import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'firebase_options.dart';

import 'screen/welcom.dart';
import 'screen/login.dart';
import 'screen/register.dart';
import 'screen/dasboart.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();

  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );

  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Fermentasi Tempe IoT',

      theme: ThemeData(
        useMaterial3: true,
        colorSchemeSeed: const Color(0xFF4DB6AC),
        scaffoldBackgroundColor: const Color(0xFFF2F6F6),
        appBarTheme: const AppBarTheme(
          centerTitle: true,
          elevation: 0,
        ),
      ),

      // 🔥 INI PENTING
      initialRoute: '/',

      routes: {
        '/': (context) => const AuthGate(),
        '/welcome': (context) => const WelcomePage(),
        '/login': (context) => const LoginPage(),
        '/register': (context) => const RegisterPage(),
        '/dashboard': (context) => const DashboardPage(),
      },
    );
  }
}

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

  @override
  Widget build(BuildContext context) {

    return StreamBuilder<User?>(
      stream: FirebaseAuth.instance.authStateChanges(),

      builder: (context, snapshot) {

        // LOADING
        if (snapshot.connectionState == ConnectionState.waiting) {
          return const Scaffold(
            body: Center(child: CircularProgressIndicator()),
          );
        }

        // SUDAH LOGIN
        if (snapshot.data != null) {
          return const DashboardPage();
        }

        // BELUM LOGIN
        return const WelcomePage();
      },
    );
  }
}