/**
 * Hetzner Cloud API client for VPS provisioning.
 */

const HETZNER_API = "https://api.hetzner.cloud/v1";

function headers(): Record<string, string> {
	const token = process.env.HETZNER_API_TOKEN;
	if (!token) throw new Error("HETZNER_API_TOKEN not set");
	return {
		Authorization: `Bearer ${token}`,
		"Content-Type": "application/json",
	};
}

export interface HetznerServer {
	id: number;
	name: string;
	status: string;
	public_net: {
		ipv4: { ip: string };
		ipv6: { ip: string };
	};
	server_type: { name: string };
	datacenter: { name: string };
}

export async function createServer(opts: {
	name: string;
	serverType: string;
	region: string;
	userData: string;
}): Promise<{ serverId: string; ip: string }> {
	const res = await fetch(`${HETZNER_API}/servers`, {
		method: "POST",
		headers: headers(),
		body: JSON.stringify({
			name: opts.name,
			server_type: opts.serverType,
			location: opts.region,
			image: "ubuntu-22.04",
			user_data: opts.userData,
			start_after_create: true,
		}),
	});

	if (!res.ok) {
		const err = await res.text();
		throw new Error(`Hetzner create failed: ${res.status} ${err}`);
	}

	const data = await res.json();
	return {
		serverId: String(data.server.id),
		ip: data.server.public_net.ipv4.ip,
	};
}

export async function getServer(serverId: string): Promise<HetznerServer | null> {
	const res = await fetch(`${HETZNER_API}/servers/${serverId}`, { headers: headers() });
	if (!res.ok) return null;
	const data = await res.json();
	return data.server;
}

export async function deleteServer(serverId: string): Promise<boolean> {
	const res = await fetch(`${HETZNER_API}/servers/${serverId}`, {
		method: "DELETE",
		headers: headers(),
	});
	return res.ok;
}

export async function serverAction(serverId: string, action: "poweron" | "poweroff" | "reboot"): Promise<boolean> {
	const res = await fetch(`${HETZNER_API}/servers/${serverId}/actions/${action}`, {
		method: "POST",
		headers: headers(),
	});
	return res.ok;
}