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

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

final GoRouter goRouter = GoRouter(
  initialLocation: '/',
  routes: <RouteBase>[
    ShellRoute(
      builder: (BuildContext context, GoRouterState state, Widget child) {
        return Scaffold(
          body: SafeArea(
            child: Padding(
              padding: const EdgeInsets.symmetric(vertical: 8.0),
              child: child,
            ),
          ),
        );
      },
      routes: <RouteBase>[
        GoRoute(
          path: '/',
          name: 'home',
          builder: (context, state) => Container(
              child: TextButton(
            onPressed: () {
              context.push('/extra', extra: {'foo': 'bar'});
            },
            child: Text('Pass extra'),
          )),
        ),
        GoRoute(
            path: '/extra',
            name: 'extra route',
            builder: (context, state) {
              final Map<String, Object> extra = state.extra! as Map<String, String>;
              final String foo = extra["foo"]! as String;

              final Map<String, Object> globalExtra =
                  (goRouter.routerDelegate.currentConfiguration.extra as Map<String, String>?) ?? {};
              final String? globalFoo = globalExtra["foo"] as String?;

              return Container(
                child: Column(
                  children: [Text("Extra passed: $foo"), Text("Extra in configuration: $globalFoo")],
                ),
              );
            }),
      ],
    )
  ],
);

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

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp.router(
      title: 'Flutter Demo',
      routerConfig: goRouter,
      theme: ThemeData(
        // This is the theme of your application.
        //
        // TRY THIS: Try running your application with "flutter run". You'll see
        // the application has a purple toolbar. Then, without quitting the app,
        // try changing the seedColor in the colorScheme below to Colors.green
        // and then invoke "hot reload" (save your changes or press the "hot
        // reload" button in a Flutter-supported IDE, or press "r" if you used
        // the command line to start the app).
        //
        // Notice that the counter didn't reset back to zero; the application
        // state is not lost during the reload. To reset the state, use hot
        // restart instead.
        //
        // This works for code too, not just values: Most code changes can be
        // tested with just a hot reload.
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
    );
  }
}