add back button functionality

android/app/src/main/AndroidManifest.xml

@@ -1,4 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <uses-permission android:name="android.permission.INTERNET"/>
     <application
         android:label="mileograph_flutter"
         android:name="${applicationName}"

lib/components/calculator/calculator.dart

@@ -5,31 +5,6 @@ import 'package:mileograph_flutter/services/apiService.dart';
 import 'package:mileograph_flutter/services/dataService.dart';
 import './routeSummaryWidget.dart';
 
-class RouteCalculatorLoader extends StatelessWidget {
-  const RouteCalculatorLoader({super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    final data = context.read<DataService>();
-
-    return FutureBuilder<List<Station>>(
-      future: data.fetchStations(),
-      builder: (context, snapshot) {
-        if (snapshot.connectionState != ConnectionState.done) {
-          return const Center(child: CircularProgressIndicator());
-        }
-
-        if (snapshot.hasError) {
-          return Center(child: Text('Error: ${snapshot.error}'));
-        }
-
-        final stations = snapshot.data!;
-        return RouteCalculator(allStations: stations);
-      },
-    );
-  }
-}
-
 class StationAutocomplete extends StatefulWidget {
   const StationAutocomplete({
     super.key,
@@ -105,16 +80,14 @@ class _StationAutocompleteState extends State<StationAutocomplete> {
 }
 
 class RouteCalculator extends StatefulWidget {
-  final List<Station> allStations;
+  const RouteCalculator({super.key});
-
-  const RouteCalculator({super.key, required this.allStations});
 
   @override
   State<RouteCalculator> createState() => _RouteCalculatorState();
 }
 
 class _RouteCalculatorState extends State<RouteCalculator> {
-  List<String> stations = [''];
+  List<Station> allStations = [];
 
   RouteResult? _routeResult;
   RouteResult? get result => _routeResult;
@@ -122,6 +95,23 @@ class _RouteCalculatorState extends State<RouteCalculator> {
 
   bool _showDetails = false;
 
+  bool _fetched = false;
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    if (!_fetched) {
+      _fetched = true;
+      WidgetsBinding.instance.addPostFrameCallback((_) async {
+        final data = context.read<DataService>();
+        final result = await data.fetchStations();
+        if (mounted) {
+          setState(() => allStations = result);
+        }
+      });
+    }
+  }
+
   Future<void> _calculateRoute(List<String> stations) async {
     setState(() {
       _errorMessage = null;
@@ -146,25 +136,29 @@ class _RouteCalculatorState extends State<RouteCalculator> {
   }
 
   void _addStation() {
+    final data = context.read<DataService>();
     setState(() {
-      stations.add('');
+      data.stations.add('');
     });
   }
 
   void _removeStation(int index) {
+    final data = context.read<DataService>();
     setState(() {
-      stations.removeAt(index);
+      data.stations.removeAt(index);
     });
   }
 
   void _updateStation(int index, String value) {
+    final data = context.read<DataService>();
     setState(() {
-      stations[index] = value;
+      data.stations[index] = value;
     });
   }
 
   @override
   Widget build(BuildContext context) {
+    final data = context.watch<DataService>();
     if (_showDetails && _routeResult != null) {
       return RouteDetailsView(
         route: _routeResult!.calculatedRoute,
@@ -180,13 +174,13 @@ class _RouteCalculatorState extends State<RouteCalculator> {
             onReorder: (oldIndex, newIndex) {
               if (newIndex > oldIndex) newIndex -= 1;
               setState(() {
-                final moved = stations.removeAt(oldIndex);
+                final moved = data.stations.removeAt(oldIndex);
-                stations.insert(newIndex, moved);
+                data.stations.insert(newIndex, moved);
               });
             },
-            children: List.generate(stations.length, (index) {
+            children: List.generate(data.stations.length, (index) {
               return Container(
-                key: ValueKey('$index-${stations[index]}'),
+                key: ValueKey('$index-${data.stations[index]}'),
                 margin: const EdgeInsets.symmetric(horizontal: 16, vertical: 4),
                 child: Row(
                   crossAxisAlignment: CrossAxisAlignment.start,
@@ -207,8 +201,8 @@ class _RouteCalculatorState extends State<RouteCalculator> {
                             children: [
                               Expanded(
                                 child: StationAutocomplete(
-                                  allStations: widget.allStations,
+                                  allStations: allStations,
-                                  initialValue: stations[index],
+                                  initialValue: data.stations[index],
                                   onChanged: (val) =>
                                       _updateStation(index, val),
                                 ),
@@ -244,7 +238,13 @@ class _RouteCalculatorState extends State<RouteCalculator> {
         else
           SizedBox.shrink(),
         const SizedBox(height: 10),
-        Row(
+        LayoutBuilder(
+          builder: (context, constraints) {
+            double screenWidth = constraints.maxWidth;
+
+            return Padding(
+              padding: EdgeInsets.only(right: screenWidth < 450 ? 70 : 0),
+              child: Row(
                 mainAxisAlignment: MainAxisAlignment.center,
                 children: [
                   ElevatedButton.icon(
@@ -257,11 +257,15 @@ class _RouteCalculatorState extends State<RouteCalculator> {
                     icon: const Icon(Icons.route),
                     label: const Text('Calculate Route'),
                     onPressed: () async {
-                await _calculateRoute(stations);
+                      await _calculateRoute(data.stations);
                     },
                   ),
                 ],
               ),
+            );
+          },
+        ),
+
         const SizedBox(height: 16),
       ],
     );

lib/components/pages/calculator.dart

@@ -5,6 +5,6 @@ import 'package:mileograph_flutter/services/dataService.dart';
 
 class CalculatorPage extends StatelessWidget {
   Widget build(BuildContext context) {
-    return RouteCalculatorLoader();
+    return RouteCalculator();
   }
 }

lib/components/pages/dashboard.dart

@@ -85,7 +85,11 @@ class DashboardHeader extends StatelessWidget {
         Expanded(
           child: ListView(
             scrollDirection: Axis.vertical,
-            children: [TopTractionPanel(), LeaderboardPanel()],
+            children: [
+              TopTractionPanel(),
+              LeaderboardPanel(),
+              SizedBox(height: 80),
+            ],
           ),
         ),
       ],

lib/main.dart

@@ -13,6 +13,8 @@ import 'components/login/login.dart';
 import 'components/pages/dashboard.dart';
 import 'components/dashboard/topTractionPanel.dart';
 
+import 'package:go_router/go_router.dart';
+
 late ApiService api;
 
 void main() {
@@ -46,19 +48,6 @@ void main() {
   );
 }
 
-class AppRoot extends StatelessWidget {
-  const AppRoot({super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    return Consumer<AuthService>(
-      builder: (context, auth, child) {
-        return auth.isLoggedIn ? MyHomePage() : LoginScreen();
-      },
-    );
-  }
-}
-
 class MyApp extends StatelessWidget {
   MyApp({super.key});
 
@@ -67,13 +56,48 @@ class MyApp extends StatelessWidget {
     seedColor: Colors.red,
     brightness: Brightness.dark,
   );
+
   // This widget is the root of your application.
   @override
   Widget build(BuildContext context) {
+    final GoRouter router = GoRouter(
+      refreshListenable: context
+          .read<AuthService>(), // `AuthService` extends `ChangeNotifier`
+      redirect: (context, state) {
+        final auth = Provider.of<AuthService>(context, listen: false);
+        final loggedIn = auth.isLoggedIn;
+        final loggingIn = state.uri.toString() == '/login';
+
+        // Redirect to login if not logged in and trying to access protected pages
+        if (!loggedIn && !loggingIn) return '/login';
+
+        // Redirect to home if already logged in and trying to go to login
+        if (loggedIn && loggingIn) return '/';
+
+        // No redirection
+        return null;
+      },
+      routes: [
+        ShellRoute(
+          builder: (context, state, child) {
+            return MyHomePage(child: child);
+          },
+          routes: [
+            GoRoute(path: '/', builder: (_, __) => const Dashboard()),
+            GoRoute(path: '/calculator', builder: (_, __) => CalculatorPage()),
+            GoRoute(path: '/legs', builder: (_, __) => LegsPage()),
+            GoRoute(path: '/traction', builder: (_, __) => TractionPage()),
+          ],
+        ),
+        GoRoute(path: '/login', builder: (_, __) => const LoginScreen()),
+      ],
+    );
+
     return DynamicColorBuilder(
       builder: (ColorScheme? lightDynamic, ColorScheme? darkDynamic) {
-        return MaterialApp(
+        return MaterialApp.router(
           title: 'Flutter Demo',
+          routerConfig: router,
           theme: ThemeData(
             useMaterial3: true,
             // This is the theme of your application.
@@ -98,7 +122,6 @@ class MyApp extends StatelessWidget {
             colorScheme: darkDynamic ?? defaultDark,
           ),
           themeMode: ThemeMode.system,
-          home: AppRoot(),
         );
       },
     );
@@ -106,7 +129,8 @@ class MyApp extends StatelessWidget {
 }
 
 class MyHomePage extends StatefulWidget {
-  const MyHomePage({super.key});
+  final Widget child;
+  const MyHomePage({super.key, required this.child});
 
   // 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
@@ -123,12 +147,12 @@ class MyHomePage extends StatefulWidget {
 
 class _MyHomePageState extends State<MyHomePage> {
   int pageIndex = 0;
-  final List<Widget> contentPages = [
+  final List<String> contentPages = [
-    Dashboard(),
+    "/",
-    CalculatorPage(),
+    "/calculator",
-    LegsPage(),
+    "/legs",
-    TractionPage(),
+    "/traction",
-    Center(child: Text("Trips Page")),
+    "/",
   ];
 
   bool loggedIn = false;
@@ -165,7 +189,7 @@ class _MyHomePageState extends State<MyHomePage> {
     final auth = context.read<AuthService>();
 
     if (data.homepageStats != null) {
-      currentPage = contentPages[pageIndex];
+      currentPage = widget.child;
     } else {
       currentPage = Center(child: CircularProgressIndicator());
     }
@@ -210,6 +234,7 @@ class _MyHomePageState extends State<MyHomePage> {
         onDestinationSelected: (int index) {
           setState(() {
             pageIndex = index;
+            context.push(contentPages[index]);
           });
         },
         destinations: [

lib/services/dataService.dart

@@ -23,6 +23,8 @@ class DataService extends ChangeNotifier {
   List<Station>? _cachedStations;
   DateTime? _stationsFetchedAt;
 
+  List<String> stations = [""];
+
   bool _isHomepageLoading = false;
   bool get isHomepageLoading => _isHomepageLoading;
 

pubspec.lock

@@ -83,6 +83,19 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_web_plugins:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  go_router:
+    dependency: "direct main"
+    description:
+      name: go_router
+      sha256: c489908a54ce2131f1d1b7cc631af9c1a06fac5ca7c449e959192089f9489431
+      url: "https://pub.dev"
+    source: hosted
+    version: "16.0.0"
   http:
     dependency: "direct main"
     description:
@@ -131,6 +144,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "6.0.0"
+  logging:
+    dependency: transitive
+    description:
+      name: logging
+      sha256: c8245ada5f1717ed44271ed1c26b8ce85ca3228fd2ffdb75468ab01979309d61
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.0"
   matcher:
     dependency: transitive
     description:
@@ -266,4 +287,4 @@ packages:
     version: "1.1.1"
 sdks:
   dart: ">=3.8.1 <4.0.0"
-  flutter: ">=3.18.0-18.0.pre.54"
+  flutter: ">=3.27.0"

pubspec.yaml

@@ -37,6 +37,7 @@ dependencies:
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.8
+  go_router: ^16.0.0
 
 dev_dependencies:
   flutter_test: