this->fetch_stats( $args );
	}

	/**
	 * Get the highlights for the site.
	 *
	 * @link https://developer.wordpress.com/docs/api/1.1/get/sites/%24site/stats/highlights/
	 *
	 * @param array $args Optional query parameters.
	 * @return array|WP_Error
	 */
	public function get_highlights( $args = array() ) {

		$this->resource = 'highlights';

		return $this->fetch_stats( $args );
	}

	/**
	 * Get the number of visits for the site.
	 *
	 * @param array $args Optional query parameters.
	 * @return array|WP_Error
	 */
	public function get_insights( $args = array() ) {

		$this->resource = 'insights';

		return $this->fetch_stats( $args );
	}

	/**
	 * Build WPCOM REST API endpoint.
	 *
	 * @return string
	 */
	protected function build_endpoint() {
		$resource = ltrim( $this->resource, '/' );

		return sprintf( '/sites/%d/stats/%s', Jetpack_Options::get_option( 'id' ), $resource );
	}

	/**
	 * Fetches stats data from WPCOM or local Cache. Caches locally for 5 minutes.
	 *
	 * @param array $args Optional query parameters.
	 *
	 * @return array|WP_Error
	 */
	protected function fetch_stats( $args = array() ) {
		$endpoint       = $this->build_endpoint();
		$api_version    = self::STATS_REST_API_VERSION;
		$cache_key      = md5( implode( '|', array( $endpoint, $api_version, wp_json_encode( $args ) ) ) );
		$transient_name = self::STATS_CACHE_TRANSIENT_PREFIX . $cache_key;
		$stats_cache    = get_transient( $transient_name );

		if ( $stats_cache ) {
			$time = key( $stats_cache );
			$data = $stats_cache[ $time ]; // WP_Error or string (JSON encoded object).

			if ( is_wp_error( $data ) ) {
				return $data;
			}

			return array_merge( array( 'cached_at' => $time ), (array) json_decode( $data, true ) );
		}

		$wpcom_stats = $this->fetch_remote_stats( $endpoint, $args );

		// To reduce size in storage: store with time as key, store JSON encoded data.
		$cached_value = is_wp_error( $wpcom_stats ) ? $wpcom_stats : wp_json_encode( $wpcom_stats );
		$expiration   = self::STATS_CACHE_EXPIRATION_IN_MINUTES * MINUTE_IN_SECONDS;
		set_transient( $transient_name, array( time() => $cached_value ), $expiration );

		return $wpcom_stats;
	}

	/**
	 * Fetches stats data from WPCOM.
	 *
	 * @link https://developer.wordpress.com/docs/api/1.1/get/sites/%24site/stats/
	 * @param string $endpoint The stats endpoint.
	 * @param array  $args The query arguments.
	 * @return array|WP_Error.
	 */
	protected function fetch_remote_stats( $endpoint, $args ) {
		if ( is_array( $args ) && ! empty( $args ) ) {
			$endpoint .= '?' . http_build_query( $args );
		}
		$response      = Client::wpcom_json_api_request_as_blog( $endpoint, self::STATS_REST_API_VERSION, array( 'timeout' => 20 ) );
		$response_code = wp_remote_retrieve_response_code( $response );
		$response_body = wp_remote_retrieve_body( $response );

		if ( is_wp_error( $response ) || 200 !== $response_code || empty( $response_body ) ) {
			return is_wp_error( $response ) ? $response : new WP_Error( 'stats_error', 'Failed to fetch Stats from WPCOM' );
		}

		return json_decode( $response_body, true );
	}
}