import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';

class LocaleProvider with ChangeNotifier {
  static const _localeKey = 'locale_code';

  Locale _locale = const Locale('en');

  Locale get locale => _locale;

  LocaleProvider() {
    _loadLocale();
  }

  Future<void> _loadLocale() async {
    final prefs = await SharedPreferences.getInstance();
    final code = prefs.getString(_localeKey);
    if (code != null && L10n.all.contains(Locale(code))) {
      _locale = Locale(code);
      notifyListeners();
    }
  }

  void setLocale(Locale locale) async {
    if (!L10n.all.contains(locale)) return;

    _locale = locale;
    notifyListeners();

    final prefs = await SharedPreferences.getInstance();
    await prefs.setString(_localeKey, locale.languageCode);
  }
}

class L10n {
  static final all = [
    const Locale('en'),
    const Locale('fr'),
    const Locale('de')
  ];
}