Inventory_Presser_Plugin::generate_rewrite_rules( string $post_type, array $query_vars = array() )

	protected function generate_rewrite_rules( $post_type, $query_vars = array() ) {
		global $wp_rewrite;

		if ( ! is_object( $post_type ) ) {
			$post_type = get_post_type_object( $post_type );
		}

		$rewrite_slugs = apply_filters(
			'invp_rewrite_slugs',
			array(
				$post_type->rewrite['slug'],
			)
		);

		$taxonomies        = get_object_taxonomies( $post_type->name, 'objects' );
		$new_rewrite_rules = array();

		// Add taxonomy filters to the query vars array.
		foreach ( $taxonomies as $taxonomy ) {
			$query_vars[] = $taxonomy->query_var;
		}

		// Loop over all the possible combinations of the query vars.
		$query_vars_count = count( $query_vars );
		for ( $i = 1; $i <= $query_vars_count;  $i++ ) {
			foreach ( $rewrite_slugs as $rewrite_slug ) {
				$new_rewrite_rule = $rewrite_slug . '/';
				$new_query_string = 'index.php?post_type=' . $post_type->name;

				// Prepend the rewrites & queries.
				for ( $n = 1; $n <= $i; $n++ ) {
					$new_rewrite_rule .= '(' . implode( '|', $query_vars ) . ')/([^\/]+?)/';
					$new_query_string .= '&' . $wp_rewrite->preg_index( $n * 2 - 1 ) . '[]=' . $wp_rewrite->preg_index( $n * 2 );
				}

				// Allow paging of filtered post type - WordPress expects 'page' in the URL but uses 'paged' in the query string so paging doesn't fit into our regex.
				$new_paged_rewrite_rule = $new_rewrite_rule . 'page/([0-9]{1,})/';
				$new_paged_query_string = $new_query_string . '&paged=' . $wp_rewrite->preg_index( $i * 2 + 1 );

				// Make the trailing backslash optional.
				$new_paged_rewrite_rule = $new_paged_rewrite_rule . '?$';
				$new_rewrite_rule       = $new_rewrite_rule . '?$';

				// Add the new rewrites.
				$new_rewrite_rules[ $new_paged_rewrite_rule ] = $new_paged_query_string;
				$new_rewrite_rules[ $new_rewrite_rule ]       = $new_query_string;
			}
		}
		return apply_filters( 'invp_rewrite_rules', $new_rewrite_rules );
	}