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

import 'screens/conversation_list_screen.dart';
import 'screens/onboarding_tone_screen.dart';
import 'screens/signup_screen.dart';
import 'screens/splash_screen.dart';
import 'state/session_state.dart';
import 'theme/app_theme.dart';
import 'widgets/gradient_backdrop.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(const _Bootstrap());
}

/// Shows [SplashScreen] while [SessionState.restore] is in flight, then
/// swaps to the real app. Runs `runApp` immediately (rather than awaiting
/// restore() first) so the branded splash actually paints instead of
/// leaving a blank frame during the async gap.
class _Bootstrap extends StatefulWidget {
  const _Bootstrap();

  @override
  State<_Bootstrap> createState() => _BootstrapState();
}

class _BootstrapState extends State<_Bootstrap> {
  SessionState? _session;

  @override
  void initState() {
    super.initState();
    _init();
  }

  Future<void> _init() async {
    final session = SessionState();
    await session.restore();
    if (!mounted) return;
    setState(() => _session = session);
  }

  @override
  Widget build(BuildContext context) {
    final session = _session;
    if (session == null) {
      return MaterialApp(
        title: '와카뷰',
        debugShowCheckedModeBanner: false,
        theme: AppTheme.light(),
        darkTheme: AppTheme.dark(),
        themeMode: ThemeMode.system,
        builder: (context, child) => GradientBackdrop(child: child),
        home: const SplashScreen(),
      );
    }
    return YkavuApp(session: session);
  }
}

class YkavuApp extends StatelessWidget {
  const YkavuApp({super.key, required this.session});

  final SessionState session;

  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider.value(
      value: session,
      child: MaterialApp(
        title: '와카뷰',
        debugShowCheckedModeBanner: false,
        theme: AppTheme.light(),
        darkTheme: AppTheme.dark(),
        themeMode: ThemeMode.system,
        builder: (context, child) => GradientBackdrop(child: child),
        home: Consumer<SessionState>(
          builder: (context, s, _) {
            if (s.user == null) return const SignupScreen();
            if (!s.toneOnboardingDone) return const OnboardingToneScreen();
            return const ConversationListScreen();
          },
        ),
      ),
    );
  }
}