/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_ping.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tomoron <tomoron@student.42angouleme.fr>   +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/04/26 19:54:25 by tomoron           #+#    #+#             */
/*   Updated: 2025/05/22 23:01:33 by tomoron          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "includes/ft_ping.h"

struct addrinfo *resolve_ip(char *host, t_settings *settings)
{
	struct addrinfo hints, *result;
    int s;
	struct addrinfo *ret;

    memset(&hints, 0, sizeof(hints));
	ret = 0;
    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_STREAM;

    s = getaddrinfo(host, NULL, &hints, &result);
    if (s != 0) {
        fprintf(stderr, "%s: %s\n",settings->name, gai_strerror(s));
        return(ret);
    }

	ret = result;
	if(!ret)
		return(ret);
	ret->ai_next = 0;
	result = result->ai_next;
	freeaddrinfo(result);
	return(ret);
}

void ping_start_print(t_settings *set, char *host)
{
	printf("PING %s (%s): 56 data bytes\n", host, set->current_ip);
}

void ping_end_print(t_settings *set, char *host, t_stats *stats)
{
	int		percent;
	double	stddev;

	if(set->err)
		return;
	(void)set;
	stddev = sqrt(stats->sqr_diff / (stats->received - 1));
	if(isnan(stddev) || isinf(stddev))
		stddev = 0.0f;
	printf("--- %s ping statistics ---\n", host);
	percent = ((double)(stats->sent - stats->received) / stats->sent) * 100.0;
	printf("%lu packets transmitted, %lu packets received, %d%% packet loss\n", stats->sent, stats->received, percent);
	printf("round-trip min/avg/max/stddev = %.3f/%.3f/%.3f/%.3f ms\n", stats->min, stats->avg, stats->max, stddev);
}

int ping_host(t_settings *set, char *host)
{
	uint16_t seq;
	struct addrinfo	*info;
	struct timeval	last_sent;
	t_waitlist		*wl;
	t_waitlist		*tmp;
	t_stats			stats;

	seq = 0;
	memset(&stats, 0, sizeof(t_stats));
	info = resolve_ip(host, set);
	if(!info)
		return(0);
	last_sent.tv_sec = 0;
	last_sent.tv_usec = 0;
	wl = 0;
	inet_ntop(info->ai_family, (void *)&((struct sockaddr_in *)(info->ai_addr))->sin_addr, set->current_ip, sizeof(set->current_ip));
	ping_start_print(set, host);	
	while((seq < set->count || set->count == -1) && !g_stop)
	{
		tmp = send_icmp(set, info, &seq, &last_sent, &stats);
		if(tmp)
			waitlist_add(&wl, tmp);
		usleep(100);
		receive_icmp(set, info, &wl, &stats);
	}
	while(wl && !g_stop && timediff(&set->last_send_time) < set->linger)
		receive_icmp(set, info, &wl, &stats);
	ping_end_print(set, host, &stats);
	freeaddrinfo(info);
	waitlist_free(wl);
	return(1);
}

void send_pings(t_settings *set)
{
	t_host_list *cur;

	cur = set->hosts;
	while(cur)
	{
		if(!ping_host(set, cur->host))
			return;
		cur = cur->next;
	}
}