import { t } from '#/locales/t';

/** Convert API errors to text without rendering objects or echoing request inputs. */
function errorText(value: unknown, depth = 0): string {
  // Backend messages are shown as-is; t() only swaps in an English text when the dictionary has one.
  if (typeof value === 'string') return t(value.trim());
  if (!value || typeof value !== 'object' || depth > 3) return '';
  if (Array.isArray(value)) {
    return [...new Set(value.slice(0, 3).map((entry) => errorText(entry, depth + 1)).filter(Boolean))].join(t('；'));
  }
  const detail = value as Record<string, unknown>;
  if (Array.isArray(detail.loc) && typeof detail.type === 'string') {
    const field = detail.loc.at(-1) === 'query' ? t('检索问题') : t('请求参数');
    const ctx = detail.ctx as Record<string, unknown> | undefined;
    if (detail.type === 'string_too_short' && typeof ctx?.min_length === 'number') return t('{field}至少需要 {min} 个字符', { field, min: ctx.min_length });
    if (detail.type === 'string_too_long' && typeof ctx?.max_length === 'number') return t('{field}不能超过 {max} 个字符', { field, max: ctx.max_length });
    if (detail.type === 'missing') return t('请填写{field}', { field });
    if (detail.type === 'string_type') return t('{field}必须是文本', { field });
    return typeof detail.msg === 'string' ? t('{field}：{msg}', { field, msg: detail.msg }) : t('{field}格式不正确', { field });
  }
  for (const key of ['detail', 'error', 'message', 'msg']) {
    const text = errorText(detail[key], depth + 1);
    if (text) return text;
  }
  return '';
}

export function responseErrorMessage(data: unknown, fallback = t('请求失败，请稍后重试')): string {
  return errorText(data) || fallback;
}

export function requestErrorMessage(error: unknown, fallback = t('请求失败，请稍后重试')): string {
  const data = (error as { response?: { data?: unknown } } | null)?.response?.data;
  // RequestClient unwraps Axios response.data before rejecting to page handlers.
  return responseErrorMessage(data ?? (error instanceof Error ? undefined : error), fallback);
}