) ) {
			return new WP_Error(
				'rest_invalid_arguments',
				esc_html__( 'The arguments passed in are invalid.', 'jetpack-search-pkg' ),
				array( 'status' => 400 )
			);
		}
		return true;
	}

	/**
	 * GET `jetpack/v4/search/settings`
	 */
	public function get_settings() {
		return rest_ensure_response(
			array(
				'module_active'          => $this->search_module->is_active(),
				'instant_search_enabled' => $this->search_module->is_instant_search_enabled(),
			)
		);
	}

	/**
	 * Proxy the request to WPCOM and return the response.
	 *
	 * GET `jetpack/v4/search/stats`
	 */
	public function get_stats() {
		$response = ( new Stats() )->get_stats_from_wpcom();
		return $this->make_proper_response( $response );
	}

	/**
	 * Search Endpoint for private sites.
	 *
	 * GET `jetpack/v4/search`
	 *
	 * @param WP_REST_Request $request - REST request.
	 */
	public function get_search_results( $request ) {
		$blog_id  = $this->get_blog_id();
		$path     = sprintf( '/sites/%d/search', absint( $blog_id ) );
		$path     = add_query_arg(
			$request->get_query_params(),
			sprintf( '/sites/%d/search', absint( $blog_id ) )
		);
		$response = Client::wpcom_json_api_request_as_blog( $path, '1.3', array(), null, 'rest' );
		return rest_ensure_response( $this->make_proper_response( $response ) );
	}

	/**
	 * Activate plan: activate the search module, instant search and do initial configuration.
	 * Typically called from WPCOM.
	 *
	 * POST `jetpack/v4/search/plan/activate`
	 *
	 * @param WP_REST_Request $request - REST request.
	 */
	public function activate_plan( $request ) {
		$default_options = array(
			'search_plan_info'      => null,
			'enable_search'         => true,
			'enable_instant_search' => true,
			'auto_config_search'    => true,
		);
		$payload         = $request->get_json_params();
		$payload         = wp_parse_args( $payload, $default_options );

		// Update plan data, plan info is in the request body.
		// We do this to avoid another call to WPCOM and reduce latency.
		if ( $payload['search_plan_info'] === null || ! $this->plan->set_plan_options( $payload['search_plan_info'] ) ) {
			$this->plan->get_plan_info_from_wpcom();
		}

		// Enable search module by default, unless `enable_search` is explicitly set to boolean `false`.
		if ( false !== $payload['enable_search'] ) {
			// Eligibility is checked in `activate` function.
			$ret = $this->search_module->activate();
			if ( is_wp_error( $ret ) ) {
				return $ret;
			}
		}

		// Enable instant search by default, unless `enable_instant_search` is explicitly set to boolean `false`.
		if ( false !== $payload['enable_instant_search'] ) {
			// Eligibility is checked in `enable_instant_search` function.
			$ret = $this->search_module->enable_instant_search();
			if ( is_wp_error( $ret ) ) {
				return $ret;
			}
		}

		// Automatically configure necessary settings for instant search, unless `auto_config_search` is explicitly set to boolean `false`.
		if ( false !== $payload['auto_config_search'] ) {
			Instant_Search::instance( $this->get_blog_id() )->auto_config_search();
		}

		return rest_ensure_response(
			array(
				'code' => 'success',
			)
		);
	}

	/**
	 * Deactivate plan: turn off search module and instant search.
	 * If the plan is still valid then the function would simply deactivate the search module.
	 * Typically called from WPCOM.
	 *
	 * POST `jetpack/v4/search/plan/deactivate`
	 */
	public function deactivate_plan() {
		// Instant Search would be disabled along with search module.
		$this->search_module->deactivate();
		return rest_ensure_response(
			array(
				'code' => 'success',
			)
		);
	}

	/**
	 * Return post type breakdown for the site.
	 */
	public function get_local_stats() {
		return array(
			'post_count'          => Search_Product_Stats::estimate_count(),
			'post_type_breakdown' => Search_Product_Stats::get_post_type_breakdown(),
		);
	}

	/**
	 * Pricing for record count of the site
	 */
	public function product_pricing() {
		$tier_pricing = Search_Product::get_pricing_for_ui();
		// we can force the plugin to use the new pricing by appending `new_pricing_202208=1` to URL.
		if ( Helper::is_forced_new_pricing_202208() ) {
			$tier_pricing['pricing_version'] = Plan::JETPACK_SEARCH_NEW_PRICING_VERSION;
		}
		return rest_ensure_response( $tier_pricing );
	}

	/**
	 * Forward remote response to client with error handling.
	 *
	 * @param array|WP_Error $response - Response from WPCOM.
	 */
	protected function make_proper_response( $response ) {
		if ( is_wp_error( $response ) ) {
			return $response;
		}

		$body        = json_decode( wp_remote_retrieve_body( $response ), true );
		$status_code = wp_remote_retrieve_response_code( $response );

		if ( 200 === $status_code ) {
			return $body;
		}

		return new WP_Error(
			isset( $body['error'] ) ? 'remote-error-' . $body['error'] : 'remote-error',
			isset( $body['message'] ) ? $body['message'] : 'unknown remote error',
			array( 'status' => $status_code )
		);
	}

	/**
	 * Get blog id
	 */
	protected function get_blog_id() {
		return $this->is_wpcom ? get_current_blog_id() : Jetpack_Options::get_option( 'id' );
	}
}