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

import 'firebase_options.dart';

Future 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(
      title: 'Firebase Auth App',
      theme: ThemeData.light().copyWith(
          colorScheme: ColorScheme.fromSwatch(primarySwatch: Colors.purple)
              .copyWith(secondary: Colors.purple)),
      home: BlocProvider<AuthBloc>(
        create: (context) => AuthBloc(),
        child: LoginScreen(),
      ),
    );
  }
}

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

//   @override
//   Widget build(BuildContext context) => Scaffold(
//         body: StreamBuilder<User?>(
//           stream: FirebaseAuth.instance.authStateChanges(),
//           builder: (context, snapshot) {
//             if (snapshot.connectionState == ConnectionState.waiting) {
//               return const Center(child: CircularProgressIndicator());
//             } else if (snapshot.hasError) {
//               return const Center(child: Text('Algo deu errado :('));
//             } else if (snapshot.hasData) {
//               return const HomePage();
//             } else {
//               return const AuthPage();
//             }
//           },
//         ),
//       );
// }

class LoginScreen extends StatelessWidget {
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();

  LoginScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return BlocBuilder<AuthBloc, AuthState>(
      builder: (context, state) {
      if (state is AuthenticatedState) {
        return Column(
          children: <Widget>[
            Text('Welcome, ${state.user?.displayName}'),
            Text('Your email is ${state.user?.email}'),
          ],
        );
      } else {
        return Scaffold(
          body: Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                TextField(
                  controller: _emailController,
                  decoration: const InputDecoration(
                    hintText: 'Enter your email',
                  ),
                ),
                TextField(
                  controller: _passwordController,
                  decoration: const InputDecoration(
                    hintText: 'Enter your password',
                  ),
                ),
                ElevatedButton(
                  onPressed: () {
                    BlocProvider.of<AuthBloc>(context).add(
                      LoginEvent(
                        email: _emailController.text,
                        password: _passwordController.text,
                      ),
                    );
                  },
                  child: const Text('Login'),
                ),
              ],
            ),
          ),
        );
      }
    }
    );
  }
}

class AuthBloc extends Bloc<LoginEvent, AuthState> {
  final _firebaseAuth = FirebaseAuth.instance;

  AuthBloc() : super(InitialAuthState());

  // AuthState get initialState => InitialAuthState();

  Stream<AuthState> mapEventToState(LoginEvent event) async* {
    try {
      await _firebaseAuth.signInWithEmailAndPassword(
        email: event.email,
        password: event.password,
      );
      yield AuthenticatedState();
    } catch (error) {
      yield AuthenticationErrorState(error: error.toString());
    }
  }
}

abstract class AuthState {}

class InitialAuthState extends AuthState {}

class AuthenticatedState extends AuthState {
  final User? user;

  AuthenticatedState({this.user});
}

class AuthenticationErrorState extends AuthState {
  final String error;

  AuthenticationErrorState({required this.error});
}

class LoginEvent {
  final String email;
  final String password;

  LoginEvent({required this.email, required this.password});
}