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

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

GoRouter _router = GoRouter(
  initialLocation: '/splash',
  debugLogDiagnostics: true,
  observers: [],
  routes: [
    GoRoute(
      path: '/splash',
      pageBuilder: (context, state) => CustomTransitionPage<void>(
        key: state.pageKey,
        child: const SplashPage(),
        transitionsBuilder: (context, animation, animation2, child) {
          return FadeTransition(
            opacity: animation,
            child: child,
          );
        },
      ),
    ),
    GoRoute(
      name: 'login',
      path: '/login',
      builder: (context, state) => LoginPage(user: state.extra! as String),
    ),
  ],
);

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp.router(
      routeInformationParser: _router.routeInformationParser,
      routerDelegate: _router.routerDelegate,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
    );
  }
}

class SplashPage extends StatefulWidget {
  const SplashPage({Key? key}) : super(key: key);

  @override
  State<SplashPage> createState() => _SplashPageState();
}

class _SplashPageState extends State<SplashPage> {
  Future<void> _checkSplash() async {
    await Future.delayed(const Duration(seconds: 2));
    context.go('/login', extra: "Diego");
  }

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      backgroundColor: Colors.white,
      body: const Center(
        child: CircularProgressIndicator(),
      ),
    );
  }
}

class LoginPage extends StatefulWidget {
  const LoginPage({required this.user, Key? key}) : super(key: key);
  final String user;

  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('LOGIN'),
      ),
      body: Center(
        child: Text('user: ${widget.user}'),
      ),
    );
  }
}