<?php

namespace App\libs\cache\redis;

use App\libs\PreInstall;
use Illuminate\Support\Env;
use Illuminate\Support\Facades\Config;

class Redis
{
    private $host = '127.0.0.1';
    private $port = 6379;
    private $redis;
    private static $instance;

    private function __construct()
    {
        $redis  = new \Redis();
        $config = [
            'host' => Env::get('redis.host', $this->host),
            'port' => Env::get('redis.port', $this->port),
            'pwd'  => Env::get('redis.pwd', ''),
        ];
        $config = array_merge($config, PreInstall::config('redis'));
        $redis->connect($config['host'], $config['port']);
        if (!empty($config['pwd'])) {
            $redis->auth($config['pwd']);
        }
        $this->redis = $redis;
        $this->redis->select(Config::get('lc.redis.db'));
    }

    public function __call($name, $arguments)
    {
        return \call_user_func_array([$this->redis, $name], $arguments);
    }

    public static function instance()
    {
        if (!self::$instance) {
            self::$instance = new self();
        }

        return self::$instance;
    }

    /**
     * 同步锁
     * 上锁成功返回true
     * 当存在锁（即上锁失败）返回false.
     *
     * @param string $key   锁定的标识
     * @param string $value 锁定值
     * @param int    $ex    锁释放时间，超时自动释放锁
     *
     * @return bool
     */
    public function lock($key, $value, $ex = 3)
    {
        return $this->redis->set($key, $value, ['nx', 'ex' => $ex]);
    }
}