export function pickToken (payload: any): string {
  const first = payload?.data ?? payload
  const nested = first?.data && typeof first.data === 'object' && ('token' in first.data || !first.token)
    ? first.data
    : first
  const token = nested?.token ?? first?.token ?? payload?.token
  return typeof token === 'string' ? token.trim() : ''
}

export async function ensureSessionToken (input: {
  token?: string
  fetchUserConfig: () => Promise<unknown>
}) {
  const existing = String(input.token || '').trim()
  if (existing) {
    return existing
  }

  const token = pickToken(await input.fetchUserConfig())
  if (!token) {
    throw new Error('获取临时登录态失败')
  }

  return token
}