import { recomaze_ai_personalization_env } from '../env';

/** Languages the agent backend can generate content in. */
export const SUPPORTED_LANGUAGES = [
  'en',
  'ro',
  'zh',
  'es',
  'hi',
  'bn',
  'pt',
  'ru',
  'ja',
  'pa',
  'mr',
  'te',
  'tr',
  'ko',
  'fr',
  'vi',
  'de',
  'ar',
  'ur',
  'id',
  'gu',
  'pl',
  'uk',
  'fa',
  'ml',
  'kn',
  'he',
  'it',
  'el',
] as const;

export type SupportedLanguage = (typeof SUPPORTED_LANGUAGES)[number];

/**
 * Resolves the store language, falling back to the WordPress locale and then
 * to English. Region suffixes are dropped (``en-GB`` becomes ``en``).
 *
 * @param {string | string[] | null | undefined} language - Raw language value
 * @returns {SupportedLanguage} A language the backend supports
 */
export const getStoreLanguage = (
  language?: string | string[] | null
): SupportedLanguage => {
  const raw =
    (Array.isArray(language) ? language[0] : language) ||
    recomaze_ai_personalization_env?.lang ||
    'en';
  const base = raw.split('-')[0]?.toLowerCase() || 'en';

  return SUPPORTED_LANGUAGES.includes(base as SupportedLanguage)
    ? (base as SupportedLanguage)
    : 'en';
};