<?php

namespace App\Fetching;

use App\Utils\Debug;
use DateTimeImmutable;

class RssFeed {
    public $xml;

    /**
     * Loads XML data from the specified URL and stores it as a SimpleXMLElement object
     *
     * @param string $url The URL of feed
     * @return object Returns the current object
     * @throws \Exception If an error occurs while loading the XML
     */
    public function load(string $url): object {
        try {
            /*
            ***** FOR LOCAL DEV ONLY *****
            ***** DISABLE VERIFICATION OF SSL *****
            $context = stream_context_create(array('ssl' => array(
                'verify_peer' => false,
                'verify_peer_name' => false
            )));

            libxml_set_streams_context($context);*/

            $xml = simplexml_load_file($url, 'SimpleXMLElement', LIBXML_NOCDATA);
            $this->xml = $xml;
            return $this;
        } catch (\Exception $e) {
            echo 'Catch in : ',  $e->getMessage(), "\n";
        }
    }

    /**
     * Retrieves the last update time from feed
     *
     * @return string The timestamp of the last update
     */
    public function lastUpdate(): string {
        $feedUpdateTime = new DateTimeImmutable((string)$this->xml->updated);
        return  $feedUpdateTime->format("U");
    }
}