// Copyright 2014 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';

/// Flutter code sample for [BottomNavigationBar].

void main() => runApp(const BottomNavigationBarExampleApp());

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(home: BottomNavigationBarExample());
  }
}

class BottomNavigationBarExample extends StatefulWidget {
  const BottomNavigationBarExample({super.key});

  @override
  State<BottomNavigationBarExample> createState() =>
      _BottomNavigationBarExampleState();
}

class _BottomNavigationBarExampleState
    extends State<BottomNavigationBarExample> {
  int _selectedIndex = 0;
  static const TextStyle optionStyle = TextStyle(
    fontSize: 30,
    fontWeight: FontWeight.bold,
  );
  static const List<Widget> _widgetOptions = <Widget>[
    Text('Index 0: Home', style: optionStyle),
    Text('Index 1: Business', style: optionStyle),
    Text('Index 2: School', style: optionStyle),
    Text('Index 3: Settings', style: optionStyle),
  ];

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('BottomNavigationBar Sample')),
      body: Center(child: _widgetOptions.elementAt(_selectedIndex)),
      bottomNavigationBar: BottomNavigationBar(
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Home',
            backgroundColor: Colors.red,
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.business),
            label: 'Business',
            backgroundColor: Colors.green,
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.school),
            label: 'School',
            backgroundColor: Colors.purple,
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.settings),
            label: 'Settings',
            backgroundColor: Colors.pink,
          ),
        ],
        currentIndex: _selectedIndex,
        selectedItemColor: Colors.amber[800],
        onTap: _onItemTapped,
      ),
    );
  }
}