<?php

use Automattic\Jetpack\Connection\Manager;

class Jetpack_Heartbeat {

	/**
	 * Holds the singleton instance of this class
	 *
	 * @since 2.3.3
	 * @var Jetpack_Heartbeat
	 */
	private static $instance = false;

	private $cron_name = 'jetpack_v2_heartbeat';

	/**
	 * Singleton
	 *
	 * @since 2.3.3
	 * @static
	 * @return Jetpack_Heartbeat
	 */
	public static function init() {
		if ( ! self::$instance ) {
			self::$instance = new Jetpack_Heartbeat();
		}

		return self::$instance;
	}

	/**
	 * Constructor for singleton
	 *
	 * @since 2.3.3
	 * @return Jetpack_Heartbeat
	 */
	private function __construct() {
		if ( ! Jetpack::is_active() ) {
			return;
		}

		// Schedule the task
		add_action( $this->cron_name, array( $this, 'cron_exec' ) );

		if ( ! wp_next_scheduled( $this->cron_name ) ) {
			// Deal with the old pre-3.0 weekly one.
			if ( $timestamp = wp_next_scheduled( 'jetpack_heartbeat' ) ) {
				wp_unschedule_event( $timestamp, 'jetpack_heartbeat' );
			}

			wp_schedule_event( time(), 'daily', $this->cron_name );
		}

		add_filter( 'jetpack_xmlrpc_methods', array( __CLASS__, 'jetpack_xmlrpc_methods' ) );
	}

	/**
	 * Method that gets executed on the wp-cron call
	 *
	 * @since 2.3.3
	 * @global string $wp_version
	 */
	public function cron_exec() {

		$jetpack = Jetpack::init();

		/*
		 * This should run daily.  Figuring in for variances in
		 * WP_CRON, don't let it run more than every 23 hours at most.
		 *
		 * i.e. if it ran less than 23 hours ago, fail out.
		 */
		$last = (int) Jetpack_Options::get_option( 'last_heartbeat' );
		if ( $last && ( $last + DAY_IN_SECONDS - HOUR_IN_SECONDS > time() ) ) {
			return;
		}

		/*
		 * Check for an identity crisis
		 *
		 * If one exists:
		 * - Bump stat for ID crisis
		 * - Email site admin about potential ID crisis
		 */

		// Coming Soon!

		foreach ( self::generate_stats_array( 'v2-' ) as $key => $value ) {
			$jetpack->stat( $key, $value );
		}

		Jetpack_Options::update_option( 'last_heartbeat', time() );

		$jetpack->do_stats( 'server_side' );

		/**
		 * Fires when we synchronize all registered options on heartbeat.
		 *
		 * @since 3.3.0
		 */
		do_action( 'jetpack_heartbeat' );
	}

	/**
	 * Generates heartbeat stats data.
	 *
	 * @param string $prefix Prefix to add before stats identifier.
	 *
	 * @return array The stats array.
	 */
	public static function generate_stats_array( $prefix = '' ) {
		$return = array();

		$return[ "{$prefix}version" ]        = JETPACK__VERSION;
		$return[ "{$prefix}wp-version" ]     = get_bloginfo( 'version' );
		$return[ "{$prefix}php-version" ]    = PHP_VERSION;
		$return[ "{$prefix}branch" ]         = floatval( JETPACK__VERSION );
		$return[ "{$prefix}wp-branch" ]      = floatval( get_bloginfo( 'version' ) );
		$return[ "{$prefix}php-branch" ]     = floatval( PHP_VERSION );
		$return[ "{$prefix}public" ]         = Jetpack_Options::get_option( 'public' );
		$return[ "{$prefix}ssl" ]            = Jetpack::permit_ssl();
		$return[ "{$prefix}is-https" ]       = is_ssl() ? 'https' : 'http';
		$return[ "{$prefix}language" ]       = get_bloginfo( 'language' );
		$return[ "{$prefix}charset" ]        = get_bloginfo( 'charset' );
		$return[ "{$prefix}is-multisite" ]   = is_multisite() ? 'multisite' : 'singlesite';
		$return[ "{$prefix}identitycrisis" ] = Jetpack::check_identity_crisis() ? 'yes' : 'no';
		$return[ "{$prefix}plugins" ]        = implode( ',', Jetpack::get_active_plugins() );
		if ( function_exists( 'get_mu_plugins' ) ) {
			$return[ "{$prefix}mu-plugins" ] = implode( ',', array_keys( get_mu_plugins() ) );
		}
		$return[ "{$prefix}manage-enabled" ] = true;

		$xmlrpc_errors = Jetpack_Options::get_option( 'xmlrpc_errors', array() );
		if ( $xmlrpc_errors ) {
			$return[ "{$prefix}xmlrpc-errors" ] = implode( ',', array_keys( $xmlrpc_errors ) );
			Jetpack_Options::delete_option( 'xmlrpc_errors' );
		}

		// Missing the connection owner?
		$connection_manager                 = new Manager();
		$return[ "{$prefix}missing-owner" ] = $connection_manager->is_missing_connection_owner();

		// is-multi-network can have three values, `single-site`, `single-network`, and `multi-network`.
		$return[ "{$prefix}is-multi-network" ] = 'single-site';
		if ( is_multisite() ) {
			$return[ "{$prefix}is-multi-network" ] = Jetpack::is_multi_network() ? 'multi-network' : 'single-network';
		}

		if ( ! empty( $_SERVER['SERVER_ADDR'] ) || ! empty( $_SERVER['LOCAL_ADDR'] ) ) {
			$ip     = ! empty( $_SERVER['SERVER_ADDR'] ) ? $_SERVER['SERVER_ADDR'] : $_SERVER['LOCAL_ADDR'];
			$ip_arr = array_map( 'intval', explode( '.', $ip ) );
			if ( 4 === count( $ip_arr ) ) {
				$return[ "{$prefix}ip-2-octets" ] = implode( '.', array_slice( $ip_arr, 0, 2 ) );
			}
		}

		foreach ( Jetpack::get_available_modules() as $slug ) {
			$return[ "{$prefix}module-{$slug}" ] = Jetpack::is_module_active( $slug ) ? 'on' : 'off';
		}

		return $return;
	}

	public static function jetpack_xmlrpc_methods( $methods ) {
		$methods['jetpack.getHeartbeatData'] = array( __CLASS__, 'xmlrpc_data_response' );
		return $methods;
	}

	public static function xmlrpc_data_response( $params = array() ) {
		// The WordPress XML-RPC server sets a default param of array()
		// if no argument is passed on the request and the method handlers get this array in $params.
		// generate_stats_array() needs a string as first argument.
		$params = empty( $params ) ? '' : $params;
		return self::generate_stats_array( $params );
	}

	public function deactivate() {
		// Deal with the old pre-3.0 weekly one.
		if ( $timestamp = wp_next_scheduled( 'jetpack_heartbeat' ) ) {
			wp_unschedule_event( $timestamp, 'jetpack_heartbeat' );
		}

		$timestamp = wp_next_scheduled( $this->cron_name );
		wp_unschedule_event( $timestamp, $this->cron_name );
	}

}