/*
 *  Copyright 2011 BetaSteward_at_googlemail.com. All rights reserved.
 * 
 *  Redistribution and use in source and binary forms, with or without modification, are
 *  permitted provided that the following conditions are met:
 * 
 *     1. Redistributions of source code must retain the above copyright notice, this list of
 *        conditions and the following disclaimer.
 * 
 *     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.
 * 
 *  THIS SOFTWARE IS PROVIDED BY BetaSteward_at_googlemail.com ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 *  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BetaSteward_at_googlemail.com OR
 *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 *  authors and should not be interpreted as representing official policies, either expressed
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 */

package mage.abilities.effects.common.combat;

import java.util.UUID;
import mage.abilities.Ability;
import mage.abilities.effects.RequirementEffect;
import mage.constants.Duration;
import mage.game.Game;
import mage.game.permanent.Permanent;
import mage.watchers.common.BlockedAttackerWatcher;

/**
 *
 * @author BetaSteward_at_googlemail.com
 */
public class MustBeBlockedByTargetSourceEffect extends RequirementEffect {

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

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

    public MustBeBlockedByTargetSourceEffect(final MustBeBlockedByTargetSourceEffect effect) {
        super(effect);
    }

    @Override
    public boolean applies(Permanent permanent, Ability source, Game game) {
        if (permanent.getId().equals(this.getTargetPointer().getFirst(game, source))) {
            Permanent blocker = game.getPermanent(this.getTargetPointer().getFirst(game, source));
            if (blocker != null && blocker.canBlock(source.getSourceId(), game)) {              
                Permanent attacker = (Permanent) source.getSourceObjectIfItStillExists(game);
                if (attacker != null) {
                    BlockedAttackerWatcher blockedAttackerWatcher = (BlockedAttackerWatcher) game.getState().getWatchers().get(BlockedAttackerWatcher.class.getSimpleName());
                    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.getSourceId();
    }

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

}