<?php
/**
 * Plugin Sitemap
 *
 * @package XML Sitemap & Google News
 */

namespace XMLSF;

/**
 * XMLSF Sitemap Plugin CLASS.
 */
class Sitemap_Plugin extends Sitemap {
	/**
	 * CONSTRUCTOR
	 *
	 * Runs on init
	 */
	public function __construct() {
		$this->slug               = \sanitize_key( (string) \apply_filters( 'xmlsf_sitemap_slug', 'sitemap' ) );
		$this->server_type        = 'plugin';
		$this->post_type_settings = (array) \get_option( 'xmlsf_post_type_settings', array() );

		// Cache clearance.
		\add_action( 'clean_post_cache', array( $this, 'clean_post_cache' ), 99, 2 );

		// Update term meta lastmod date.
		\add_action( 'transition_post_status', array( $this, 'update_term_modified_meta' ), 10, 3 );

		// Update user meta lastmod date.
		\add_action( 'transition_post_status', array( $this, 'update_user_modified_meta' ), 10, 3 );

		// Update images post meta.
		\add_action( 'transition_post_status', array( $this, 'update_post_images_meta' ), 10, 3 );

		// Update last comment date post meta.
		\add_action( 'transition_comment_status', array( $this, 'update_post_comment_meta' ), 10, 3 );
		\add_action( 'comment_post', array( $this, 'update_post_comment_meta_cp' ), 10, 3 ); // When comment is not held for moderation.

		// MAIN REQUEST filter.
		\add_filter( 'request', array( $this, 'filter_request' ), 1 );

		// Add index archive data filter.
		\add_filter( 'xmlsf_index_archive_data', array( $this, 'index_archive_data' ), 10, 3 );

		// Add RT Camp Nginx Helper NGINX HELPER PURGE URLS filter.
		\add_filter( 'rt_nginx_helper_purge_urls', array( $this, 'nginx_helper_purge_urls' ) );

		// Add sitemap image tags.
		\add_action( 'xmlsf_urlset', array( $this, 'image_schema' ) );
		\add_action( 'xmlsf_tags_after', array( $this, 'image_tag' ), 10, 2 );

		// Add sitemap in Robots TXT.
		add_filter( 'robots_txt', array( $this, 'robots_txt' ), 8 );

		// Compatibility hooks.
		$this->compat();
	}

	/**
	 * Plugin compatibility hooks and filters.
	 * Called from constructor.
	 */
	public function compat() {
		$active_plugins = (array) \get_option( 'active_plugins', array() );

		// Polylang compatibility.
		if ( in_array( 'polylang/polylang.php', $active_plugins, true ) || in_array( 'polylang-pro/polylang.php', $active_plugins, true ) ) {
			\add_filter( 'xmlsf_blogpages', array( __NAMESPACE__ . '\Compat\Polylang', 'get_translations' ) );
			\add_filter( 'xmlsf_frontpages', array( __NAMESPACE__ . '\Compat\Polylang', 'get_translations' ) );
			\add_filter( 'xmlsf_request', array( __NAMESPACE__ . '\Compat\Polylang', 'filter_request' ) );
			\add_action( 'xmlsf_sitemap_loaded', array( __NAMESPACE__ . '\Compat\Polylang', 'request_actions' ) );
			\add_filter( 'xmlsf_root_data', array( __NAMESPACE__ . '\Compat\Polylang', 'root_data' ) );
			\add_filter( 'xmlsf_url_after', array( __NAMESPACE__ . '\Compat\Polylang', 'author_archive_translations' ), 10, 3 );
		}

		// WPML compatibility.
		if ( in_array( 'sitepress-multilingual-cms/sitepress.php', $active_plugins, true ) ) {
			// Make sure we get the correct sitemap URL in language context.
			\add_filter( 'xmlsf_sitemap_url', array( __NAMESPACE__ . '\Compat\WPML', 'convert_url' ), 10, 2 );
			// Add sitemap in Robots TXT.
			\add_filter( 'robots_txt', array( __NAMESPACE__ . '\Compat\WPML', 'sitemap_robots' ), 9 );
		}

		// bbPress compatibility.
		if ( in_array( 'bbpress/bbpress.php', $active_plugins, true ) ) {
			\add_filter( 'xmlsf_request', array( __NAMESPACE__ . '\Compat\BBPress', 'filter_request' ) );
		}

		// XMLSM compatibility.
		if ( in_array( 'xml-sitemaps-manager/xml-sitemaps-manager.php', $active_plugins, true ) ) {
			\add_filter( 'plugins_loaded', array( __NAMESPACE__ . '\Compat\XMLSM', 'disable' ), 11 );
		}
	}

	/**
	 * Registers sitemap rewrite tags and routing rules.
	 *
	 * @since 5.4.5
	 */
	public function register_rewrites() {
		global $wp_rewrite;

		if ( ! $wp_rewrite->using_permalinks() || 0 === strpos( \get_option( 'permalink_structure' ), '/index.php' ) ) {
			// Nothing to do.
			return;
		}

		$slug = $this->slug();

		\add_rewrite_rule( '^' . $slug . '\.xml$', 'index.php?feed=sitemap', 'top' );
		\add_rewrite_rule( '^' . $slug . '-([a-z]+?)?(-[a-z0-9\-_]+?)?(?:\.([0-9]{4,8}))?(?:\.([0-9]{1,2}))?\.xml$', 'index.php?feed=sitemap-$matches[1]$matches[2]&m=$matches[3]&w=$matches[4]', 'top' );
		\add_rewrite_rule( 'wp-sitemap\.xml', 'index.php?feed=sitemap', 'top' );
	}

	/**
	 * Unregisters sitemap rewrite tags and routing rules.
	 *
	 * @since 5.5
	 */
	public function unregister_rewrites() {
		global $wp_rewrite;

		if ( ! $wp_rewrite->using_permalinks() || 0 === strpos( \get_option( 'permalink_structure' ), '/index.php' ) ) {
			// Nothing to do.
			return;
		}

		$slug = $this->slug();

		unset( $wp_rewrite->extra_rules_top[ '^' . $slug . '\.xml$' ] );
		unset( $wp_rewrite->extra_rules_top[ '^' . $slug . '-([a-z]+?)?(-[a-z0-9\-_]+?)?(?:\.([0-9]{4,8}))?(?:\.([0-9]{1,2}))?\.xml$' ] );
		unset( $wp_rewrite->extra_rules_top['wp-sitemap\.xml'] );
	}

	/**
	 * Get the public XML sitemap url.
	 *
	 * @since 5.5
	 *
	 * @param string $sitemap Sitemap name.
	 * @param array  $args    Arguments array:
	 *                        $type - post_type or taxonomy, default false
	 *                        $m    - YYYY, YYYYMM, YYYYMMDD
	 *                        $w    - week of the year ($m must be YYYY format)
	 *                        $gz   - bool for GZ extension (triggers compression verification).
	 *
	 * @return string|false The sitemap URL or false if the sitemap doesn't exist.
	 */
	public function get_sitemap_url( $sitemap = 'index', $args = array() ) {
		// Get our arguments.
		$args = \apply_filters(
			'xmlsf_index_url_args',
			\wp_parse_args(
				$args,
				array(
					'type' => false,
					'm'    => false,
					'w'    => false,
				)
			)
		);

		if ( xmlsf()->using_permalinks() ) {
			// Construct file name.
			$basename = $this->slug();
			if ( 'index' !== $sitemap ) {
				$basename .= '-' . $sitemap;
				$basename .= $args['type'] ? '-' . $args['type'] : '';
				$basename .= $args['m'] ? '.' . $args['m'] : '';
				$basename .= $args['w'] ? '.' . $args['w'] : '';
			}
			$basename .= '.xml';
		} else {
			// Construct request string.
			$basename = '?feed=sitemap';
			if ( 'index' !== $sitemap ) {
				$basename .= '-' . $sitemap;
				$basename .= $args['type'] ? '-' . $args['type'] : '';
				$basename .= $args['m'] ? '&m=' . $args['m'] : '';
				$basename .= $args['w'] ? '&w=' . $args['w'] : '';
			}
		}

		$sitemap_url = \apply_filters( 'xmlsf_sitemap_url', \home_url( $basename ), $sitemap, $args );

		return \esc_url( $sitemap_url );
	}

	/**
	 * Filter request
	 *
	 * @param array $request Original request.
	 *
	 * @return array $request Filtered request.
	 */
	public function filter_request( $request ) {
		global $wp_rewrite;

		// Short-circuit if request was already filtered by this plugin.
		if ( \xmlsf()->request_filtered ) {
			return $request;
		} else {
			\xmlsf()->request_filtered = true;
		}

		// Short-circuit if request is not a feed, does not start with 'sitemap' or is a news sitemap.
		if ( empty( $request['feed'] ) || \strpos( $request['feed'], 'sitemap' ) !== 0 || 'sitemap-news' === $request['feed'] ) {
			return $request;
		}

		/** IT'S A SITEMAP */

		$feed = \explode( '-', $request['feed'], 3 );
		$type = isset( $feed[1] ) ? $feed[1] : '';

		\do_action( 'xmlsf_sitemap_loaded', 'plugin', $type );

		/** MODIFY REQUEST PARAMETERS */

		switch ( $type ) {

			case 'posttype':
				if ( ! isset( $feed[2] ) || ! $this->active_post_type( $feed[2] ) ) {
					return $request;
				}

				// Try to raise memory limit, context added for filters.
				\wp_raise_memory_limit( 'sitemap-posttype-' . $feed[2] );

				// Prepare priority calculation.
				if ( ! empty( $this->post_type_settings[ $feed[2] ] ) && ! empty( $this->post_type_settings[ $feed[2] ]['priority'] ) && ! empty( $this->post_type_settings[ $feed[2] ]['dynamic_priority'] ) ) {
					// Last of this post type modified date in Unix seconds.
					\xmlsf()->lastmodified = \get_date_from_gmt( \get_lastpostmodified( 'GMT', $feed[2] ), 'U' );
					// Calculate time span, uses get_firstpostdate() function defined in xml-sitemap/inc/functions.php!
					\xmlsf()->timespan = \xmlsf()->lastmodified - \get_date_from_gmt( get_firstpostdate( 'GMT', $feed[2] ), 'U' );
					// Total post type comment count.
					\xmlsf()->comment_count = \wp_count_comments()->approved;
					// TODO count comments per post type https://wordpress.stackexchange.com/questions/134338/count-all-comments-of-a-custom-post-type
					// TODO cache this more persistently than wp_cache_set does in https://developer.wordpress.org/reference/functions/wp_count_comments/.
				}

				// Setup filters.
				\add_filter(
					'post_limits',
					function () {
						return 'LIMIT 0, 50000';
					}
				);

				// Modify request.
				$request['post_type'] = $feed[2];

				// Prevent term cache update query unless needed for permalinks.
				if ( \strpos( \get_option( 'permalink_structure' ), '%category%' ) === false ) {
					$request['update_post_term_cache'] = false;
				}

				// Make sure to update meta cache for:
				// 1. excluded posts.
				// 2. image data (if activated).
				// 3. lasmod on comments (if activated).
				$request['update_post_meta_cache'] = true;
				break;

			case 'taxonomy':
				$disabled = \get_option( 'xmlsf_disabled_providers', get_default_settings( 'disabled_providers' ) );
				if ( ! isset( $feed[2] ) || ( ! empty( $disabled ) && in_array( 'taxonomies', (array) $disabled, true ) ) ) {
					return $request;
				}

				$taxonomies = \get_option( 'xmlsf_taxonomies' );
				if ( ! empty( $taxonomies ) && ! \in_array( $feed[2], (array) $taxonomies, true ) ) {
					return $request;
				}

				// Try to raise memory limit, context added for filters.
				\wp_raise_memory_limit( 'sitemap-taxonomy-' . $feed[2] );
				// Pass on taxonomy name via request.
				$request['taxonomy'] = $feed[2];
				// Set terms args.
				\add_filter( 'get_terms_args', array( $this, 'set_terms_args' ), 9 );
				break;

			case 'author':
				$disabled = \get_option( 'xmlsf_disabled_providers', get_default_settings( 'disabled_providers' ) );
				if ( ! empty( $disabled ) && \in_array( 'users', (array) $disabled, true ) ) {
					return $request;
				}

				// Set users args.
				\add_filter( 'xmlsf_get_author_args', array( $this, 'set_authors_args' ), 9 );
				// Set user filter for multisite.
				\add_filter( 'xmlsf_skip_user', array( $this, 'skip_deleted_or_spam_authors' ), 10, 2 );
				break;

			default:
				// We're on the index. Do nothing.
		}

		$request['post_status']   = 'publish';
		$request['no_found_rows'] = true; // Found rows calc is slow and only needed for pagination.

		// SPECIFIC REQUEST FILTERING AND PREPARATIONS.

		/** FILTER HOOK FOR PLUGIN COMPATIBILITIES */

		/**
		 * Filters the request.
		 *
		 * Use add_filter( 'xmlsf_request', 'your_filter_function' );
		 *
		 * Possible filters hooked here:
		 * XMLSF\Compat/Polylang->filter_request - Polylang compatibility
		 * XMLSF\Compat\WPML->filter_request - WPML compatibility
		 * XMLSF\Compat/BBPress->filter_request - bbPress compatibility
		 */
		$request = \apply_filters( 'xmlsf_request', $request );

		/** PREPARE TO LOAD TEMPLATE */
		\add_action(
			'do_feed_' . $request['feed'],
			array( $this, 'load_template' ),
			10,
			2
		);

		return $request;
	}

	/**
	 * Load feed template
	 *
	 * Hooked into do_feed_{sitemap...}. First checks for a child/parent theme template file, then falls back to plugin template
	 *
	 * @since 5.3
	 *
	 * @param bool   $is_comment_feed Unused.
	 * @param string $feed            Feed type.
	 */
	public function load_template( $is_comment_feed, $feed ) {
		/**
		 * GET TEMPLATE FILE
		 *
		 * DEVELOPERS: a custom template file in the active (parent or child) theme directory will be used when found there
		 *
		 * Must start with 'sitemap', optionally folowed by other designators, serperated by hyphens.
		 * It should always end with the php extension.
		 *
		 * Examples:
		 * sitemap.php
		 * sitemap-posttype.php
		 * * sitemap-posttype-post.php
		 * * sitemap-posttype-page.php
		 * * sitemap-posttype-[custom_post_type].php
		 * sitemap-taxonomy.php
		 * * sitemap-taxonomy-category.php
		 * * sitemap-taxonomy-post_tag.php
		 * * sitemap-taxonomy-[custom_taxonomy].php
		 * sitemap-authors.php
		 * sitemap-custom.php
		 */

		$parts     = \explode( '-', $feed, 3 );
		$templates = array();
		$found     = false;

		// Possible theme template file names.
		if ( ! empty( $parts[1] ) && \in_array( $parts[1], array( 'posttype', 'taxonomy', 'author', 'custom' ), true ) ) {
			if ( ! empty( $parts[2] ) ) {
				$templates[] = "sitemap-{$parts[1]}-{$parts[2]}.php";
			}
			$templates[] = "sitemap-{$parts[1]}.php";
		}
		$templates[] = 'sitemap.php';

		// Locate and load theme template file or use plugin template.
		if ( ! \locate_template( $templates, true ) ) {
			foreach ( $templates as $template ) {
				$file = XMLSF_DIR . '/views/feed-' . $template;
				if ( \file_exists( $file ) ) {
					\load_template( $file );
					break;
				}
			}
		}
	}


	/**
	 * Terms arguments filter
	 * Does not check if we are really in a sitemap feed.
	 *
	 * @param array $args Term arguments.
	 *
	 * @return array
	 */
	public function set_terms_args( $args ) {
		// Read more on https://developer.wordpress.org/reference/classes/wp_term_query/__construct/.
		$options = \get_option( 'xmlsf_taxonomy_settings', get_default_settings( 'taxonomy_settings' ) );

		$args['number'] = isset( $options['limit'] ) && \is_numeric( $options['limit'] ) && $options['limit'] > 0 ? \intval( $options['limit'] ) : 2000;

		if ( $args['number'] > 50000 ) {
			$args['number'] = 50000;
		}

		$args['order']                  = 'DESC';
		$args['orderby']                = 'count';
		$args['pad_counts']             = true;
		$args['lang']                   = '';
		$args['hierarchical']           = false;
		$args['suppress_filter']        = true;
		$args['hide_empty']             = true;
		$args['update_term_meta_cache'] = false;

		return $args;
	}

	/**
	 * Authors arguments filter
	 * Does not check if we are really in a sitemap feed.
	 *
	 * @param array $args Author arguments.
	 *
	 * @return array
	 */
	public function set_authors_args( $args ) {
		$post_types = \get_post_types( array( 'public' => true ) );

		// We're not supporting sitemaps for author pages for attachments and pages.
		unset( $post_types['attachment'] );
		unset( $post_types['page'] );

		/**
		 * Filters the has_published_posts query argument in the author archive. Must return a boolean or an array of one or multiple post types.
		 * Allows to add or change post type when theme author archive page shows custom post types.
		 *
		 * @since 5.4
		 *
		 * @param array Array with post type slugs. Default array('post').
		 *
		 * @return mixed
		 */
		$post_types = \apply_filters( 'xmlsf_author_has_published_posts', $post_types );

		$options = \get_option( 'xmlsf_author_settings', get_default_settings( 'author_settings' ) );

		$args['has_published_posts'] = $post_types;
		$args['number']              = ! empty( $options['limit'] ) && \is_numeric( $options['limit'] ) && $options['limit'] > 0 ? \intval( $options['limit'] ) : 2000;

		if ( $args['number'] > 50000 ) {
			$args['number'] = 50000;
		}

		$include = \get_option( 'xmlsf_authors' );
		if ( ! empty( $include ) ) {
			$args['include'] = (array) $include;
		}

		return $args;
	}

	/**
	 * Exclude spammed or deleted Authors in a multisite environment.
	 * Does not check if we are really in a sitemap feed.
	 *
	 * @param bool $skip Skip or not skip.
	 * @param obj  $user User object.
	 *
	 * @uses is_multisite()
	 *
	 * @return bool
	 */
	public function skip_deleted_or_spam_authors( $skip, $user ) {
		if ( ! \is_multisite() ) {
			return $skip;
		}

		if ( \property_exists( $user, 'deleted' ) && $user->deleted ) {
			return true;
		}

		if ( \property_exists( $user, 'spam' ) && $user->spam ) {
			return true;
		}

		return $skip;
	}

	/**
	 * Post archives data
	 *
	 * @param array  $data         Data.
	 * @param string $post_type    Post type.
	 * @param string $archive_type Archive type.
	 *
	 * @return array $data
	 */
	public function index_archive_data( $data, $post_type = 'post', $archive_type = '' ) {
		return \array_merge( $data, $this->get_index_archive_data( $post_type, $archive_type ) );
	}

	/**
	 * Get post archives data
	 *
	 * @param string $post_type    Post type.
	 * @param string $archive_type Archive type.
	 *
	 * @return array
	 */
	public function get_index_archive_data( $post_type, $archive_type ) {
		global $wpdb;

		$return = array();

		if ( 'weekly' === $archive_type ) :

			$week       = \_wp_mysql_week( '`post_date`' );
			$query      = $wpdb->prepare( "SELECT DISTINCT LPAD(%d,2,'0') AS `week`, YEAR(`post_date`) AS `year`, COUNT(`ID`) AS `posts` FROM %s WHERE `post_type` = %s AND `post_status` = 'publish' GROUP BY YEAR(`post_date`), LPAD(%d,2,'0') ORDER BY `year` DESC, `week` DESC", array( $week, $wpdb->posts, $post_type, $week ) );
			$arcresults = $this->cache_get_archives( $query );

			foreach ( (array) $arcresults as $arcresult ) {
				$url            = $this->get_sitemap_url(
					'posttype',
					array(
						'type' => $post_type,
						'm'    => $arcresult->year,
						'w'    => $arcresult->week,
					)
				);
				$return[ $url ] = \get_date_from_gmt( \get_lastmodified( 'GMT', $post_type, $arcresult->year, $arcresult->week ), DATE_W3C );
			}

		elseif ( 'monthly' === $archive_type ) :

			$query      = $wpdb->prepare( "SELECT YEAR(`post_date`) AS `year`, LPAD(MONTH(`post_date`),2,'0') AS `month`, COUNT(`ID`) AS `posts` FROM $wpdb->posts WHERE `post_type` = %s AND `post_status` = 'publish' GROUP BY YEAR(`post_date`), LPAD(MONTH(`post_date`),2,'0') ORDER BY `year` DESC, `month` DESC", $post_type );
			$arcresults = $this->cache_get_archives( $query );

			foreach ( (array) $arcresults as $arcresult ) {
				$url            = $this->get_sitemap_url(
					'posttype',
					array(
						'type' => $post_type,
						'm'    => $arcresult->year . $arcresult->month,
					)
				);
				$return[ $url ] = \get_date_from_gmt( \get_lastmodified( 'GMT', $post_type, $arcresult->year . $arcresult->month ), DATE_W3C );
			}

		elseif ( 'yearly' === $archive_type ) :

			$query      = $wpdb->prepare( "SELECT YEAR(`post_date`) AS `year`, COUNT(`ID`) AS `posts` FROM $wpdb->posts WHERE `post_type` = %s AND `post_status` = 'publish' GROUP BY YEAR(`post_date`) ORDER BY `year` DESC", $post_type );
			$arcresults = $this->cache_get_archives( $query );

			foreach ( (array) $arcresults as $arcresult ) {
				$url            = $this->get_sitemap_url(
					'posttype',
					array(
						'type' => $post_type,
						'm'    => $arcresult->year,
					)
				);
				$return[ $url ] = \get_date_from_gmt( \get_lastmodified( 'GMT', $post_type, $arcresult->year ), DATE_W3C );
			}

		else :

			$query      = $wpdb->prepare( "SELECT COUNT(ID) AS `posts` FROM $wpdb->posts WHERE `post_type` = %s AND `post_status` = 'publish' ORDER BY `post_date` DESC", $post_type );
			$arcresults = $this->cache_get_archives( $query );

			if ( is_object( $arcresults[0] ) && $arcresults[0]->posts > 0 ) {
				$url            = $this->get_sitemap_url( 'posttype', array( 'type' => $post_type ) );
				$return[ $url ] = \get_date_from_gmt( \get_lastmodified( 'GMT', $post_type ), DATE_W3C );
			}

		endif;

		return $return;
	}

	/**
	 * Get archives from wp_cache
	 *
	 * @param string $sql The prepared query.
	 *
	 * @return array
	 */
	private function cache_get_archives( $sql ) {
		global $wpdb;

		$key    = \md5( $sql );
		$_cache = \wp_cache_get( 'xmlsf_get_archives', 'general' );
		$cache  = false === $_cache ? array() : $_cache;

		if ( ! isset( $cache[ $key ] ) ) {
			$cache[ $key ] = $wpdb->get_results( $sql ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.DirectDatabaseQuery.DirectQuery
			\wp_cache_set( 'xmlsf_get_archives', $cache, 'general' );
		}

		return $cache[ $key ];
	}

	/**
	 * Do image tag
	 *
	 * @param string  $type Post type.
	 * @param WP_Post $post Post object.
	 *
	 * @return void
	 */
	public function image_tag( $type, $post = null ) {
		if ( 'post_type' !== $type || null === $post || ! $this->active_post_type( $post->post_type ) ) {
			return;
		}

		$settings = $this->post_type_settings( $post->post_type );

		if (
			isset( $settings['tags'] ) &&
			\is_array( $settings['tags'] ) &&
			! empty( $settings['tags']['image'] ) &&
			\is_string( $settings['tags']['image'] )
		) {
			$images = \get_post_meta( $post->ID, '_xmlsf_image_' . $settings['tags']['image'] );
			foreach ( $images as $img ) {
				if ( empty( $img['loc'] ) ) {
					continue;
				}

				echo '<image:image><image:loc>' . \esc_xml( \utf8_uri_encode( $img['loc'] ) ) . '</image:loc>';
				if ( ! empty( $img['title'] ) ) {
					echo '<image:title><![CDATA[' . \esc_xml( $img['title'] ) . ']]></image:title>';
				}
				if ( ! empty( $img['caption'] ) ) {
					echo '<image:caption><![CDATA[' . \esc_xml( $img['caption'] ) . ']]></image:caption>';
				}
				\do_action( 'xmlsf_image_tags_inner', 'post_type' );
				echo '</image:image>';
			}
		}
	}

	/**
	 * Image schema
	 *
	 * @param string $type Type.
	 * @uses WP_Post $post
	 * @return void
	 */
	public function image_schema( $type ) {
		global $wp_query;

		if ( 'post_type' !== $type || empty( $wp_query->query_vars['post_type'] ) || ! $this->active_post_type( $wp_query->query_vars['post_type'] ) ) {
			return;
		}

		$settings = $this->post_type_settings( $wp_query->query_vars['post_type'] );

		if (
			isset( $settings['tags'] ) &&
			\is_array( $settings['tags'] ) &&
			! empty( $settings['tags']['image'] )
		) {
			echo 'xmlns:image="http://www.google.com/schemas/sitemap-image/1.1"';
		}
	}

	/**
	 * Nginx helper purge urls
	 * adds sitemap urls to the purge array.
	 *
	 * @param array $urls     URLs array.
	 * @param bool  $wildcard Use wildcard or not.
	 *
	 * @return $urls array
	 */
	public function nginx_helper_purge_urls( $urls = array(), $wildcard = false ) {
		$slug = $this->slug();

		if ( $wildcard ) {
			// Wildcard makes everything simple.
			$urls[] = '/' . $slug . '*.xml';
		} else {
			// No wildcard, go through the motions.
			$urls[] = '/' . $slug . '.xml';
			$urls[] = '/' . $slug . '-author.xml';
			$urls[] = '/' . $slug . '-custom.xml';

			// Add public post types sitemaps.
			$post_types = $this->get_post_types();
			foreach ( $post_types as $post_type ) :
				$settings     = $this->post_type_settings( $post_type );
				$archive      = isset( $settings['archive'] ) ? $settings['archive'] : '';
				$archive_data = \apply_filters( 'xmlsf_index_archive_data', array(), $post_type, $archive );

				foreach ( $archive_data as $url => $lastmod ) {
					$path = \wp_parse_url( $url, PHP_URL_PATH );
					if ( $path ) {
						$urls[] = $path;
					}
				}
			endforeach;

			// Add public post taxonomies sitemaps.
			$taxonomies = $this->get_taxonomies();
			foreach ( $taxonomies as $taxonomy ) {
				$path = \wp_parse_url( $this->get_sitemap_url( 'taxonomy', array( 'type' => $taxonomy ) ), PHP_URL_PATH );
				if ( $path ) {
					$urls[] = $path;
				}
			}
		}

		\do_action( 'xmlsf_nginx_helper_purge_urls', $urls );

		return $urls;
	}

	/**
	 * Filter robots.txt rules
	 *
	 * @since 5.5
	 *
	 * @param string $output Output.
	 * @return string
	 */
	public function robots_txt( $output ) {
		return $output . PHP_EOL . 'Sitemap: ' . $this->get_sitemap_url() . PHP_EOL;
	}
}