/**
 * Pure argv helpers for hdms (no bare-crypto / hyperdrive) so brittle-node can test parsing.
 */

/**
 * @param {string[]} rest argv slice after `hdms pair`
 * @returns {{ ok: true, persist: boolean, inviteTok: string } | { ok: false, error: string }}
 */
export function parseHdmsPairArgv(rest) {
  let persist = true
  let inviteTok = null
  for (const x of rest) {
    if (x === '--persist') continue
    if (x === '--no-persist') {
      persist = false
      continue
    }
    if (String(x).startsWith('-')) {
      return { ok: false, error: 'hdms: unknown flag: ' + x }
    }
    if (inviteTok) {
      return { ok: false, error: 'hdms: pair expects a single invite string' }
    }
    inviteTok = x
  }
  if (rest.includes('--persist') && rest.includes('--no-persist')) {
    return {
      ok: false,
      error: 'hdms: pair: use only one of --persist and --no-persist'
    }
  }
  if (!inviteTok) {
    return {
      ok: false,
      error: 'hdms: Usage: hdms pair [--persist|--no-persist] <invite>'
    }
  }
  return { ok: true, persist, inviteTok }
}