QoL changes

lib/services/dataService.dart

@@ -61,6 +61,10 @@ class DataService extends ChangeNotifier {
   List<String> get locoClasses => _locoClasses;
   List<TripSummary> _tripList = [];
   List<TripSummary> get tripList => _tripList;
+  List<EventField> _eventFields = [];
+  List<EventField> get eventFields => _eventFields;
+  bool _isEventFieldsLoading = false;
+  bool get isEventFieldsLoading => _isEventFieldsLoading;
 
   // Station Data
   List<Station>? _cachedStations;
@@ -73,6 +77,17 @@ class DataService extends ChangeNotifier {
   bool _isOnThisDayLoading = false;
   bool get isOnThisDayLoading => _isOnThisDayLoading;
 
+  static const List<EventField> _fallbackEventFields = [
+    EventField(name: 'operator', display: 'Operator'),
+    EventField(name: 'status', display: 'Status'),
+    EventField(name: 'evn', display: 'EVN'),
+    EventField(name: 'owner', display: 'Owner'),
+    EventField(name: 'location', display: 'Location'),
+    EventField(name: 'livery', display: 'Livery'),
+    EventField(name: 'domain', display: 'Domain'),
+    EventField(name: 'type', display: 'Type'),
+  ];
+
   void _notifyAsync() {
     // Always defer to the next frame to avoid setState during build.
     SchedulerBinding.instance.addPostFrameCallback((_) {
@@ -260,6 +275,75 @@ class DataService extends ChangeNotifier {
     }
   }
 
+  Future<List<TripLocoStat>> fetchTripLocoStats(int tripId) async {
+    try {
+      final json = await api.get('/trips/stats?trip_id=$tripId');
+      if (json is List) {
+        return json
+            .whereType<Map<String, dynamic>>()
+            .map((e) => TripLocoStat.fromJson(e))
+            .toList();
+      }
+      if (json is Map && json['locos'] is List) {
+        return (json['locos'] as List)
+            .whereType<Map<String, dynamic>>()
+            .map((e) => TripLocoStat.fromJson(e))
+            .toList();
+      }
+      return [];
+    } catch (e) {
+      debugPrint('Failed to fetch trip loco stats: $e');
+      return [];
+    }
+  }
+
+  Future<void> fetchEventFields({bool force = false}) async {
+    if (_eventFields.isNotEmpty && !force) return;
+    _isEventFieldsLoading = true;
+    _notifyAsync();
+    try {
+      final json = await api.get('/event/fields');
+      List<EventField> fields = _parseEventFields(json);
+      if (fields.isEmpty) {
+        fields = _fallbackEventFields;
+      }
+      _eventFields = fields;
+    } catch (e) {
+      debugPrint('Failed to fetch event fields: $e');
+      _eventFields = _fallbackEventFields;
+    } finally {
+      _isEventFieldsLoading = false;
+      _notifyAsync();
+    }
+  }
+
+  List<EventField> _parseEventFields(dynamic json) {
+    if (json is List) {
+      return json
+          .whereType<Map<String, dynamic>>()
+          .map(EventField.fromJson)
+          .toList();
+    }
+    if (json is Map) {
+      if (json['fields'] is List) {
+        return (json['fields'] as List)
+            .whereType<Map<String, dynamic>>()
+            .map(EventField.fromJson)
+            .toList();
+      }
+      // If map of name -> definition
+      return json.entries
+          .where((entry) => entry.value is Map<String, dynamic>)
+          .map((entry) {
+            final map = Map<String, dynamic>.from(entry.value);
+            map['name'] = entry.key;
+            return EventField.fromJson(map);
+          })
+          .toList();
+    }
+    return [];
+  }
+
   Future<void> fetchTrips() async {
     try {
       final json = await api.get('/trips/mileage');
@@ -314,6 +398,7 @@ class DataService extends ChangeNotifier {
     _onThisDay = [];
     _trips = [];
     _tripDetails = [];
+    _eventFields = [];
     _notifyAsync();
   }