<?php

namespace app\admin\service;

use app\common\constants\ShortUrl;
use app\common\library\Redis;
use think\Config;

class ShortUrlService
{
    /**
     * @var \app\common\model\ShortUrl
     */
    private $_shortUrl;

    public function __construct()
    {
        $this->_shortUrl = model('ShortUrl');
    }

    /**
     * 获取短链接
     * @param $id 短链接id
     * @return bool|string
     * @throws \Exception
     */
    public function getShortUrl($id)
    {
        $redisService = new RedisService();
        $url = $redisService->getShortUrl($id);
        if (empty($url)) {
            $urlInfo = $this->_shortUrl->getInfo($id);
            if (empty($urlInfo)) {
                //todo: 这里需要记日志
            } else {
                $url = $urlInfo->url;
                $redisService->setShortUrl($id, $url);
            }
        }
        return $url;
    }

    /**
     * 创建短链接
     * @param  string $url 长链接
     * @return string
     * @throws \Exception
     */
    public function create($url, $channelId)
    {
        $redisService = new RedisService();
        $urlData = [
            'url' => $url,
            'createtime' => time(),
            'updatetime' => time(),
        ];
        $id = $this->_shortUrl->allowField(true)->insertGetId($urlData);
        $redisService->setShortUrl($id, $url);
        $shortUrlHost = Config::get("site.short_url_host");
        if (preg_match('/ext=({.*?})/', $url, $match_ext)) {
            $ext = $match_ext[1];
            preg_match('/\/t\/(\d+)/', $url, $match_short_referral_id);
            preg_match('/referral_id=(\d+)/', $url, $match_referral_id);
            $referral_id = 0;
            if ($match_short_referral_id) {
                $referral_id = $match_short_referral_id[1];
            }
            if ($match_referral_id) {
                $referral_id = $match_referral_id[1];
            }
            if ($referral_id) {
                $cacheExt = 'RefExt:' . md5($ext);
                Redis::instance()->set($cacheExt, $referral_id);
            }
        }

        if (empty($shortUrlHost)) {
            //取渠道业务域名
            $shortUrlHost = trim(getCurrentDomain($channelId, null, [], true),'/');
        }

        $shortUrl = sprintf('%s/%s/%s', $shortUrlHost, ShortUrl::SHORT_URL_PATH, $id);
        return $shortUrl;
    }
}