type LocalePrefix = 'as-needed' | 'always' | 'never';

type RoutingBaseConfig = {
  /** A list of all locales that are supported. */
  locales: Array<string>;

  /* Used by default if none of the defined locales match. */
  defaultLocale: string;

  /** The default locale can be used without a prefix (e.g. `/about`). If you prefer to have a prefix for the default locale as well (e.g. `/en/about`), you can switch this option to `always`.
   */
  localePrefix?: LocalePrefix;
};

export type DomainConfig = Omit<
  RoutingBaseConfig,
  'locales' | 'localePrefix'
> & {
  /** The domain name (e.g. "example.com", "www.example.com" or "fr.example.com"). Note that the `x-forwarded-host` or alternatively the `host` header will be used to determine the requested domain. */
  domain: string;
  // Optional here
  locales?: RoutingBaseConfig['locales'];
};

type MiddlewareConfig = RoutingBaseConfig & {
  /** Can be used to change the locale handling per domain. */
  domains?: Array<DomainConfig>;

  /** By setting this to `false`, the `accept-language` header will no longer be used for locale detection. */
  localeDetection?: boolean;

  /** Sets the `Link` response header to notify search engines about content in other languages (defaults to `true`). See https://developers.google.com/search/docs/specialty/international/localized-versions#http */
  alternateLinks?: boolean;
};

export type MiddlewareConfigWithDefaults = MiddlewareConfig & {
  alternateLinks: boolean;
  localePrefix: LocalePrefix;
  localeDetection: boolean;
};

export default MiddlewareConfig;