#include "timer.h"
#include <time.h>

int32 TTimer::MulDiv64(int64 nNumber, int64 nNumerator, int64 nDenominator) {
  return (int32) ((nNumber * nNumerator) / nDenominator);
}

TTimer::TTimer() {
  msOffset = 0;
    QueryPerformanceFrequency((LARGE_INTEGER*)&counterFrequency);
}

void TTimer::start(void) {
    QueryPerformanceCounter((LARGE_INTEGER*)&startValue);
}

int32 TTimer::getMs(void) {
    QueryPerformanceCounter((LARGE_INTEGER*)&actualValue);
  actualValue -= startValue;
    return MulDiv64(actualValue, 1000, counterFrequency) + msOffset;
}

void TTimer::setOffset(int32 offset) {
    msOffset = offset;
}

int32 TTimer::getPrecisionTimeCount(int32 precision) {
    QueryPerformanceCounter((LARGE_INTEGER*)&actualValue);
    actualValue -= startValue;
    return MulDiv64(actualValue, precision, counterFrequency);
}

int32 TTimer::getCurrentFrame(int32 totalframes, int32 totalms) {
    QueryPerformanceCounter((LARGE_INTEGER*)&actualValue);
    actualValue -= startValue;
    int32 t=MulDiv64(actualValue, 1000, counterFrequency)+msOffset;
    return MulDiv64(totalframes, t, totalms);
}

int32 TTimer::getTicks(void) {
    QueryPerformanceCounter((LARGE_INTEGER*)&actualValue);
    actualValue -= startValue;
    return (int32) actualValue;
}

int32 TTimer::getTicksPerSecond(void) {
    return (int32) counterFrequency/1000;

}