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#include "dummycommon.h"

#ifdef Q_OS_WINCE
#include <windows.h>
// WINCE has <time.h> but using clock() gives a link error because
// the function isn't actually implemented.
#else
#include <time.h>
#endif

dummycommon::dummycommon(QSensor *sensor)
    : QSensorBackend(sensor)
    , m_timerid(0)
{
}

void dummycommon::start()
{
    if (m_timerid)
        return;

    int interval = 1000 / sensor()->dataRate();
    if (interval < 0)
        interval = 1000;

    if (interval)
        m_timerid = startTimer(interval);
}

void dummycommon::stop()
{
    if (m_timerid) {
        killTimer(m_timerid);
        m_timerid = 0;
    }
}

void dummycommon::timerEvent(QTimerEvent * /*event*/)
{
    poll();
}

qtimestamp getTimestamp()
{
#ifdef Q_OS_WINCE
    // This implementation is based on code found here:
    // http://social.msdn.microsoft.com/Forums/en/vssmartdevicesnative/thread/74870c6c-76c5-454c-8533-812cfca585f8
    HANDLE currentThread = GetCurrentThread();
    FILETIME creationTime, exitTime, kernalTime, userTime;
    GetThreadTimes(currentThread, &creationTime, &exitTime, &kernalTime, &userTime);

    ULARGE_INTEGER uli;
    uli.LowPart = userTime.dwLowDateTime;
    uli.HighPart = userTime.dwHighDateTime;
    ULONGLONG systemTimeInMS = uli.QuadPart/10000;
    return static_cast<qtimestamp>(systemTimeInMS);
#else
    return clock();
#endif
}