import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  final _routerDelegate = MyRouterDelegate();
  final _routeParser = MyRouteInformationParser();

  @override
  Widget build(BuildContext context) {
    return MaterialApp.router(
      routerDelegate: _routerDelegate,
      routeInformationParser: _routeParser,
    );
  }
}

class MyRoutePath {
  final bool isDetails;
  MyRoutePath.home() : isDetails = false;
  MyRoutePath.details() : isDetails = true;
}

class MyRouteInformationParser extends RouteInformationParser<MyRoutePath> {
  @override
  Future<MyRoutePath> parseRouteInformation(
      RouteInformation info) async {
    final uri = Uri.parse(info.location ?? '');
    if (uri.pathSegments.contains('details')) {
      return MyRoutePath.details();
    }
    return MyRoutePath.home();
  }

  @override
  RouteInformation restoreRouteInformation(MyRoutePath path) {
    return RouteInformation(
      location: path.isDetails ? '/details' : '/',
    );
  }
}

class MyRouterDelegate extends RouterDelegate<MyRoutePath>
    with ChangeNotifier, PopNavigatorRouterDelegateMixin<MyRoutePath> {
  final GlobalKey<NavigatorState> navigatorKey;
  bool showDetails = false;

  MyRouterDelegate() : navigatorKey = GlobalKey<NavigatorState>();

  @override
  MyRoutePath get currentConfiguration {
    return showDetails ? MyRoutePath.details() : MyRoutePath.home();
  }

  void _handleTap() {
    showDetails = true;
    notifyListeners();
  }

  @override
  Widget build(BuildContext context) {
    return Navigator(
      key: navigatorKey,
      pages: [
        MaterialPage(key: ValueKey('HomePage'), child: HomeScreen(onTap: _handleTap)),
        if (showDetails)
          MaterialPage(key: ValueKey('DetailsPage'), child: DetailsScreen()),
      ],
      onPopPage: (route, result) {
        if (!route.didPop(result)) return false;
        showDetails = false;
        notifyListeners();
        return true;
      },
    );
  }

  @override
  Future<void> setNewRoutePath(MyRoutePath path) async {
    showDetails = path.isDetails;
  }
}

class HomeScreen extends StatelessWidget {
  final VoidCallback onTap;
  HomeScreen({required this.onTap});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Home')),
      body: Center(
        child: ElevatedButton(
          onPressed: onTap,
          child: Text('Go to Details'),
        ),
      ),
    );
  }
}

class DetailsScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Details')),
      body: Center(child: Text('Detail View')),
    );
  }
}

bool loggedIn = false;

List<Page> buildPages() {
  final pages = <Page>[];
  if (!loggedIn) {
    pages.add(MaterialPage(child: LoginScreen(onLogin: () {
      loggedIn = true;
      notifyListeners();
    })));
  }
  if (loggedIn) {
    pages.add(MaterialPage(child: HomeScreen(onTap: showDetails)));
    if (showDetails) {
      pages.add(MaterialPage(child