add filter panel to calculator

lib/components/calculator/calculator.dart

@@ -133,6 +133,11 @@ class RouteCalculator extends StatefulWidget {
 
 class _RouteCalculatorState extends State<RouteCalculator> {
   List<Station> allStations = [];
+  List<String> _networks = [];
+  List<String> _countries = [];
+  List<String> _selectedNetworks = [];
+  List<String> _selectedCountries = [];
+  bool _loadingStations = false;
 
   RouteResult? _routeResult;
   RouteResult? get result => _routeResult;
@@ -150,14 +155,31 @@ class _RouteCalculatorState extends State<RouteCalculator> {
       }
       WidgetsBinding.instance.addPostFrameCallback((_) async {
         final data = context.read<DataService>();
-        final result = await data.fetchStations();
+        await data.fetchStationFilters();
-        if (mounted) {
+        if (!mounted) return;
-          setState(() => allStations = result);
+        setState(() {
-        }
+          _networks = data.stationNetworks;
+          _countries = data.stationCountryNetworks.keys.toList();
+        });
+        await _loadStations();
       });
     }
   }
 
+  Future<void> _loadStations() async {
+    setState(() => _loadingStations = true);
+    final data = context.read<DataService>();
+    final stations = await data.fetchStations(
+      countries: _selectedCountries,
+      networks: _selectedNetworks,
+    );
+    if (!mounted) return;
+    setState(() {
+      allStations = stations;
+      _loadingStations = false;
+    });
+  }
+
   Future<void> _calculateRoute(List<String> stations) async {
     setState(() {
       _errorMessage = null;
@@ -215,6 +237,43 @@ class _RouteCalculatorState extends State<RouteCalculator> {
     final data = context.watch<DataService>();
     return Column(
       children: [
+        Padding(
+          padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8),
+          child: Wrap(
+            spacing: 12,
+            runSpacing: 12,
+            crossAxisAlignment: WrapCrossAlignment.center,
+            children: [
+              _MultiSelectFilter(
+                label: 'Countries',
+                options: _countries,
+                selected: _selectedCountries,
+                onChanged: (vals) {
+                  setState(() => _selectedCountries = vals);
+                  _loadStations();
+                },
+              ),
+              _MultiSelectFilter(
+                label: 'Networks',
+                options: _networks,
+                selected: _selectedNetworks,
+                onChanged: (vals) {
+                  setState(() => _selectedNetworks = vals);
+                  _loadStations();
+                },
+              ),
+              if (_loadingStations)
+                const Padding(
+                  padding: EdgeInsets.only(left: 8.0),
+                  child: SizedBox(
+                    height: 20,
+                    width: 20,
+                    child: CircularProgressIndicator(strokeWidth: 2),
+                  ),
+                ),
+            ],
+          ),
+        ),
         Expanded(
           child: ReorderableListView(
             buildDefaultDragHandles: false,
@@ -300,32 +359,27 @@ class _RouteCalculatorState extends State<RouteCalculator> {
         else
           SizedBox.shrink(),
         const SizedBox(height: 10),
-        LayoutBuilder(
+        Padding(
-          builder: (context, constraints) {
+          padding: const EdgeInsets.symmetric(horizontal: 16.0),
-            double screenWidth = constraints.maxWidth;
+          child: Wrap(
-
+            alignment: WrapAlignment.center,
-            return Padding(
+            spacing: 12,
-              padding: EdgeInsets.only(right: screenWidth < 450 ? 70 : 0),
+            runSpacing: 8,
-              child: Row(
+            children: [
-                mainAxisAlignment: MainAxisAlignment.center,
+              ElevatedButton.icon(
-                children: [
+                icon: const Icon(Icons.add),
-                  ElevatedButton.icon(
+                label: const Text('Add Station'),
-                    icon: const Icon(Icons.add),
+                onPressed: _addStation,
-                    label: const Text('Add Station'),
-                    onPressed: _addStation,
-                  ),
-                  const SizedBox(width: 16),
-                  ElevatedButton.icon(
-                    icon: const Icon(Icons.route),
-                    label: const Text('Calculate Route'),
-                    onPressed: () async {
-                      await _calculateRoute(data.stations);
-                    },
-                  ),
-                ],
               ),
-            );
+              ElevatedButton.icon(
-          },
+                icon: const Icon(Icons.route),
+                label: const Text('Calculate Route'),
+                onPressed: () async {
+                  await _calculateRoute(data.stations);
+                },
+              ),
+            ],
+          ),
         ),
 
         const SizedBox(height: 16),
@@ -350,3 +404,159 @@ Widget debugPanel(List<String> stations) {
     ),
   );
 }
+
+class _MultiSelectFilter extends StatefulWidget {
+  const _MultiSelectFilter({
+    required this.label,
+    required this.options,
+    required this.selected,
+    required this.onChanged,
+  });
+
+  final String label;
+  final List<String> options;
+  final List<String> selected;
+  final ValueChanged<List<String>> onChanged;
+
+  @override
+  State<_MultiSelectFilter> createState() => _MultiSelectFilterState();
+}
+
+class _MultiSelectFilterState extends State<_MultiSelectFilter> {
+  late List<String> _tempSelected;
+  String _query = '';
+
+  @override
+  void initState() {
+    super.initState();
+    _tempSelected = List.from(widget.selected);
+  }
+
+  @override
+  void didUpdateWidget(covariant _MultiSelectFilter oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (oldWidget.selected != widget.selected) {
+      _tempSelected = List.from(widget.selected);
+    }
+  }
+
+  void _openPicker() async {
+    _tempSelected = List.from(widget.selected);
+    _query = '';
+    await showModalBottomSheet<void>(
+      context: context,
+      isScrollControlled: true,
+      builder: (ctx) {
+        return StatefulBuilder(
+          builder: (ctx, setModalState) {
+            final filtered = widget.options
+                .where((opt) =>
+                    _query.isEmpty || opt.toLowerCase().contains(_query.toLowerCase()))
+                .toList();
+            return SafeArea(
+              child: Padding(
+                padding: const EdgeInsets.all(16.0),
+                child: Column(
+                  mainAxisSize: MainAxisSize.min,
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Row(
+                      children: [
+                        Text(
+                          'Select ${widget.label.toLowerCase()}',
+                          style: Theme.of(context).textTheme.titleMedium?.copyWith(
+                                fontWeight: FontWeight.w700,
+                              ),
+                        ),
+                        const Spacer(),
+                        TextButton(
+                          onPressed: () {
+                            setModalState(() {
+                              _tempSelected.clear();
+                            });
+                            Navigator.of(ctx).pop();
+                            widget.onChanged(const []);
+                          },
+                          child: const Text('Clear'),
+                        ),
+                      ],
+                    ),
+                    const SizedBox(height: 8),
+                    TextField(
+                      decoration: const InputDecoration(
+                        labelText: 'Search',
+                        border: OutlineInputBorder(),
+                      ),
+                      onChanged: (val) {
+                        setModalState(() {
+                          _query = val;
+                        });
+                      },
+                    ),
+                    const SizedBox(height: 12),
+                    SizedBox(
+                      height: 320,
+                      child: ListView.builder(
+                        itemCount: filtered.length,
+                        itemBuilder: (_, index) {
+                          final option = filtered[index];
+                          final selected = _tempSelected.contains(option);
+                          return CheckboxListTile(
+                            value: selected,
+                            title: Text(option),
+                            onChanged: (val) {
+                              setModalState(() {
+                                if (val == true) {
+                                  if (!_tempSelected.contains(option)) {
+                                    _tempSelected.add(option);
+                                  }
+                                } else {
+                                  _tempSelected.removeWhere((e) => e == option);
+                                }
+                              });
+                              widget.onChanged(List.from(_tempSelected.toSet()));
+                            },
+                          );
+                        },
+                      ),
+                    ),
+                    const SizedBox(height: 12),
+                    Align(
+                      alignment: Alignment.centerRight,
+                      child: FilledButton.icon(
+                        onPressed: () {
+                          widget.onChanged(List.from(_tempSelected.toSet()));
+                          Navigator.of(ctx).pop();
+                        },
+                        icon: const Icon(Icons.check),
+                        label: const Text('Apply'),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            );
+          },
+        );
+      },
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final hasSelection = widget.selected.isNotEmpty;
+    final display =
+        hasSelection ? widget.selected.join(', ') : 'Any ${widget.label.toLowerCase()}';
+    return OutlinedButton.icon(
+      onPressed: _openPicker,
+      icon: const Icon(Icons.filter_alt),
+      label: SizedBox(
+        width: 180,
+        child: Text(
+          '${widget.label}: $display',
+          overflow: TextOverflow.ellipsis,
+        ),
+      ),
+    );
+  }
+}

lib/components/pages/traction/traction_page.dart

@@ -513,21 +513,10 @@ class _TractionPageState extends State<TractionPage> {
     if (widget.selectionMode) {
       return Scaffold(
         appBar: AppBar(
-          leadingWidth: 140,
+          leadingWidth: 56,
-          leading: Padding(
+          leading: IconButton(
-            padding: const EdgeInsets.only(left: 8.0),
+            icon: const Icon(Icons.arrow_back),
-            child: TextButton.icon(
+            onPressed: () => Navigator.of(context).pop(),
-              onPressed: () => Navigator.of(context).pop(),
-              icon: const Icon(Icons.arrow_back),
-              label: const Text('Back'),
-              style: TextButton.styleFrom(
-                padding: const EdgeInsets.symmetric(
-                  horizontal: 12,
-                  vertical: 10,
-                ),
-                foregroundColor: Theme.of(context).colorScheme.onSurface,
-              ),
-            ),
           ),
           title: null,
         ),

lib/components/traction/traction_card.dart

@@ -82,39 +82,68 @@ class TractionCard extends StatelessWidget {
               ],
             ),
             const SizedBox(height: 8),
-            Row(
+            LayoutBuilder(
-              children: [
+              builder: (context, constraints) {
-                TextButton.icon(
+                final isNarrow = constraints.maxWidth < 520;
-                  onPressed: onShowInfo,
+                final buttons = [
-                  icon: const Icon(Icons.info_outline),
-                  label: const Text('Details'),
-                ),
-                const SizedBox(width: 8),
-                TextButton.icon(
-                  onPressed: onOpenTimeline,
-                  icon: const Icon(Icons.timeline),
-                  label: const Text('Timeline'),
-                ),
-                if (hasMileageOrTrips && onOpenLegs != null) ...[
-                  const SizedBox(width: 8),
                   TextButton.icon(
-                    onPressed: onOpenLegs,
+                    onPressed: onShowInfo,
-                    icon: const Icon(Icons.view_list),
+                    icon: const Icon(Icons.info_outline),
-                    label: const Text('Legs'),
+                    label: const Text('Details'),
                   ),
-                ],
-                const Spacer(),
-                if (selectionMode && onToggleSelect != null)
                   TextButton.icon(
-                    onPressed: onToggleSelect,
+                    onPressed: onOpenTimeline,
-                    icon: Icon(
+                    icon: const Icon(Icons.timeline),
-                      isSelected
+                    label: const Text('Timeline'),
-                          ? Icons.remove_circle_outline
+                  ),
-                          : Icons.add_circle_outline,
+                  if (hasMileageOrTrips && onOpenLegs != null)
+                    TextButton.icon(
+                      onPressed: onOpenLegs,
+                      icon: const Icon(Icons.view_list),
+                      label: const Text('Legs'),
                     ),
-                    label: Text(isSelected ? 'Remove' : 'Add to entry'),
+                ];
-                  ),
+
-              ],
+                final addButton = selectionMode && onToggleSelect != null
+                    ? TextButton.icon(
+                        onPressed: onToggleSelect,
+                        icon: Icon(
+                          isSelected
+                              ? Icons.remove_circle_outline
+                              : Icons.add_circle_outline,
+                        ),
+                        label: Text(isSelected ? 'Remove' : 'Add to entry'),
+                      )
+                    : null;
+
+                if (isNarrow) {
+                  return Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Wrap(
+                        spacing: 8,
+                        runSpacing: 4,
+                        children: buttons,
+                      ),
+                      if (addButton != null) ...[
+                        const SizedBox(height: 6),
+                        addButton,
+                      ],
+                    ],
+                  );
+                }
+
+                return Row(
+                  children: [
+                    ...buttons.expand((btn) sync* {
+                      yield btn;
+                      yield const SizedBox(width: 8);
+                    }).take(buttons.length * 2 - 1),
+                    const Spacer(),
+                    if (addButton != null) addButton,
+                  ],
+                );
+              },
             ),
             Wrap(
               spacing: 8,

lib/services/data_service/data_service_core.dart

@@ -72,9 +72,14 @@ class DataService extends ChangeNotifier {
   bool get isEventFieldsLoading => _isEventFieldsLoading;
 
   // Station Data
-  List<Station>? _cachedStations;
+  final Map<String, List<Station>> _stationCache = {};
-  DateTime? _stationsFetchedAt;
+  final Map<String, Future<List<Station>>?> _stationInFlightByKey = {};
-  Future<List<Station>>? _stationsInFlight;
+  List<String> _stationNetworks = [];
+  Map<String, List<String>> _stationCountryNetworks = {};
+  DateTime? _stationFiltersFetchedAt;
+  List<String> get stationNetworks => _stationNetworks;
+  Map<String, List<String>> get stationCountryNetworks =>
+      _stationCountryNetworks;
 
   List<String> stations = [""];
 
@@ -365,37 +370,75 @@ class DataService extends ChangeNotifier {
         0;
   }
 
-  Future<List<Station>> fetchStations() async {
+  Future<void> fetchStationFilters() async {
     final now = DateTime.now();
-
+    if (_stationFiltersFetchedAt != null &&
-    // If cache exists and is less than 30 minutes old, return it
+        now.difference(_stationFiltersFetchedAt!) < const Duration(minutes: 30) &&
-    if (_cachedStations != null &&
+        _stationNetworks.isNotEmpty) {
-        _stationsFetchedAt != null &&
+      return;
-        now.difference(_stationsFetchedAt!) < Duration(minutes: 30)) {
-      return _cachedStations!;
     }
+    try {
+      final response = await api.get('/stations/filter');
+      if (response is List && response.isNotEmpty && response.first is Map) {
+        final map = Map<String, dynamic>.from(response.first as Map);
+        final networks = (map['networks'] as List? ?? const [])
+            .whereType<String>()
+            .toList();
+        final countryNetworksRaw =
+            map['country_networks'] as Map? ?? const <String, dynamic>{};
+        final countryNetworks = <String, List<String>>{};
+        countryNetworksRaw.forEach((key, value) {
+          if (value is List) {
+            countryNetworks[key] = value.whereType<String>().toList();
+          }
+        });
+        _stationNetworks = networks;
+        _stationCountryNetworks = countryNetworks;
+        _stationFiltersFetchedAt = now;
+      }
+    } catch (e) {
+      debugPrint('Failed to fetch station filters: $e');
+    }
+  }
 
-    if (_stationsInFlight != null) return _stationsInFlight!;
+  String _stationKey(List<String> countries, List<String> networks) {
+    final c = countries..sort();
+    final n = networks..sort();
+    return 'c:${c.join('|')};n:${n.join('|')}';
+  }
 
-    _stationsInFlight = () async {
+  Future<List<Station>> fetchStations({
+    List<String> countries = const [],
+    List<String> networks = const [],
+  }) async {
+    final key = _stationKey(List.from(countries), List.from(networks));
+
+    if (_stationCache.containsKey(key)) return _stationCache[key]!;
+    final inflight = _stationInFlightByKey[key];
+    if (inflight != null) return inflight;
+
+    final future = () async {
       try {
-        final response = await api.get('/location');
+        final response = await api.post('/location', {
+          'countries_filter': countries,
+          'network_filter': networks,
+        });
         if (response is! List) return const <Station>[];
         final parsed = response
             .whereType<Map>()
             .map((e) => Station.fromJson(Map<String, dynamic>.from(e)))
             .toList();
-        _cachedStations = parsed;
+        _stationCache[key] = parsed;
-        _stationsFetchedAt = now;
         return parsed;
       } catch (e) {
         debugPrint('Failed to fetch stations: $e');
         return const <Station>[];
       } finally {
-        _stationsInFlight = null;
+        _stationInFlightByKey.remove(key);
       }
     }();
 
-    return _stationsInFlight!;
+    _stationInFlightByKey[key] = future;
+    return future;
   }
 }

lib/ui/app_shell.dart

@@ -84,8 +84,9 @@ class _MyAppState extends State<MyApp> {
       redirect: (context, state) {
         final loggedIn = auth.isLoggedIn;
         final loggingIn = state.uri.toString() == '/login';
+        final atSettings = state.uri.toString() == '/settings';
 
-        if (!loggedIn && !loggingIn) return '/login';
+        if (!loggedIn && !loggingIn && !atSettings) return '/login';
         if (loggedIn && loggingIn) return '/';
         return null;
       },
@@ -155,13 +156,13 @@ class _MyAppState extends State<MyApp> {
                 return NewEntryPage(editLegId: legId);
               },
             ),
-            GoRoute(
-              path: '/settings',
-              builder: (context, state) => const SettingsPage(),
-            ),
           ],
         ),
         GoRoute(path: '/login', builder: (context, state) => const LoginScreen()),
+        GoRoute(
+          path: '/settings',
+          builder: (context, state) => const SettingsPage(),
+        ),
       ],
     );
   }

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: 0.3.2+1
+version: 0.3.3+1
 
 environment:
   sdk: ^3.8.1