Members::ajax_invite_member( array $data )

	public function ajax_invite_member( $data ) {
		if ( empty( $data['userId'] ) || empty( $data['formId'] ) ) {
			return new WP_Error( 'missing_parameters', __( 'Missing request parameters.', 'torro-forms' ) );
		}

		$user = get_user_by( 'id', $data['userId'] );
		if ( ! $user || ! $user->exists() ) {
			return new WP_Error( 'cannot_find_user', __( 'Could not find user.', 'torro-forms' ) );
		}

		$form = $this->module->manager()->forms()->get( $data['formId'] );
		if ( ! $form ) {
			return new WP_Error( 'cannot_find_form', __( 'Could not find form.', 'torro-forms' ) );
		}

		$mode = $this->is_user_invited( (int) $user->ID, $form->id ) ? 'reinvitation' : 'invitation';

		$from_name  = $this->get_option( $mode . '_from_name', '{sitetitle}' );
		$from_email = $this->get_option( $mode . '_from_email', '{adminemail}' );
		$subject    = $this->get_option( $mode . '_subject', call_user_func( array( $this, 'get_default_' . $mode . '_subject' ) ) );
		$message    = $this->get_option( $mode . '_message', call_user_func( array( $this, 'get_default_' . $mode . '_message' ) ) );

		$from_name  = $this->template_tag_handler->process_content( $from_name, array( $form, $user ) );
		$from_email = $this->template_tag_handler_email_only->process_content( $from_email, array( $form, $user ) );
		$subject    = $this->template_tag_handler->process_content( $subject, array( $form, $user ) );
		$message    = $this->template_tag_handler->process_content( $message, array( $form, $user ) );

		$message = wpautop( $message );

		add_filter( 'wp_mail_content_type', array( $this, 'override_content_type' ) );
		add_filter( 'wp_mail_from_name', array( $this, 'override_from_name' ) );
		add_filter( 'wp_mail_from', array( $this, 'override_from_email' ) );

		$this->from_name  = $from_name;
		$this->from_email = $from_email;

		$result = wp_mail( $user->user_email, $subject, $message );

		$this->from_name = '';
		$this->from_email = '';

		remove_filter( 'wp_mail_content_type', array( $this, 'override_content_type' ) );
		remove_filter( 'wp_mail_from_name', array( $this, 'override_from_name' ) );
		remove_filter( 'wp_mail_from', array( $this, 'override_from_email' ) );

		if ( ! $result ) {
			if ( 'reinvitation' === $mode ) {
				/* translators: %s: user display name */
				return new WP_Error( 'cannot_reinvite_user', sprintf( __( 'User %s could not be reinvited.', 'torro-forms' ), $user->display_name ) );
			}

			/* translators: %s: user display name */
			return new WP_Error( 'cannot_invite_user', sprintf( __( 'User %s could not be invited.', 'torro-forms' ), $user->display_name ) );
		}

		$this->set_user_invited( (int) $user->ID, $form->id );

		if ( 'reinvitation' === $mode ) {
			return array(
				/* translators: %s: user display name */
				'message' => sprintf( __( 'User %s was successfully reinvited.', 'torro-forms' ), $user->display_name ),
			);
		}

		return array(
			/* translators: %s: user display name */
			'message' => sprintf( __( 'User %s was successfully invited.', 'torro-forms' ), $user->display_name ),
		);
	}