/// ISO 639-1 codes offered in Settings for stream language filtering.
///
/// Stored lowercase (Helix). GQL `Language` enums are the uppercase form.
class StreamLanguages {
  StreamLanguages._();

  static const all = <({String code, String label})>[
    (code: 'de', label: 'Deutsch'),
    (code: 'en', label: 'English'),
    (code: 'es', label: 'Español'),
    (code: 'fr', label: 'Français'),
    (code: 'it', label: 'Italiano'),
    (code: 'pt', label: 'Português'),
    (code: 'pl', label: 'Polski'),
    (code: 'ru', label: 'Русский'),
    (code: 'tr', label: 'Türkçe'),
    (code: 'nl', label: 'Nederlands'),
    (code: 'sv', label: 'Svenska'),
    (code: 'no', label: 'Norsk'),
    (code: 'da', label: 'Dansk'),
    (code: 'fi', label: 'Suomi'),
    (code: 'cs', label: 'Čeština'),
    (code: 'hu', label: 'Magyar'),
    (code: 'ro', label: 'Română'),
    (code: 'uk', label: 'Українська'),
    (code: 'ja', label: '日本語'),
    (code: 'ko', label: '한국어'),
    (code: 'zh', label: '中文'),
    (code: 'ar', label: 'العربية'),
    (code: 'th', label: 'ไทย'),
    (code: 'vi', label: 'Tiếng Việt'),
    (code: 'id', label: 'Bahasa Indonesia'),
    (code: 'hi', label: 'हिन्दी'),
    (code: 'other', label: 'Other'),
  ];

  static String labelFor(String code) {
    for (final entry in all) {
      if (entry.code == code) return entry.label;
    }
    return code;
  }

  /// Helix / settings codes → GQL `Language` enum values.
  static List<String> toGqlEnums(Iterable<String> codes) => codes
      .map((c) => c.trim().toLowerCase())
      .where((c) => c.isNotEmpty)
      .map((c) => c.toUpperCase())
      .toList();
}