d( $form_data['_wcpdf_'.$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