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<?php

class WP_Sitemaps_Renderer
{
    protected $stylesheet = '';
    protected $stylesheet_index = '';
    public function __construct()
    {
        $stylesheet_url = $this->get_sitemap_stylesheet_url();
        if ($stylesheet_url) {
            $this->stylesheet = '<?xml-stylesheet type="text/xsl" href="' . esc_url($stylesheet_url) . '" ?>';
        }
        $stylesheet_index_url = $this->get_sitemap_index_stylesheet_url();
        if ($stylesheet_index_url) {
            $this->stylesheet_index = '<?xml-stylesheet type="text/xsl" href="' . esc_url($stylesheet_index_url) . '" ?>';
        }
    }
    public function get_sitemap_stylesheet_url()
    {
        global $wp_rewrite;
        $sitemap_url = home_url('/wp-sitemap.xsl');
        if (!$wp_rewrite->using_permalinks()) {
            $sitemap_url = home_url('/?sitemap-stylesheet=sitemap');
        }
        return apply_filters('wp_sitemaps_stylesheet_url', $sitemap_url);
    }
    public function get_sitemap_index_stylesheet_url()
    {
        global $wp_rewrite;
        $sitemap_url = home_url('/wp-sitemap-index.xsl');
        if (!$wp_rewrite->using_permalinks()) {
            $sitemap_url = home_url('/?sitemap-stylesheet=index');
        }
        return apply_filters('wp_sitemaps_stylesheet_index_url', $sitemap_url);
    }
    public function render_index($sitemaps)
    {
        header('Content-type: application/xml; charset=UTF-8');
        $this->check_for_simple_xml_availability();
        $index_xml = $this->get_sitemap_index_xml($sitemaps);
        if (!empty($index_xml)) {
            echo $index_xml;
        }
    }
    public function get_sitemap_index_xml($sitemaps)
    {
        $sitemap_index = new SimpleXMLElement(sprintf('%1$s%2$s%3$s', '<?xml version="1.0" encoding="UTF-8" ?>', $this->stylesheet_index, '<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" />'));
        foreach ($sitemaps as $entry) {
            $sitemap = $sitemap_index->addChild('sitemap');
            foreach ($entry as $name => $value) {
                if ('loc' === $name) {
                    $sitemap->addChild($name, esc_url($value));
                } elseif ('lastmod' === $name) {
                    $sitemap->addChild($name, esc_xml($value));
                } else {
                    _doing_it_wrong(__METHOD__, sprintf(__('Fields other than %s are not currently supported for the sitemap index.'), implode(',', array('loc', 'lastmod'))), '5.5.0');
                }
            }
        }
        return $sitemap_index->asXML();
    }
    public function render_sitemap($url_list)
    {
        header('Content-type: application/xml; charset=UTF-8');
        $this->check_for_simple_xml_availability();
        $sitemap_xml = $this->get_sitemap_xml($url_list);
        if (!empty($sitemap_xml)) {
            echo $sitemap_xml;
        }
    }
    public function get_sitemap_xml($url_list)
    {
        $urlset = new SimpleXMLElement(sprintf('%1$s%2$s%3$s', '<?xml version="1.0" encoding="UTF-8" ?>', $this->stylesheet, '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" />'));
        foreach ($url_list as $url_item) {
            $url = $urlset->addChild('url');
            foreach ($url_item as $name => $value) {
                if ('loc' === $name) {
                    $url->addChild($name, esc_url($value));
                } elseif (in_array($name, array('lastmod', 'changefreq', 'priority'), true)) {
                    $url->addChild($name, esc_xml($value));
                } else {
                    _doing_it_wrong(__METHOD__, sprintf(__('Fields other than %s are not currently supported for sitemaps.'), implode(',', array('loc', 'lastmod', 'changefreq', 'priority'))), '5.5.0');
                }
            }
        }
        return $urlset->asXML();
    }
    private function check_for_simple_xml_availability()
    {
        if (!class_exists('SimpleXMLElement')) {
            add_filter('wp_die_handler', static function () {
                return '_xml_wp_die_handler';
            });
            wp_die(sprintf(esc_xml(__('Could not generate XML sitemap due to missing %s extension')), 'SimpleXML'), esc_xml(__('WordPress &rsaquo; Error')), array('response' => 501));
        }
    }
}