Add display of legs and top traction, adjust colour based on device theme

lib/objects/objects.dart

@@ -84,8 +84,9 @@ class YearlyMileage {
 class LocoSummary {
   final String locoType, locoClass, locoNumber, locoName, locoOperator;
   final String? locoNotes, locoEvn;
-  final int locoId, locoJourneys;
-  final double locoMileage;
+  final int locoId;
+  final int? locoJourneys;
+  final double? locoMileage;
 
   LocoSummary({
     required this.locoType,
@@ -96,8 +97,8 @@ class LocoSummary {
     this.locoNotes,
     this.locoEvn,
     required this.locoId,
-    required this.locoMileage,
-    required this.locoJourneys,
+    this.locoMileage,
+    this.locoJourneys,
   });
 
   factory LocoSummary.fromJson(Map<String, dynamic> json) => LocoSummary(
@@ -151,3 +152,76 @@ class TripSummary {
     tripMileage: (json['trip_mileage'] as num).toDouble(),
   );
 }
+
+class Loco {
+  final int id;
+  final String type, number, name, locoClass, operator;
+  final String? notes, evn;
+
+  Loco({
+    required this.id,
+    required this.type,
+    required this.number,
+    required this.name,
+    required this.locoClass,
+    required this.operator,
+    this.notes,
+    this.evn,
+  });
+
+  factory Loco.fromJson(Map<String, dynamic> json) => Loco(
+    id: json['loco_id'],
+    type: json['loco_type'],
+    number: json['loco_number'],
+    name: json['loco_name'] ?? "",
+    locoClass: json['loco_class'],
+    operator: json['loco_operator'],
+    notes: json['loco_notes'],
+    evn: json['loco_evn'],
+  );
+}
+
+class Leg {
+  final int id, tripId, timezone, driving;
+  final String start, end, route, network, notes, headcode, user;
+  final DateTime beginTime;
+  final double mileage;
+  final List<Loco> locos;
+
+  Leg({
+    required this.id,
+    required this.tripId,
+    required this.start,
+    required this.end,
+    required this.beginTime,
+    required this.timezone,
+    required this.network,
+    required this.route,
+    required this.mileage,
+    required this.notes,
+    required this.headcode,
+    required this.driving,
+    required this.user,
+    required this.locos,
+  });
+
+  factory Leg.fromJson(Map<String, dynamic> json) => Leg(
+    id: json['leg_id'],
+    tripId: json['leg_trip'] ?? 0,
+    start: json['leg_start'],
+    end: json['leg_end'],
+    beginTime: DateTime.parse(json['leg_begin_time']),
+    timezone: (json['leg_timezone'] as num).toInt(),
+    network: json['leg_network'] ?? "",
+    route: json['leg_route'],
+    mileage: (json['leg_mileage'] as num).toDouble(),
+    notes: json['leg_notes'] ?? "",
+    headcode: json['leg_headcode'] ?? "",
+    driving: json['leg_driving'],
+    user: json['leg_user'],
+    locos: (json['locos'] as List)
+        .map((e) => Loco.fromJson(e as Map<String, dynamic>))
+        .toList(),
+  );
+}
+