Wishlist_Request_Parser

class Wishlist_Request_Parser {
	const LIST_PARAM  = 'list';
	const TOKEN_PARAM = 'token';

	/** @var WishlistsApi */
	private $wishlists;

	public function __construct( WishlistsApi $wishlists ) {
		$this->wishlists = $wishlists;
	}

    /**
     * Handle wishlist setup request
     *
     * @param \WP $wp
     */
	public function setup_wishlist_request( \WP $wp ) {
		if ( ! $this->is_wishlist_request( $wp ) ) {
			return;
		}

		$list = $this->requested_list();
		$token = $this->requested_token();

		try {
			$wishlist = new Wishlist( $this->wishlists->getWishlist( $list )->getData() );
			if ( $wishlist->is_public() && $wishlist->token() === $token ) {
				$archive = new Public_Wishlist( $wishlist );
			} else {
				$archive = new Missing_Wishlist();
			}
		} catch ( ApiException $e ) {
			// treat an API error like a missing wishlist
			$archive = new Missing_Wishlist();
		}

		add_action( 'pre_get_posts', [ $archive, 'filter_main_query' ], 0, 1 ); // needs to run before Query::filter_queries() at 10
		add_filter( 'bigcommerce/template=components/catalog/product-archive.php/data', [ $archive, 'remove_refinery' ], 10, 1 );
		add_filter( 'bigcommerce/template=components/catalog/product-archive.php/data', [ $archive, 'set_page_title' ], 10, 1 );
		add_filter( 'post_type_archive_title', [ $archive, 'set_wp_title' ], 10, 2 );
		add_filter( 'bigcommerce/template=components/catalog/no-results.php/data', [ $archive, 'set_no_results_message' ], 10, 1 );
	}

	private function is_wishlist_request( \WP $wp ) {
		$post_type = array_key_exists( 'post_type', $wp->query_vars ) ? $wp->query_vars[ 'post_type' ] : '';
		if ( $post_type !== Product::NAME ) {
			return false;
		}

		if ( ! $this->requested_list() || ! $this->requested_token() ) {
			return false;
		}

		return true;
	}

	private function requested_list() {
		return filter_input( INPUT_GET, self::LIST_PARAM, FILTER_VALIDATE_INT );
	}

	private function requested_token() {
		return filter_input( INPUT_GET, self::TOKEN_PARAM, FILTER_SANITIZE_STRING );
	}
}