// Locale settings shared by the proxy, server components and client components.

export const locales = ["en", "es", "ar"] as const;
export type Locale = (typeof locales)[number];

/** English is served from the root (`/about`); the others carry a prefix (`/es/about`). */
export const defaultLocale: Locale = "en";

export const localeNames: Record<Locale, string> = { en: "English", es: "Español", ar: "العربية" };
export const localeShort: Record<Locale, string> = { en: "EN", es: "ES", ar: "AR" };
/** Open Graph locale tags. */
export const ogLocale: Record<Locale, string> = { en: "en_US", es: "es_ES", ar: "ar_AE" };

export const isLocale = (value: string | undefined): value is Locale =>
  (locales as readonly string[]).includes(value ?? "");

export const dirOf = (locale: Locale) => (locale === "ar" ? "rtl" : "ltr");

/** Prefix an internal path with the locale. Hashes and external URLs pass through untouched. */
export function localize(path: string, locale: Locale): string {
  if (locale === defaultLocale || !path.startsWith("/")) return path;
  return path === "/" ? `/${locale}` : `/${locale}${path}`;
}

/** Split a browser pathname into its locale and the locale-free path. */
export function splitLocale(pathname: string): { locale: Locale; path: string } {
  const first = pathname.split("/")[1];
  if (isLocale(first)) {
    return { locale: first, path: pathname.slice(first.length + 1) || "/" };
  }
  return { locale: defaultLocale, path: pathname };
}