<?php

namespace Spatie\Sitemap\Crawler;

use Spatie\Crawler\CrawlObserver;
use Psr\Http\Message\UriInterface;
use Psr\Http\Message\ResponseInterface;
use GuzzleHttp\Exception\RequestException;

class Observer extends CrawlObserver
{
    /** @var callable */
    protected $hasCrawled;

    public function __construct(callable $hasCrawled)
    {
        $this->hasCrawled = $hasCrawled;
    }

    /**
     * Called when the crawler will crawl the url.
     *
     * @param \Psr\Http\Message\UriInterface $url
     */
    public function willCrawl(UriInterface $url)
    {
    }

    /**
     * Called when the crawl has ended.
     */
    public function finishedCrawling()
    {
    }

    /**
     * Called when the crawler has crawled the given url successfully.
     *
     * @param \Psr\Http\Message\UriInterface      $url
     * @param \Psr\Http\Message\ResponseInterface $response
     * @param \Psr\Http\Message\UriInterface|null $foundOnUrl
     */
    public function crawled(
        UriInterface $url,
        ResponseInterface $response,
        ?UriInterface $foundOnUrl = null
    ) {
        ($this->hasCrawled)($url, $response);
    }

    /**
     * Called when the crawler had a problem crawling the given url.
     *
     * @param \Psr\Http\Message\UriInterface         $url
     * @param \GuzzleHttp\Exception\RequestException $requestException
     * @param \Psr\Http\Message\UriInterface|null    $foundOnUrl
     */
    public function crawlFailed(
        UriInterface $url,
        RequestException $requestException,
        ?UriInterface $foundOnUrl = null
    ) {
    }
}
