*/
	public function expand_theme_data() {
		return array( $this->get_theme_info() );
	}

	/**
	 * Retrieve the name of the widget by the widget ID.
	 *
	 * @access public
	 * @global $wp_registered_widgets
	 *
	 * @param string $widget_id Widget ID.
	 * @return string Name of the widget, or null if not found.
	 */
	public function get_widget_name( $widget_id ) {
		global $wp_registered_widgets;
		return ( isset( $wp_registered_widgets[ $widget_id ] ) ? $wp_registered_widgets[ $widget_id ]['name'] : null );
	}

	/**
	 * Retrieve the name of the sidebar by the sidebar ID.
	 *
	 * @access public
	 * @global $wp_registered_sidebars
	 *
	 * @param string $sidebar_id Sidebar ID.
	 * @return string Name of the sidebar, or null if not found.
	 */
	public function get_sidebar_name( $sidebar_id ) {
		global $wp_registered_sidebars;
		return ( isset( $wp_registered_sidebars[ $sidebar_id ] ) ? $wp_registered_sidebars[ $sidebar_id ]['name'] : null );
	}

	/**
	 * Sync addition of widgets to a sidebar.
	 *
	 * @access public
	 *
	 * @param array  $new_widgets New widgets.
	 * @param array  $old_widgets Old widgets.
	 * @param string $sidebar     Sidebar ID.
	 * @return array All widgets that have been moved to the sidebar.
	 */
	public function sync_add_widgets_to_sidebar( $new_widgets, $old_widgets, $sidebar ) {
		$added_widgets = array_diff( $new_widgets, $old_widgets );
		if ( empty( $added_widgets ) ) {
			return array();
		}
		$moved_to_sidebar = array();
		$sidebar_name     = $this->get_sidebar_name( $sidebar );

		// Don't sync jetpack_widget_added if theme was switched.
		if ( $this->is_theme_switch() ) {
			return array();
		}

		foreach ( $added_widgets as $added_widget ) {
			$moved_to_sidebar[] = $added_widget;
			$added_widget_name  = $this->get_widget_name( $added_widget );
			/**
			 * Helps Sync log that a widget got added
			 *
			 * @since 4.9.0
			 *
			 * @param string $sidebar, Sidebar id got changed
			 * @param string $added_widget, Widget id got added
			 * @param string $sidebar_name, Sidebar id got changed Since 5.0.0
			 * @param string $added_widget_name, Widget id got added Since 5.0.0
			 */
			do_action( 'jetpack_widget_added', $sidebar, $added_widget, $sidebar_name, $added_widget_name );
		}
		return $moved_to_sidebar;
	}

	/**
	 * Sync removal of widgets from a sidebar.
	 *
	 * @access public
	 *
	 * @param array  $new_widgets      New widgets.
	 * @param array  $old_widgets      Old widgets.
	 * @param string $sidebar          Sidebar ID.
	 * @param array  $inactive_widgets Current inactive widgets.
	 * @return array All widgets that have been moved to inactive.
	 */
	public function sync_remove_widgets_from_sidebar( $new_widgets, $old_widgets, $sidebar, $inactive_widgets ) {
		$removed_widgets = array_diff( $old_widgets, $new_widgets );

		if ( empty( $removed_widgets ) ) {
			return array();
		}

		$moved_to_inactive = array();
		$sidebar_name      = $this->get_sidebar_name( $sidebar );

		foreach ( $removed_widgets as $removed_widget ) {
			// Lets check if we didn't move the widget to in_active_widgets.
			if ( isset( $inactive_widgets ) && ! in_array( $removed_widget, $inactive_widgets, true ) ) {
				$removed_widget_name = $this->get_widget_name( $removed_widget );
				/**
				 * Helps Sync log that a widgte got removed
				 *
				 * @since 4.9.0
				 *
				 * @param string $sidebar, Sidebar id got changed
				 * @param string $removed_widget, Widget id got removed
				 * @param string $sidebar_name, Name of the sidebar that changed  Since 5.0.0
				 * @param string $removed_widget_name, Name of the widget that got removed Since 5.0.0
				 */
				do_action( 'jetpack_widget_removed', $sidebar, $removed_widget, $sidebar_name, $removed_widget_name );
			} else {
				$moved_to_inactive[] = $removed_widget;
			}
		}
		return $moved_to_inactive;

	}

	/**
	 * Sync a reorder of widgets within a sidebar.
	 *
	 * @access public
	 *
	 * @todo Refactor serialize() to a json_encode().
	 *
	 * @param array  $new_widgets New widgets.
	 * @param array  $old_widgets Old widgets.
	 * @param string $sidebar     Sidebar ID.
	 */
	public function sync_widgets_reordered( $new_widgets, $old_widgets, $sidebar ) {
		$added_widgets = array_diff( $new_widgets, $old_widgets );
		if ( ! empty( $added_widgets ) ) {
			return;
		}
		$removed_widgets = array_diff( $old_widgets, $new_widgets );
		if ( ! empty( $removed_widgets ) ) {
			return;
		}

		// phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.serialize_serialize
		if ( serialize( $old_widgets ) !== serialize( $new_widgets ) ) {
			$sidebar_name = $this->get_sidebar_name( $sidebar );
			/**
			 * Helps Sync log that a sidebar id got reordered
			 *
			 * @since 4.9.0
			 *
			 * @param string $sidebar, Sidebar id got changed
			 * @param string $sidebar_name, Name of the sidebar that changed  Since 5.0.0
			 */
			do_action( 'jetpack_widget_reordered', $sidebar, $sidebar_name );
		}

	}

	/**
	 * Handle the update of the sidebars and widgets mapping option.
	 *
	 * @access public
	 *
	 * @param mixed $old_value The old option value.
	 * @param mixed $new_value The new option value.
	 */
	public function sync_sidebar_widgets_actions( $old_value, $new_value ) {
		// Don't really know how to deal with different array_values yet.
		if (
			( isset( $old_value['array_version'] ) && 3 !== $old_value['array_version'] ) ||
			( isset( $new_value['array_version'] ) && 3 !== $new_value['array_version'] )
		) {
			return;
		}

		$moved_to_inactive_ids = array();
		$moved_to_sidebar      = array();

		foreach ( $new_value as $sidebar => $new_widgets ) {
			if ( in_array( $sidebar, array( 'array_version', 'wp_inactive_widgets' ), true ) ) {
				continue;
			}
			$old_widgets = isset( $old_value[ $sidebar ] )
				? $old_value[ $sidebar ]
				: array();

			if ( ! is_array( $new_widgets ) ) {
				$new_widgets = array();
			}

			$moved_to_inactive_recently = $this->sync_remove_widgets_from_sidebar( $new_widgets, $old_widgets, $sidebar, $new_value['wp_inactive_widgets'] );
			$moved_to_inactive_ids      = array_merge( $moved_to_inactive_ids, $moved_to_inactive_recently );

			$moved_to_sidebar_recently = $this->sync_add_widgets_to_sidebar( $new_widgets, $old_widgets, $sidebar );
			$moved_to_sidebar          = array_merge( $moved_to_sidebar, $moved_to_sidebar_recently );

			$this->sync_widgets_reordered( $new_widgets, $old_widgets, $sidebar );

		}

		// Don't sync either jetpack_widget_moved_to_inactive or jetpack_cleared_inactive_widgets if theme was switched.
		if ( $this->is_theme_switch() ) {
			return;
		}

		// Treat inactive sidebar a bit differently.
		if ( ! empty( $moved_to_inactive_ids ) ) {
			$moved_to_inactive_name = array_map( array( $this, 'get_widget_name' ), $moved_to_inactive_ids );
			/**
			 * Helps Sync log that a widgets IDs got moved to in active
			 *
			 * @since 4.9.0
			 *
			 * @param array $moved_to_inactive_ids, Array of widgets id that moved to inactive id got changed
			 * @param array $moved_to_inactive_names, Array of widgets names that moved to inactive id got changed Since 5.0.0
			 */
			do_action( 'jetpack_widget_moved_to_inactive', $moved_to_inactive_ids, $moved_to_inactive_name );
		} elseif ( empty( $moved_to_sidebar ) && empty( $new_value['wp_inactive_widgets'] ) && ! empty( $old_value['wp_inactive_widgets'] ) ) {
			/**
			 * Helps Sync log that a got cleared from inactive.
			 *
			 * @since 4.9.0
			 */
			do_action( 'jetpack_cleared_inactive_widgets' );
		}
	}

	/**
	 * Retrieve the theme data for the current or a specific theme.
	 *
	 * @access private
	 *
	 * @param \WP_Theme $theme Theme object. Optional, will default to the current theme.
	 *
	 * @return array Theme data.
	 */
	private function get_theme_info( $theme = null ) {
		$theme_support = array();

		// We are trying to get the current theme info.
		if ( null === $theme ) {
			$theme = wp_get_theme();
		}

		$theme_support['name']    = $theme->get( 'Name' );
		$theme_support['version'] = $theme->get( 'Version' );
		$theme_support['slug']    = $theme->get_stylesheet();
		$theme_support['uri']     = $theme->get( 'ThemeURI' );

		return $theme_support;
	}

	/**
	 * Whether we've deleted a theme in the current request.
	 *
	 * @access private
	 *
	 * @return boolean True if this is a theme deletion request, false otherwise.
	 */
	private function get_delete_theme_call() {
		// Intentional usage of `debug_backtrace()` for production needs.
		// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_debug_backtrace
		$backtrace         = debug_backtrace();
		$delete_theme_call = null;
		foreach ( $backtrace as $call ) {
			if ( isset( $call['function'] ) && 'delete_theme' === $call['function'] ) {
				$delete_theme_call = $call;
				break;
			}
		}
		return $delete_theme_call;
	}

	/**
	 * Whether we've switched to another theme in the current request.
	 *
	 * @access private
	 *
	 * @return boolean True if this is a theme switch request, false otherwise.
	 */
	private function is_theme_switch() {
		return did_action( 'after_switch_theme' );
	}

	/**
	 * Return Total number of objects.
	 *
	 * @param array $config Full Sync config.
	 *
	 * @return int total
	 */
	public function total( $config ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
		return 1;
	}

}