export const SUPPORTED_LANGUAGES = [
  { value: 'de', label: 'Deutsch', locale: 'de-DE' },
  { value: 'en', label: 'English', locale: 'en-US' },
  { value: 'es', label: 'Español', locale: 'es-ES' },
  { value: 'fr', label: 'Français', locale: 'fr-FR' },
  { value: 'hu', label: 'Magyar', locale: 'hu-HU' },
  { value: 'nl', label: 'Nederlands', locale: 'nl-NL' },
  { value: 'br', label: 'Português (Brasil)', locale: 'pt-BR' },
  { value: 'cs', label: 'Česky', locale: 'cs-CZ' },
  { value: 'pl', label: 'Polski', locale: 'pl-PL' },
  { value: 'ru', label: 'Русский', locale: 'ru-RU' },
  { value: 'zh', label: '简体中文', locale: 'zh-CN' },
  { value: 'zh-TW', label: '繁體中文', locale: 'zh-TW' },
  { value: 'it', label: 'Italiano', locale: 'it-IT' },
  { value: 'tr', label: 'Türkçe', locale: 'tr-TR' },
  { value: 'ar', label: 'العربية', locale: 'ar-SA' },
  { value: 'id', label: 'Bahasa Indonesia', locale: 'id-ID' },
  { value: 'ja', label: '日本語', locale: 'ja-JP' },
  { value: 'ko', label: '한국어', locale: 'ko-KR' },
  { value: 'uk', label: 'Українська', locale: 'uk-UA' },
  { value: 'gr', label: 'Ελληνικά', locale: 'el-GR' },
] as const;

export type SupportedLanguageCode =
  (typeof SUPPORTED_LANGUAGES)[number]['value'];

export const SUPPORTED_LANGUAGE_CODES: string[] = SUPPORTED_LANGUAGES.map(
  (l) => l.value,
);

const LOCALES: Partial<Record<string, string>> = Object.fromEntries(
  SUPPORTED_LANGUAGES.map((l) => [l.value, l.locale]),
);

// Languages displayed right-to-left.
const RTL_LANGUAGES = new Set<string>(['ar']);

export function getLocaleForLanguage(language: string): string {
  return LOCALES[language] ?? LOCALES['en'] ?? 'en-US';
}

// Returns a BCP-47 tag suitable for Intl APIs.
export function getIntlLanguage(language: string): string {
  if (language === 'br') return 'pt-BR';
  return SUPPORTED_LANGUAGE_CODES.includes(language) ? language : 'en';
}

export function isRtlLanguage(language: string): boolean {
  return RTL_LANGUAGES.has(language);
}