class Timer {
private:
	int startTicks;
	int pausedTicks;
	bool paused;
	bool started;
public:
	Timer();
	void start();
	void stop();
	void pause();
	void unpause();
	int get_ticks();
	bool is_started();
	bool is_paused();
};

Timer::Timer() {
	startTicks = 0;
	pausedTicks = 0;
	paused = false;
	started = false;
}

void Timer::start() {
	started = true;
	paused = false;
	startTicks = SDL_GetTicks();
}

void Timer::stop() {
	started = false;
	paused = false;
}

void Timer::pause() {
	if((started == true) && (paused == false)) {
		paused = true;
		pausedTicks = SDL_GetTicks() - startTicks;
	}
}

void Timer::unpause() {
	if(paused == true) {
		paused = false;
		startTicks = SDL_GetTicks() - pausedTicks;
		pausedTicks = 0;
	}
}

int Timer::get_ticks() {
	if(started == true)
	{
		if(paused == true) {
			return pausedTicks;
		}
		else {
			return SDL_GetTicks() - startTicks;
		}
	}
	return 0;
}

bool Timer::is_started() {
	return started;
}

bool Timer::is_paused() {
	return paused;
}