import 'package:flutter/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';
import 'package:inou_app/design/inou_theme.dart';
import 'package:inou_app/core/router.dart';
import 'package:inou_app/core/locale_provider.dart';

void main() {
  runApp(const InouApp());
}

/// Global locale notifier - accessible throughout the app
final localeNotifier = ValueNotifier<Locale>(const Locale('en'));

class InouApp extends StatefulWidget {
  const InouApp({super.key});

  @override
  State<InouApp> createState() => _InouAppState();

  /// Static method to change locale from anywhere
  static void setLocale(BuildContext context, Locale locale) {
    localeNotifier.value = locale;
    // Also persist to SharedPreferences
    LocaleProvider().setLocale(locale);
  }
  
  /// Get current locale
  static Locale getLocale(BuildContext context) {
    return localeNotifier.value;
  }
}

class _InouAppState extends State<InouApp> {
  late LocaleProvider _localeProvider;

  @override
  void initState() {
    super.initState();
    _localeProvider = LocaleProvider();
    _localeProvider.addListener(_onLocaleChanged);
    // Initialize with saved locale
    _loadSavedLocale();
  }
  
  Future<void> _loadSavedLocale() async {
    // Wait for provider to load saved locale
    await Future.delayed(const Duration(milliseconds: 100));
    if (mounted) {
      localeNotifier.value = _localeProvider.locale;
    }
  }
  
  void _onLocaleChanged() {
    if (mounted) {
      localeNotifier.value = _localeProvider.locale;
    }
  }
  
  @override
  void dispose() {
    _localeProvider.removeListener(_onLocaleChanged);
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return ValueListenableBuilder<Locale>(
      valueListenable: localeNotifier,
      builder: (context, locale, _) {
        return MaterialApp.router(
          title: 'inou',
          debugShowCheckedModeBanner: false,
          theme: InouTheme.light,
          routerConfig: appRouter,
          
          // Localization setup
          locale: locale,
          localizationsDelegates: const [
            AppLocalizations.delegate,
            GlobalMaterialLocalizations.delegate,
            GlobalWidgetsLocalizations.delegate,
            GlobalCupertinoLocalizations.delegate,
          ],
          supportedLocales: LocaleProvider.supportedLocales,
        );
      },
    );
  }
}