// wrapper

import { log_from, sleep } from "./utils.ts";
import { ContainerConfigRedirection } from "./config.ts";

const log = log_from("nspawn");

export function container_command(name: string, directory: string, opts?: {
	veth?: boolean;
	boot?: boolean;
	redirections?: ContainerConfigRedirection[];
	cmd_opts?: Deno.CommandOptions;
	syscall_filter?: string[];
}) {
	const args = [
		`--machine=${name}`,
		`--directory=${directory}`,
	];
	if (opts?.veth ?? false) args.push("--network-veth");
	if (opts?.boot ?? false) args.push("--boot");
	for (const redir of opts?.redirections ?? []) {
		if (redir.kind === "http") args.push(`--port=${redir.port}`);
		if (redir.kind === "port") {
			args.push(`--port=tcp:${redir.from}:${redir.to}`);
			args.push(`--port=udp:${redir.from}:${redir.to}`);
		}
	}
	for (const call of opts?.syscall_filter ?? []) args.push(`--system-call-filter=${call}`);
	const command = new Deno.Command("systemd-nspawn", { ...opts?.cmd_opts, args });
	return command;
}

export async function get_container_addresses(name: string) {
	const command = new Deno.Command("machinectl", { args: ["status", name], stdout: "piped" });
	while (true) {
		await sleep(500);
		log("getting address of", name);
		const { code, stdout } = await command.output();
		if (code != 0) continue;
		const output = new TextDecoder().decode(stdout);
		const [_, rest] = output.split(" Address: ");
		if (rest === undefined) continue;
		const [raw] = rest.split(" OS: ");
		const addresses = raw.trim().split("\n").map((l) => l.trim());
		if (addresses.length === 0) continue;
		return addresses;
	}
}