#include "stdafx.h"
#include "Timer.h"
#include "..\Minecraft.World\System.h"

Timer::Timer(float ticksPerSecond)
{
	// 4J - added initialisers
    lastTime = 0;
    ticks = 0;
    a = 0;
    timeScale = 1;
    passedTime = 0;
    accumMs = 0;
    adjustTime = 1.0;

    this->ticksPerSecond = ticksPerSecond;
    lastMs = System::currentTimeMillis();
    lastMsSysTime = System::nanoTime() / 1000000;
}

void Timer::advanceTime()
{
    int64_t nowNano = System::nanoTime();
    double nowSeconds = nowNano / 1000000000.0;
    
    static double lastFrameTime = nowSeconds;
    double elapsedSeconds = nowSeconds - lastFrameTime;
    lastFrameTime = nowSeconds;

    if (elapsedSeconds < 0) elapsedSeconds = 0;
    if (elapsedSeconds > 1.0) elapsedSeconds = 1.0;

    double frameDelta = elapsedSeconds * timeScale * ticksPerSecond;
    
    passedTime += static_cast<float>(frameDelta);

    ticks = static_cast<int>(passedTime);
    passedTime -= ticks;

    if (ticks > MAX_TICKS_PER_UPDATE)
        ticks = MAX_TICKS_PER_UPDATE;

    a = passedTime;
}

void Timer::advanceTimeQuickly()
{
    passedTime += static_cast<float>(MAX_TICKS_PER_UPDATE) * timeScale;

    ticks = static_cast<int>(passedTime);
    passedTime -= ticks;
    
    a = 0.0f; 

    lastMs = System::currentTimeMillis();
    
    lastMsSysTime = System::nanoTime() / 1000000;
}

void Timer::skipTime()
{
    int64_t nowNano = System::nanoTime();
    double nowSeconds = nowNano / 1000000000.0;

    lastMs = System::currentTimeMillis();
    lastMsSysTime = nowNano / 1000000;
    lastTime = nowSeconds;

    ticks = 0;
    passedTime = 0.0f;

    a = 0.0f;
}