import 'dart:convert';
import 'dart:io';

/// All 13 supported locale codes backing `lib/l10n/app_*.arb`.
///
/// `flutter test` always runs with the working directory set to the
/// package root, so `lib/l10n/...` below resolves correctly without any
/// extra path juggling.
const List<String> supportedArbLocales = [
  'ar',
  'bn',
  'de',
  'en',
  'es',
  'fr',
  'hi',
  'id',
  'it',
  'ja',
  'pt',
  'ru',
  'zh',
];

/// Reads and decodes `lib/l10n/app_<locale>.arb` as a JSON map.
Map<String, dynamic> readArb(String locale) {
  final file = File('lib/l10n/app_$locale.arb');
  return json.decode(file.readAsStringSync()) as Map<String, dynamic>;
}

/// Real translation keys only -- excludes ICU metadata entries (`@key`)
/// and the `@@locale` marker, which are not themselves translatable
/// strings.
Set<String> realKeys(Map<String, dynamic> arb) {
  return arb.keys.where((key) => !key.startsWith('@')).toSet();
}