#include <stdio.h>
#include <stdlib.h>

#include <arpa/inet.h>

#include <time.h>

#include "messages.h"

void error(char *msg)
{
	printf("Error: %s\n", msg);
	exit(0);
}

void dump(const char *label, uint8_t *data, int len)
{
	int i;
	printf("%s: ", label);
	for (i = 0; i < len; i++)
		printf("%02hhx ", data[i]);
	printf("\n");
}

int main(int argc, char **argv)
{
	char *device = argv[1];
	if (!device)
		error("usage: host /dev/ttyACM0");

	header_t   head = {};
	sync_msg_t body = {};

	struct timespec ts;
	clock_gettime(CLOCK_REALTIME, &ts);

	head.header = MSG_HEADER;
	head.msgid  = MSG_ID_SYNC;
	head.length = sizeof(sync_msg_t);
	head.cksum  = 0; // todo

	body.seq    = 0;
	body.time.seconds = ts.tv_sec;
	body.time.nanosec = ts.tv_nsec;

	dump("head", (uint8_t*)&head, sizeof(head));
	dump("body", (uint8_t*)&body, sizeof(body));

	FILE *fd = fopen(device, "a+");
	if (!fd) error("opening device");
	int len = 0;
	len += fwrite(&head, 1, sizeof(head), fd);
	len += fwrite(&body, 1, sizeof(body), fd);
	fclose(fd);

	printf("wrote %d bytes\n", len);

	return 0;
}