<?php


namespace Queue\Abstracts;


use Exception;
use Queue\Consumer;
use Snowflake\Abstracts\Component;
use Snowflake\Exception\ComponentException;
use Snowflake\Snowflake;

/**
 * Class Queue
 * @package Queue\Abstracts
 */
abstract class Queue extends Component implements Relyon
{


	/**
	 * @param string $key
	 * @param Consumer $consumer
	 * @param int $score
	 * @return false|int
	 * @throws ComponentException
	 * @throws Exception
	 */
	protected function push(string $key, Consumer $consumer, $score = 0)
	{
		$redis = Snowflake::app()->getRedis();
		$serialize = serialize($consumer);
		if (!$redis->lock($hash = md5($serialize))) {
			return false;
		}
		$isExists = $redis->zRevRank($key, $serialize);
		if ($isExists !== null) {
			$redis->zAdd($key, $score, $serialize);
		}
		return $redis->unlink($hash);
	}


	/**
	 * @param $key
	 * @param Consumer $consumer
	 * @return false|int
	 * @throws ComponentException
	 * @throws Exception
	 */
	protected function pop($key, Consumer $consumer)
	{
		$serialize = serialize($consumer);
		$redis = Snowflake::app()->getRedis();
		if (!$redis->lock($hash = md5($serialize))) {
			return false;
		}
		$isExists = $redis->zRevRank($key, $serialize);
		if ($isExists === null) {
			return $redis->unlink($hash);
		}
		$redis->zRem($key, $serialize);
		return $redis->unlink($hash);
	}


}