Scaffold out initial state management

lib/day_page.dart

@@ -1,42 +1,63 @@
+import "util.dart";
+import 'package:adventofcode2025/main.dart';
 import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import "days_enum.dart";
 
-Future<void> selectFile() async {
-  print("Button Pushed");
+Future<String?> selectFile() async {
+  debugLog("selectFile Button pushed");
   FilePickerResult? result = await FilePicker.platform.pickFiles();
 
   if (result != null) {
     //File file = File(result.files.single.path!);
-    print(result.files.single.path!);
+    debugLog(result.files.single.path!);
+    return result.files.single.path;
   } else {
-    // User canceled the picker
+    return null;
   }
 }
 
 class DayPage extends StatelessWidget {
-  const DayPage({super.key});
+  final AdventOfCodeDays day;
+  const DayPage(this.day, {super.key});
 
   @override
   Widget build(BuildContext context) {
+    var state = context.watch<MyAppState>();
     return Center(
       child: Column(
         children: [
           Row(
             children: [
-              TextButton(onPressed: selectFile, child: Text("Select Input")),
+              TextButton(
+                onPressed: () async {
+                  var selectedFile = await selectFile();
+                  state.setSelectedFile(day, selectedFile);
+                },
+                child: Text("Select Input"),
+              ),
               SizedBox(
                 width: 300,
                 child: TextField(
                   decoration: InputDecoration(
                     border: OutlineInputBorder(),
-                    hintText: 'Input File Path',
+                    //hintText: 'Input File Path',
+                    hintText: state.getSelectedFile(day),
                   ),
                 ),
               ),
             ],
           ),
           Row(
-            children: [TextButton(onPressed: selectFile, child: Text("Run"))],
+            children: [
+              TextButton(
+                onPressed: () async {
+                  debugLog("RUNNING $day!");
+                },
+                child: Text("Run"),
+              ),
+            ],
           ),
           Expanded(
             child: Row(

lib/main.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'days_enum.dart';
 import 'day_page.dart';
+import "util.dart";
 
 void main() {
   runApp(MyApp());
@@ -28,7 +29,28 @@ class MyApp extends StatelessWidget {
   }
 }
 
+class DayPageState {
+  String? selectedFile;
+}
+
 class MyAppState extends ChangeNotifier {
+  Map<AdventOfCodeDays, DayPageState> dayPageState = {};
+
+  MyAppState() {
+    for (var day in AdventOfCodeDays.values) {
+      dayPageState[day] = DayPageState();
+    }
+  }
+
+  String? getSelectedFile(AdventOfCodeDays day) {
+    return dayPageState[day]?.selectedFile;
+  }
+
+  void setSelectedFile(AdventOfCodeDays day, String? file) {
+    debugLog("setSelectedFile called on $day");
+    dayPageState[day]?.selectedFile = file;
+    notifyListeners();
+  }
 }
 
 class MyHomePage extends StatefulWidget {
@@ -56,7 +78,7 @@ class _MyHomePageState extends State<MyHomePage> {
     }
     var colorScheme = Theme.of(context).colorScheme;
 
-    Widget page = DayPage();
+    Widget page = DayPage(AdventOfCodeDays.day1);
 
     // The container for the current page, with its background color
     // and subtle switching animation.

lib/util.dart

@@ -0,0 +1,7 @@
+import 'package:flutter/foundation.dart';
+
+void debugLog(String? msg, {int? wrapWidth}) {
+  if (kDebugMode) {
+    debugPrint(msg, wrapWidth: wrapWidth);
+  }
+}