Layout changes, fix bugs in new entry page

lib/services/data_service/data_service_core.dart

@@ -44,6 +44,10 @@ class DataService extends ChangeNotifier {
   bool get isTractionLoading => _isTractionLoading;
   bool _tractionHasMore = false;
   bool get tractionHasMore => _tractionHasMore;
+  List<LocoChange> _latestLocoChanges = [];
+  List<LocoChange> get latestLocoChanges => _latestLocoChanges;
+  bool _isLatestLocoChangesLoading = false;
+  bool get isLatestLocoChangesLoading => _isLatestLocoChangesLoading;
   final Map<int, List<LocoAttrVersion>> _locoTimelines = {};
   final Map<int, bool> _isLocoTimelineLoading = {};
   List<LocoAttrVersion> timelineForLoco(int locoId) =>
@@ -148,7 +152,8 @@ class DataService extends ChangeNotifier {
       if (json is List) {
         final newLegs = json.map((e) => Leg.fromJson(e)).toList();
         _legs = append ? [..._legs, ...newLegs] : newLegs;
-        _legsHasMore = newLegs.length >= limit;
+        // Keep "load more" available as long as the server returns items; hide only on empty.
+        _legsHasMore = newLegs.isNotEmpty;
       } else {
         throw Exception('Unexpected legs response: $json');
       }
@@ -180,7 +185,7 @@ class DataService extends ChangeNotifier {
     final params =
         includeNonPowering ? '?include_non_powering=true' : '';
     try {
-      final json = await api.get('/legs/$locoId$params');
+      final json = await api.get('/legs/by-loco/$locoId$params');
       dynamic list = json;
       if (json is Map) {
         for (final key in ['legs', 'data', 'results']) {
@@ -340,6 +345,8 @@ class DataService extends ChangeNotifier {
     _eventFields = [];
     _locoTimelines.clear();
     _isLocoTimelineLoading.clear();
+    _latestLocoChanges = [];
+    _isLatestLocoChangesLoading = false;
     _notifyAsync();
   }
 

lib/services/data_service/data_service_traction.dart

@@ -114,5 +114,40 @@ extension DataServiceTraction on DataService {
     }
     return _locoClasses;
   }
-}
 
+  Future<void> fetchLatestLocoChanges({int limit = 25, int offset = 0}) async {
+    _isLatestLocoChangesLoading = true;
+    _notifyAsync();
+    try {
+      final json =
+          await api.get('/loco/changes/latest?limit=$limit&offset=$offset');
+      dynamic results = json;
+      if (json is Map && json['data'] is List) {
+        results = json['data'];
+      }
+      if (results is List) {
+        final parsed = <LocoChange>[];
+        for (final item in results) {
+          if (item is Map<String, dynamic>) {
+            parsed.add(LocoChange.fromJson(item));
+          } else if (item is Map) {
+            parsed.add(
+              LocoChange.fromJson(
+                item.map((key, value) => MapEntry(key.toString(), value)),
+              ),
+            );
+          }
+        }
+        _latestLocoChanges = parsed;
+      } else {
+        throw Exception('Unexpected latest loco changes response: $json');
+      }
+    } catch (e) {
+      debugPrint('Failed to fetch latest loco changes: $e');
+      _latestLocoChanges = [];
+    } finally {
+      _isLatestLocoChangesLoading = false;
+      _notifyAsync();
+    }
+  }
+}

lib/services/data_service/data_service_trips.dart

@@ -83,5 +83,50 @@ extension DataServiceTrips on DataService {
       _notifyAsync();
     }
   }
-}
 
+  Future<void> fetchTripOptions() async {
+    try {
+      final json = await api.get('/trips');
+      Iterable<dynamic>? raw;
+      if (json is List) {
+        raw = json;
+      } else if (json is Map) {
+        for (final key in ['trips', 'trip_data', 'data']) {
+          final value = json[key];
+          if (value is List) {
+            raw = value;
+            break;
+          }
+        }
+      }
+      if (raw != null) {
+        final tripMap = raw
+            .whereType<Map<String, dynamic>>()
+            .map((e) => TripSummary.fromJson(e))
+            .toList();
+
+        _tripList = [...tripMap]..sort((a, b) => b.tripId.compareTo(a.tripId));
+      } else {
+        debugPrint('Unexpected trip list response: $json');
+        _tripList = [];
+      }
+    } catch (e) {
+      debugPrint('Failed to fetch trip list: $e');
+      _tripList = [];
+    } finally {
+      _notifyAsync();
+    }
+  }
+
+  void upsertTripSummary(TripSummary trip) {
+    final existingIndex =
+        _tripList.indexWhere((element) => element.tripId == trip.tripId);
+    if (existingIndex >= 0) {
+      _tripList[existingIndex] = trip;
+    } else {
+      _tripList = [trip, ..._tripList];
+    }
+    _tripList.sort((a, b) => b.tripId.compareTo(a.tripId));
+    _notifyAsync();
+  }
+}