import { createServer } from "node:http";
import { networkInterfaces } from "node:os";

const IONOS_TOKEN = process.env.IONOS_TOKEN;
const IPV4 = process.env.IPV4;
if (!IONOS_TOKEN || !IPV4) {
	console.error("Missing IONOS_TOKEN or IPV4 environment variable.");
	process.exit(1);
}
const IONOS_ENDPOINT = "https://ipv4.api.hosting.ionos.com/dns/v1/dyndns?q=" + IONOS_TOKEN + "&ipv4=" + IPV4;

function getMyIPv6() {
	const ifs = networkInterfaces();
	for (const name in ifs) {
		for (const iface of ifs[name]!) {
			if (iface.family === "IPv6" && !iface.internal) {
				return iface.address;
			}
		}
	}
	return null;
}

const server = createServer(async (req, res) => {
	const ipv6 = getMyIPv6();
	if (ipv6) {
		console.log(`My IPv6 address: ${ipv6}`);
	} else {
		console.error("No IPv6 address found.");
		res.writeHead(503);
		res.end("");
		return;
	}
	const ionos = await fetch(IONOS_ENDPOINT + "&ipv6=" + ipv6);
	if (!ionos.ok) {
		console.error("Failed to update IONOS DNS record:", ionos.statusText);
		res.writeHead(502);
		res.end("");
		return;
	}
	res.writeHead(200);
	res.end("");
});

const PORT = 10205;
server.listen(PORT, () => {
	console.log(`Server is running on http://localhost:${PORT}`);
});