getTargets()) {
                    Card card = game.getCard(cardId);
                    if (card == null) {
                        continue;
                    }
                    player.moveCardToExileWithInfo(card, null, "", getSourceId(), game, Zone.GRAVEYARD);
                    ++adjCost;
                }
                game.informPlayers(new StringBuilder("Delve: ").append(player.getName()).append(" exiled ")
                        .append(adjCost).append(" card").append(adjCost != 1?"s":"").append(" from his or her graveyard").toString());
                CardUtil.adjustCost((SpellAbility)ability, adjCost);
            }
        }
    }

    @Override
    public String getRule() {
      return "Delve <i>(You may exile any number of cards from your graveyard as you cast this spell. It costs {1} less to cast for each card exiled this way.)</i>";
    }
}