#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include "version_gen.h"
#include "icmp.h"
#include "internal/ping/output.h"
#include "internal/ping/scheduler.h"
#include "ping/ft_ping_const.h"
#include "ping/ft_ping_flags.h"

/* Forward declarations */
static inline void fill_payload(uint8_t *payload, size_t payload_len);
static int ping_send_one(struct ping_state *state, size_t payload_len);
/* -------------------- */

void
do_send(struct ping_state *state, size_t payload_len)
{
	state->send_flag = 0;
	if (0 != ping_send_one(state, payload_len))
		dprintf(STDERR_FILENO, "%s: %s\n",
				g_prog_name, icmp_strerror(state->handle));
	if (HAS_FLAG(state->config->flags, FLAG_FLOOD))
		ping_output_flood_dot();
	if (0 != ping_scheduler_arm(state->config))
	{
		dprintf(STDERR_FILENO, "%s: setitimer: %s\n",
				g_prog_name, strerror(errno));
		state->stop_flag = 1;
	}
}

static int
ping_send_one(struct ping_state *state, size_t payload_len)
{
	struct timespec	ts;
	uint8_t			payload[MAX_PACKET_SIZE];
	uint16_t		seq;

	fill_payload(payload, payload_len);
	if (0 != icmp_get_time(&ts))
		return -1;
	seq = state->seq++;
	if (0 != icmp_send_echo(state->handle,
			state->dest,
			state->id,
			seq,
			state->config->ttl,
			payload, payload_len))
		return -1;
	ping_tracker_record_send(state->tracker, seq, &ts);
	return 0;
}

static inline void
fill_payload(uint8_t *payload, size_t payload_len)
{
	for (size_t i = 0; i < payload_len; ++i)
		payload[i] = (uint8_t)('a' + (i % 26));
}