<?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\Commands;

/**
 * @link http://redis.io/commands/blpop
 * @author Daniele Alessandri <suppakilla@gmail.com>
 */
class ListPopFirstBlocking extends Command implements IPrefixable
{
    /**
     * {@inheritdoc}
     */
    public function getId()
    {
        return 'BLPOP';
    }

    /**
     * {@inheritdoc}
     */
    protected function filterArguments(Array $arguments)
    {
        if (count($arguments) === 2 && is_array($arguments[0])) {
            list($arguments, $timeout) = $arguments;
            array_push($arguments, $timeout);
        }
        return $arguments;
    }

    /**
     * {@inheritdoc}
     */
    public function prefixKeys($prefix)
    {
        PrefixHelpers::skipLast($this, $prefix);
    }

    /**
     * {@inheritdoc}
     */
    protected function canBeHashed()
    {
        return $this->checkSameHashForKeys(
            array_slice(($args = $this->getArguments()), 0, count($args) - 1)
        );
    }
}