main.dart

import 'dart:convert';

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

import 'highscore.dart';

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

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

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

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

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  List highScores = [];

  Future<void> _incrementCounter() async {
    HighScore(username: "User", difficulty: 0, score: 100).save();
    HighScore(username: "User", difficulty: 1, score: 250).save();
    HighScore(username: "User", difficulty: 3, score: 1000).save();

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

  getScores() async {
    var prefs = await SharedPreferences.getInstance();
    String? source = prefs.getString('highscores');
    var maps = source != null ? jsonDecode(source) : [];
    setState(() {
      highScores = maps.map((e) => HighScore.fromMap(e)).toList();
    });
  }

  @override
  Widget build(BuildContext context) {
    getScores();
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
            for (var highScore in highScores)
              Text(
                  "Difficulty: ${highScore.difficulty.toString()}, score: ${highScore.score.toString()}")
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}