// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// The <code>chrome.system.powerSource</code> API allows Chrome Kiosk Apps to
// query the state of connected power sources.
[platforms=("chromeos")]
namespace system.powerSource {
  enum PowerSourceType {
    // Unspecified type.
    unknown,

    // Dedicated charger. Typically single-purpose and non-USB (e.g. barrel
    // jack plugs).
    mains,

    // USB charger, including both low-power Type-A chargers and high-power
    // Type-C chargers using USB Power Delivery.
    usb
  };

  dictionary PowerSourceInfo {
    // Type of power source.
    PowerSourceType type;

    // Maximum power this source is capable of delivering if known. Reported in
    // watts, rounded to two significant digits.
    double? maxPower;

    // Whether this power source is connected to the device.
    boolean active;
  };

  callback PowerSourceInfoCallback =
      void(optional PowerSourceInfo[] powerSourceInfo);

  interface Functions {
    // Requests information on attached power sources.
    // |callback|: The callback to invoke with the results or
    // undefined if the power source information is not known.
    static void getPowerSourceInfo(PowerSourceInfoCallback callback);

    // Requests a power source status update. Resulting power source status
    // updates are observable using $(ref:onPowerChanged).
    static void requestStatusUpdate();
  };

  interface Events {
    // Event for changes in the set of connected power sources.
    static void onPowerChanged(PowerSourceInfo[] powerSourceInfo);
  };
};