#include <layer2/ham64.h>
#include <logger.h>

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

#include <arpa/inet.h>

int main(int argc, char **argv)
{
	logger_init();

	if(argc < 2) {
		LOG(LVL_FATAL, "Not enough arguments!");
		LOG(LVL_FATAL, "");
		LOG(LVL_FATAL, "usage: %s <callsign>", argv[0]);
		return EXIT_FAILURE;
	}

	const char *callsign = argv[1];

	size_t len = strlen(callsign);
	if(len > 12) {
		LOG(LVL_ERR, "Call sign too long: %zu chars (allowed: 12)", len);
		return EXIT_FAILURE;
	}

	ham64_t ham64;
	size_t encoded_len = ham64_encode(callsign, &ham64);

	if(encoded_len == 0) {
		LOG(LVL_ERR, "Encoding the call sign failed.");
		return EXIT_FAILURE;
	}

	LOG(LVL_INFO, "Call sign encoded successfully: %zu words.", encoded_len);

	char formatted[HAM64_FMT_MAX_LEN];
	ham64_format(&ham64, formatted);

	printf("ham64: %s\n", formatted);

	// calculate IPv6 address
	struct in6_addr ipv6_addr;
	memset(&ipv6_addr, 0, sizeof(struct in6_addr));

	// fill the host part from the ham64 address. The bytes are filled in
	// reverse order to make the „readable“ IPv6 address as short as possible.
	for(uint8_t i = 0; i < ham64.length; i++) {
		ipv6_addr.s6_addr[15 - 2*i] = (ham64.addr[i] >> 8) & 0xFF;
		ipv6_addr.s6_addr[14 - 2*i] = (ham64.addr[i] >> 0) & 0xFF;
	}

	// print the address
	char ipv6_str[INET6_ADDRSTRLEN];
	inet_ntop(AF_INET6, &ipv6_addr, ipv6_str, sizeof(ipv6_str));
	printf("ipv6:  %s\n", ipv6_str);
}