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

import 'config.dart';
import 'models/sale.dart';
import 'state/app_state.dart';
import 'services/printer_service.dart';
import 'screens/login_screen.dart';
import 'screens/home_page.dart';
import 'utils/colors.dart';
import 'utils/format.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Supabase.initialize(url: supabaseUrl, publishableKey: supabaseAnonKey);
  await printerService.init();
  runApp(const MyApp());
}

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

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
  late final AppState _appState;
  final GlobalKey<ScaffoldMessengerState> _scaffoldKey =
      GlobalKey<ScaffoldMessengerState>();

  @override
  void initState() {
    super.initState();
    _appState = AppState();
    WidgetsBinding.instance.addObserver(this);
    // Dengarkan stream notifikasi transaksi baru (dari HP lain / checkout).
    _appState.newSaleNotifications.stream.listen(_showSaleNotification);
  }

  void _showSaleNotification(Sale sale) {
    final messenger = _scaffoldKey.currentState;
    if (messenger == null) return;
    // Getar + bunyi notifikasi.
    HapticFeedback.heavyImpact();
    SystemSound.play(SystemSoundType.click);
    // Banner notifikasi di atas layar.
    messenger.showSnackBar(
      SnackBar(
        content: Row(
          children: [
            const Icon(Icons.check_circle, color: kSuccess, size: 20),
            const SizedBox(width: 10),
            Expanded(
              child: Text(
                'Transaksi baru: ${sale.items.fold<int>(0, (s, i) => s + i.qty)} item • ${formatRupiah(sale.total)}',
                style: const TextStyle(color: kText, fontWeight: FontWeight.w600),
              ),
            ),
          ],
        ),
        backgroundColor: kSurface,
        behavior: SnackBarBehavior.floating,
        duration: const Duration(seconds: 4),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(14),
          side: const BorderSide(color: kSuccess, width: 1),
        ),
      ),
    );
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    _appState.stopPolling();
    super.dispose();
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.resumed) {
      _appState.startPolling();
    } else {
      _appState.stopPolling();
    }
  }

  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider.value(
      value: _appState,
      child: MaterialApp(
        scaffoldMessengerKey: _scaffoldKey,
        title: 'Dutra Store',
        debugShowCheckedModeBanner: false,
        theme: ThemeData(
          useMaterial3: true,
          brightness: Brightness.dark,
          scaffoldBackgroundColor: kBackground,
          colorScheme: ColorScheme.dark(
            primary: kAccent,
            secondary: kSuccess,
            surface: kSurface,
            onSurface: kText,
            error: kDanger,
          ),
          appBarTheme: const AppBarTheme(
            backgroundColor: kBackground,
            foregroundColor: kText,
            elevation: 0,
            centerTitle: true,
            titleTextStyle: TextStyle(
              fontSize: 20,
              fontWeight: FontWeight.w700,
              color: kText,
            ),
          ),
          cardTheme: CardThemeData(
            color: kSurface2,
            elevation: 0,
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(kRadius),
              side: const BorderSide(color: kBorder),
            ),
          ),
          inputDecorationTheme: InputDecorationTheme(
            filled: true,
            fillColor: kSurface2,
            contentPadding:
                const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
            border: OutlineInputBorder(
              borderRadius: BorderRadius.circular(14),
              borderSide: BorderSide.none,
            ),
            enabledBorder: OutlineInputBorder(
              borderRadius: BorderRadius.circular(14),
              borderSide: const BorderSide(color: kBorder),
            ),
            focusedBorder: OutlineInputBorder(
              borderRadius: BorderRadius.circular(14),
              borderSide: const BorderSide(color: kAccent, width: 1.5),
            ),
            labelStyle: const TextStyle(color: kMuted),
            hintStyle: const TextStyle(color: kMuted),
          ),
          filledButtonTheme: FilledButtonThemeData(
            style: FilledButton.styleFrom(
              backgroundColor: kAccent,
              foregroundColor: const Color(0xFF1A1206),
              padding: const EdgeInsets.symmetric(vertical: 16),
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(14),
              ),
              textStyle: const TextStyle(
                fontSize: 16,
                fontWeight: FontWeight.w700,
              ),
            ),
          ),
          dialogTheme: DialogThemeData(
            backgroundColor: kSurface,
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(20),
            ),
            titleTextStyle: const TextStyle(
              fontSize: 18,
              fontWeight: FontWeight.w700,
              color: kText,
            ),
          ),
          bottomNavigationBarTheme: const BottomNavigationBarThemeData(
            backgroundColor: kSurface,
            selectedItemColor: kAccent,
            unselectedItemColor: kMuted,
            selectedLabelStyle: TextStyle(fontWeight: FontWeight.w600),
            type: BottomNavigationBarType.fixed,
            elevation: 0,
          ),
        ),
        home: const AuthGate(),
      ),
    );
  }
}

class AuthGate extends StatelessWidget {
  const AuthGate({super.key});

  @override
  Widget build(BuildContext context) {
    return Selector<AppState, ({bool loading, bool loggedIn, bool expired})>(
      selector: (context, state) => (
        loading: state.loading,
        loggedIn: state.isLoggedIn,
        expired: state.sessionExpired,
      ),
      builder: (context, a, child) {
        // Loading global hanya untuk init aplikasi. Proses login dihandle
        // tombol LoginScreen, status data produk dihandle spinner khusus
        // Kasir agar layar tidak melepas LoginScreen saat gagal login.
        if (a.loading) {
          return const Scaffold(
            body: Center(child: CircularProgressIndicator(color: kAccent)),
          );
        }
        if (a.loggedIn && !a.expired) {
          return const HomePage();
        }
        return const LoginScreen();
      },
    );
  }
}