rn;
		}

		if ( ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_GET['_wpnonce'] ?? '' ) ), 'hpos-sync-now' ) ) {
			WC_Admin_Settings::add_error( esc_html__( 'Unable to start synchronization. The link you followed may have expired.', 'woocommerce' ) );
			return;
		}

		$this->data_cleanup->toggle_flag( false );
		$this->batch_processing_controller->enqueue_processor( DataSynchronizer::class );
	}

	/**
	 * Tell WP Admin to remove the sync query arg from the URL.
	 *
	 * @param array $query_args The query args that are removable.
	 *
	 * @return array
	 */
	private function register_removable_query_arg( $query_args ) {
		$query_args[] = self::SYNC_QUERY_ARG;

		return $query_args;
	}

	/**
	 * Handler for the woocommerce_after_register_post_type post,
	 * registers the post type for placeholder orders.
	 *
	 * @return void
	 */
	private function register_post_type_for_order_placeholders(): void {
		wc_register_order_type(
			DataSynchronizer::PLACEHOLDER_ORDER_POST_TYPE,
			array(
				'public'                           => false,
				'exclude_from_search'              => true,
				'publicly_queryable'               => false,
				'show_ui'                          => false,
				'show_in_menu'                     => false,
				'show_in_nav_menus'                => false,
				'show_in_admin_bar'                => false,
				'show_in_rest'                     => false,
				'rewrite'                          => false,
				'query_var'                        => false,
				'can_export'                       => false,
				'supports'                         => array(),
				'capabilities'                     => array(),
				'exclude_from_order_count'         => true,
				'exclude_from_order_views'         => true,
				'exclude_from_order_reports'       => true,
				'exclude_from_order_sales_reports' => true,
			)
		);
	}

	/**
	 * Add the definition for the HPOS feature.
	 *
	 * @param FeaturesController $features_controller The instance of FeaturesController.
	 *
	 * @return void
	 */
	private function add_feature_definition( $features_controller ) {
		$definition = array(
			'option_key'          => self::CUSTOM_ORDERS_TABLE_USAGE_ENABLED_OPTION,
			'is_experimental'     => false,
			'enabled_by_default'  => false,
			'order'               => 50,
			'setting'             => $this->get_hpos_setting_for_feature(),
			'additional_settings' => array(
				$this->get_hpos_setting_for_sync(),
			),
		);

		$features_controller->add_feature_definition(
			'custom_order_tables',
			__( 'High-Performance order storage', 'woocommerce' ),
			$definition
		);
	}

	/**
	 * Returns the HPOS setting for rendering HPOS vs Post setting block in Features section of the settings page.
	 *
	 * @return array Feature setting object.
	 */
	private function get_hpos_setting_for_feature() {
		if ( 'yes' === get_transient( 'wc_installing' ) ) {
			return array();
		}

		$get_value = function() {
			return $this->custom_orders_table_usage_is_enabled() ? 'yes' : 'no';
		};

		/**
		 * ⚠️The FeaturesController instance must only be accessed from within the callback functions. Otherwise it
		 * gets called while it's still being instantiated and creates and endless loop.
		 */

		$get_desc = function() {
			$plugin_compatibility = $this->features_controller->get_compatible_plugins_for_feature( 'custom_order_tables', true );

			return $this->plugin_util->generate_incompatible_plugin_feature_warning( 'custom_order_tables', $plugin_compatibility );
		};

		$get_disabled = function() {
			$plugin_compatibility = $this->features_controller->get_compatible_plugins_for_feature( 'custom_order_tables', true );
			$sync_complete        = 0 === $this->get_orders_pending_sync_count();
			$disabled             = array();
			// Changing something here? might also want to look at `enable|disable` functions in CLIRunner.
			if ( count( array_merge( $plugin_compatibility['uncertain'], $plugin_compatibility['incompatible'] ) ) > 0 ) {
				$disabled = array( 'yes' );
			}
			if ( ! $sync_complete && ! $this->changing_data_source_with_sync_pending_is_allowed() ) {
				$disabled = array( 'yes', 'no' );
			}

			return $disabled;
		};

		return array(
			'id'          => self::CUSTOM_ORDERS_TABLE_USAGE_ENABLED_OPTION,
			'title'       => __( 'Order data storage', 'woocommerce' ),
			'type'        => 'radio',
			'options'     => array(
				'no'  => __( 'WordPress posts storage (legacy)', 'woocommerce' ),
				'yes' => __( 'High-performance order storage (recommended)', 'woocommerce' ),
			),
			'value'       => $get_value,
			'disabled'    => $get_disabled,
			'desc'        => $get_desc,
			'desc_at_end' => true,
			'row_class'   => self::CUSTOM_ORDERS_TABLE_USAGE_ENABLED_OPTION,
		);
	}

	/**
	 * Returns the setting for rendering sync enabling setting block in Features section of the settings page.
	 *
	 * @return array Feature setting object.
	 */
	private function get_hpos_setting_for_sync() {
		if ( 'yes' === get_transient( 'wc_installing' ) ) {
			return array();
		}

		$get_value = function() {
			return get_option( DataSynchronizer::ORDERS_DATA_SYNC_ENABLED_OPTION );
		};

		$get_sync_message = function() {
			$orders_pending_sync_count = $this->get_orders_pending_sync_count();
			$sync_in_progress          = $this->batch_processing_controller->is_enqueued( get_class( $this->data_synchronizer ) );
			$sync_enabled              = $this->data_synchronizer->data_sync_is_enabled();
			$sync_is_pending           = $orders_pending_sync_count > 0;
			$sync_message              = array();

			$is_dangerous = $sync_is_pending && $this->changing_data_source_with_sync_pending_is_allowed();

			if ( $is_dangerous ) {
				$sync_message[] = wp_kses_data(
					sprintf(
					// translators: %d: number of pending orders.
						_n(
							"There's %d order pending sync. <b>Switching data storage while sync is incomplete is dangerous and can lead to order data corruption or loss!</b>",
							'There are %d orders pending sync. <b>Switching data storage while sync is incomplete is dangerous and can lead to order data corruption or loss!</b>',
							$orders_pending_sync_count,
							'woocommerce'
						),
						$orders_pending_sync_count,
					)
				);
			}

			if ( ! $sync_enabled && $this->data_synchronizer->background_sync_is_enabled() ) {
				$sync_message[] = __( 'Background sync is enabled.', 'woocommerce' );
			}

			if ( $sync_in_progress && $sync_is_pending ) {
				$sync_message[] = sprintf(
					// translators: %d: number of pending orders.
					__( 'Currently syncing orders... %d pending', 'woocommerce' ),
					$orders_pending_sync_count
				);
			} elseif ( $sync_is_pending ) {
				$sync_now_url = wp_nonce_url(
					add_query_arg(
						array(
							self::SYNC_QUERY_ARG => true,
						),
						wc_get_container()->get( FeaturesController::class )->get_features_page_url()
					),
					'hpos-sync-now'
				);

				if ( ! $is_dangerous ) {
					$sync_message[] = wp_kses_data(
						sprintf(
						// translators: %d: number of pending orders.
							_n(
								"There's %d order pending sync. You can switch order data storage <strong>only when the posts and orders tables are in sync</strong>.",
								'There are %d orders pending sync. You can switch order data storage <strong>only when the posts and orders tables are in sync</strong>.',
								$orders_pending_sync_count,
								'woocommerce'
							),
							$orders_pending_sync_count
						)
					);
				}

				$sync_message[] = sprintf(
					'<a href="%1$s" class="button button-link">%2$s</a>',
					esc_url( $sync_now_url ),
					sprintf(
						// translators: %d: number of pending orders.
						_n(
							'Sync %s pending order',
							'Sync %s pending orders',
							$orders_pending_sync_count,
							'woocommerce'
						),
						number_format_i18n( $orders_pending_sync_count )
					)
				);
			}

			return implode( '<br />', $sync_message );
		};

		$get_description_is_error = function() {
			$sync_is_pending = $this->get_orders_pending_sync_count() > 0;

			return $sync_is_pending && $this->changing_data_source_with_sync_pending_is_allowed();
		};

		return array(
			'id'                   => DataSynchronizer::ORDERS_DATA_SYNC_ENABLED_OPTION,
			'title'                => '',
			'type'                 => 'checkbox',
			'desc'                 => __( 'Enable compatibility mode (synchronizes orders to the posts table).', 'woocommerce' ),
			'value'                => $get_value,
			'desc_tip'             => $get_sync_message,
			'description_is_error' => $get_description_is_error,
			'row_class'            => DataSynchronizer::ORDERS_DATA_SYNC_ENABLED_OPTION,
		);
	}

	/**
	 * Returns a value indicating if changing the authoritative data source for orders while there are orders pending synchronization is allowed.
	 *
	 * @return bool
	 */
	private function changing_data_source_with_sync_pending_is_allowed(): bool {
		/**
		 * Filter to allow changing where order data is stored, even when there are orders pending synchronization.
		 *
		 * DANGER! This filter is intended for usage when doing manual and automated testing in development environments only,
		 * it should NEVER be used in production environments. Order data corruption or loss can happen!
		 *
		 * @param bool $allow True to allow changing order storage when there are orders pending synchronization, false to disallow.
		 * @returns bool
		 *
		 * @since 8.3.0
		 */
		return apply_filters( 'wc_allow_changing_orders_storage_while_sync_is_pending', false );
	}

	/**
	 * Returns the count of orders pending synchronization.
	 *
	 * @return int
	 */
	private function get_orders_pending_sync_count(): int {
		return $this->data_synchronizer->get_sync_status()['current_pending_count'];
	}
}
<br />
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