// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library fuchsia.power;

enum Status {
  OK = 0;
  NotAvailable = 1;
};

// Provides battery status
struct BatteryStatus {
  // Error status
  Status status;

  // If battery is present
  bool batteryPresent;

  // If battery is charging
  bool charging;

  // If battery is dis-charging
  bool discharging;

  // If battery is at critical level
  bool critical;

  // If power cable is plugged in
  bool powerAdapterOnline;

  // To distinguish between latest and stale status
  int64 timestamp;

  // Battery level in percentage
  float32 level;

  // Remaining Battery life in hours. It is negative when battery is not discharging
  float32 remainingBatteryLife;
};

// Manager Interface used to manage power
[Discoverable]
interface PowerManager {
  // Gets battery status
  1: GetBatteryStatus() -> (BatteryStatus status);

  // watcher called when battery status changes
  2: Watch(PowerManagerWatcher watcher);
};

// Watcher on battery status
interface PowerManagerWatcher {
  1: OnChangeBatteryStatus(BatteryStatus battery_status);
};