/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

const DEBUG = true;

importScripts("systemlibs.js");

/**
 * Get network interface properties from the system property table.
 *
 * @param ifname
 *        Name of the network interface.
 */
function getIFProperties(ifname) {
  let gateway_str = libcutils.property_get("net." + ifname + ".gw");
  return {
    ifname:      ifname,
    gateway:     netHelpers.stringToIP(gateway_str),
    gateway_str: gateway_str,
    dns1_str:    libcutils.property_get("net." + ifname + ".dns1"),
    dns2_str:    libcutils.property_get("net." + ifname + ".dns2"),
  };
}

/**
 * Routines accessible to the main thread.
 */

/**
 * Dispatch a message from the main thread to a function.
 */
self.onmessage = function onmessage(event) {
  let message = event.data;
  if (DEBUG) debug("received message: " + JSON.stringify(message));
  let ret = self[message.cmd](message);
  postMessage({id: message.id, ret: ret});
};

/**
 * Set default route and DNS servers for given network interface.
 */
function setDefaultRouteAndDNS(options) {
  if (!options.gateway || !options.dns1_str) {
    options = getIFProperties(options.ifname);
  }

  libnetutils.ifc_set_default_route(options.ifname, options.gateway);
  libcutils.property_set("net.dns1", options.dns1_str);
  libcutils.property_set("net.dns2", options.dns2_str);

  // Bump the DNS change property.
  let dnschange = libcutils.property_get("net.dnschange", "0");
  libcutils.property_set("net.dnschange", (parseInt(dnschange, 10) + 1).toString());
}

/**
 * Run DHCP and set default route and DNS servers for a given
 * network interface.
 */
function runDHCPAndSetDefaultRouteAndDNS(options) {
  let dhcp = libnetutils.dhcp_do_request(options.ifname);
  dhcp.ifname = options.ifname;

  //TODO this could be race-y... by the time we've finished the DHCP request
  // and are now fudging with the routes, another network interface may have
  // come online that's preferred...
  setDefaultRouteAndDNS(dhcp);
}

if (!this.debug) {
  this.debug = function debug(message) {
    dump("Network Worker: " + message + "\n");
  };
}