/* ************************************************************************** */
/*                                                                            */
/*                                                  :::  o_   ::::::    :::   */
/*   client.c                                      :+:  /    :+::+:    :+:    */
/*                                                +:+   >   +:++:+    +:+     */
/*   By: whaffman <whaffman@student.codam.nl>    +#+  +:+  +#++#++:++#++      */
/*                                              +#+ +#+#+ +#++#+    +#+ \o/   */
/*   Created: 2024/07/18 16:28:03 by whaffman   #+#+# #+#+# #+#    #+#   |    */
/*   Updated: 2024/07/27 14:43:17 by whaffman   ###   ###  ###    ###   / \   */
/*                                                                            */
/* ************************************************************************** */

#include <signal.h>
#include <unistd.h>
#define SLEEP 100

static volatile int	g_ack = 0;

size_t	ft_strlen(const char *s)
{
	size_t	length;

	length = 0;
	while (*s++)
		length++;
	return (length);
}

void	ft_putstr(char *str)
{
	write(1, str, ft_strlen(str));
}

int	ft_isspace(int c)
{
	return (' ' == c || '\f' == c || '\n' == c
		|| '\r' == c || '\t' == c || '\v' == c);
}

int	ft_isdigit(char c)
{
	return (c >= '0' && c <= '9');
}

int	ft_atoi(const char *nptr)
{
	int	sign;
	int	res;

	while (ft_isspace(*nptr))
		nptr++;
	res = 0;
	sign = 1;
	while (*nptr == '-' || *nptr == '+')
	{
		if (*nptr == '-')
			sign *= -1;
		nptr++;
	}
	while (ft_isdigit(*nptr))
		res = 10 * res + sign * (*nptr++ - '0');
	return (res);
}

int	send_byte(int pid, unsigned char c)
{
	int	i;

	i = 0;
	while (i < 8)
	{
		if ((c & 128) == 128)
			kill(pid, SIGUSR1);
		else
			kill(pid, SIGUSR2);
		c = c << 1;
		usleep(SLEEP);
		while (!g_ack)
			pause();
		g_ack = 0;
		i++;
	}
	return (1);
}

int	send_message(int pid, char *msg)
{
	while (*msg)
	{
		send_byte(pid, *msg);
		msg++;
	}
	send_byte(pid, '\0');
	return (1);
}

void	sig(int signum)
{
	(void)signum;
	g_ack = 1;
}

int	main(int argc, char *argv[])
{
	int	pid;

	if (argc != 3)
		ft_putstr("Usage: ./client <pid> <message>");
	pid = ft_atoi(argv[1]);
	if (pid <= 1)
		return (1);
	g_ack = 0;
	signal(SIGUSR1, sig);
	send_message(pid, argv[2]);
	return (0);
}