// Supported locales for the app. fa-IR is the default (Persian, RTL); en-US is
// the secondary (English, LTR). Routing is path-prefixed: /fa-IR/... , /en-US/...
export const locales = ['fa-IR', 'en-US'] as const;

export type Locale = (typeof locales)[number];

export const defaultLocale: Locale = 'fa-IR';

export const localeDirection: Record<Locale, 'rtl' | 'ltr'> = {
  'fa-IR': 'rtl',
  'en-US': 'ltr',
};

// Short, human-facing labels for the language switcher.
export const localeNames: Record<Locale, string> = {
  'fa-IR': 'فارسی',
  'en-US': 'English',
};

export const LOCALE_COOKIE = 'NEXT_LOCALE';

export function isLocale(value: string | undefined | null): value is Locale {
  return !!value && (locales as readonly string[]).includes(value);
}

export function dirFor(locale: Locale): 'rtl' | 'ltr' {
  return localeDirection[locale];
}