<?php
/**
 * Nextcloud - News
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later. See the COPYING file.
 *
 * @author    Alessandro Cosentino <cosenal@gmail.com>
 * @author    Bernhard Posselt <dev@bernhard-posselt.com>
 * @copyright 2012 Alessandro Cosentino
 * @copyright 2012-2014 Bernhard Posselt
 */

namespace OCA\News\Fetcher;

use FeedIo\Reader\ReadErrorException;

class Fetcher
{

    /**
     * List of fetchers.
     * @var IFeedFetcher[]
     */
    private $fetchers;

    public function __construct()
    {
        $this->fetchers = [];
    }


    /**
     * Add an additional fetcher
     *
     * @param IFeedFetcher $fetcher the fetcher
     */
    public function registerFetcher(IFeedFetcher $fetcher)
    {
        $this->fetchers[] = $fetcher;
    }

    /**
     * Fetch a feed from remote
     *
     * @param  string  $url               remote url of the feed
     * @param  boolean $getFavicon        if the favicon should also be fetched, defaults to true
     * @param  string $lastModified       a last modified value from an http header defaults to false.
     *                                    If lastModified matches the http header from the feed no results are fetched
     * @param  string $user               if given, basic auth is set for this feed
     * @param  string $password           if given, basic auth is set for this feed. Ignored if user is empty
     *
     * @throws ReadErrorException if FeedIO fails
     * @return array an array containing the new feed and its items, first
     * element being the Feed and second element being an array of Items
     */
    public function fetch($url, $getFavicon = true, $lastModified = null, $user = null, $password = null)
    {
        foreach ($this->fetchers as $fetcher) {
            if (!$fetcher->canHandle($url)) {
                continue;
            }
            return $fetcher->fetch(
                $url,
                $getFavicon,
                $lastModified,
                $user,
                $password
            );
        }

        return [null, []];
    }
}