/* -*- 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/. */

#include "mozilla/dom/ContentParent.h"

#include "mozilla/Hal.h"

#include "mozilla/HalWakeLock.h"

#include "mozilla/ClearOnShutdown.h"

#include "mozilla/Preferences.h"

#include "mozilla/Services.h"

#include "nsIDOMWakeLockListener.h"

#include "nsIDOMWindow.h"

#include "nsIObserverService.h"

#include "PowerManagerService.h"

#include "WakeLock.h"

// For _exit().

#ifdef XP_WIN

#include <process.h>

#else

#include <unistd.h>

#endif

namespace mozilla {

namespace dom {

namespace power {

using namespace hal;

NS_IMPL_ISUPPORTS(PowerManagerService, nsIPowerManagerService)

/* static */ StaticRefPtr<PowerManagerService> PowerManagerService::sSingleton;

/* static */ already_AddRefed<PowerManagerService>

PowerManagerService::GetInstance()

{

  if (!sSingleton) {

    sSingleton = new PowerManagerService();

    sSingleton->Init();

    ClearOnShutdown(&sSingleton);

  }

  RefPtr<PowerManagerService> service = sSingleton.get();

  return service.forget();

}

void

PowerManagerService::Init()

{

  RegisterWakeLockObserver(this);

}

PowerManagerService::~PowerManagerService()

{

  UnregisterWakeLockObserver(this);

}

void

PowerManagerService::ComputeWakeLockState(const WakeLockInformation& aWakeLockInfo,

                                          nsAString &aState)

{

  WakeLockState state = hal::ComputeWakeLockState(aWakeLockInfo.numLocks(),

                                                  aWakeLockInfo.numHidden());

  switch (state) {

  case WAKE_LOCK_STATE_UNLOCKED:

    aState.AssignLiteral("unlocked");

    break;

  case WAKE_LOCK_STATE_HIDDEN:

    aState.AssignLiteral("locked-background");

    break;

  case WAKE_LOCK_STATE_VISIBLE:

    aState.AssignLiteral("locked-foreground");

    break;

  }

}

void

PowerManagerService::Notify(const WakeLockInformation& aWakeLockInfo)

{

  nsAutoString state;

  ComputeWakeLockState(aWakeLockInfo, state);

  /**

   * Copy the listeners list before we walk through the callbacks

   * because the callbacks may install new listeners. We expect no

   * more than one listener per window, so it shouldn't be too long.

   */

  AutoTArray<nsCOMPtr<nsIDOMMozWakeLockListener>, 2> listeners(mWakeLockListeners);

  for (uint32_t i = 0; i < listeners.Length(); ++i) {

    listeners[i]->Callback(aWakeLockInfo.topic(), state);

  }

}

NS_IMETHODIMP

PowerManagerService::AddWakeLockListener(nsIDOMMozWakeLockListener *aListener)

{

  if (mWakeLockListeners.Contains(aListener))

    return NS_OK;

  mWakeLockListeners.AppendElement(aListener);

  return NS_OK;

}

NS_IMETHODIMP

PowerManagerService::RemoveWakeLockListener(nsIDOMMozWakeLockListener *aListener)

{

  mWakeLockListeners.RemoveElement(aListener);

  return NS_OK;

}

NS_IMETHODIMP

PowerManagerService::GetWakeLockState(const nsAString &aTopic, nsAString &aState)

{

  WakeLockInformation info;

  GetWakeLockInfo(aTopic, &info);

  ComputeWakeLockState(info, aState);

  return NS_OK;

}

already_AddRefed<WakeLock>

PowerManagerService::NewWakeLock(const nsAString& aTopic,

                                 nsPIDOMWindowInner* aWindow,

                                 mozilla::ErrorResult& aRv)

{

  RefPtr<WakeLock> wakelock = new WakeLock();

  aRv = wakelock->Init(aTopic, aWindow);

  if (aRv.Failed()) {

    return nullptr;

  }

  return wakelock.forget();

}

NS_IMETHODIMP

PowerManagerService::NewWakeLock(const nsAString &aTopic,

                                 mozIDOMWindow *aWindow,

                                 nsISupports **aWakeLock)

{

  mozilla::ErrorResult rv;

  RefPtr<WakeLock> wakelock =

    NewWakeLock(aTopic, nsPIDOMWindowInner::From(aWindow), rv);

  if (rv.Failed()) {

    return rv.StealNSResult();

  }

  nsCOMPtr<nsIDOMEventListener> eventListener = wakelock.get();

  eventListener.forget(aWakeLock);

  return NS_OK;

}

already_AddRefed<WakeLock>

PowerManagerService::NewWakeLockOnBehalfOfProcess(const nsAString& aTopic,

                                                  ContentParent* aContentParent)

{

  RefPtr<WakeLock> wakelock = new WakeLock();

  nsresult rv = wakelock->Init(aTopic, aContentParent);

  NS_ENSURE_SUCCESS(rv, nullptr);

  return wakelock.forget();

}

} // namespace power

} // namespace dom

} // namespace mozilla