// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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

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

/// The main app.
class App extends StatelessWidget {
  /// Creates an [App].
  App({Key? key}) : super(key: key);

  /// The title of the app.
  static const String title = 'GoRouter Example: Custom Error Screen';

  @override
  Widget build(BuildContext context) => MaterialApp.router(
        routeInformationProvider: _router.routeInformationProvider,
        routeInformationParser: _router.routeInformationParser,
        routerDelegate: _router.routerDelegate,
        title: title,
      );

  final GoRouter _router = GoRouter(
    routes: <GoRoute>[
      GoRoute(
        path: '/',
        builder: (BuildContext context, GoRouterState state) =>
            const Page1Screen(),
      ),
      GoRoute(
        path: '/page2',
        builder: (BuildContext context, GoRouterState state) =>
            const Page2Screen(),
      ),
    ],
    errorBuilder: (BuildContext context, GoRouterState state) =>
        ErrorScreen(state.error!),
  );
}

/// The screen of the first page.
class Page1Screen extends StatelessWidget {
  /// Creates a [Page1Screen].
  const Page1Screen({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) => Scaffold(
        appBar: AppBar(title: const Text(App.title)),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              ElevatedButton(
                onPressed: () => context.go('/page2'),
                child: const Text('Go to page 2'),
              ),
            ],
          ),
        ),
      );
}

/// The screen of the second page.
class Page2Screen extends StatelessWidget {
  /// Creates a [Page2Screen].
  const Page2Screen({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) => Scaffold(
        appBar: AppBar(title: const Text(App.title)),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              ElevatedButton(
                onPressed: () => context.go('/'),
                child: const Text('Go to home page'),
              ),
            ],
          ),
        ),
      );
}

/// The screen of the error page.
class ErrorScreen extends StatelessWidget {
  /// Creates an [ErrorScreen].
  const ErrorScreen(this.error, {Key? key}) : super(key: key);

  /// The error to display.
  final Exception error;

  @override
  Widget build(BuildContext context) => Scaffold(
        appBar: AppBar(title: const Text('My "Page Not Found" Screen')),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              SelectableText(error.toString()),
              TextButton(
                onPressed: () => context.go('/'),
                child: const Text('Home'),
              ),
            ],
          ),
        ),
      );
}