/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* 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/. */

#ifndef mozilla_dom_power_PowerManagerService_h

#define mozilla_dom_power_PowerManagerService_h

#include "nsCOMPtr.h"

#include "nsDataHashtable.h"

#include "nsHashKeys.h"

#include "nsTArray.h"

#include "nsIDOMWakeLockListener.h"

#include "nsIPowerManagerService.h"

#include "mozilla/HalWakeLockInformation.h"

#include "mozilla/StaticPtr.h"

#include "mozilla/dom/WakeLock.h"

namespace mozilla {

namespace dom {

class ContentParent;

namespace power {

class PowerManagerService

  : public nsIPowerManagerService

  , public hal::WakeLockObserver

{

public:

  NS_DECL_ISUPPORTS

  NS_DECL_NSIPOWERMANAGERSERVICE

  PowerManagerService() {}

  static already_AddRefed<PowerManagerService> GetInstance();

  void Init();

  // Implement WakeLockObserver

  void Notify(const hal::WakeLockInformation& aWakeLockInfo) override;

  /**

   * Acquire a wake lock on behalf of a given process (aContentParent).

   *

   * This method stands in contrast to nsIPowerManagerService::NewWakeLock,

   * which acquires a wake lock on behalf of the /current/ process.

   *

   * NewWakeLockOnBehalfOfProcess is different from NewWakeLock in that

   *

   *  - The wake lock unlocks itself if the /given/ process dies, and

   *  - The /given/ process shows up in WakeLockInfo::lockingProcesses.

   *

   */

  already_AddRefed<WakeLock>

  NewWakeLockOnBehalfOfProcess(const nsAString& aTopic,

                               ContentParent* aContentParent);

  already_AddRefed<WakeLock>

  NewWakeLock(const nsAString& aTopic, nsPIDOMWindowInner* aWindow,

              mozilla::ErrorResult& aRv);

private:

  ~PowerManagerService();

  void ComputeWakeLockState(const hal::WakeLockInformation& aWakeLockInfo,

                            nsAString &aState);

  static StaticRefPtr<PowerManagerService> sSingleton;

  nsTArray<nsCOMPtr<nsIDOMMozWakeLockListener>> mWakeLockListeners;

};

} // namespace power

} // namespace dom

} // namespace mozilla

#endif // mozilla_dom_power_PowerManagerService_h