increment version

android/app/build.gradle.kts

@@ -45,7 +45,7 @@ android {
 
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId = "com.example.mileograph_flutter"
+        applicationId = "com.petegregoryy.mileograph_flutter"
         // You can update the following values to match your application needs.
         // For more information, see: https://flutter.dev/to/review-gradle-config.
         minSdk = flutter.minSdkVersion

lib/components/pages/new_entry/new_entry.dart

@@ -4,6 +4,7 @@ import 'dart:convert';
 import 'package:collection/collection.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:go_router/go_router.dart';
 import 'package:intl/intl.dart';
 import 'package:mileograph_flutter/components/calculator/calculator.dart';
 import 'package:mileograph_flutter/components/pages/traction.dart';

lib/components/pages/new_entry/new_entry_page.dart

@@ -10,6 +10,7 @@ class NewEntryPage extends StatefulWidget {
 }
 
 class _NewEntryPageState extends State<NewEntryPage> {
+  late final NavigationGuardCallback _exitGuard;
   final _formKey = GlobalKey<FormState>();
   DateTime _selectedDate = DateTime.now();
   TimeOfDay _selectedTime = TimeOfDay.now();
@@ -40,7 +41,8 @@ class _NewEntryPageState extends State<NewEntryPage> {
   @override
   void initState() {
     super.initState();
-    NavigationGuard.register(_handleExitIntent);
+    _exitGuard = _handleExitIntent;
+    NavigationGuard.register(_exitGuard);
     // legacy single-draft auto-save listeners removed in favor of explicit multi-draft flow
     Future.microtask(() {
       if (!mounted) return;
@@ -58,7 +60,7 @@ class _NewEntryPageState extends State<NewEntryPage> {
 
   @override
   void dispose() {
-    NavigationGuard.unregister(_handleExitIntent);
+    NavigationGuard.unregister(_exitGuard);
     _startController.dispose();
     _endController.dispose();
     _headcodeController.dispose();
@@ -586,7 +588,12 @@ class _NewEntryPageState extends State<NewEntryPage> {
         if (didPop) return;
         final allow = await _handleExitIntent();
         if (allow && context.mounted) {
-          Navigator.of(context).maybePop();
+          final router = GoRouter.of(context);
+          if (router.canPop()) {
+            context.pop();
+          } else {
+            context.go('/');
+          }
         }
       },
       child: Scaffold(
@@ -597,7 +604,12 @@ class _NewEntryPageState extends State<NewEntryPage> {
                   onPressed: () async {
                     if (!await _handleExitIntent()) return;
                     if (!context.mounted) return;
-                    Navigator.of(context).maybePop();
+                    final router = GoRouter.of(context);
+                    if (router.canPop()) {
+                      context.pop();
+                    } else {
+                      context.go('/');
+                    }
                   },
                 ),
                 title: const Text('Edit entry'),

lib/services/data_service/data_service_core.dart

@@ -209,22 +209,46 @@ class DataService extends ChangeNotifier {
     final target = date ?? DateTime.now();
     final formatted =
         "${target.year.toString().padLeft(4, '0')}-${target.month.toString().padLeft(2, '0')}-${target.day.toString().padLeft(2, '0')}";
+    final endpoint = '/legs/on-this-day?date=$formatted';
+    dynamic json;
+    Object? lastError;
+    for (int attempt = 0; attempt < 2; attempt++) {
+      try {
+        json = await api.get(endpoint);
+        lastError = null;
+        break;
+      } catch (e) {
+        lastError = e;
+        if (!_looksLikeOnThisDayRoutingConflict(e)) break;
+        await Future<void>.delayed(const Duration(milliseconds: 250));
+      }
+    }
+
     try {
-      final json = await api.get('/legs/on-this-day?date=$formatted');
       if (json is List) {
         _onThisDay = json.map((e) => Leg.fromJson(e)).toList();
       } else {
         _onThisDay = [];
       }
     } catch (e) {
-      debugPrint('Failed to fetch on-this-day legs: $e');
+      lastError ??= e;
       _onThisDay = [];
     } finally {
+      if (lastError != null) {
+        debugPrint('Failed to fetch on-this-day legs ($endpoint): $lastError');
+      }
       _isOnThisDayLoading = false;
       _notifyAsync();
     }
   }
 
+  bool _looksLikeOnThisDayRoutingConflict(Object error) {
+    final msg = error.toString();
+    return msg.contains('API error 422') &&
+        msg.contains('[path, loco_id]') &&
+        msg.contains('input: on-this-day');
+  }
+
   Future<void> fetchEventFields({bool force = false}) async {
     if (_eventFields.isNotEmpty && !force) return;
     _isEventFieldsLoading = true;

lib/services/navigation_guard.dart

@@ -7,9 +7,10 @@ class NavigationGuard {
     _callback = callback;
   }
 
-  static void unregister(NavigationGuardCallback callback) {
-    if (_callback == callback) {
+  static void unregister([NavigationGuardCallback? callback]) {
+    if (callback == null || identical(_callback, callback)) {
       _callback = null;
+      _promptActive = false;
     }
   }
 

lib/ui/app_shell.dart

@@ -1,5 +1,6 @@
 import 'package:dynamic_color/dynamic_color.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:go_router/go_router.dart';
 import 'package:mileograph_flutter/components/login/login.dart';
 import 'package:mileograph_flutter/components/pages/calculator.dart';
@@ -17,6 +18,28 @@ import 'package:mileograph_flutter/services/data_service.dart';
 import 'package:mileograph_flutter/services/navigation_guard.dart';
 import 'package:provider/provider.dart';
 
+final GlobalKey<NavigatorState> _shellNavigatorKey = GlobalKey<NavigatorState>();
+
+const List<String> _contentPages = [
+  "/",
+  "/calculator",
+  "/legs",
+  "/traction",
+  "/trips",
+  "/add",
+];
+
+const int _addTabIndex = 5;
+
+int tabIndexForPath(String path) {
+  final newIndex = _contentPages.indexWhere((routePath) {
+    if (path == routePath) return true;
+    if (routePath == '/') return path == '/';
+    return path.startsWith('$routePath/');
+  });
+  return newIndex < 0 ? 0 : newIndex;
+}
+
 class MyApp extends StatefulWidget {
   const MyApp({super.key});
 
@@ -52,6 +75,7 @@ class _MyAppState extends State<MyApp> {
       },
       routes: [
         ShellRoute(
+          navigatorKey: _shellNavigatorKey,
           builder: (context, state, child) => MyHomePage(child: child),
           routes: [
             GoRoute(path: '/', builder: (context, state) => const Dashboard()),
@@ -153,26 +177,7 @@ class MyHomePage extends StatefulWidget {
 }
 
 class _MyHomePageState extends State<MyHomePage> {
-  final List<String> contentPages = [
-    "/",
-    "/calculator",
-    "/legs",
-    "/traction",
-    "/trips",
-    "/add",
-  ];
-
-  int _getIndexFromLocation(String location) {
-    int newIndex = contentPages.indexWhere((path) {
-      if (location == path) return true;
-      if (path == '/') return location == '/';
-      return location.startsWith('$path/');
-    });
-    if (newIndex < 0) {
-      return 0;
-    }
-    return newIndex;
-  }
+  List<String> get contentPages => _contentPages;
 
   Future<void> _onItemTapped(int index, int currentIndex) async {
     if (index < 0 || index >= contentPages.length || index == currentIndex) {
@@ -184,6 +189,10 @@ class _MyHomePageState extends State<MyHomePage> {
     });
   }
 
+  int? _lastTabIndex;
+  final List<int> _tabHistory = [];
+  bool _handlingBackNavigation = false;
+
   bool _fetched = false;
 
   @override
@@ -221,8 +230,12 @@ class _MyHomePageState extends State<MyHomePage> {
 
   @override
   Widget build(BuildContext context) {
-    final location = GoRouterState.of(context).uri.toString();
-    final pageIndex = _getIndexFromLocation(location);
+    final uri = GoRouterState.of(context).uri;
+    final pageIndex = tabIndexForPath(uri.path);
+    _recordTabChange(pageIndex);
+    if (pageIndex != _addTabIndex) {
+      NavigationGuard.unregister();
+    }
     final homepageReady = context.select<DataService, bool>(
       (data) => data.homepageStats != null || !data.isHomepageLoading,
     );
@@ -232,42 +245,90 @@ class _MyHomePageState extends State<MyHomePage> {
         ? widget.child
         : const Center(child: CircularProgressIndicator());
 
-    return Scaffold(
-      appBar: AppBar(
-        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
-        title: Text.rich(
-          TextSpan(
-            children: const [
-              TextSpan(text: "Mile"),
-              TextSpan(text: "O", style: TextStyle(color: Colors.red)),
-              TextSpan(text: "graph"),
-            ],
-            style: const TextStyle(
-              decoration: TextDecoration.none,
-              color: Colors.white,
-              fontFamily: "Tomatoes",
+    return PopScope(
+      canPop: false,
+      onPopInvokedWithResult: (didPop, _) async {
+        if (didPop) return;
+
+        final shellNav = _shellNavigatorKey.currentState;
+        if (shellNav != null && shellNav.canPop()) {
+          shellNav.pop();
+          return;
+        }
+
+        if (_tabHistory.isNotEmpty) {
+          final previousTab = _tabHistory.removeLast();
+          if (!mounted) return;
+          _handlingBackNavigation = true;
+          context.go(contentPages[previousTab]);
+          return;
+        }
+
+        if (pageIndex != 0) {
+          if (!mounted) return;
+          _handlingBackNavigation = true;
+          context.go(contentPages[0]);
+          return;
+        }
+
+        SystemNavigator.pop();
+      },
+      child: Scaffold(
+        appBar: AppBar(
+          backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+          title: Text.rich(
+            TextSpan(
+              children: const [
+                TextSpan(text: "Mile"),
+                TextSpan(text: "O", style: TextStyle(color: Colors.red)),
+                TextSpan(text: "graph"),
+              ],
+              style: const TextStyle(
+                decoration: TextDecoration.none,
+                color: Colors.white,
+                fontFamily: "Tomatoes",
+              ),
             ),
           ),
+          actions: [
+            const IconButton(onPressed: null, icon: Icon(Icons.account_circle)),
+            IconButton(onPressed: auth.logout, icon: const Icon(Icons.logout)),
+          ],
         ),
-        actions: [
-          const IconButton(onPressed: null, icon: Icon(Icons.account_circle)),
-          IconButton(onPressed: auth.logout, icon: const Icon(Icons.logout)),
-        ],
+        bottomNavigationBar: NavigationBar(
+          selectedIndex: pageIndex,
+          onDestinationSelected: (int index) => _onItemTapped(index, pageIndex),
+          destinations: const [
+            NavigationDestination(icon: Icon(Icons.home), label: "Home"),
+            NavigationDestination(icon: Icon(Icons.route), label: "Calculator"),
+            NavigationDestination(icon: Icon(Icons.list), label: "Entries"),
+            NavigationDestination(icon: Icon(Icons.train), label: "Traction"),
+            NavigationDestination(icon: Icon(Icons.book), label: "Trips"),
+            NavigationDestination(icon: Icon(Icons.add), label: "Add"),
+          ],
+        ),
+        body: currentPage,
       ),
-      bottomNavigationBar: NavigationBar(
-        selectedIndex: pageIndex,
-        onDestinationSelected: (int index) => _onItemTapped(index, pageIndex),
-        destinations: const [
-          NavigationDestination(icon: Icon(Icons.home), label: "Home"),
-          NavigationDestination(icon: Icon(Icons.route), label: "Calculator"),
-          NavigationDestination(icon: Icon(Icons.list), label: "Entries"),
-          NavigationDestination(icon: Icon(Icons.train), label: "Traction"),
-          NavigationDestination(icon: Icon(Icons.book), label: "Trips"),
-          NavigationDestination(icon: Icon(Icons.add), label: "Add"),
-        ],
-      ),
-      body: currentPage,
     );
   }
-}
 
+  void _recordTabChange(int pageIndex) {
+    final last = _lastTabIndex;
+    if (last == null) {
+      _lastTabIndex = pageIndex;
+      return;
+    }
+    if (last == pageIndex) return;
+
+    if (_handlingBackNavigation) {
+      _handlingBackNavigation = false;
+      _lastTabIndex = pageIndex;
+      return;
+    }
+
+    if (_tabHistory.isEmpty || _tabHistory.last != last) {
+      _tabHistory.add(last);
+    }
+    _lastTabIndex = pageIndex;
+  }
+}

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: "none" # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 0.2.3+1
+version: 0.2.4+1
 
 environment:
   sdk: ^3.8.1

test/app_shell_test.dart

@@ -0,0 +1,20 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mileograph_flutter/ui/app_shell.dart';
+
+void main() {
+  test('tabIndexForPath maps nested routes', () {
+    expect(tabIndexForPath('/'), 0);
+    expect(tabIndexForPath('/calculator'), 1);
+    expect(tabIndexForPath('/calculator/details'), 1);
+    expect(tabIndexForPath('/legs'), 2);
+    expect(tabIndexForPath('/traction/12/timeline'), 3);
+    expect(tabIndexForPath('/trips'), 4);
+    expect(tabIndexForPath('/add'), 5);
+  });
+
+  test('tabIndexForPath ignores query when parsing uri', () {
+    expect(tabIndexForPath(Uri.parse('/trips?sort=desc').path), 4);
+    expect(tabIndexForPath(Uri.parse('/calculator/details?x=1').path), 1);
+  });
+}
+