import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(useMaterial3: false),
      title: 'Flutter Demo',
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  int _selectedIndex = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  void _changeIndex(int index) {
    setState(() {
      _selectedIndex = index;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title, style: TextStyle(fontFamily: 'ProductSans')),
      ),
      body: Center(
        child: Column(
          children: [
            Text(
              'Button tapped $_counter time${_counter == 1 ? '' : 's'}.',
              // This optional key is used to uniquely identify this widget in
              // the integration test at: test_driver/tap_test.dart.
              key: Key('CountText'),
              style: TextStyle(fontSize: 24),
            ),
            MaterialButton(
              onPressed: () {
                print('Button tapped');
              },
              color: Colors.blue,
              child: Text('Test button 1'),
            ),
            MaterialButton(
              onPressed: () {
                print('Button tapped');
              },
              color: Colors.blue,
              child: Text('Test button 2'),
            ),
            MaterialButton(
              onPressed: () {
                print('Button tapped');
              },
              color: Colors.blue,
              child: Text('Test button 3'),
            ),
          ],
        ),
      ),
      bottomNavigationBar: NavigationBar(
        onDestinationSelected: (index) {
          print('Selected destination $index');
          _incrementCounter();
          _changeIndex(index);
        },
        selectedIndex: _selectedIndex,
        destinations: [
          NavigationDestination(label: 'one', icon: Icon(Icons.home)),
          NavigationDestination(label: 'two', icon: Icon(Icons.home)),
          NavigationDestination(label: 'three', icon: Icon(Icons.home)),
        ],
      ),
    );
  }
}