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

/// Manages app locale with persistence
class LocaleProvider extends ChangeNotifier {
  static const String _localeKey = 'app_locale';
  
  Locale _locale = const Locale('en');
  
  Locale get locale => _locale;
  
  /// Supported locales
  static const List<Locale> supportedLocales = [
    Locale('en'), // English
    Locale('nl'), // Dutch
    Locale('ru'), // Russian
  ];
  
  /// Locale display names
  static const Map<String, String> localeNames = {
    'en': 'English',
    'nl': 'Nederlands',
    'ru': 'Русский',
  };
  
  /// Short codes for display in header
  static const Map<String, String> localeCodes = {
    'en': 'EN',
    'nl': 'NL',
    'ru': 'RU',
  };
  
  LocaleProvider() {
    _loadLocale();
  }
  
  /// Load saved locale from preferences
  Future<void> _loadLocale() async {
    try {
      final prefs = await SharedPreferences.getInstance();
      final localeCode = prefs.getString(_localeKey);
      if (localeCode != null && supportedLocales.any((l) => l.languageCode == localeCode)) {
        _locale = Locale(localeCode);
        notifyListeners();
      }
    } catch (e) {
      // Fallback to default if loading fails
      debugPrint('Failed to load locale: $e');
    }
  }
  
  /// Set and persist locale
  Future<void> setLocale(Locale locale) async {
    if (!supportedLocales.contains(locale)) return;
    
    _locale = locale;
    notifyListeners();
    
    try {
      final prefs = await SharedPreferences.getInstance();
      await prefs.setString(_localeKey, locale.languageCode);
    } catch (e) {
      debugPrint('Failed to save locale: $e');
    }
  }
  
  /// Get current locale name for display
  String get currentLocaleName => localeNames[_locale.languageCode] ?? 'English';
  
  /// Get current locale code for header display
  String get currentLocaleCode => localeCodes[_locale.languageCode] ?? 'EN';
}