#include "TimeHelpers.h"
#include <windows.h>

namespace UnitTest {

Timer::Timer()
    : m_threadHandle(::GetCurrentThread())
    , m_startTime(0)
{
#if defined(_MSC_VER) && (_MSC_VER == 1200) // VC6 doesn't have DWORD_PTR?
    typedef unsigned long DWORD_PTR;
#endif

    DWORD_PTR systemMask;
    ::GetProcessAffinityMask(GetCurrentProcess(), &m_processAffinityMask, &systemMask);
    ::SetThreadAffinityMask(m_threadHandle, 1);
    ::QueryPerformanceFrequency(reinterpret_cast< LARGE_INTEGER* >(&m_frequency));
    ::SetThreadAffinityMask(m_threadHandle, m_processAffinityMask);
}

void Timer::Start()
{
    m_startTime = GetTime();
}

double Timer::GetTimeInMs() const
{
    __int64 const elapsedTime = GetTime() - m_startTime;
    double const seconds = double(elapsedTime) / double(m_frequency);
    return seconds * 1000.0;
}

__int64 Timer::GetTime() const
{
    LARGE_INTEGER curTime;
    ::SetThreadAffinityMask(m_threadHandle, 1);
    ::QueryPerformanceCounter(&curTime);
    ::SetThreadAffinityMask(m_threadHandle, m_processAffinityMask);
    return curTime.QuadPart;
}

void TimeHelpers::SleepMs(int const ms)
{
    ::Sleep(ms);
}

}

