// `mosaic hosts` (row 234, #1740, r6 E4): the broker's hosts.status, hosts.check and hosts.remove. The
// human runs all three. With --tester the tester's session runs them. check logs in as mosaic-installer
// and runs `list` on the host, then marks the host ready. remove drops a host no grant uses. Nothing here
// reads a key: the answers carry fingerprints only. Row 235 (#1741, r6 section 6, X3) adds revoke, which
// takes an agent's grant on a host away at once, and sweep, which removes the lines a failure left.
import { CliError } from "./errors.mjs";
import { orgSelector } from "./org-selector.mjs";

export const HOSTS_USAGE =
  "mosaic hosts [status] [--json] [--tester] [--business ID] | check|remove|sweep HOST [--tester] [--business ID] | revoke AGENT HOST --reason R [--tester] [--business ID]";

function parse(args) {
  const out = { positional: [], flags: new Set(), values: {} };
  // --org and --business are one selector in this parser's scope (rename design r2).
  const selector = orgSelector(() => new CliError(HOSTS_USAGE, 4));
  for (let i = 0; i < args.length; i++) {
    const arg = args[i];
    if (selector.owns(arg)) { selector.take(arg, args[i + 1]); i++; }
    else if (arg === "--json" || arg === "--tester") out.flags.add(arg);
    else if (arg === "--reason") {
      if (!args[i + 1] || Object.hasOwn(out.values, arg)) throw new CliError(HOSTS_USAGE, 4);
      out.values[arg] = args[++i];
    } else if (arg.startsWith("--")) throw new CliError(HOSTS_USAGE, 4);
    else out.positional.push(arg);
  }
  if (selector.given) out.values["--business"] = selector.value;
  return out;
}

const line = (h) =>
  [h.host, h.state, `${h.user}@${h.address}:${h.port}`, h.sudo ? "sudo" : "no-sudo", h.checkedAt ?? "unchecked",
    ...(h.hostLineLeft.length ? [`line left: ${h.hostLineLeft.join(" ")}`] : []),
    ...(h.revoking?.length ? [`revoking: ${h.revoking.join(" ")}`] : [])].join("\t");

export async function hostsCommand(args, io, callFor) {
  const parsed = parse(args);
  const [verb = "status", first, second, ...extra] = parsed.positional;
  const one = first !== undefined && second === undefined;
  const shape = { status: first === undefined, check: one, remove: one, sweep: one, revoke: second !== undefined };
  // N10: own keys only, so `constructor` or `toString` is a usage error, not a verb.
  if (extra.length || !Object.hasOwn(shape, verb) || !shape[verb] || (parsed.flags.has("--json") && verb !== "status") ||
    (verb === "revoke") !== Object.hasOwn(parsed.values, "--reason"))
    throw new CliError(HOSTS_USAGE, 4);
  try {
    const call = callFor(parsed);
    if (verb === "status") {
      const rows = await call("hosts.status", {});
      io.stdout.write(parsed.flags.has("--json") ? JSON.stringify(rows, null, 2) + "\n" : rows.map(line).join("\n") + (rows.length ? "\n" : ""));
      return;
    }
    const args = verb === "revoke" ? { agent: first, host: second, reason: parsed.values["--reason"] } : { host: first };
    io.stdout.write(JSON.stringify(await call(`hosts.${verb}`, args), null, 2) + "\n");
  } catch (error) {
    if (error instanceof CliError) throw error;
    throw new CliError(error.message, 2);
  }
}