<?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;


class Fetcher
{

    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                                                        $etag              an etag from an http header.
     *                                                                                          If lastModified matches the
     *                                                                                          http header from the feed no
     *                                                                                          results are fetched
     * @param  bool fullTextEnabled if true tells the fetcher to enhance the
     * articles by fetching custom enhanced content
     * @param  string                                                        $basicAuthUser     if given, basic auth is set for this feed
     * @param  string                                                        $basicAuthPassword if given, basic auth is set for this
     *                                                                                          feed. Ignored if user is null or an
     *                                                                                          empty string
     * @throws FetcherException if simple pie fails
     * @return array an array containing the new feed and its items, first
     * element being the Feed and second element being an array of Items
     */
    public function fetch($url, $getFavicon=true, $lastModified=null,
        $etag=null, $fullTextEnabled=false,
        $basicAuthUser=null, $basicAuthPassword=null
    ) {
        foreach($this->fetchers as $fetcher){
            if($fetcher->canHandle($url)) {
                return $fetcher->fetch(
                    $url, $getFavicon, $lastModified, $etag,
                    $fullTextEnabled, $basicAuthUser,
                    $basicAuthPassword
                );
            }
        }

        return [null, []];
    }


}
