cation_to_array' ], $notifications );

		// Save the notifications to the storage.
		update_option( $this->storage_key, $notifications );
	}

	/**
	 * Dismiss persistent notice.
	 *
	 * @codeCoverageIgnore
	 */
	public function notice_dismissible() {
		$notification_id = filter_input( INPUT_POST, 'notificationId' );
		check_ajax_referer( $notification_id, 'security' );

		$notification = $this->remove_by_id( $notification_id );

		/**
		 * Filter: 'wp_helpers_notification_dismissed' - Allows developer to perform action after dismissed.
		 *
		 * @param Notification[] $notifications
		 */
		do_action( 'wp_helpers_notification_dismissed', $notification_id, $notification );
	}

	/**
	 * Add notification
	 *
	 * @param string $message Message string.
	 * @param array  $options Set of options.
	 */
	public function add( $message, $options = [] ) {
		if ( isset( $options['id'] ) && ! is_null( $this->get_notification_by_id( $options['id'] ) ) ) {
			return;
		}

		$this->notifications[] = new Notification(
			$message,
			$options
		);
	}

	/**
	 * Provide a way to verify present notifications
	 *
	 * @return array|Notification[] Registered notifications.
	 */
	public function get_notifications() {
		return $this->notifications;
	}

	/**
	 * Get the notification by ID
	 *
	 * @param  string $notification_id The ID of the notification to search for.
	 * @return null|Notification
	 */
	public function get_notification_by_id( $notification_id ) {
		foreach ( $this->notifications as $notification ) {
			if ( $notification_id === $notification->args( 'id' ) ) {
				return $notification;
			}
		}
		return null;
	}

	/**
	 * Remove the notification by ID
	 *
	 * @codeCoverageIgnore
	 *
	 * @param string $notification_id The ID of the notification to search for.
	 * @return Notification Instance of delete notification.
	 */
	public function remove_by_id( $notification_id ) {
		$notification = $this->get_notification_by_id( $notification_id );
		if ( ! is_null( $notification ) ) {
			$notification->dismiss();
		}

		return $notification;
	}

	/**
	 * Remove notification after it has been displayed.
	 *
	 * @codeCoverageIgnore
	 *
	 * @param Notification $notification Notification to remove.
	 */
	public function remove_notification( Notification $notification ) {
		if ( ! $notification->is_displayed() ) {
			return true;
		}

		if ( $notification->is_persistent() ) {
			return true;
		}

		return false;
	}

	/**
	 * Return the notifications sorted on type and priority
	 *
	 * @codeCoverageIgnore
	 *
	 * @return array|Notification[] Sorted Notifications
	 */
	private function get_sorted_notifications() {
		$notifications = $this->get_notifications();
		if ( empty( $notifications ) ) {
			return [];
		}

		// Sort by severity, error first.
		usort( $notifications, [ $this, 'sort_notifications' ] );

		return $notifications;
	}

	/**
	 * Sort on type then priority
	 *
	 * @codeCoverageIgnore
	 *
	 * @param  Notification $first  Compare with B.
	 * @param  Notification $second Compare with A.
	 * @return int 1, 0 or -1 for sorting offset.
	 */
	private function sort_notifications( Notification $first, Notification $second ) {

		if ( 'error' === $first->args( 'type' ) ) {
			return -1;
		}

		if ( 'error' === $second->args( 'type' ) ) {
			return 1;
		}

		return 0;
	}

	/**
	 * Convert Notification to array representation
	 *
	 * @codeCoverageIgnore
	 *
	 * @param  Notification $notification Notification to convert.
	 * @return array
	 */
	private function notification_to_array( Notification $notification ) {
		return $notification->to_array();
	}

	/**
	 * Check if is network admin.
	 *
	 * @codeCoverageIgnore
	 *
	 * @return bool
	 */
	private function is_network_admin() {
		return function_exists( 'is_network_admin' ) && is_network_admin();
	}

	/**
	 * Check if a notification with the given ID exists.
	 *
	 * @param string $id Notification ID.
	 * @return boolean
	 */
	public function has_notification( $id ) {
		$notifications = $this->get_notifications();
		foreach ( $notifications as $notification ) {
			if ( isset( $notification->options['id'] ) && $notification->options['id'] === $id ) {
				return true;
			}
		}
		return false;
	}
}