export interface GroupInfo {
  count: bigint
  first: bigint
  last: bigint
  name: string
}

/**
 * Parses a `211 count first last name` GROUP reply (RFC 3977 §6.1.1).
 *
 * nntp-js's own `group()` destructures this reply without skipping the status
 * code, so its `first`/`last` are off by one field. Pass it `result.resp`.
 */
export function parseGroupResponse(resp: string): GroupInfo {
  const match = /^211\s+(\d+)\s+(\d+)\s+(\d+)\s+(\S+)/.exec(resp.trim())
  if (!match) throw new Error(`Unexpected GROUP response: ${resp}`)
  return {
    count: BigInt(match[1]),
    first: BigInt(match[2]),
    last: BigInt(match[3]),
    name: match[4],
  }
}