<?php

namespace App\Libraries;

use GuzzleHttp\Client;
use Symfony\Component\DomCrawler\Crawler;

class CrawlerLibrary
{
    private $_client = null;
    private $_host = "";
    public function __construct(string $host)
    {
        $this->_host = $host;
    }

    final public function getHost(): string
    {
        return $this->_host;
    }

    private function getClient(): Client
    {
        if (is_null($this->_client)) {
            $this->_client = new Client(['verify' => false]);
        }
        return $this->_client;
    }


    final public function getContent(string $url): string
    {
        $response = $this->getClient()->request('GET', $this->gethost() . $url);
        return $response->getBody()->getContents();
    }

    final public function getInnerHTML(string $url, $tag = false)
    {
        $crawler = new Crawler($this->getContent($url));
        return $tag ? $crawler->filter($tag)->html() : $crawler->html();
    }

    final public function getLinks(string $html, string $tag = "a"): array
    {
        $crawler = new Crawler($html);
        return $crawler->filter($tag)->each(
            function (Crawler $node) {
                return $node->attr("href");
            }
        );
    }

    final public function getImages(string $html, $tag = "img"): array
    {
        $crawler = new Crawler($html);
        return $crawler->filter($tag)->each(
            function (Crawler $node) {
                return $node->attr("src");
            }
        );
    }
}