<?php

/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2012 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Feed\Parser;

use Joomla\CMS\Feed\Feed;
use Joomla\CMS\Feed\FeedEntry;
use Joomla\CMS\Feed\FeedLink;
use Joomla\CMS\Feed\FeedParser;
use Joomla\CMS\Feed\FeedPerson;

// phpcs:disable PSR1.Files.SideEffects
\defined('JPATH_PLATFORM') or die;
// phpcs:enable PSR1.Files.SideEffects

/**
 * RSS Feed Parser class.
 *
 * @link   http://cyber.law.harvard.edu/rss/rss.html
 * @since  3.1.4
 */
class RssParser extends FeedParser
{
    /**
     * @var    string  The feed element name for the entry elements.
     * @since  3.1.4
     */
    protected $entryElementName = 'item';

    /**
     * @var    string  The feed format version.
     * @since  3.1.4
     */
    protected $version;

    /**
     * Method to handle the `<category>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handleCategory(Feed $feed, \SimpleXMLElement $el)
    {
        // Get the data from the element.
        $domain    = (string) $el['domain'];
        $category  = $this->inputFilter->clean((string) $el, 'html');

        $feed->addCategory($category, $domain);
    }

    /**
     * Method to handle the `<cloud>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handleCloud(Feed $feed, \SimpleXMLElement $el)
    {
        $cloud = new \stdClass();
        $cloud->domain            = (string) $el['domain'];
        $cloud->port              = (string) $el['port'];
        $cloud->path              = (string) $el['path'];
        $cloud->protocol          = (string) $el['protocol'];
        $cloud->registerProcedure = (string) $el['registerProcedure'];

        $feed->cloud = $cloud;
    }

    /**
     * Method to handle the `<copyright>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handleCopyright(Feed $feed, \SimpleXMLElement $el)
    {
        $feed->copyright = $this->inputFilter->clean((string) $el, 'html');
    }

    /**
     * Method to handle the `<description>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handleDescription(Feed $feed, \SimpleXMLElement $el)
    {
        $feed->description = $this->inputFilter->clean((string) $el, 'html');
    }

    /**
     * Method to handle the `<generator>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handleGenerator(Feed $feed, \SimpleXMLElement $el)
    {
        $feed->generator = $this->inputFilter->clean((string) $el, 'html');
    }

    /**
     * Method to handle the `<image>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handleImage(Feed $feed, \SimpleXMLElement $el)
    {
        // Create a feed link object for the image.
        $image = new FeedLink(
            (string) $el->url,
            null,
            'logo',
            null,
            $this->inputFilter->clean((string) $el->title, 'html')
        );

        // Populate extra fields if they exist.
        $image->link         = (string) filter_var($el->link, FILTER_VALIDATE_URL);
        $image->description  = $this->inputFilter->clean((string) $el->description, 'html');
        $image->height       = (string) $el->height;
        $image->width        = (string) $el->width;

        $feed->image = $image;
    }

    /**
     * Method to handle the `<language>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handleLanguage(Feed $feed, \SimpleXMLElement $el)
    {
        $feed->language = $this->inputFilter->clean((string) $el, 'html');
    }

    /**
     * Method to handle the `<lastBuildDate>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handleLastBuildDate(Feed $feed, \SimpleXMLElement $el)
    {
        $feed->updatedDate = $this->inputFilter->clean((string) $el, 'html');
    }

    /**
     * Method to handle the `<link>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handleLink(Feed $feed, \SimpleXMLElement $el)
    {
        $link = new FeedLink();
        $link->uri = (string) $el['href'];
        $feed->link = $link;
    }

    /**
     * Method to handle the `<managingEditor>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handleManagingEditor(Feed $feed, \SimpleXMLElement $el)
    {
        $feed->author = $this->processPerson((string) $el);
    }

    /**
     * Method to handle the `<skipDays>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handleSkipDays(Feed $feed, \SimpleXMLElement $el)
    {
        // Initialise the array.
        $days = array();

        // Add all of the day values from the feed to the array.
        foreach ($el->day as $day) {
            $days[] = (string) $day;
        }

        $feed->skipDays = $days;
    }

    /**
     * Method to handle the `<skipHours>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handleSkipHours(Feed $feed, \SimpleXMLElement $el)
    {
        // Initialise the array.
        $hours = array();

        // Add all of the day values from the feed to the array.
        foreach ($el->hour as $hour) {
            $hours[] = (int) $hour;
        }

        $feed->skipHours = $hours;
    }

    /**
     * Method to handle the `<pubDate>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handlePubDate(Feed $feed, \SimpleXMLElement $el)
    {
        $feed->publishedDate = $this->inputFilter->clean((string) $el, 'html');
    }

    /**
     * Method to handle the `<title>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handleTitle(Feed $feed, \SimpleXMLElement $el)
    {
        $feed->title = $this->inputFilter->clean((string) $el, 'html');
    }

    /**
     * Method to handle the `<ttl>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handleTtl(Feed $feed, \SimpleXMLElement $el)
    {
        $feed->ttl = (int) $this->inputFilter->clean((string) $el, 'int');
    }

    /**
     * Method to handle the `<webmaster>` element for the feed.
     *
     * @param   Feed               $feed  The Feed object being built from the parsed feed.
     * @param   \SimpleXMLElement  $el    The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function handleWebmaster(Feed $feed, \SimpleXMLElement $el)
    {
        // Get the tag contents and split it over the first space.
        $tmp = (string) $el;
        $tmp = explode(' ', $tmp, 2);

        // This is really cheap parsing.  Probably need to create a method to do this more robustly.
        $name = null;

        if (isset($tmp[1])) {
            $name = trim(
                $this->inputFilter->clean($tmp[1], 'html'),
                ' ()'
            );
        }

        $email = trim(
            filter_var((string) $tmp[0], FILTER_VALIDATE_EMAIL)
        );

        $feed->addContributor($name, $email, null, 'webmaster');
    }

    /**
     * Method to initialise the feed for parsing.  Here we detect the version and advance the stream
     * reader so that it is ready to parse feed elements.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function initialise()
    {
        // We are on the first XML Element after the xml doc type declaration
        $this->version = $this->stream->getAttribute('version');

        // We want to move forward to the first element after the <channel> element.
        $this->moveToNextElement('channel');
        $this->moveToNextElement();
    }

    /**
     * Method to handle a `<item>` element for the feed.
     *
     * @param   FeedEntry          $entry  The FeedEntry object being built from the parsed feed entry.
     * @param   \SimpleXMLElement  $el     The current XML element object to handle.
     *
     * @return  void
     *
     * @since   3.1.4
     */
    protected function processFeedEntry(FeedEntry $entry, \SimpleXMLElement $el)
    {
        $entry->uri           = (string) filter_var($el->link, FILTER_VALIDATE_URL);
        $entry->title         = $this->inputFilter->clean((string) $el->title, 'html');
        $entry->publishedDate = $this->inputFilter->clean((string) $el->pubDate, 'html');
        $entry->updatedDate   = $this->inputFilter->clean((string) $el->pubDate, 'html');
        $entry->content       = $this->inputFilter->clean((string) $el->description, 'html');
        $entry->guid          = $this->inputFilter->clean((string) $el->guid, 'html');
        $entry->isPermaLink   = $entry->guid !== '' && (string) $el->guid['isPermaLink'] !== 'false';
        $entry->comments      = $this->inputFilter->clean((string) $el->comments, 'html');

        // Add the feed entry author if available.
        $author = $this->inputFilter->clean((string) $el->author, 'html');

        if (!empty($author)) {
            $entry->author = $this->processPerson($author);
        }

        // Add any categories to the entry.
        foreach ($el->category as $category) {
            $entry->addCategory((string) $category, (string) $category['domain']);
        }

        // Add any enclosures to the entry.
        foreach ($el->enclosure as $enclosure) {
            $link = new FeedLink(
                (string) $enclosure['url'],
                null,
                (string) $enclosure['type'],
                null,
                null,
                (int) $enclosure['length']
            );

            $entry->addLink($link);
        }
    }

    /**
     * Method to parse a string with person data and return a FeedPerson object.
     *
     * @param   string  $data  The string to parse for a person.
     *
     * @return  FeedPerson
     *
     * @since   3.1.4
     */
    protected function processPerson($data)
    {
        // Create a new person object.
        $person = new FeedPerson();

        // This is really cheap parsing, but so far good enough. :)
        $data = explode(' ', $data, 2);

        if (isset($data[1])) {
            $person->name = trim(
                $this->inputFilter->clean($data[1], 'html'),
                ' ()'
            );
        }

        // Set the email for the person.
        $person->email = trim(
            filter_var((string) $data[0], FILTER_VALIDATE_EMAIL)
        );

        return $person;
    }
}