/**
 * Извлекает гео-данные и клиентские параметры из заголовков запроса.
 * Поддерживает заголовки Cloudflare (cf-ipcountry, cf-region) и кастомные (x-country-code, x-region-code).
 */
export function getClientHeaders(event: any) {
  const headers = event.node.req.headers;

  const countryCode =
    (headers['cf-ipcountry'] as string) ||
    (headers['x-country-code'] as string) ||
    (headers['x-country'] as string) ||
    (Array.isArray(headers['x-country-code']) ? headers['x-country-code'][0] : undefined);

  const stateCode =
    (headers['x-region-code'] as string) ||
    (headers['cf-region'] as string) ||
    (Array.isArray(headers['x-region-code']) ? headers['x-region-code'][0] : undefined);

  const remoteIP = headers['x-real-ip'] as string | undefined;
  const userAgent = headers['user-agent'] as string | undefined;

  return {
    countryCode: countryCode?.trim().toUpperCase(),
    stateCode: stateCode?.trim().toUpperCase(),
    remoteIP: remoteIP?.trim(),
    userAgent: userAgent?.trim(),
    headers,
  };
}