// Copyright (c) Microsoft Corporation
// All rights reserved. 
//
// Licensed under the Apache License, Version 2.0 (the ""License""); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 
//
// THIS CODE IS PROVIDED ON AN  *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR NON-INFRINGEMENT. 
//
// See the Apache Version 2.0 License for specific language governing permissions and limitations under the License.

// TODO: Verify that this is is still needed..
#define NTDDI_VERSION 0x06010000

#include <v8.h>
#include "nan.h"
#include <string>
#include <ppltasks.h>
#include "CollectionsConverter.h"
#include "CollectionsWrap.h"
#include "node-async.h"
#include "NodeRtUtils.h"
#include "OpaqueWrapper.h"
#include "WrapperBase.h"

#using <Windows.WinMD>

// this undefs fixes the issues of compiling Windows.Data.Json, Windows.Storag.FileProperties, and Windows.Stroage.Search
// Some of the node header files brings windows definitions with the same names as some of the WinRT methods
#undef DocumentProperties
#undef GetObject
#undef CreateEvent
#undef FindText
#undef SendMessage

const char* REGISTRATION_TOKEN_MAP_PROPERTY_NAME = "__registrationTokenMap__";

using v8::Array;
using v8::String;
using v8::Handle;
using v8::Value;
using v8::Boolean;
using v8::Integer;
using v8::FunctionTemplate;
using v8::Object;
using v8::Local;
using v8::Function;
using v8::Date;
using v8::Number;
using v8::PropertyAttribute;
using v8::Primitive;
using Nan::HandleScope;
using Nan::Persistent;
using Nan::Undefined;
using Nan::True;
using Nan::False;
using Nan::Null;
using Nan::MaybeLocal;
using Nan::EscapableHandleScope;
using Nan::HandleScope;
using Nan::TryCatch;
using namespace concurrency;

namespace NodeRT { namespace Windows { namespace System { namespace Power { 

  v8::Local<v8::Value> WrapPowerManager(::Windows::System::Power::PowerManager^ wintRtInstance);
  ::Windows::System::Power::PowerManager^ UnwrapPowerManager(Local<Value> value);
  
  v8::Local<v8::Value> WrapBackgroundEnergyManager(::Windows::System::Power::BackgroundEnergyManager^ wintRtInstance);
  ::Windows::System::Power::BackgroundEnergyManager^ UnwrapBackgroundEnergyManager(Local<Value> value);
  
  v8::Local<v8::Value> WrapForegroundEnergyManager(::Windows::System::Power::ForegroundEnergyManager^ wintRtInstance);
  ::Windows::System::Power::ForegroundEnergyManager^ UnwrapForegroundEnergyManager(Local<Value> value);
  


  static void InitBatteryStatusEnum(const Local<Object> exports)
  {
    HandleScope scope;
    
	Local<Object> enumObject = Nan::New<Object>();
    Nan::Set(exports, Nan::New<String>("BatteryStatus").ToLocalChecked(), enumObject);
	Nan::Set(enumObject, Nan::New<String>("notPresent").ToLocalChecked(), Nan::New<Integer>(static_cast<int>(::Windows::System::Power::BatteryStatus::NotPresent)));
	Nan::Set(enumObject, Nan::New<String>("discharging").ToLocalChecked(), Nan::New<Integer>(static_cast<int>(::Windows::System::Power::BatteryStatus::Discharging)));
	Nan::Set(enumObject, Nan::New<String>("idle").ToLocalChecked(), Nan::New<Integer>(static_cast<int>(::Windows::System::Power::BatteryStatus::Idle)));
	Nan::Set(enumObject, Nan::New<String>("charging").ToLocalChecked(), Nan::New<Integer>(static_cast<int>(::Windows::System::Power::BatteryStatus::Charging)));
  }


  static void InitEnergySaverStatusEnum(const Local<Object> exports)
  {
    HandleScope scope;
    
	Local<Object> enumObject = Nan::New<Object>();
    Nan::Set(exports, Nan::New<String>("EnergySaverStatus").ToLocalChecked(), enumObject);
	Nan::Set(enumObject, Nan::New<String>("disabled").ToLocalChecked(), Nan::New<Integer>(static_cast<int>(::Windows::System::Power::EnergySaverStatus::Disabled)));
	Nan::Set(enumObject, Nan::New<String>("off").ToLocalChecked(), Nan::New<Integer>(static_cast<int>(::Windows::System::Power::EnergySaverStatus::Off)));
	Nan::Set(enumObject, Nan::New<String>("on").ToLocalChecked(), Nan::New<Integer>(static_cast<int>(::Windows::System::Power::EnergySaverStatus::On)));
  }


  static void InitPowerSupplyStatusEnum(const Local<Object> exports)
  {
    HandleScope scope;
    
	Local<Object> enumObject = Nan::New<Object>();
    Nan::Set(exports, Nan::New<String>("PowerSupplyStatus").ToLocalChecked(), enumObject);
	Nan::Set(enumObject, Nan::New<String>("notPresent").ToLocalChecked(), Nan::New<Integer>(static_cast<int>(::Windows::System::Power::PowerSupplyStatus::NotPresent)));
	Nan::Set(enumObject, Nan::New<String>("inadequate").ToLocalChecked(), Nan::New<Integer>(static_cast<int>(::Windows::System::Power::PowerSupplyStatus::Inadequate)));
	Nan::Set(enumObject, Nan::New<String>("adequate").ToLocalChecked(), Nan::New<Integer>(static_cast<int>(::Windows::System::Power::PowerSupplyStatus::Adequate)));
  }



  
  class PowerManager : public WrapperBase
  {
  public:    
    static void Init(const Local<Object> exports)
    {
      HandleScope scope;
      
      Local<FunctionTemplate> localRef = Nan::New<FunctionTemplate>(New);
      s_constructorTemplate.Reset(localRef);
      localRef->SetClassName(Nan::New<String>("PowerManager").ToLocalChecked());
      localRef->InstanceTemplate()->SetInternalFieldCount(1);
      
                              
      Local<Object> constructor = Nan::To<Object>(Nan::GetFunction(localRef).ToLocalChecked()).ToLocalChecked();
	  Nan::SetMethod(constructor, "castFrom", CastFrom);

      Nan::SetAccessor(constructor, Nan::New<String>("batteryStatus").ToLocalChecked(), BatteryStatusGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("energySaverStatus").ToLocalChecked(), EnergySaverStatusGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("powerSupplyStatus").ToLocalChecked(), PowerSupplyStatusGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("remainingChargePercent").ToLocalChecked(), RemainingChargePercentGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("remainingDischargeTime").ToLocalChecked(), RemainingDischargeTimeGetter);
      
      Local<Function> addListenerFunc = Nan::GetFunction(Nan::New<FunctionTemplate>(AddListener)).ToLocalChecked();
      Nan::Set(constructor, Nan::New<String>("addListener").ToLocalChecked(), addListenerFunc);
      Nan::Set(constructor, Nan::New<String>("on").ToLocalChecked(), addListenerFunc);
      Local<Function> removeListenerFunc = Nan::GetFunction(Nan::New<FunctionTemplate>(RemoveListener)).ToLocalChecked();
      Nan::Set(constructor, Nan::New<String>("removeListener").ToLocalChecked(), removeListenerFunc);
      Nan::Set(constructor, Nan::New<String>("off").ToLocalChecked(), removeListenerFunc);

      Nan::Set(exports, Nan::New<String>("PowerManager").ToLocalChecked(), constructor);
    }


    virtual ::Platform::Object^ GetObjectInstance() const override
    {
      return _instance;
    }

  private:
    
    PowerManager(::Windows::System::Power::PowerManager^ instance)
    {
      _instance = instance;
    }
    
    
    static void New(Nan::NAN_METHOD_ARGS_TYPE info)
    {
      HandleScope scope;

	    Local<FunctionTemplate> localRef = Nan::New<FunctionTemplate>(s_constructorTemplate);

      // in case the constructor was called without the new operator
      if (!localRef->HasInstance(info.This()))
      {
        if (info.Length() > 0)
        {
          std::unique_ptr<Local<Value> []> constructorArgs(new Local<Value>[info.Length()]);

          Local<Value> *argsPtr = constructorArgs.get();
          for (int i = 0; i < info.Length(); i++)
          {
            argsPtr[i] = info[i];
          }

		  MaybeLocal<Object> res = Nan::NewInstance(Nan::GetFunction(localRef).ToLocalChecked(), info.Length(), constructorArgs.get());
		  if (res.IsEmpty())
		  {
			  return;
		  }
		  info.GetReturnValue().Set(res.ToLocalChecked());
		  return;
		}
		else
		{
          MaybeLocal<Object> res = Nan::NewInstance(Nan::GetFunction(localRef).ToLocalChecked(), info.Length(), nullptr);
          if (res.IsEmpty())
          {
            return;
          }
          info.GetReturnValue().Set(res.ToLocalChecked());
          return;
        }
      }
      
      ::Windows::System::Power::PowerManager^ winRtInstance;


      if (info.Length() == 1 && OpaqueWrapper::IsOpaqueWrapper(info[0]) &&
        NodeRT::Utils::IsWinRtWrapperOf<::Windows::System::Power::PowerManager^>(info[0]))
      {
        try 
        {
          winRtInstance = (::Windows::System::Power::PowerManager^) NodeRT::Utils::GetObjectInstance(info[0]);
        }
        catch (Platform::Exception ^exception)
        {
          NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
          return;
        }
      }
      else
      {
        Nan::ThrowError(Nan::Error(NodeRT::Utils::NewString(L"Invalid arguments, no suitable constructor found")));
	    	return;
      }

      NodeRT::Utils::SetHiddenValue(info.This(), Nan::New<String>("__winRtInstance__").ToLocalChecked(), True());

      PowerManager *wrapperInstance = new PowerManager(winRtInstance);
      wrapperInstance->Wrap(info.This());

      info.GetReturnValue().Set(info.This());
    }


	
    static void CastFrom(Nan::NAN_METHOD_ARGS_TYPE info)
    {
		HandleScope scope;
		if (info.Length() < 1 || !NodeRT::Utils::IsWinRtWrapperOf<::Windows::System::Power::PowerManager^>(info[0]))
		{
			Nan::ThrowError(Nan::Error(NodeRT::Utils::NewString(L"Invalid arguments, no object provided, or given object could not be casted to requested type")));
			return;
		}

		::Windows::System::Power::PowerManager^ winRtInstance;
		try
		{
			winRtInstance = (::Windows::System::Power::PowerManager^) NodeRT::Utils::GetObjectInstance(info[0]);
		}
		catch (Platform::Exception ^exception)
		{
			NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
			return;
		}

		info.GetReturnValue().Set(WrapPowerManager(winRtInstance));
    }


  




    static void BatteryStatusGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        ::Windows::System::Power::BatteryStatus result = ::Windows::System::Power::PowerManager::BatteryStatus;
        info.GetReturnValue().Set(Nan::New<Integer>(static_cast<int>(result)));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void EnergySaverStatusGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        ::Windows::System::Power::EnergySaverStatus result = ::Windows::System::Power::PowerManager::EnergySaverStatus;
        info.GetReturnValue().Set(Nan::New<Integer>(static_cast<int>(result)));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void PowerSupplyStatusGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        ::Windows::System::Power::PowerSupplyStatus result = ::Windows::System::Power::PowerManager::PowerSupplyStatus;
        info.GetReturnValue().Set(Nan::New<Integer>(static_cast<int>(result)));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void RemainingChargePercentGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        int result = ::Windows::System::Power::PowerManager::RemainingChargePercent;
        info.GetReturnValue().Set(Nan::New<Integer>(result));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void RemainingDischargeTimeGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        ::Windows::Foundation::TimeSpan result = ::Windows::System::Power::PowerManager::RemainingDischargeTime;
        info.GetReturnValue().Set(Nan::New<Number>(result.Duration/10000.0));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    

    static void AddListener(Nan::NAN_METHOD_ARGS_TYPE info)
    {
      HandleScope scope;

      if (info.Length() < 2 || !info[0]->IsString() || !info[1]->IsFunction())
      {
        Nan::ThrowError(Nan::Error(NodeRT::Utils::NewString(L"wrong arguments, expected arguments are eventName(string),callback(function)")));
		return;
      }

      String::Value eventName(info[0]);
      auto str = *eventName;
      
      Local<Function> callback = info[1].As<Function>();
      
      ::Windows::Foundation::EventRegistrationToken registrationToken;
      if (NodeRT::Utils::CaseInsenstiveEquals(L"batteryStatusChanged", str))
      {
      
        try
        {
          Persistent<Object>* perstPtr = new Persistent<Object>();
          perstPtr->Reset(NodeRT::Utils::CreateCallbackObjectInDomain(callback));
          std::shared_ptr<Persistent<Object>> callbackObjPtr(perstPtr, 
            [] (Persistent<Object> *ptr ) {
              NodeUtils::Async::RunOnMain([ptr]() {
                ptr->Reset();
                delete ptr;
            });
          });

          registrationToken = ::Windows::System::Power::PowerManager::BatteryStatusChanged::add(
            ref new ::Windows::Foundation::EventHandler<::Platform::Object^>(
            [callbackObjPtr](::Platform::Object^ arg0, ::Platform::Object^ arg1) {
              NodeUtils::Async::RunOnMain([callbackObjPtr , arg0, arg1]() {
           	    HandleScope scope;
                TryCatch tryCatch;
              
                Local<Value> error;

                Local<Value> wrappedArg0 = CreateOpaqueWrapper(arg0);
                Local<Value> wrappedArg1 = CreateOpaqueWrapper(arg1);

                if (tryCatch.HasCaught())
                {
                  error = Nan::To<Object>(tryCatch.Exception()).ToLocalChecked();
                }
                else 
                {
                  error = Undefined();
                }

				// TODO: this is ugly! Needed due to the possibility of expception occuring inside object convertors
				// can be fixed by wrapping the conversion code in a function and calling it on the fly
				// we must clear the try catch block here so the invoked inner method exception won't get swollen (issue #52) 
				tryCatch.~TryCatch();


                if (wrappedArg0.IsEmpty()) wrappedArg0 = Undefined();
                if (wrappedArg1.IsEmpty()) wrappedArg1 = Undefined();

                Local<Value> args[] = { wrappedArg0, wrappedArg1 };
                Local<Object> callbackObjLocalRef = Nan::New<Object>(*callbackObjPtr);
                NodeRT::Utils::CallCallbackInDomain(callbackObjLocalRef, _countof(args), args);
              });
            })
          );
        }
        catch (Platform::Exception ^exception)
        {
          NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
          return;
        }

      }
      else if (NodeRT::Utils::CaseInsenstiveEquals(L"energySaverStatusChanged", str))
      {
      
        try
        {
          Persistent<Object>* perstPtr = new Persistent<Object>();
          perstPtr->Reset(NodeRT::Utils::CreateCallbackObjectInDomain(callback));
          std::shared_ptr<Persistent<Object>> callbackObjPtr(perstPtr, 
            [] (Persistent<Object> *ptr ) {
              NodeUtils::Async::RunOnMain([ptr]() {
                ptr->Reset();
                delete ptr;
            });
          });

          registrationToken = ::Windows::System::Power::PowerManager::EnergySaverStatusChanged::add(
            ref new ::Windows::Foundation::EventHandler<::Platform::Object^>(
            [callbackObjPtr](::Platform::Object^ arg0, ::Platform::Object^ arg1) {
              NodeUtils::Async::RunOnMain([callbackObjPtr , arg0, arg1]() {
           	    HandleScope scope;
                TryCatch tryCatch;
              
                Local<Value> error;

                Local<Value> wrappedArg0 = CreateOpaqueWrapper(arg0);
                Local<Value> wrappedArg1 = CreateOpaqueWrapper(arg1);

                if (tryCatch.HasCaught())
                {
                  error = Nan::To<Object>(tryCatch.Exception()).ToLocalChecked();
                }
                else 
                {
                  error = Undefined();
                }

				// TODO: this is ugly! Needed due to the possibility of expception occuring inside object convertors
				// can be fixed by wrapping the conversion code in a function and calling it on the fly
				// we must clear the try catch block here so the invoked inner method exception won't get swollen (issue #52) 
				tryCatch.~TryCatch();


                if (wrappedArg0.IsEmpty()) wrappedArg0 = Undefined();
                if (wrappedArg1.IsEmpty()) wrappedArg1 = Undefined();

                Local<Value> args[] = { wrappedArg0, wrappedArg1 };
                Local<Object> callbackObjLocalRef = Nan::New<Object>(*callbackObjPtr);
                NodeRT::Utils::CallCallbackInDomain(callbackObjLocalRef, _countof(args), args);
              });
            })
          );
        }
        catch (Platform::Exception ^exception)
        {
          NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
          return;
        }

      }
      else if (NodeRT::Utils::CaseInsenstiveEquals(L"powerSupplyStatusChanged", str))
      {
      
        try
        {
          Persistent<Object>* perstPtr = new Persistent<Object>();
          perstPtr->Reset(NodeRT::Utils::CreateCallbackObjectInDomain(callback));
          std::shared_ptr<Persistent<Object>> callbackObjPtr(perstPtr, 
            [] (Persistent<Object> *ptr ) {
              NodeUtils::Async::RunOnMain([ptr]() {
                ptr->Reset();
                delete ptr;
            });
          });

          registrationToken = ::Windows::System::Power::PowerManager::PowerSupplyStatusChanged::add(
            ref new ::Windows::Foundation::EventHandler<::Platform::Object^>(
            [callbackObjPtr](::Platform::Object^ arg0, ::Platform::Object^ arg1) {
              NodeUtils::Async::RunOnMain([callbackObjPtr , arg0, arg1]() {
           	    HandleScope scope;
                TryCatch tryCatch;
              
                Local<Value> error;

                Local<Value> wrappedArg0 = CreateOpaqueWrapper(arg0);
                Local<Value> wrappedArg1 = CreateOpaqueWrapper(arg1);

                if (tryCatch.HasCaught())
                {
                  error = Nan::To<Object>(tryCatch.Exception()).ToLocalChecked();
                }
                else 
                {
                  error = Undefined();
                }

				// TODO: this is ugly! Needed due to the possibility of expception occuring inside object convertors
				// can be fixed by wrapping the conversion code in a function and calling it on the fly
				// we must clear the try catch block here so the invoked inner method exception won't get swollen (issue #52) 
				tryCatch.~TryCatch();


                if (wrappedArg0.IsEmpty()) wrappedArg0 = Undefined();
                if (wrappedArg1.IsEmpty()) wrappedArg1 = Undefined();

                Local<Value> args[] = { wrappedArg0, wrappedArg1 };
                Local<Object> callbackObjLocalRef = Nan::New<Object>(*callbackObjPtr);
                NodeRT::Utils::CallCallbackInDomain(callbackObjLocalRef, _countof(args), args);
              });
            })
          );
        }
        catch (Platform::Exception ^exception)
        {
          NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
          return;
        }

      }
      else if (NodeRT::Utils::CaseInsenstiveEquals(L"remainingChargePercentChanged", str))
      {
      
        try
        {
          Persistent<Object>* perstPtr = new Persistent<Object>();
          perstPtr->Reset(NodeRT::Utils::CreateCallbackObjectInDomain(callback));
          std::shared_ptr<Persistent<Object>> callbackObjPtr(perstPtr, 
            [] (Persistent<Object> *ptr ) {
              NodeUtils::Async::RunOnMain([ptr]() {
                ptr->Reset();
                delete ptr;
            });
          });

          registrationToken = ::Windows::System::Power::PowerManager::RemainingChargePercentChanged::add(
            ref new ::Windows::Foundation::EventHandler<::Platform::Object^>(
            [callbackObjPtr](::Platform::Object^ arg0, ::Platform::Object^ arg1) {
              NodeUtils::Async::RunOnMain([callbackObjPtr , arg0, arg1]() {
           	    HandleScope scope;
                TryCatch tryCatch;
              
                Local<Value> error;

                Local<Value> wrappedArg0 = CreateOpaqueWrapper(arg0);
                Local<Value> wrappedArg1 = CreateOpaqueWrapper(arg1);

                if (tryCatch.HasCaught())
                {
                  error = Nan::To<Object>(tryCatch.Exception()).ToLocalChecked();
                }
                else 
                {
                  error = Undefined();
                }

				// TODO: this is ugly! Needed due to the possibility of expception occuring inside object convertors
				// can be fixed by wrapping the conversion code in a function and calling it on the fly
				// we must clear the try catch block here so the invoked inner method exception won't get swollen (issue #52) 
				tryCatch.~TryCatch();


                if (wrappedArg0.IsEmpty()) wrappedArg0 = Undefined();
                if (wrappedArg1.IsEmpty()) wrappedArg1 = Undefined();

                Local<Value> args[] = { wrappedArg0, wrappedArg1 };
                Local<Object> callbackObjLocalRef = Nan::New<Object>(*callbackObjPtr);
                NodeRT::Utils::CallCallbackInDomain(callbackObjLocalRef, _countof(args), args);
              });
            })
          );
        }
        catch (Platform::Exception ^exception)
        {
          NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
          return;
        }

      }
      else if (NodeRT::Utils::CaseInsenstiveEquals(L"remainingDischargeTimeChanged", str))
      {
      
        try
        {
          Persistent<Object>* perstPtr = new Persistent<Object>();
          perstPtr->Reset(NodeRT::Utils::CreateCallbackObjectInDomain(callback));
          std::shared_ptr<Persistent<Object>> callbackObjPtr(perstPtr, 
            [] (Persistent<Object> *ptr ) {
              NodeUtils::Async::RunOnMain([ptr]() {
                ptr->Reset();
                delete ptr;
            });
          });

          registrationToken = ::Windows::System::Power::PowerManager::RemainingDischargeTimeChanged::add(
            ref new ::Windows::Foundation::EventHandler<::Platform::Object^>(
            [callbackObjPtr](::Platform::Object^ arg0, ::Platform::Object^ arg1) {
              NodeUtils::Async::RunOnMain([callbackObjPtr , arg0, arg1]() {
           	    HandleScope scope;
                TryCatch tryCatch;
              
                Local<Value> error;

                Local<Value> wrappedArg0 = CreateOpaqueWrapper(arg0);
                Local<Value> wrappedArg1 = CreateOpaqueWrapper(arg1);

                if (tryCatch.HasCaught())
                {
                  error = Nan::To<Object>(tryCatch.Exception()).ToLocalChecked();
                }
                else 
                {
                  error = Undefined();
                }

				// TODO: this is ugly! Needed due to the possibility of expception occuring inside object convertors
				// can be fixed by wrapping the conversion code in a function and calling it on the fly
				// we must clear the try catch block here so the invoked inner method exception won't get swollen (issue #52) 
				tryCatch.~TryCatch();


                if (wrappedArg0.IsEmpty()) wrappedArg0 = Undefined();
                if (wrappedArg1.IsEmpty()) wrappedArg1 = Undefined();

                Local<Value> args[] = { wrappedArg0, wrappedArg1 };
                Local<Object> callbackObjLocalRef = Nan::New<Object>(*callbackObjPtr);
                NodeRT::Utils::CallCallbackInDomain(callbackObjLocalRef, _countof(args), args);
              });
            })
          );
        }
        catch (Platform::Exception ^exception)
        {
          NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
          return;
        }

      }
      else 
      {
        Nan::ThrowError(Nan::Error(String::Concat(NodeRT::Utils::NewString(L"given event name isn't supported: "), info[0].As<String>())));
		return;
      }

      Local<Value> tokenMapVal = NodeRT::Utils::GetHiddenValue(callback, Nan::New<String>(REGISTRATION_TOKEN_MAP_PROPERTY_NAME).ToLocalChecked());
      Local<Object> tokenMap;

      if (tokenMapVal.IsEmpty() || Nan::Equals(tokenMapVal, Undefined()).FromMaybe(false))
      {
        tokenMap = Nan::New<Object>();
        NodeRT::Utils::SetHiddenValueWithObject(callback, Nan::New<String>(REGISTRATION_TOKEN_MAP_PROPERTY_NAME).ToLocalChecked(), tokenMap);
      }
      else
      {
        tokenMap = Nan::To<Object>(tokenMapVal).ToLocalChecked();
      }

      Nan::Set(tokenMap, info[0], CreateOpaqueWrapper(::Windows::Foundation::PropertyValue::CreateInt64(registrationToken.Value)));
    }

    static void RemoveListener(Nan::NAN_METHOD_ARGS_TYPE info)
    {
      HandleScope scope;

      if (info.Length() < 2 || !info[0]->IsString() || !info[1]->IsFunction())
      {
        Nan::ThrowError(Nan::Error(NodeRT::Utils::NewString(L"wrong arguments, expected a string and a callback")));
        return;
      }

      String::Value eventName(info[0]);
      auto str = *eventName;

      if ((NodeRT::Utils::CaseInsenstiveEquals(L"batteryStatusChanged", str)) &&(NodeRT::Utils::CaseInsenstiveEquals(L"energySaverStatusChanged", str)) &&(NodeRT::Utils::CaseInsenstiveEquals(L"powerSupplyStatusChanged", str)) &&(NodeRT::Utils::CaseInsenstiveEquals(L"remainingChargePercentChanged", str)) &&(NodeRT::Utils::CaseInsenstiveEquals(L"remainingDischargeTimeChanged", str)))
      {
        Nan::ThrowError(Nan::Error(String::Concat(NodeRT::Utils::NewString(L"given event name isn't supported: "), info[0].As<String>())));
        return;
      }

      Local<Function> callback = info[1].As<Function>();
      Local<Value> tokenMap = NodeRT::Utils::GetHiddenValue(callback, Nan::New<String>(REGISTRATION_TOKEN_MAP_PROPERTY_NAME).ToLocalChecked());
                
      if (tokenMap.IsEmpty() || Nan::Equals(tokenMap, Undefined()).FromMaybe(false))
      {
        return;
      }

      Local<Value> opaqueWrapperObj =  Nan::Get(Nan::To<Object>(tokenMap).ToLocalChecked(), info[0]).ToLocalChecked();

      if (opaqueWrapperObj.IsEmpty() || Nan::Equals(opaqueWrapperObj,Undefined()).FromMaybe(false))
      {
        return;
      }

      OpaqueWrapper *opaqueWrapper = OpaqueWrapper::Unwrap<OpaqueWrapper>(opaqueWrapperObj.As<Object>());
            
      long long tokenValue = (long long) opaqueWrapper->GetObjectInstance();
      ::Windows::Foundation::EventRegistrationToken registrationToken;
      registrationToken.Value = tokenValue;
        
      try 
      {
        if (NodeRT::Utils::CaseInsenstiveEquals(L"batteryStatusChanged", str))
        {
          ::Windows::System::Power::PowerManager::BatteryStatusChanged::remove(registrationToken);
        }
        else if (NodeRT::Utils::CaseInsenstiveEquals(L"energySaverStatusChanged", str))
        {
          ::Windows::System::Power::PowerManager::EnergySaverStatusChanged::remove(registrationToken);
        }
        else if (NodeRT::Utils::CaseInsenstiveEquals(L"powerSupplyStatusChanged", str))
        {
          ::Windows::System::Power::PowerManager::PowerSupplyStatusChanged::remove(registrationToken);
        }
        else if (NodeRT::Utils::CaseInsenstiveEquals(L"remainingChargePercentChanged", str))
        {
          ::Windows::System::Power::PowerManager::RemainingChargePercentChanged::remove(registrationToken);
        }
        else if (NodeRT::Utils::CaseInsenstiveEquals(L"remainingDischargeTimeChanged", str))
        {
          ::Windows::System::Power::PowerManager::RemainingDischargeTimeChanged::remove(registrationToken);
        }
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
      }

      Nan::Delete(Nan::To<Object>(tokenMap).ToLocalChecked(), Nan::To<String>(info[0]).ToLocalChecked());
    }
  private:
    ::Windows::System::Power::PowerManager^ _instance;
    static Persistent<FunctionTemplate> s_constructorTemplate;

    friend v8::Local<v8::Value> WrapPowerManager(::Windows::System::Power::PowerManager^ wintRtInstance);
    friend ::Windows::System::Power::PowerManager^ UnwrapPowerManager(Local<Value> value);
  };
  Persistent<FunctionTemplate> PowerManager::s_constructorTemplate;

  v8::Local<v8::Value> WrapPowerManager(::Windows::System::Power::PowerManager^ winRtInstance)
  {
    EscapableHandleScope scope;

    if (winRtInstance == nullptr)
    {
      return scope.Escape(Undefined());
    }

    Local<Value> opaqueWrapper = CreateOpaqueWrapper(winRtInstance);
    Local<Value> args[] = {opaqueWrapper};
    Local<FunctionTemplate> localRef = Nan::New<FunctionTemplate>(PowerManager::s_constructorTemplate);
    return scope.Escape(Nan::NewInstance(Nan::GetFunction(localRef).ToLocalChecked(),_countof(args), args).ToLocalChecked());
  }

  ::Windows::System::Power::PowerManager^ UnwrapPowerManager(Local<Value> value)
  {
     return PowerManager::Unwrap<PowerManager>(Nan::To<Object>(value).ToLocalChecked())->_instance;
  }

  void InitPowerManager(Local<Object> exports)
  {
    PowerManager::Init(exports);
  }

  class BackgroundEnergyManager : public WrapperBase
  {
  public:    
    static void Init(const Local<Object> exports)
    {
      HandleScope scope;
      
      Local<FunctionTemplate> localRef = Nan::New<FunctionTemplate>(New);
      s_constructorTemplate.Reset(localRef);
      localRef->SetClassName(Nan::New<String>("BackgroundEnergyManager").ToLocalChecked());
      localRef->InstanceTemplate()->SetInternalFieldCount(1);
      
                              
      Local<Object> constructor = Nan::To<Object>(Nan::GetFunction(localRef).ToLocalChecked()).ToLocalChecked();
	  Nan::SetMethod(constructor, "castFrom", CastFrom);

      Nan::SetAccessor(constructor, Nan::New<String>("excessiveUsageLevel").ToLocalChecked(), ExcessiveUsageLevelGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("lowUsageLevel").ToLocalChecked(), LowUsageLevelGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("maxAcceptableUsageLevel").ToLocalChecked(), MaxAcceptableUsageLevelGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("nearMaxAcceptableUsageLevel").ToLocalChecked(), NearMaxAcceptableUsageLevelGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("nearTerminationUsageLevel").ToLocalChecked(), NearTerminationUsageLevelGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("recentEnergyUsage").ToLocalChecked(), RecentEnergyUsageGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("recentEnergyUsageLevel").ToLocalChecked(), RecentEnergyUsageLevelGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("terminationUsageLevel").ToLocalChecked(), TerminationUsageLevelGetter);
      
      Local<Function> addListenerFunc = Nan::GetFunction(Nan::New<FunctionTemplate>(AddListener)).ToLocalChecked();
      Nan::Set(constructor, Nan::New<String>("addListener").ToLocalChecked(), addListenerFunc);
      Nan::Set(constructor, Nan::New<String>("on").ToLocalChecked(), addListenerFunc);
      Local<Function> removeListenerFunc = Nan::GetFunction(Nan::New<FunctionTemplate>(RemoveListener)).ToLocalChecked();
      Nan::Set(constructor, Nan::New<String>("removeListener").ToLocalChecked(), removeListenerFunc);
      Nan::Set(constructor, Nan::New<String>("off").ToLocalChecked(), removeListenerFunc);

      Nan::Set(exports, Nan::New<String>("BackgroundEnergyManager").ToLocalChecked(), constructor);
    }


    virtual ::Platform::Object^ GetObjectInstance() const override
    {
      return _instance;
    }

  private:
    
    BackgroundEnergyManager(::Windows::System::Power::BackgroundEnergyManager^ instance)
    {
      _instance = instance;
    }
    
    
    static void New(Nan::NAN_METHOD_ARGS_TYPE info)
    {
      HandleScope scope;

	    Local<FunctionTemplate> localRef = Nan::New<FunctionTemplate>(s_constructorTemplate);

      // in case the constructor was called without the new operator
      if (!localRef->HasInstance(info.This()))
      {
        if (info.Length() > 0)
        {
          std::unique_ptr<Local<Value> []> constructorArgs(new Local<Value>[info.Length()]);

          Local<Value> *argsPtr = constructorArgs.get();
          for (int i = 0; i < info.Length(); i++)
          {
            argsPtr[i] = info[i];
          }

		  MaybeLocal<Object> res = Nan::NewInstance(Nan::GetFunction(localRef).ToLocalChecked(), info.Length(), constructorArgs.get());
		  if (res.IsEmpty())
		  {
			  return;
		  }
		  info.GetReturnValue().Set(res.ToLocalChecked());
		  return;
		}
		else
		{
          MaybeLocal<Object> res = Nan::NewInstance(Nan::GetFunction(localRef).ToLocalChecked(), info.Length(), nullptr);
          if (res.IsEmpty())
          {
            return;
          }
          info.GetReturnValue().Set(res.ToLocalChecked());
          return;
        }
      }
      
      ::Windows::System::Power::BackgroundEnergyManager^ winRtInstance;


      if (info.Length() == 1 && OpaqueWrapper::IsOpaqueWrapper(info[0]) &&
        NodeRT::Utils::IsWinRtWrapperOf<::Windows::System::Power::BackgroundEnergyManager^>(info[0]))
      {
        try 
        {
          winRtInstance = (::Windows::System::Power::BackgroundEnergyManager^) NodeRT::Utils::GetObjectInstance(info[0]);
        }
        catch (Platform::Exception ^exception)
        {
          NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
          return;
        }
      }
      else
      {
        Nan::ThrowError(Nan::Error(NodeRT::Utils::NewString(L"Invalid arguments, no suitable constructor found")));
	    	return;
      }

      NodeRT::Utils::SetHiddenValue(info.This(), Nan::New<String>("__winRtInstance__").ToLocalChecked(), True());

      BackgroundEnergyManager *wrapperInstance = new BackgroundEnergyManager(winRtInstance);
      wrapperInstance->Wrap(info.This());

      info.GetReturnValue().Set(info.This());
    }


	
    static void CastFrom(Nan::NAN_METHOD_ARGS_TYPE info)
    {
		HandleScope scope;
		if (info.Length() < 1 || !NodeRT::Utils::IsWinRtWrapperOf<::Windows::System::Power::BackgroundEnergyManager^>(info[0]))
		{
			Nan::ThrowError(Nan::Error(NodeRT::Utils::NewString(L"Invalid arguments, no object provided, or given object could not be casted to requested type")));
			return;
		}

		::Windows::System::Power::BackgroundEnergyManager^ winRtInstance;
		try
		{
			winRtInstance = (::Windows::System::Power::BackgroundEnergyManager^) NodeRT::Utils::GetObjectInstance(info[0]);
		}
		catch (Platform::Exception ^exception)
		{
			NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
			return;
		}

		info.GetReturnValue().Set(WrapBackgroundEnergyManager(winRtInstance));
    }


  




    static void ExcessiveUsageLevelGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        unsigned int result = ::Windows::System::Power::BackgroundEnergyManager::ExcessiveUsageLevel;
        info.GetReturnValue().Set(Nan::New<Integer>(result));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void LowUsageLevelGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        unsigned int result = ::Windows::System::Power::BackgroundEnergyManager::LowUsageLevel;
        info.GetReturnValue().Set(Nan::New<Integer>(result));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void MaxAcceptableUsageLevelGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        unsigned int result = ::Windows::System::Power::BackgroundEnergyManager::MaxAcceptableUsageLevel;
        info.GetReturnValue().Set(Nan::New<Integer>(result));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void NearMaxAcceptableUsageLevelGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        unsigned int result = ::Windows::System::Power::BackgroundEnergyManager::NearMaxAcceptableUsageLevel;
        info.GetReturnValue().Set(Nan::New<Integer>(result));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void NearTerminationUsageLevelGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        unsigned int result = ::Windows::System::Power::BackgroundEnergyManager::NearTerminationUsageLevel;
        info.GetReturnValue().Set(Nan::New<Integer>(result));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void RecentEnergyUsageGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        unsigned int result = ::Windows::System::Power::BackgroundEnergyManager::RecentEnergyUsage;
        info.GetReturnValue().Set(Nan::New<Integer>(result));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void RecentEnergyUsageLevelGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        unsigned int result = ::Windows::System::Power::BackgroundEnergyManager::RecentEnergyUsageLevel;
        info.GetReturnValue().Set(Nan::New<Integer>(result));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void TerminationUsageLevelGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        unsigned int result = ::Windows::System::Power::BackgroundEnergyManager::TerminationUsageLevel;
        info.GetReturnValue().Set(Nan::New<Integer>(result));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    

    static void AddListener(Nan::NAN_METHOD_ARGS_TYPE info)
    {
      HandleScope scope;

      if (info.Length() < 2 || !info[0]->IsString() || !info[1]->IsFunction())
      {
        Nan::ThrowError(Nan::Error(NodeRT::Utils::NewString(L"wrong arguments, expected arguments are eventName(string),callback(function)")));
		return;
      }

      String::Value eventName(info[0]);
      auto str = *eventName;
      
      Local<Function> callback = info[1].As<Function>();
      
      ::Windows::Foundation::EventRegistrationToken registrationToken;
      if (NodeRT::Utils::CaseInsenstiveEquals(L"recentEnergyUsageIncreased", str))
      {
      
        try
        {
          Persistent<Object>* perstPtr = new Persistent<Object>();
          perstPtr->Reset(NodeRT::Utils::CreateCallbackObjectInDomain(callback));
          std::shared_ptr<Persistent<Object>> callbackObjPtr(perstPtr, 
            [] (Persistent<Object> *ptr ) {
              NodeUtils::Async::RunOnMain([ptr]() {
                ptr->Reset();
                delete ptr;
            });
          });

          registrationToken = ::Windows::System::Power::BackgroundEnergyManager::RecentEnergyUsageIncreased::add(
            ref new ::Windows::Foundation::EventHandler<::Platform::Object^>(
            [callbackObjPtr](::Platform::Object^ arg0, ::Platform::Object^ arg1) {
              NodeUtils::Async::RunOnMain([callbackObjPtr , arg0, arg1]() {
           	    HandleScope scope;
                TryCatch tryCatch;
              
                Local<Value> error;

                Local<Value> wrappedArg0 = CreateOpaqueWrapper(arg0);
                Local<Value> wrappedArg1 = CreateOpaqueWrapper(arg1);

                if (tryCatch.HasCaught())
                {
                  error = Nan::To<Object>(tryCatch.Exception()).ToLocalChecked();
                }
                else 
                {
                  error = Undefined();
                }

				// TODO: this is ugly! Needed due to the possibility of expception occuring inside object convertors
				// can be fixed by wrapping the conversion code in a function and calling it on the fly
				// we must clear the try catch block here so the invoked inner method exception won't get swollen (issue #52) 
				tryCatch.~TryCatch();


                if (wrappedArg0.IsEmpty()) wrappedArg0 = Undefined();
                if (wrappedArg1.IsEmpty()) wrappedArg1 = Undefined();

                Local<Value> args[] = { wrappedArg0, wrappedArg1 };
                Local<Object> callbackObjLocalRef = Nan::New<Object>(*callbackObjPtr);
                NodeRT::Utils::CallCallbackInDomain(callbackObjLocalRef, _countof(args), args);
              });
            })
          );
        }
        catch (Platform::Exception ^exception)
        {
          NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
          return;
        }

      }
      else if (NodeRT::Utils::CaseInsenstiveEquals(L"recentEnergyUsageReturnedToLow", str))
      {
      
        try
        {
          Persistent<Object>* perstPtr = new Persistent<Object>();
          perstPtr->Reset(NodeRT::Utils::CreateCallbackObjectInDomain(callback));
          std::shared_ptr<Persistent<Object>> callbackObjPtr(perstPtr, 
            [] (Persistent<Object> *ptr ) {
              NodeUtils::Async::RunOnMain([ptr]() {
                ptr->Reset();
                delete ptr;
            });
          });

          registrationToken = ::Windows::System::Power::BackgroundEnergyManager::RecentEnergyUsageReturnedToLow::add(
            ref new ::Windows::Foundation::EventHandler<::Platform::Object^>(
            [callbackObjPtr](::Platform::Object^ arg0, ::Platform::Object^ arg1) {
              NodeUtils::Async::RunOnMain([callbackObjPtr , arg0, arg1]() {
           	    HandleScope scope;
                TryCatch tryCatch;
              
                Local<Value> error;

                Local<Value> wrappedArg0 = CreateOpaqueWrapper(arg0);
                Local<Value> wrappedArg1 = CreateOpaqueWrapper(arg1);

                if (tryCatch.HasCaught())
                {
                  error = Nan::To<Object>(tryCatch.Exception()).ToLocalChecked();
                }
                else 
                {
                  error = Undefined();
                }

				// TODO: this is ugly! Needed due to the possibility of expception occuring inside object convertors
				// can be fixed by wrapping the conversion code in a function and calling it on the fly
				// we must clear the try catch block here so the invoked inner method exception won't get swollen (issue #52) 
				tryCatch.~TryCatch();


                if (wrappedArg0.IsEmpty()) wrappedArg0 = Undefined();
                if (wrappedArg1.IsEmpty()) wrappedArg1 = Undefined();

                Local<Value> args[] = { wrappedArg0, wrappedArg1 };
                Local<Object> callbackObjLocalRef = Nan::New<Object>(*callbackObjPtr);
                NodeRT::Utils::CallCallbackInDomain(callbackObjLocalRef, _countof(args), args);
              });
            })
          );
        }
        catch (Platform::Exception ^exception)
        {
          NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
          return;
        }

      }
      else 
      {
        Nan::ThrowError(Nan::Error(String::Concat(NodeRT::Utils::NewString(L"given event name isn't supported: "), info[0].As<String>())));
		return;
      }

      Local<Value> tokenMapVal = NodeRT::Utils::GetHiddenValue(callback, Nan::New<String>(REGISTRATION_TOKEN_MAP_PROPERTY_NAME).ToLocalChecked());
      Local<Object> tokenMap;

      if (tokenMapVal.IsEmpty() || Nan::Equals(tokenMapVal, Undefined()).FromMaybe(false))
      {
        tokenMap = Nan::New<Object>();
        NodeRT::Utils::SetHiddenValueWithObject(callback, Nan::New<String>(REGISTRATION_TOKEN_MAP_PROPERTY_NAME).ToLocalChecked(), tokenMap);
      }
      else
      {
        tokenMap = Nan::To<Object>(tokenMapVal).ToLocalChecked();
      }

      Nan::Set(tokenMap, info[0], CreateOpaqueWrapper(::Windows::Foundation::PropertyValue::CreateInt64(registrationToken.Value)));
    }

    static void RemoveListener(Nan::NAN_METHOD_ARGS_TYPE info)
    {
      HandleScope scope;

      if (info.Length() < 2 || !info[0]->IsString() || !info[1]->IsFunction())
      {
        Nan::ThrowError(Nan::Error(NodeRT::Utils::NewString(L"wrong arguments, expected a string and a callback")));
        return;
      }

      String::Value eventName(info[0]);
      auto str = *eventName;

      if ((NodeRT::Utils::CaseInsenstiveEquals(L"recentEnergyUsageIncreased", str)) &&(NodeRT::Utils::CaseInsenstiveEquals(L"recentEnergyUsageReturnedToLow", str)))
      {
        Nan::ThrowError(Nan::Error(String::Concat(NodeRT::Utils::NewString(L"given event name isn't supported: "), info[0].As<String>())));
        return;
      }

      Local<Function> callback = info[1].As<Function>();
      Local<Value> tokenMap = NodeRT::Utils::GetHiddenValue(callback, Nan::New<String>(REGISTRATION_TOKEN_MAP_PROPERTY_NAME).ToLocalChecked());
                
      if (tokenMap.IsEmpty() || Nan::Equals(tokenMap, Undefined()).FromMaybe(false))
      {
        return;
      }

      Local<Value> opaqueWrapperObj =  Nan::Get(Nan::To<Object>(tokenMap).ToLocalChecked(), info[0]).ToLocalChecked();

      if (opaqueWrapperObj.IsEmpty() || Nan::Equals(opaqueWrapperObj,Undefined()).FromMaybe(false))
      {
        return;
      }

      OpaqueWrapper *opaqueWrapper = OpaqueWrapper::Unwrap<OpaqueWrapper>(opaqueWrapperObj.As<Object>());
            
      long long tokenValue = (long long) opaqueWrapper->GetObjectInstance();
      ::Windows::Foundation::EventRegistrationToken registrationToken;
      registrationToken.Value = tokenValue;
        
      try 
      {
        if (NodeRT::Utils::CaseInsenstiveEquals(L"recentEnergyUsageIncreased", str))
        {
          ::Windows::System::Power::BackgroundEnergyManager::RecentEnergyUsageIncreased::remove(registrationToken);
        }
        else if (NodeRT::Utils::CaseInsenstiveEquals(L"recentEnergyUsageReturnedToLow", str))
        {
          ::Windows::System::Power::BackgroundEnergyManager::RecentEnergyUsageReturnedToLow::remove(registrationToken);
        }
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
      }

      Nan::Delete(Nan::To<Object>(tokenMap).ToLocalChecked(), Nan::To<String>(info[0]).ToLocalChecked());
    }
  private:
    ::Windows::System::Power::BackgroundEnergyManager^ _instance;
    static Persistent<FunctionTemplate> s_constructorTemplate;

    friend v8::Local<v8::Value> WrapBackgroundEnergyManager(::Windows::System::Power::BackgroundEnergyManager^ wintRtInstance);
    friend ::Windows::System::Power::BackgroundEnergyManager^ UnwrapBackgroundEnergyManager(Local<Value> value);
  };
  Persistent<FunctionTemplate> BackgroundEnergyManager::s_constructorTemplate;

  v8::Local<v8::Value> WrapBackgroundEnergyManager(::Windows::System::Power::BackgroundEnergyManager^ winRtInstance)
  {
    EscapableHandleScope scope;

    if (winRtInstance == nullptr)
    {
      return scope.Escape(Undefined());
    }

    Local<Value> opaqueWrapper = CreateOpaqueWrapper(winRtInstance);
    Local<Value> args[] = {opaqueWrapper};
    Local<FunctionTemplate> localRef = Nan::New<FunctionTemplate>(BackgroundEnergyManager::s_constructorTemplate);
    return scope.Escape(Nan::NewInstance(Nan::GetFunction(localRef).ToLocalChecked(),_countof(args), args).ToLocalChecked());
  }

  ::Windows::System::Power::BackgroundEnergyManager^ UnwrapBackgroundEnergyManager(Local<Value> value)
  {
     return BackgroundEnergyManager::Unwrap<BackgroundEnergyManager>(Nan::To<Object>(value).ToLocalChecked())->_instance;
  }

  void InitBackgroundEnergyManager(Local<Object> exports)
  {
    BackgroundEnergyManager::Init(exports);
  }

  class ForegroundEnergyManager : public WrapperBase
  {
  public:    
    static void Init(const Local<Object> exports)
    {
      HandleScope scope;
      
      Local<FunctionTemplate> localRef = Nan::New<FunctionTemplate>(New);
      s_constructorTemplate.Reset(localRef);
      localRef->SetClassName(Nan::New<String>("ForegroundEnergyManager").ToLocalChecked());
      localRef->InstanceTemplate()->SetInternalFieldCount(1);
      
                              
      Local<Object> constructor = Nan::To<Object>(Nan::GetFunction(localRef).ToLocalChecked()).ToLocalChecked();
	  Nan::SetMethod(constructor, "castFrom", CastFrom);

      Nan::SetAccessor(constructor, Nan::New<String>("excessiveUsageLevel").ToLocalChecked(), ExcessiveUsageLevelGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("lowUsageLevel").ToLocalChecked(), LowUsageLevelGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("maxAcceptableUsageLevel").ToLocalChecked(), MaxAcceptableUsageLevelGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("nearMaxAcceptableUsageLevel").ToLocalChecked(), NearMaxAcceptableUsageLevelGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("recentEnergyUsage").ToLocalChecked(), RecentEnergyUsageGetter);
      Nan::SetAccessor(constructor, Nan::New<String>("recentEnergyUsageLevel").ToLocalChecked(), RecentEnergyUsageLevelGetter);
      
      Local<Function> addListenerFunc = Nan::GetFunction(Nan::New<FunctionTemplate>(AddListener)).ToLocalChecked();
      Nan::Set(constructor, Nan::New<String>("addListener").ToLocalChecked(), addListenerFunc);
      Nan::Set(constructor, Nan::New<String>("on").ToLocalChecked(), addListenerFunc);
      Local<Function> removeListenerFunc = Nan::GetFunction(Nan::New<FunctionTemplate>(RemoveListener)).ToLocalChecked();
      Nan::Set(constructor, Nan::New<String>("removeListener").ToLocalChecked(), removeListenerFunc);
      Nan::Set(constructor, Nan::New<String>("off").ToLocalChecked(), removeListenerFunc);

      Nan::Set(exports, Nan::New<String>("ForegroundEnergyManager").ToLocalChecked(), constructor);
    }


    virtual ::Platform::Object^ GetObjectInstance() const override
    {
      return _instance;
    }

  private:
    
    ForegroundEnergyManager(::Windows::System::Power::ForegroundEnergyManager^ instance)
    {
      _instance = instance;
    }
    
    
    static void New(Nan::NAN_METHOD_ARGS_TYPE info)
    {
      HandleScope scope;

	    Local<FunctionTemplate> localRef = Nan::New<FunctionTemplate>(s_constructorTemplate);

      // in case the constructor was called without the new operator
      if (!localRef->HasInstance(info.This()))
      {
        if (info.Length() > 0)
        {
          std::unique_ptr<Local<Value> []> constructorArgs(new Local<Value>[info.Length()]);

          Local<Value> *argsPtr = constructorArgs.get();
          for (int i = 0; i < info.Length(); i++)
          {
            argsPtr[i] = info[i];
          }

		  MaybeLocal<Object> res = Nan::NewInstance(Nan::GetFunction(localRef).ToLocalChecked(), info.Length(), constructorArgs.get());
		  if (res.IsEmpty())
		  {
			  return;
		  }
		  info.GetReturnValue().Set(res.ToLocalChecked());
		  return;
		}
		else
		{
          MaybeLocal<Object> res = Nan::NewInstance(Nan::GetFunction(localRef).ToLocalChecked(), info.Length(), nullptr);
          if (res.IsEmpty())
          {
            return;
          }
          info.GetReturnValue().Set(res.ToLocalChecked());
          return;
        }
      }
      
      ::Windows::System::Power::ForegroundEnergyManager^ winRtInstance;


      if (info.Length() == 1 && OpaqueWrapper::IsOpaqueWrapper(info[0]) &&
        NodeRT::Utils::IsWinRtWrapperOf<::Windows::System::Power::ForegroundEnergyManager^>(info[0]))
      {
        try 
        {
          winRtInstance = (::Windows::System::Power::ForegroundEnergyManager^) NodeRT::Utils::GetObjectInstance(info[0]);
        }
        catch (Platform::Exception ^exception)
        {
          NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
          return;
        }
      }
      else
      {
        Nan::ThrowError(Nan::Error(NodeRT::Utils::NewString(L"Invalid arguments, no suitable constructor found")));
	    	return;
      }

      NodeRT::Utils::SetHiddenValue(info.This(), Nan::New<String>("__winRtInstance__").ToLocalChecked(), True());

      ForegroundEnergyManager *wrapperInstance = new ForegroundEnergyManager(winRtInstance);
      wrapperInstance->Wrap(info.This());

      info.GetReturnValue().Set(info.This());
    }


	
    static void CastFrom(Nan::NAN_METHOD_ARGS_TYPE info)
    {
		HandleScope scope;
		if (info.Length() < 1 || !NodeRT::Utils::IsWinRtWrapperOf<::Windows::System::Power::ForegroundEnergyManager^>(info[0]))
		{
			Nan::ThrowError(Nan::Error(NodeRT::Utils::NewString(L"Invalid arguments, no object provided, or given object could not be casted to requested type")));
			return;
		}

		::Windows::System::Power::ForegroundEnergyManager^ winRtInstance;
		try
		{
			winRtInstance = (::Windows::System::Power::ForegroundEnergyManager^) NodeRT::Utils::GetObjectInstance(info[0]);
		}
		catch (Platform::Exception ^exception)
		{
			NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
			return;
		}

		info.GetReturnValue().Set(WrapForegroundEnergyManager(winRtInstance));
    }


  




    static void ExcessiveUsageLevelGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        unsigned int result = ::Windows::System::Power::ForegroundEnergyManager::ExcessiveUsageLevel;
        info.GetReturnValue().Set(Nan::New<Integer>(result));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void LowUsageLevelGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        unsigned int result = ::Windows::System::Power::ForegroundEnergyManager::LowUsageLevel;
        info.GetReturnValue().Set(Nan::New<Integer>(result));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void MaxAcceptableUsageLevelGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        unsigned int result = ::Windows::System::Power::ForegroundEnergyManager::MaxAcceptableUsageLevel;
        info.GetReturnValue().Set(Nan::New<Integer>(result));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void NearMaxAcceptableUsageLevelGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        unsigned int result = ::Windows::System::Power::ForegroundEnergyManager::NearMaxAcceptableUsageLevel;
        info.GetReturnValue().Set(Nan::New<Integer>(result));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void RecentEnergyUsageGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        unsigned int result = ::Windows::System::Power::ForegroundEnergyManager::RecentEnergyUsage;
        info.GetReturnValue().Set(Nan::New<Integer>(result));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    
    static void RecentEnergyUsageLevelGetter(Local<String> property, const Nan::PropertyCallbackInfo<v8::Value> &info)
    {
      HandleScope scope;

      try 
      {
        unsigned int result = ::Windows::System::Power::ForegroundEnergyManager::RecentEnergyUsageLevel;
        info.GetReturnValue().Set(Nan::New<Integer>(result));
        return;
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
        return;
      }
    }
    

    static void AddListener(Nan::NAN_METHOD_ARGS_TYPE info)
    {
      HandleScope scope;

      if (info.Length() < 2 || !info[0]->IsString() || !info[1]->IsFunction())
      {
        Nan::ThrowError(Nan::Error(NodeRT::Utils::NewString(L"wrong arguments, expected arguments are eventName(string),callback(function)")));
		return;
      }

      String::Value eventName(info[0]);
      auto str = *eventName;
      
      Local<Function> callback = info[1].As<Function>();
      
      ::Windows::Foundation::EventRegistrationToken registrationToken;
      if (NodeRT::Utils::CaseInsenstiveEquals(L"recentEnergyUsageIncreased", str))
      {
      
        try
        {
          Persistent<Object>* perstPtr = new Persistent<Object>();
          perstPtr->Reset(NodeRT::Utils::CreateCallbackObjectInDomain(callback));
          std::shared_ptr<Persistent<Object>> callbackObjPtr(perstPtr, 
            [] (Persistent<Object> *ptr ) {
              NodeUtils::Async::RunOnMain([ptr]() {
                ptr->Reset();
                delete ptr;
            });
          });

          registrationToken = ::Windows::System::Power::ForegroundEnergyManager::RecentEnergyUsageIncreased::add(
            ref new ::Windows::Foundation::EventHandler<::Platform::Object^>(
            [callbackObjPtr](::Platform::Object^ arg0, ::Platform::Object^ arg1) {
              NodeUtils::Async::RunOnMain([callbackObjPtr , arg0, arg1]() {
           	    HandleScope scope;
                TryCatch tryCatch;
              
                Local<Value> error;

                Local<Value> wrappedArg0 = CreateOpaqueWrapper(arg0);
                Local<Value> wrappedArg1 = CreateOpaqueWrapper(arg1);

                if (tryCatch.HasCaught())
                {
                  error = Nan::To<Object>(tryCatch.Exception()).ToLocalChecked();
                }
                else 
                {
                  error = Undefined();
                }

				// TODO: this is ugly! Needed due to the possibility of expception occuring inside object convertors
				// can be fixed by wrapping the conversion code in a function and calling it on the fly
				// we must clear the try catch block here so the invoked inner method exception won't get swollen (issue #52) 
				tryCatch.~TryCatch();


                if (wrappedArg0.IsEmpty()) wrappedArg0 = Undefined();
                if (wrappedArg1.IsEmpty()) wrappedArg1 = Undefined();

                Local<Value> args[] = { wrappedArg0, wrappedArg1 };
                Local<Object> callbackObjLocalRef = Nan::New<Object>(*callbackObjPtr);
                NodeRT::Utils::CallCallbackInDomain(callbackObjLocalRef, _countof(args), args);
              });
            })
          );
        }
        catch (Platform::Exception ^exception)
        {
          NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
          return;
        }

      }
      else if (NodeRT::Utils::CaseInsenstiveEquals(L"recentEnergyUsageReturnedToLow", str))
      {
      
        try
        {
          Persistent<Object>* perstPtr = new Persistent<Object>();
          perstPtr->Reset(NodeRT::Utils::CreateCallbackObjectInDomain(callback));
          std::shared_ptr<Persistent<Object>> callbackObjPtr(perstPtr, 
            [] (Persistent<Object> *ptr ) {
              NodeUtils::Async::RunOnMain([ptr]() {
                ptr->Reset();
                delete ptr;
            });
          });

          registrationToken = ::Windows::System::Power::ForegroundEnergyManager::RecentEnergyUsageReturnedToLow::add(
            ref new ::Windows::Foundation::EventHandler<::Platform::Object^>(
            [callbackObjPtr](::Platform::Object^ arg0, ::Platform::Object^ arg1) {
              NodeUtils::Async::RunOnMain([callbackObjPtr , arg0, arg1]() {
           	    HandleScope scope;
                TryCatch tryCatch;
              
                Local<Value> error;

                Local<Value> wrappedArg0 = CreateOpaqueWrapper(arg0);
                Local<Value> wrappedArg1 = CreateOpaqueWrapper(arg1);

                if (tryCatch.HasCaught())
                {
                  error = Nan::To<Object>(tryCatch.Exception()).ToLocalChecked();
                }
                else 
                {
                  error = Undefined();
                }

				// TODO: this is ugly! Needed due to the possibility of expception occuring inside object convertors
				// can be fixed by wrapping the conversion code in a function and calling it on the fly
				// we must clear the try catch block here so the invoked inner method exception won't get swollen (issue #52) 
				tryCatch.~TryCatch();


                if (wrappedArg0.IsEmpty()) wrappedArg0 = Undefined();
                if (wrappedArg1.IsEmpty()) wrappedArg1 = Undefined();

                Local<Value> args[] = { wrappedArg0, wrappedArg1 };
                Local<Object> callbackObjLocalRef = Nan::New<Object>(*callbackObjPtr);
                NodeRT::Utils::CallCallbackInDomain(callbackObjLocalRef, _countof(args), args);
              });
            })
          );
        }
        catch (Platform::Exception ^exception)
        {
          NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
          return;
        }

      }
      else 
      {
        Nan::ThrowError(Nan::Error(String::Concat(NodeRT::Utils::NewString(L"given event name isn't supported: "), info[0].As<String>())));
		return;
      }

      Local<Value> tokenMapVal = NodeRT::Utils::GetHiddenValue(callback, Nan::New<String>(REGISTRATION_TOKEN_MAP_PROPERTY_NAME).ToLocalChecked());
      Local<Object> tokenMap;

      if (tokenMapVal.IsEmpty() || Nan::Equals(tokenMapVal, Undefined()).FromMaybe(false))
      {
        tokenMap = Nan::New<Object>();
        NodeRT::Utils::SetHiddenValueWithObject(callback, Nan::New<String>(REGISTRATION_TOKEN_MAP_PROPERTY_NAME).ToLocalChecked(), tokenMap);
      }
      else
      {
        tokenMap = Nan::To<Object>(tokenMapVal).ToLocalChecked();
      }

      Nan::Set(tokenMap, info[0], CreateOpaqueWrapper(::Windows::Foundation::PropertyValue::CreateInt64(registrationToken.Value)));
    }

    static void RemoveListener(Nan::NAN_METHOD_ARGS_TYPE info)
    {
      HandleScope scope;

      if (info.Length() < 2 || !info[0]->IsString() || !info[1]->IsFunction())
      {
        Nan::ThrowError(Nan::Error(NodeRT::Utils::NewString(L"wrong arguments, expected a string and a callback")));
        return;
      }

      String::Value eventName(info[0]);
      auto str = *eventName;

      if ((NodeRT::Utils::CaseInsenstiveEquals(L"recentEnergyUsageIncreased", str)) &&(NodeRT::Utils::CaseInsenstiveEquals(L"recentEnergyUsageReturnedToLow", str)))
      {
        Nan::ThrowError(Nan::Error(String::Concat(NodeRT::Utils::NewString(L"given event name isn't supported: "), info[0].As<String>())));
        return;
      }

      Local<Function> callback = info[1].As<Function>();
      Local<Value> tokenMap = NodeRT::Utils::GetHiddenValue(callback, Nan::New<String>(REGISTRATION_TOKEN_MAP_PROPERTY_NAME).ToLocalChecked());
                
      if (tokenMap.IsEmpty() || Nan::Equals(tokenMap, Undefined()).FromMaybe(false))
      {
        return;
      }

      Local<Value> opaqueWrapperObj =  Nan::Get(Nan::To<Object>(tokenMap).ToLocalChecked(), info[0]).ToLocalChecked();

      if (opaqueWrapperObj.IsEmpty() || Nan::Equals(opaqueWrapperObj,Undefined()).FromMaybe(false))
      {
        return;
      }

      OpaqueWrapper *opaqueWrapper = OpaqueWrapper::Unwrap<OpaqueWrapper>(opaqueWrapperObj.As<Object>());
            
      long long tokenValue = (long long) opaqueWrapper->GetObjectInstance();
      ::Windows::Foundation::EventRegistrationToken registrationToken;
      registrationToken.Value = tokenValue;
        
      try 
      {
        if (NodeRT::Utils::CaseInsenstiveEquals(L"recentEnergyUsageIncreased", str))
        {
          ::Windows::System::Power::ForegroundEnergyManager::RecentEnergyUsageIncreased::remove(registrationToken);
        }
        else if (NodeRT::Utils::CaseInsenstiveEquals(L"recentEnergyUsageReturnedToLow", str))
        {
          ::Windows::System::Power::ForegroundEnergyManager::RecentEnergyUsageReturnedToLow::remove(registrationToken);
        }
      }
      catch (Platform::Exception ^exception)
      {
        NodeRT::Utils::ThrowWinRtExceptionInJs(exception);
      }

      Nan::Delete(Nan::To<Object>(tokenMap).ToLocalChecked(), Nan::To<String>(info[0]).ToLocalChecked());
    }
  private:
    ::Windows::System::Power::ForegroundEnergyManager^ _instance;
    static Persistent<FunctionTemplate> s_constructorTemplate;

    friend v8::Local<v8::Value> WrapForegroundEnergyManager(::Windows::System::Power::ForegroundEnergyManager^ wintRtInstance);
    friend ::Windows::System::Power::ForegroundEnergyManager^ UnwrapForegroundEnergyManager(Local<Value> value);
  };
  Persistent<FunctionTemplate> ForegroundEnergyManager::s_constructorTemplate;

  v8::Local<v8::Value> WrapForegroundEnergyManager(::Windows::System::Power::ForegroundEnergyManager^ winRtInstance)
  {
    EscapableHandleScope scope;

    if (winRtInstance == nullptr)
    {
      return scope.Escape(Undefined());
    }

    Local<Value> opaqueWrapper = CreateOpaqueWrapper(winRtInstance);
    Local<Value> args[] = {opaqueWrapper};
    Local<FunctionTemplate> localRef = Nan::New<FunctionTemplate>(ForegroundEnergyManager::s_constructorTemplate);
    return scope.Escape(Nan::NewInstance(Nan::GetFunction(localRef).ToLocalChecked(),_countof(args), args).ToLocalChecked());
  }

  ::Windows::System::Power::ForegroundEnergyManager^ UnwrapForegroundEnergyManager(Local<Value> value)
  {
     return ForegroundEnergyManager::Unwrap<ForegroundEnergyManager>(Nan::To<Object>(value).ToLocalChecked())->_instance;
  }

  void InitForegroundEnergyManager(Local<Object> exports)
  {
    ForegroundEnergyManager::Init(exports);
  }

} } } } 

NAN_MODULE_INIT(init)
{
  // we ignore failures for now since it probably means that the initialization already happened for STA, and that's cool
  CoInitializeEx(nullptr, COINIT_MULTITHREADED);
  //if (FAILED(CoInitializeEx(nullptr, COINIT_MULTITHREADED)))
  /*{
    Nan::ThrowError(Nan::Error(NodeRT::Utils::NewString(L"error in CoInitializeEx()")));
    return;
  }*/
  
  NodeRT::Windows::System::Power::InitBatteryStatusEnum(target);
  NodeRT::Windows::System::Power::InitEnergySaverStatusEnum(target);
  NodeRT::Windows::System::Power::InitPowerSupplyStatusEnum(target);
  NodeRT::Windows::System::Power::InitPowerManager(target);
  NodeRT::Windows::System::Power::InitBackgroundEnergyManager(target);
  NodeRT::Windows::System::Power::InitForegroundEnergyManager(target);

  NodeRT::Utils::RegisterNameSpace("Windows.System.Power", target);
}


NODE_MODULE(binding, init)