/* Translation lookup and locale-aware formatting. Copy lives in /locales/*.json. */
(() => {
  const dictionaries = window.LifeOSLocales || {};
  const supported = ['en', 'zh-CN', 'zh-HK', 'zh-MO', 'zh-TW', 'ar', 'fr', 'ru', 'es', 'ja'];
  const names = { en: 'English', 'zh-CN': '简体中文', 'zh-HK': '繁體中文（香港）', 'zh-MO': '繁體中文（澳門）', 'zh-TW': '繁體中文（臺灣）', ar: 'العربية', fr: 'Français', ru: 'Русский', es: 'Español', ja: '日本語' };
  const PREFERENCE_KEY = 'lifeos_language_preference_v1';
  const normalize = value => {
    const code = String(value || '').replace(/_/g, '-').toLowerCase();
    if (code === 'zh' || code.startsWith('zh-hans') || code.startsWith('zh-cn') || code.startsWith('zh-sg')) return 'zh-CN';
    if (code.startsWith('zh-hk') || code.startsWith('zh-hant-hk')) return 'zh-HK';
    if (code.startsWith('zh-mo') || code.startsWith('zh-hant-mo')) return 'zh-MO';
    if (code.startsWith('zh-tw') || code.startsWith('zh-hant')) return 'zh-TW';
    return supported.find(item => item === code || code.startsWith(item + '-')) || null;
  };
  const validPreference = value => value === 'auto' || Boolean(normalize(value));
  const lookup = (object, path) => path.split('.').reduce((value, part) => value?.[part], object);
  const detectBrowserLanguage = () => {
    const preferences = navigator.languages?.length ? navigator.languages : [navigator.language || navigator.userLanguage || 'en'];
    return preferences.map(normalize).find(Boolean) || 'en';
  };
  const readPreference = () => {
    try {
      const saved = localStorage.getItem(PREFERENCE_KEY);
      if (validPreference(saved)) return saved === 'auto' ? 'auto' : normalize(saved);
      let oldSettings = {};
      try { oldSettings = JSON.parse(localStorage.getItem('lifeos_settings') || '{}'); } catch {}
      const legacyMode = oldSettings.languageMode ?? (['en', 'zh'].includes(oldSettings.language) ? 'manual' : 'auto');
      const migrated = legacyMode === 'manual' && normalize(oldSettings.language) ? normalize(oldSettings.language) : 'auto';
      localStorage.setItem(PREFERENCE_KEY, migrated);
      return migrated;
    } catch { return 'auto'; }
  };
  let preference = readPreference();
  const language = () => preference === 'auto' ? detectBrowserLanguage() : preference;
  function t(key, values = {}) {
    const template = lookup(dictionaries[language()], key) ?? lookup(dictionaries.en, key) ?? key;
    return String(template).replace(/\{(\w+)\}/g, (_, name) => values[name] ?? `{${name}}`);
  }
  const locale = () => language() === 'en' ? 'en-US' : language();
  function date(value, options) {
    const parsed = value instanceof Date ? value : new Date(typeof value === 'string' && /^\d{4}-\d{2}-\d{2}$/.test(value) ? `${value}T12:00:00` : value);
    return new Intl.DateTimeFormat(locale(), options).format(parsed);
  }
  const number = (value, options) => new Intl.NumberFormat(locale(), options).format(value);
  function setLanguage(value) {
    if (!validPreference(value)) return;
    preference = value === 'auto' ? 'auto' : normalize(value);
    try { localStorage.setItem(PREFERENCE_KEY, preference); } catch {}
    window.renderIcons?.();
    window.renderAll?.();
    window.applyLanguage?.();
    window.toast?.(preference === 'auto' ? t('feedback.followingBrowser', { name: names[language()] }) : t('feedback.languageSelected', { name: names[language()] }));
  }
  window.lang = language;
  window.setLanguage = setLanguage;
  window.LifeI18n = { t, date, number, locale, language, preference: () => preference, browserLanguage: detectBrowserLanguage, names, supported, dictionaries: { ...dictionaries, zh: dictionaries['zh-CN'] } };
})();