empty( $document ) ) {

				// perform legacy date fields replacements check
				if( isset( $form_data["_wcpdf_{$document->slug}_date"] ) && ! is_array( $form_data["_wcpdf_{$document->slug}_date"] ) ) {
					$form_data = $this->legacy_date_fields_replacements( $form_data, $document->slug );
				}

				// save document data
				$document_data = $this->process_order_document_form_data( $form_data, $document->slug );

				// on regenerate
				if( $action_type == 'regenerate' && $document->exists() ) {
					$document->regenerate( $order, $document_data );
					WPO_WCPDF()->main->log_document_creation_trigger_to_order_meta( $document, 'document_data', true );
					$response = array(
						'message' => $notice_messages[$notice]['success'],
					);

				// on delete
				} elseif( $action_type == 'delete' && $document->exists() ) {
					$document->delete();

					$response = array(
						'message' => $notice_messages[$notice]['success'],
					);

				// on save
				} elseif( $action_type == 'save' ) {
					$is_new = false === $document->exists();
					$document->set_data( $document_data, $order );

					// check if we have number, and if not generate one
					if( $document->get_date() && ! $document->get_number() && is_callable( array( $document, 'init_number' ) ) ) {
						$document->init_number();
					}

					$document->save();

					if ( $is_new ) {
						WPO_WCPDF()->main->log_document_creation_to_order_notes( $document, 'document_data' );
						WPO_WCPDF()->main->log_document_creation_trigger_to_order_meta( $document, 'document_data' );
						WPO_WCPDF()->main->mark_document_printed( $document, 'document_data' );
					}
					$response      = array(
						'message' => $notice_messages[$notice]['success'],
					);

				// document not exist
				} else {
					$message_complement = __( 'Document does not exist.', 'woocommerce-pdf-invoices-packing-slips' );
					wp_send_json_error( array(
						'message' => wp_kses_post( $notice_messages[$notice]['error'] . ' ' . $message_complement ),
					) );
				}

				// clean/escape response message
				if ( ! empty( $response['message'] ) ) {
					$response['message'] = wp_kses_post( $response['message'] );
				}

				wp_send_json_success( $response );

			} else {
				$message_complement = __( 'Document is empty.', 'woocommerce-pdf-invoices-packing-slips' );
				wp_send_json_error( array(
					'message' => wp_kses_post( $notice_messages[$notice]['error'] . ' ' . $message_complement ),
				) );
			}
		} catch ( \Throwable $e ) {
			wp_send_json_error( array(
				'message' => wp_kses_post( $notice_messages[$notice]['error'] . ' ' . $e->getMessage() ),
			) );			
		}
	}

	public function legacy_date_fields_replacements( $form_data, $document_slug ) {
		$legacy_date   = sanitize_text_field( $form_data["_wcpdf_{$document_slug}_date"] );
		$legacy_hour   = sanitize_text_field( $form_data["_wcpdf_{$document_slug}_date_hour"] );
		$legacy_minute = sanitize_text_field( $form_data["_wcpdf_{$document_slug}_date_minute"] );
		unset( $form_data["_wcpdf_{$document_slug}_date_hour"] );
		unset( $form_data["_wcpdf_{$document_slug}_date_minute"] );

		$form_data["_wcpdf_{$document_slug}_date"] = array(
			'date'   => $legacy_date,
			'hour'   => $legacy_hour,
			'minute' => $legacy_minute,
		);

		return $form_data;
	}

	public function debug_enabled_warning( $wp_admin_bar ) {
		if ( isset(WPO_WCPDF()->settings->debug_settings['enable_debug']) && current_user_can( 'administrator' ) ) {
			$status_settings_url = 'admin.php?page=wpo_wcpdf_options_page&tab=debug';
			$title = __( 'DEBUG output enabled', 'woocommerce-pdf-invoices-packing-slips' );
			$args = array(
				'id'    => 'admin_bar_wpo_debug_mode',
				'title' => sprintf( '<a href="%s" style="background-color: red; color: white;">%s</a>', esc_attr( $status_settings_url ), esc_html( $title ) ),
			);
			$wp_admin_bar->add_node( $args );
		}
	}

	public function process_order_document_form_data( $form_data, $document_slug )
	{
		$data = array();

		if( isset( $form_data['_wcpdf_'.$document_slug.'_number'] ) ) {
			$data['number'] = sanitize_text_field( $form_data['_wcpdf_'.$document_slug.'_number'] );
		}

		$date_entered = ! empty( $form_data['_wcpdf_'.$document_slug.'_date'] ) && ! empty( $form_data['_wcpdf_'.$document_slug.'_date']['date'] );
		if( $date_entered ) {
			$date         = $form_data['_wcpdf_'.$document_slug.'_date']['date'];
			$hour         = ! empty( $form_data['_wcpdf_'.$document_slug.'_date']['hour'] ) ? $form_data['_wcpdf_'.$document_slug.'_date']['hour'] : '00';
			$minute       = ! empty( $form_data['_wcpdf_'.$document_slug.'_date']['minute'] ) ? $form_data['_wcpdf_'.$document_slug.'_date']['minute'] : '00';

			// clean & sanitize input
			$date         = date( 'Y-m-d', strtotime( $date ) );
			$hour         = sprintf('%02d', intval( $hour ));
			$minute       = sprintf('%02d', intval( $minute ) );
			$data['date'] = "{$date} {$hour}:{$minute}:00";

		} elseif ( ! $date_entered && !empty( $_POST['_wcpdf_'.$document_slug.'_number'] ) ) {
			$data['date'] = current_time( 'timestamp', true );
		}

		if ( isset( $form_data['_wcpdf_'.$document_slug.'_notes'] ) ) {
			// allowed HTML
			$allowed_html = array(
				'a'		=> array(
					'href' 	=> array(),
					'title' => array(),
					'id' 	=> array(),
					'class'	=> array(),
					'style'	=> array(),
				),
				'br'	=> array(),
				'em'	=> array(),
				'strong'=> array(),
				'div'	=> array(
					'id'	=> array(),
					'class' => array(),
					'style'	=> array(),
				),
				'span'	=> array(
					'id' 	=> array(),
					'class'	=> array(),
					'style'	=> array(),
				),
				'p'		=> array(
					'id' 	=> array(),
					'class' => array(),
					'style' => array(),
				),
				'b'		=> array(),
			);
			
			$data['notes'] = wp_kses( $form_data['_wcpdf_'.$document_slug.'_notes'], $allowed_html );
		}

		return $data;
	}

	public function add_invoice_number_to_order_report( $response ) {
		$order = wc_get_order( $response->data['order_id'] );
		if ( ! empty( $order ) ) {
			$response->data['invoice_number'] = $order->get_meta( '_wcpdf_invoice_number' );
		}

		return $response;
	}

	public function add_invoice_number_header_to_order_export( $export_columns ) {
		$export_columns['invoice_number'] = __( 'Invoice Number', 'woocommerce-pdf-invoices-packing-slips' );

		return $export_columns;
	}

	public function add_invoice_number_value_to_order_export( $export_item, $item ) {
		if ( ! empty( $item['invoice_number'] ) ) {
			$export_item['invoice_number'] = $item['invoice_number'];
		}

		return $export_item;
	}
}

endif; // class_exists