/* 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 "AlarmHalService.h"

namespace mozilla {
namespace dom {
namespace alarm {

using namespace hal;

NS_IMPL_ISUPPORTS1(AlarmHalService, nsIAlarmHalService)

void
AlarmHalService::Init()
{
  mAlarmEnabled = RegisterTheOneAlarmObserver(this);
  if (!mAlarmEnabled) {
    return;
  }
  RegisterSystemTimeChangeObserver(this);
}

/* virtual */ AlarmHalService::~AlarmHalService() 
{
  if (mAlarmEnabled) {
    UnregisterTheOneAlarmObserver();
    UnregisterSystemTimeChangeObserver(this);
  }
}

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

/* static */ already_AddRefed<nsIAlarmHalService>
AlarmHalService::GetInstance()
{
  if (!sSingleton) {
    sSingleton = new AlarmHalService();
    sSingleton->Init(); 
    ClearOnShutdown(&sSingleton);
  }

  nsCOMPtr<nsIAlarmHalService> service(do_QueryInterface(sSingleton));
  return service.forget();
}

NS_IMETHODIMP
AlarmHalService::SetAlarm(int32_t aSeconds, int32_t aNanoseconds, bool* aStatus)
{
  if (!mAlarmEnabled) {
    return NS_ERROR_FAILURE;
  }

  bool status = hal::SetAlarm(aSeconds, aNanoseconds);
  if (status) {
    *aStatus = status;
    return NS_OK;
  } else {
    return NS_ERROR_FAILURE;
  }
}

NS_IMETHODIMP
AlarmHalService::SetAlarmFiredCb(nsIAlarmFiredCb* aAlarmFiredCb)
{
  mAlarmFiredCb = aAlarmFiredCb;
  return NS_OK;
}

NS_IMETHODIMP
AlarmHalService::SetTimezoneChangedCb(nsITimezoneChangedCb* aTimeZoneChangedCb)
{
  mTimezoneChangedCb = aTimeZoneChangedCb;
  return NS_OK;
}

void
AlarmHalService::Notify(const mozilla::void_t& aVoid)
{
  if (!mAlarmFiredCb) {
    return;
  }
  mAlarmFiredCb->OnAlarmFired();
}

void
AlarmHalService::Notify(const SystemTimeChange& aReason)
{
  if (aReason != SYS_TIME_CHANGE_TZ || !mTimezoneChangedCb) {
    return;
  }
  mTimezoneChangedCb->OnTimezoneChanged(GetTimezoneOffset(false));
}

int32_t
AlarmHalService::GetTimezoneOffset(bool aIgnoreDST)
{
  PRExplodedTime prTime;
  PR_ExplodeTime(PR_Now(), PR_LocalTimeParameters, &prTime);

  int32_t offset = prTime.tm_params.tp_gmt_offset;
  if (!aIgnoreDST) {
    offset += prTime.tm_params.tp_dst_offset;
  }

  return -(offset / 60);
}

} // alarm
} // dom
} // mozilla