/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */

#include "nsISupports.idl"

/**
 * Network link status monitoring service.
 */
[scriptable, uuid(103e5293-77b3-4b70-af59-6e9e4a1f994a)]
interface nsINetworkLinkService : nsISupports
{
  /* Link type constants */
  const unsigned long LINK_TYPE_UNKNOWN = 0;
  const unsigned long LINK_TYPE_ETHERNET = 1;
  const unsigned long LINK_TYPE_USB = 2;
  const unsigned long LINK_TYPE_WIFI = 3;
  const unsigned long LINK_TYPE_WIMAX = 4;
  const unsigned long LINK_TYPE_2G = 5;
  const unsigned long LINK_TYPE_3G = 6;
  const unsigned long LINK_TYPE_4G = 7;

  /**
   * This is set to true when the system is believed to have a usable
   * network connection.
   *
   * The link is only up when network connections can be established. For
   * example, the link is down during DHCP configuration (unless there
   * is another usable interface already configured).
   *
   * If the link status is not currently known, we generally assume that
   * it is up.
   */
  readonly attribute boolean isLinkUp;
  
  /**
   * This is set to true when we believe that isLinkUp is accurate.
   */
  readonly attribute boolean linkStatusKnown;

  /**
   * The type of network connection.
   */
  readonly attribute unsigned long linkType;
};

%{C++
/**
 * We send notifications through nsIObserverService with topic
 * NS_NETWORK_LINK_TOPIC whenever one of isLinkUp or linkStatusKnown
 * changes. We pass one of the NS_NETWORK_LINK_DATA_ constants below
 * as the aData parameter of the notification.
 */
#define NS_NETWORK_LINK_TOPIC "network:link-status-changed"

/**
 * isLinkUp is now true, linkStatusKnown is true.
 */
#define NS_NETWORK_LINK_DATA_UP      "up"
/**
 * isLinkUp is now false, linkStatusKnown is true.
 */
#define NS_NETWORK_LINK_DATA_DOWN    "down"
/**
 * isLinkUp is still true, but the network setup is modified.
 * linkStatusKnown is true.
 */
#define NS_NETWORK_LINK_DATA_CHANGED "changed"
/**
 * linkStatusKnown is now false.
 */
#define NS_NETWORK_LINK_DATA_UNKNOWN "unknown"

/**
 * We send notifications through nsIObserverService with topic
 * NS_NETWORK_LINK_TYPE_TOPIC whenever the network connection type
 * changes. We pass one of the valid connection type constants
 * below as the aData parameter of the notification.
 */
#define NS_NETWORK_LINK_TYPE_TOPIC "network:link-type-changed"

/** We were unable to determine the network connection type */
#define NS_NETWORK_LINK_TYPE_UNKNOWN  "unknown"

/** A standard wired ethernet connection */
#define NS_NETWORK_LINK_TYPE_ETHERNET    "ethernet"

/** A connection via a USB port */
#define NS_NETWORK_LINK_TYPE_USB    "usb"

/** A connection via a WiFi access point (IEEE802.11) */
#define NS_NETWORK_LINK_TYPE_WIFI "wifi"

/** A connection via WiMax (IEEE802.16) */
#define NS_NETWORK_LINK_TYPE_WIMAX "wimax"

/** A '2G' mobile connection (e.g. GSM, GPRS, EDGE) */
#define NS_NETWORK_LINK_TYPE_2G "2g"

/** A '3G' mobile connection (e.g. UMTS, CDMA) */
#define NS_NETWORK_LINK_TYPE_3G "3g"

/** A '4G' mobile connection (e.g. LTE, UMB) */
#define NS_NETWORK_LINK_TYPE_4G "4g"
%}
