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<?php |
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/** |
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* File: StatsHtmlScrapper.php |
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* |
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* @author Maciej Sławik <[email protected]> |
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* Github: https://github.com/maciejslawik |
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*/ |
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namespace MSlwk\Otomoto\App\Stats\Scrapper; |
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use MSlwk\Otomoto\App\Exception\OffersNotFoundException; |
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use MSlwk\Otomoto\App\Stats\Data\StatsDTO; |
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use MSlwk\Otomoto\App\Stats\Data\StatsDTOInterface; |
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use MSlwk\Otomoto\App\Stats\Scrapper\Data\AverageDataScrapperInterface; |
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use Symfony\Component\DomCrawler\Crawler; |
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/** |
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* Class StatsHtmlScrapper |
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* @package MSlwk\Otomoto\App\Stats\Scrapper |
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*/ |
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class StatsHtmlScrapper implements StatsHtmlScrapperInterface |
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{ |
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const HTML_OFFER_SELECTOR = 'article.offer-item.is-row'; |
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/** |
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* @var AverageDataScrapperInterface |
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*/ |
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private $mileageScrapper; |
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/** |
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* @var AverageDataScrapperInterface |
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*/ |
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private $yearScrapper; |
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/** |
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* @var AverageDataScrapperInterface |
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*/ |
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private $priceScrapper; |
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/** |
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* @var array |
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*/ |
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private $mileages = []; |
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/** |
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* @var array |
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*/ |
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private $prices = []; |
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/** |
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* @var array |
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*/ |
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private $years = []; |
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/** |
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* StatsHtmlScrapper constructor. |
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* @param AverageDataScrapperInterface $mileageScrapper |
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* @param AverageDataScrapperInterface $yearScrapper |
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* @param AverageDataScrapperInterface $priceScrapper |
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*/ |
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public function __construct( |
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AverageDataScrapperInterface $mileageScrapper, |
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AverageDataScrapperInterface $yearScrapper, |
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AverageDataScrapperInterface $priceScrapper |
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) { |
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$this->mileageScrapper = $mileageScrapper; |
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$this->yearScrapper = $yearScrapper; |
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$this->priceScrapper = $priceScrapper; |
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} |
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/** |
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* @param string $html |
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* @return StatsDTOInterface |
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*/ |
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public function scrapModelStats(string $html): StatsDTOInterface |
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{ |
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$crawler = new Crawler($html); |
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$carInstances = $crawler->filter(self::HTML_OFFER_SELECTOR); |
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$carInstances->each(function (Crawler $crawler) use (&$mileages, &$prices, &$years) { |
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$this->mileages[] = $this->mileageScrapper->getAverageData($crawler); |
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$this->prices[] = $this->priceScrapper->getAverageData($crawler); |
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$this->years[] = $this->yearScrapper->getAverageData($crawler); |
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}); |
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$stats = $this->getAverageStats($this->mileages, $this->prices, $this->years); |
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return $stats; |
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} |
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/** |
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* @param $mileages |
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* @param $prices |
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* @param $years |
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* @return StatsDTOInterface |
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* @throws OffersNotFoundException |
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*/ |
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private function getAverageStats(array $mileages, array $prices, array $years): StatsDTOInterface |
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{ |
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$stats = new StatsDTO(); |
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if (!$this->offersFound()) { |
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throw new OffersNotFoundException('No offers were found'); |
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} |
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$stats->setAverageMileage(array_sum($mileages) / count($mileages)); |
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$stats->setAveragePrice(array_sum($prices) / count($prices)); |
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$stats->setAverageYear(array_sum($years) / count($years)); |
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return $stats; |
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} |
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/** |
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* @return bool |
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*/ |
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private function offersFound(): bool |
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{ |
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return count($this->mileages) && count($this->prices) && count($this->years); |
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} |
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} |
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maciejslawik /
otomoto-scrapper
