team-2/CHALLENGE_2/sleepysound/lib/main.dart

import 'package:flutter/material.dart';
import 'pages/now_playing_page.dart';
import 'pages/library_page.dart';
import 'pages/settings_page.dart';

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

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

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'SleepySound',
      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),
      ),
      home: const MyHomePage(title: 'Now Playing'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});
  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

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

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

  Widget _getSelectedPage() {
    switch (_selectedIndex) {
      case 0:
        return const NowPlayingPage();
      case 1:
        return const LibraryPage();
      case 2:
        return const SettingsPage();
      default:
        return const NowPlayingPage();
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(_getPageTitle()),
      ),
      body: _getSelectedPage(),
      bottomNavigationBar: BottomNavigationBar(
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(Icons.play_circle_filled),
            label: 'Now Playing',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.library_music),
            label: 'Library',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.settings),
            label: 'Settings',
          ),
        ],
        currentIndex: _selectedIndex,
        selectedItemColor: Colors.deepPurple,
        onTap: _onItemTapped,
      ),
    );
  }

  String _getPageTitle() {
    switch (_selectedIndex) {
      case 0:
        return 'Now Playing';
      case 1:
        return 'Library';
      case 2:
        return 'Settings';
      default:
        return 'Now Playing';
    }
  }
}