#ifndef FT_PING_H
# define FT_PING_H

#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netdb.h>
#include <byteswap.h>
#include <ctype.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/param.h>
#include <math.h>
#include <netinet/ip.h>

#include <fcntl.h>

#define PACKET_DATA_LENGTH 40

#define HELP_MESSAGE " [OPTION...] HOST ...\n\
Send ICMP ECHO_REQUEST packets to network hosts.\n\
\n\
  -c, --count=N		Stop after sending NUMBER packets\n\
      --ttl=N		Specify N as time-to-live\n\
  -i, --interval=N	Wait N seconds between sending each packet\n\
  -w, --timeout=N	Stop after N seconds\n\
  -W, --linger=N	Number of seconds to wait for response\n\
\n\
  -?, --help		Give this help list\n"

extern int g_stop;

typedef struct s_waitlist
{
	struct timeval		time;
	uint16_t			seq;
	struct s_waitlist	*next;
}	t_waitlist;

typedef struct s_host_list
{
	char *host;
	struct s_host_list *next;
}	t_host_list;

typedef struct s_settings
{
	t_host_list		*hosts;
	int				count;	// -c (--count)
	int				timeout; // -w (--timeout)
	double			interval; //-i (--interval)
	int				linger; //-W (--linger)
	int				ttl;	// --ttl
	short			setTtl; // is ttl set
	
	int				socket;
	uint16_t		id;
	short			stop;
	short			err;
	char			*name;
	struct timeval	last_send_time;

	char			current_ip[INET_ADDRSTRLEN];
}	t_settings;


typedef struct s_icmp_echo
{
	uint8_t			type;
	uint8_t			code;
	uint16_t		checksum;
	uint16_t		identifier; 
	uint16_t		sequence; 
	struct timeval	time; 
	uint8_t			data[40];
}	t_icmp_echo;

typedef struct  __attribute__((__packed__))
{
	struct iphdr header;
	t_icmp_echo icmp;
}	t_icmp_ip_reply;

typedef struct s_stats
{
	size_t	sent;
	size_t	received;

	double	min;
	double	avg;
	double	max;
	
	double	sqr_diff;
	double	prev;
} t_stats;

t_icmp_echo prepare_icmp_echo(uint16_t sequence, uint16_t identifier);
int add_host(t_settings *res, char *host);
void free_hosts(t_host_list *list);
t_settings parse_args(int argc, char **argv);
void show_help(t_settings *set, char *name);
void send_pings(t_settings *set);
uint16_t calc_checksum(void *ptr, size_t len);
double timediff(struct timeval *from);
void waitlist_remove(t_waitlist **lst, uint16_t seq, t_settings *set, t_stats *stats, uint8_t ttl);
void show_ping_res_line(t_waitlist *cur, t_settings *set, uint16_t seq, t_stats *stats, uint8_t ttl);
void waitlist_free(t_waitlist *lst);
t_waitlist *send_icmp(t_settings *set, struct addrinfo *host, uint16_t *seq, struct timeval *last, t_stats *stats);
void waitlist_add(t_waitlist **waitlist, t_waitlist *elem);
void receive_icmp(t_settings *set, struct addrinfo *info, t_waitlist **wl, t_stats *stats);

#endif