import Settings from 'settings';

export default function getRootHostname(
  url: string | undefined
): string | null {
  if (!url) return null;

  try {
    const urlObj = new URL(url);
    const hostname = urlObj.hostname;
    const parts = hostname.split('.');

    const firstPart = parts[0];

    const isLocale = Settings.localization.locales.some(
      (locale) => locale.value === firstPart
    );

    if (isLocale) {
      const hostnameAfterLocale = parts.slice(1).join('.');
      return `.${hostnameAfterLocale}`;
    }

    return `.${hostname}`;
  } catch {
    return null;
  }
}