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 *  Copyright 2010 BetaSteward_at_googlemail.com. All rights reserved.
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 *
 *     1. Redistributions of source code must retain the above copyright notice, this list of
 *        conditions and the following disclaimer.
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 *     2. Redistributions in binary form must reproduce the above copyright notice, this list
 *        of conditions and the following disclaimer in the documentation and/or other materials
 *        provided with the distribution.
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package mage.abilities.effects.common.continious;

import mage.Constants.Duration;
import mage.Constants.Layer;
import mage.Constants.Outcome;
import mage.Constants.SubLayer;
import mage.abilities.Ability;
import mage.abilities.effects.ContinuousEffectImpl;
import mage.game.Game;
import mage.game.permanent.Permanent;

/**
 *
 * @author LevelX2
 */

public class CanBlockAdditionalCreatureEffect extends ContinuousEffectImpl<CanBlockAdditionalCreatureEffect> {

    protected int amount;

    public CanBlockAdditionalCreatureEffect() {
        this(1);
    }

    /**
     * Changes the number of creatures source creature can block
     *
     * @param amount - 0 = any number, 1-x = n additional blocks
     */
    public CanBlockAdditionalCreatureEffect(int amount) {
        this(Duration.WhileOnBattlefield, amount);
    }

    public CanBlockAdditionalCreatureEffect(Duration duration, int amount) {
        super(duration, Outcome.Benefit);
        this.amount = amount;
        staticText = setText();
    }

    public CanBlockAdditionalCreatureEffect(final CanBlockAdditionalCreatureEffect effect) {
        super(effect);
        this.amount = effect.amount;
    }

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

    @Override
    public boolean apply(Layer layer, SubLayer sublayer, Ability source, Game game) {
        Permanent perm = game.getPermanent(source.getSourceId());
        if (perm != null) {
            switch (layer) {
                case RulesEffects:
                    // maxBlocks = 0 equals to "can block any number of creatures"
                    if (perm.getMaxBlocks() > 0) {
                        perm.setMaxBlocks(perm.getMaxBlocks() + 1);
                    } else {
                        perm.setMaxBlocks(0);
                    }
                    break;
            }
            return true;
        }
        return false;
    }

    @Override
    public boolean apply(Game game, Ability source) {
        return false;
    }

    private String setText() {
        StringBuilder sb = new StringBuilder("{this} can block ");
        switch(amount) {
            case 0:
                sb.append("any number of creatures");
                break;
            case 1:
                sb.append("an additional creature");
                break;
            default:
                sb.append(amount).append(" additional creatures");
        }
        return sb.toString();
    }

    @Override
    public boolean hasLayer(Layer layer) {
        return layer == Layer.RulesEffects;
    }

}