function collectErrorText(err: unknown): string {
  const parts: string[] = []
  let cur: unknown = err
  let depth = 0
  while (cur != null && depth < 6) {
    if (typeof cur === 'string') {
      parts.push(cur)
      break
    }
    if (typeof cur === 'object') {
      const o = cur as Record<string, unknown>
      if (typeof o.message === 'string') parts.push(o.message)
      if (typeof o.name === 'string') parts.push(o.name)
      if (typeof o.code !== 'undefined') parts.push(String(o.code))
      cur = o.cause
    } else {
      parts.push(String(cur))
      break
    }
    depth++
  }
  return parts.join(' ').toLowerCase()
}

/** 腾讯云通话套餐/能力类错误常见码（如 wasm 日志 error_code:-1001） */
export const TUICALL_PACKAGE_ERROR_CODE = -1001

/** 是否为「套餐不含该能力 / 需续费」类错误（如 TUICallEngineError: The package you purchased does not support this ability） */
export function isTUICallPackageAbilityError(err: unknown): boolean {
  if (err && typeof err === 'object') {
    const o = err as Record<string, unknown>
    const code = o.code ?? o.error_code
    if (code === TUICALL_PACKAGE_ERROR_CODE || code === String(TUICALL_PACKAGE_ERROR_CODE)) {
      return true
    }
  }
  const text = collectErrorText(err)
  return (
    text.includes('does not support this ability') ||
    text.includes('package you purchased') ||
    (text.includes('-1001') && text.includes('does not support'))
  )
}

/** 用户可见短文案 */
export function getTUICallPackageArrearsMessage(): string {
  return '套餐欠费或未开通该能力，请联系管理员在腾讯云续费或升级套餐。'
}

/** 发起通话等失败时：套餐类错误用友好文案，否则返回原始信息 */
export function formatTUICallUserError(err: unknown, defaultMessage = '通话操作失败'): string {
  if (isTUICallPackageAbilityError(err)) return getTUICallPackageArrearsMessage()
  if (err instanceof Error) return err.message || defaultMessage
  if (typeof err === 'string') return err || defaultMessage
  return defaultMessage
}