adventofcode2025/lib/main.dart

// ignore_for_file: prefer_const_constructors, prefer_const_literals_to_create_immutables

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'days_enum.dart';
import 'day_page.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider(
      create: (context) => MyAppState(),
      child: MaterialApp(
        title: 'Advent of Code 2025',
        theme: ThemeData(
          useMaterial3: true,
          colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepOrange),
        ),
        home: MyHomePage(),
      ),
    );
  }
}

class MyAppState extends ChangeNotifier {
}

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

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

class _MyHomePageState extends State<MyHomePage> {
  var selectedIndex = 0;

  @override
  Widget build(BuildContext context) {
    // Manage days and create items list of a pages.
    final days = [AdventOfCodeDays.day1, AdventOfCodeDays.day2];
    List<NavigationRailDestination> dayItems = [];
    for (var day in days) {
      dayItems.add(
        NavigationRailDestination(
          icon: Icon(Icons.arrow_forward_ios),
          label: Text(day.title),
        ),
      );
    }
    var colorScheme = Theme.of(context).colorScheme;

    Widget page = DayPage();

    // The container for the current page, with its background color
    // and subtle switching animation.
    var mainArea = ColoredBox(
      color: colorScheme.surfaceContainerHighest,
      child: AnimatedSwitcher(
        duration: Duration(milliseconds: 200),
        child: page,
      ),
    );

    return Scaffold(
      body: LayoutBuilder(
        builder: (context, constraints) {
          return Row(
            children: [
              SafeArea(
                child: NavigationRail(
                  extended: constraints.maxWidth >= 600,
                  destinations: dayItems,
                  selectedIndex: selectedIndex,
                  onDestinationSelected: (value) {
                    setState(() {
                      selectedIndex = value;
                    });
                  },
                ),
              ),
              Expanded(child: mainArea),
            ],
          );
        },
      ),
    );
  }
}