///////////////////////////////////////////////////////////////////////
// SkeletonPlus.cpp - Gang of Four Singleton with reference counting //
// Ver 1.1                                                           //
// Jim Fawcett, CSE776 - Design Patterns, Fall 2017                  //
///////////////////////////////////////////////////////////////////////

#include "SkeletonPlus.h"
#include "../Utilities/Utilities.h"
#include <iostream>

Singleton* Singleton::Instance()
{
  ++refCount;
  if (pUniqueInstance == nullptr)
    pUniqueInstance = new Singleton();
  return pUniqueInstance;
}

Singleton::Singleton() 
{
  std::cout << "\n  creating singleton instance";
}

void Singleton::ReleaseInstance()
{
  if (--refCount == 0)
  {
    delete pUniqueInstance;
    pUniqueInstance = nullptr;
  }
}
Singleton::~Singleton()
{
  std::cout << "\n  destroying singleton instance\n";
}

void Singleton::SingletonOperation(const std::string& data)
{
  singletonData = data;
}

std::string Singleton::GetSingletonData()
{
  return singletonData;
}

int main()
{
  Utilities::title<'='>("Testing SkeletonPlus Singleton");

  Singleton* pInstance1 = Singleton::Instance();
  pInstance1->SingletonOperation("hello world");
  std::cout << "\n  instance has this data: " << pInstance1->GetSingletonData();

  Singleton* pInstance2 = Singleton::Instance();
  pInstance2->SingletonOperation("hello CSE776 world");
  std::cout << "\n  instance has this data: " << pInstance2->GetSingletonData();

  std::cout << "\n  address of instance1: " << reinterpret_cast<unsigned long int>(pInstance1);
  std::cout << "\n  address of instance2: " << reinterpret_cast<unsigned long int>(pInstance2);

  pInstance1->ReleaseInstance();
  pInstance2->ReleaseInstance();

  std::cout << "\n\n";
  return 0;
}