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<?php
/**
 * Adds support for Yoast SEO Sitemaps
 *  - so that images in a FooGallery are added to the sitemap
 *
 * Created by brad.
 * Date: 21/12/2015
 */
if ( ! class_exists( 'FooGallery_Yoast_Seo_Sitemap_Support' ) ) {

    class FooGallery_Yoast_Seo_Sitemap_Support {

        function __construct() {
            add_filter( 'wpseo_sitemap_urlimages', array( $this, 'add_images_to_sitemap' ), 10, 2 );
        }

        function add_images_to_sitemap( $images, $post_id ) {
            //check the content for $post_id contains a foogallery shortcode
            $post = get_post( $post_id );

            //get all the foogallery shortcodes in the post
            $gallery_shortcodes = foogallery_extract_gallery_shortcodes( $post->post_content );

            foreach ( $gallery_shortcodes as $gallery_id => $shortcode ) {

                //load each gallery
                $gallery = FooGallery::get_by_id( $gallery_id );

                if ( false === $gallery ) continue;

                //add each image to the sitemap image array
                foreach ( $gallery->attachments() as $attachment ) {
                    $image = array(
                        'src'   => $attachment->url,
                        'title' => $attachment->caption,
                        'alt'   => $attachment->alt
                    );
                    $images[] = $image;
                }
            }

            return $images;
        }
    }
}