/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   precise_timing.c                                   :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: ruiferna <ruiferna@student.42porto.com>    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/10/07 20:17:52 by ruiferna          #+#    #+#             */
/*   Updated: 2025/10/07 20:49:11 by ruiferna         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include <stdio.h>
#include <sys/time.h>
#include <unistd.h>

long long get_current_time()
{
	struct timeval tv;
	gettimeofday(&tv,NULL);
	/*
		A stuct tv tem tv_sec que sao os segundos desde a epoch e temos a tv_usec
		que retorna os microsegundos ate completar 1 segundo (um milhão de microssegundos = 1 segundo).
		Por isso, para conseguirmos realmente medir os milisegundos precisamos de juntar os dois
	*/
	return ((tv.tv_sec * 1000LL) + (tv.tv_usec / 1000LL));
}

long long time_diff(long long start, long long end)
{
	return (end - start);
}

void	precise_sleep(int ms)
{
	long long	start_time;

	start_time = get_current_time();
	while ((get_current_time() - start_time) < ms)
	{
		usleep(100);
	}
}

int main()
{
	long long start = get_current_time();
	precise_sleep(100);
	long long end = get_current_time();
	printf("Time difference: %lld ms", time_diff(start, end));
	return (0);
}