<?php

/*
 * This file is part of the Predis package.
 *
 * (c) Daniele Alessandri <suppakilla@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Predis\Configuration;

use InvalidArgumentException;
use Predis\Connection\MasterSlaveReplication;
use Predis\Connection\ReplicationConnectionInterface;

/**
 * Configures an aggregate connection used for master/slave
 * replication between multiple nodes.
 *
 * @author Daniele Alessandri <suppakilla@gmail.com>
 */
class ReplicationOption implements OptionInterface
{
    /**
     * {@inheritdoc}
     *
     * @todo There's more code than needed due to a bug in filter_var()
     *       as discussed here https://bugs.php.net/bug.php?id=49510
     *       and a different behaviour with NULL values on PHP 5.3.
     */
    public function filter(OptionsInterface $options, $value)
    {
        if ($value instanceof ReplicationConnectionInterface) {
            return $value;
        }

        if (is_bool($value) || $value === null) {
            return $value ? $this->getDefault($options) : null;
        }

        if (!is_object($value) && null !== $asbool = filter_var($value, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)) {
            return $asbool ? $this->getDefault($options) : null;
        }

        throw new InvalidArgumentException('Instance of Predis\Connection\ReplicationConnectionInterface expected');
    }

    /**
     * {@inheritdoc}
     */
    public function getDefault(OptionsInterface $options)
    {
        return new MasterSlaveReplication();
    }
}