r > 0 ) {
			/* translators: 1. document type, 2. mark/unmark */
			wp_die( sprintf( esc_html__( 'Document of type %1$s for the selected order could not be %2$s as printed.', 'woocommerce-pdf-invoices-packing-slips' ), esc_attr( $data['document_type'] ), $event_type ) );
		}
	}
	
	/**
	 * Check if a document is printed
	 *
	 * @return bool
	 */
	public function is_document_printed( $document ) {
		$is_printed = false;
		
		if ( ! empty( $document ) && ! empty( $order = $document->order ) ) {
			if ( 'shop_order' === $order->get_type() && ! empty( $printed_data = $order->get_meta( "_wcpdf_{$document->slug}_printed" ) ) ) {	
				$is_printed = true;
			}
		}
		
		return $is_printed;
	}
	
	/**
	 * Check if a document can be manually marked as printed
	 *
	 * @return bool
	 */
	public function document_can_be_manually_marked_printed( $document ) {
		$can_be_manually_marked_printed = false;
		
		if ( empty( $document ) || ( property_exists( $document, 'is_bulk' ) && $document->is_bulk ) ) {
			return $can_be_manually_marked_printed;
		}
		
		$document->save_settings();
		
		$can_be_manually_marked_printed = false;
		$document_exists                = is_callable( array( $document, 'exists' ) ) ? $document->exists() : false;
		$document_printed               = $document_exists && is_callable( array( $document, 'printed' ) ) ? $document->printed() : false;
		$triggers                       = isset( $document->latest_settings['mark_printed'] ) && is_array( $document->latest_settings['mark_printed'] ) ? $document->latest_settings['mark_printed'] : [];
		$manually_print_enabled         = in_array( 'manually', $triggers ) ? true : false;
		
		if ( $document_exists && ! $document_printed && $manually_print_enabled ) {
			$can_be_manually_marked_printed = true;
		}
		
		return apply_filters( 'wpo_wcpdf_document_can_be_manually_marked_printed', $can_be_manually_marked_printed, $document );
	}
	
	/**
	 * Get document printed data
	 *
	 * @return array
	 */
	public function get_document_printed_data( $document ) {
		$data = [];
		
		if ( ! empty( $document ) && $this->is_document_printed( $document ) && ! empty( $order = $document->order ) ) {
			if ( 'shop_order' === $order->get_type() && ! empty( $printed_data = $order->get_meta( "_wcpdf_{$document->slug}_printed" ) ) ) {	
				$data = $printed_data;
			}
		}
		
		return apply_filters( 'wpo_wcpdf_document_printed_data', $data, $document );
	}

	/**
	 * Enable PHP error output
	 */
	public function enable_debug () {
		error_reporting( E_ALL );
		ini_set( 'display_errors', 1 );
	}

	public function wc_webhook_topic_hooks( $topic_hooks, $wc_webhook ) {
		$documents = WPO_WCPDF()->documents->get_documents();
		foreach ($documents as $document) {
			$topic_hooks["order.{$document->type}-saved"] = array(
				"wpo_wcpdf_webhook_order_{$document->slug}_saved",
			);
		}
		return $topic_hooks;
	}

	public function wc_webhook_topic_events( $topic_events ) {
		$documents = WPO_WCPDF()->documents->get_documents();
		foreach ($documents as $document) {
			$topic_events[] = "{$document->type}-saved";
		}
		return $topic_events;
	}

	public function wc_webhook_topics( $topics ) {
		$documents = WPO_WCPDF()->documents->get_documents();
		foreach ($documents as $document) {
			/* translators: document title */
			$topics["order.{$document->type}-saved"] = esc_html( sprintf( __( 'Order %s Saved', 'woocommerce-pdf-invoices-packing-slips' ), $document->get_title() ) );
		}
		return $topics;
	}

	public function wc_webhook_trigger( $document, $order ) {
		do_action( "wpo_wcpdf_webhook_order_{$document->slug}_saved", $order->get_id() );
	}

	/**
	 * @param null|string $document_type
	 * @param null|\WC_Order|\WC_Order_Refund $order
	 *
	 * @return void
	 */
	public function display_due_date( string $document_type = null, $order = null ): void {
		if ( empty( $order ) || empty( $document_type ) ) {
			return;
		}

		$document = wcpdf_get_document( $document_type, $order );

		if ( ! $document ) {
			return;
		}

		$due_date_timestamp = is_callable( array( $document, 'get_due_date' ) ) ? $document->get_due_date() : 0;

		if ( 0 >= $due_date_timestamp ) {
			return;
		}

		$due_date       = apply_filters( 'wpo_wcpdf_due_date_display', date_i18n( wcpdf_date_format( $this, 'due_date' ), $due_date_timestamp ), $due_date_timestamp, $document_type, $document );
		$due_date_title = is_callable( array( $document, 'get_due_date_title' ) ) ? $document->get_due_date_title() : __( 'Due Date:', 'woocommerce-pdf-invoices-packing-slips' );

		if ( ! empty( $due_date ) ) {
			echo '<tr class="due-date">
				<th>', $due_date_title, '</th>
				<td>', $due_date, '</td>
			</tr>';
		}
	}
}

endif; // class_exists