* Initialize the WooCommerce specific classes.
	 */
	public function init_local_seo_woocommerce() {
		// Check if WooCommerce is active.
		$active_plugins = apply_filters( 'active_plugins', get_option( 'active_plugins' ) );
		if ( in_array( 'woocommerce/woocommerce.php', $active_plugins, true ) ) {

			$version = $this->get_woocommerce_version_number();

			if ( version_compare( $version, $this->min_woocommerce_version, '>=' ) ) {
				/*
				 * We have the right WooCommerce version, go gadget go...
				 * @todo: We can do better than all these 'requires' <= +1 from JRF.
				 * @todo: Refactor this to auto loading.
				 */
				require_once WPSEO_LOCAL_PATH . 'woocommerce/includes/class-wc-post-types.php';
				$wpseo_local_woocommerce_post_types = new Yoast_WCSEO_Local_Post_Types();
				$wpseo_local_woocommerce_post_types->init();

				require_once WPSEO_LOCAL_PATH . 'woocommerce/shipping/class-wc-shipping.php';
				require_once WPSEO_LOCAL_PATH . 'woocommerce/shipping/class-wc-shipping-method.php';
				$wpseo_local_woocommerce_shipping = new Yoast_WCSEO_Local_Shipping();
				$wpseo_local_woocommerce_shipping->init();

				require_once WPSEO_LOCAL_PATH . 'woocommerce/admin/class-wc-transport.php';
				require_once WPSEO_LOCAL_PATH . 'woocommerce/admin/class-wc-transport-list.php';
				$wpseo_local_woocommerce_transport = new Yoast_WCSEO_Local_Transport();
				$wpseo_local_woocommerce_transport->init();

				require_once WPSEO_LOCAL_PATH . 'woocommerce/admin/class-admin-columns.php';
				require_once WPSEO_LOCAL_PATH . 'woocommerce/emails/class-wc-emails.php';
				require_once WPSEO_LOCAL_PATH . 'woocommerce/includes/wpseo-local-woocommerce-functions.php';

				require_once WPSEO_LOCAL_PATH . 'woocommerce/admin/class-woocommerce-settings.php';
				new WPSEO_Local_Admin_Woocommerce_Settings();

				if ( is_admin() ) {
					new Yoast_WCSEO_Local_Admin_Columns();
				}
			}
			else {
				// User has an old WooCommerce version.
				add_action( 'all_admin_notices', [ $this, 'error_outdated_woocommerce' ] );
			}
		}
	}

	/**
	 * Retrieves the version number of the active WooCommerce plugin.
	 *
	 * @return string|null The version number or null if it couldn't be determined.
	 */
	private function get_woocommerce_version_number() {

		// If get_plugins() isn't available, require it.
		if ( ! function_exists( 'get_plugins' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}

		// Create the plugins folder and file variables.
		$plugin_folder = get_plugins( '/woocommerce' );
		$plugin_file   = 'woocommerce.php';

		// If the plugin version number is set, return it.
		if ( isset( $plugin_folder[ $plugin_file ]['Version'] ) ) {
			return $plugin_folder[ $plugin_file ]['Version'];
		}
		else {
			// Otherwise return null.
			return null;
		}
	}

	/**
	 * Throw an error if WooCommerce is out of date.
	 */
	public function error_outdated_woocommerce() {
		$this->admin_message(
			sprintf(
				/* translators: %s expands to "Yoast SEO: Local for WooCommerce". */
				__( 'Please upgrade the WooCommerce plugin to the latest version to allow the "%s" plugin to work.', 'yoast-local-seo' ),
				$this->_plugin_name
			),
			'error'
		);
	}

	/**
	 * Displays a generic admin message.
	 *
	 * @param string $message Admin message text.
	 * @param string $class   CSS class name for the admin notice.
	 */
	private function admin_message( $message, $class ) {
		echo '<div class="' . esc_attr( $class ) . '"><p>' . $message . '</p></div>';
	}
}