import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_provider_example/provider.dart';
import 'package:provider/provider.dart';

void main() {
  final provders = [
    ChangeNotifierProvider(
      create: (context) => MyProvider(),
    ),
  ];

  runApp(MultiProvider(providers: provders, child: const MyApp()));
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Provider',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Provier Home Page'),
    );
  }
}

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

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

class _MyHomePageState extends State<MyHomePage> {
  MyProvider? _provider;
  int _counter = 0;

  @override
  void initState() {
    if (kDebugMode) {
      print('initState');
    }

    super.initState();

    // Load the provider
    _provider = Provider.of<MyProvider>(context, listen: false);
  }

  @override
  void didChangeDependencies() {
    if (kDebugMode) {
      print('didChangeDependencies');
    }
    super.didChangeDependencies();
  }

  @override
  Widget build(BuildContext context) {
    if (kDebugMode) {
      print("_MyHomePageState.build()");
    }

    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: ListView.builder(
          itemBuilder: (context, index) {
            final person = _provider!.people[index];
            return ListTile(
              title: Text('Name: ${person.name}'),
              subtitle: Text('Age: ${person.age}'),
            );
          },
          itemCount: _provider?.people.length ?? 0,
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          if (_counter % 2 == 0) {
            _provider!.addPerson(Person('World', 30));
          } else {
            _provider!.removeLastPerson();
          }
          setState(() {
            _counter++;
          });
        },
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}