major refactor

lib/objects/objects.dart

@@ -1,6 +1,31 @@
 import 'package:flutter/material.dart';
 import 'package:intl/intl.dart';
 
+int _asInt(dynamic value, [int fallback = 0]) {
+  if (value is int) return value;
+  if (value is num) return value.toInt();
+  final parsed = int.tryParse(value?.toString() ?? '');
+  return parsed ?? fallback;
+}
+
+double _asDouble(dynamic value, [double fallback = 0]) {
+  if (value is double) return value;
+  if (value is num) return value.toDouble();
+  final parsed = double.tryParse(value?.toString() ?? '');
+  return parsed ?? fallback;
+}
+
+String _asString(dynamic value, [String fallback = '']) {
+  final str = value?.toString();
+  return (str == null) ? fallback : str;
+}
+
+DateTime _asDateTime(dynamic value, [DateTime? fallback]) {
+  if (value is DateTime) return value;
+  final parsed = DateTime.tryParse(value?.toString() ?? '');
+  return parsed ?? (fallback ?? DateTime.fromMillisecondsSinceEpoch(0));
+}
+
 class DestinationObject {
   const DestinationObject(
     this.label,
@@ -92,8 +117,8 @@ class YearlyMileage {
   YearlyMileage({this.year, required this.mileage});
 
   factory YearlyMileage.fromJson(Map<String, dynamic> json) => YearlyMileage(
-    year: json['year'],
-    mileage: (json['mileage'] as num).toDouble(),
+    year: json['year'] is int ? json['year'] as int : int.tryParse('${json['year']}'),
+    mileage: _asDouble(json['mileage']),
   );
 }
 
@@ -341,10 +366,10 @@ class LeaderboardEntry {
 
   factory LeaderboardEntry.fromJson(Map<String, dynamic> json) =>
       LeaderboardEntry(
-        userId: json['user_id'],
-        username: json['username'],
-        userFullName: json['user_full_name'],
-        mileage: (json['mileage'] as num).toDouble(),
+        userId: _asString(json['user_id']),
+        username: _asString(json['username']),
+        userFullName: _asString(json['user_full_name']),
+        mileage: _asDouble(json['mileage']),
       );
 }
 
@@ -360,9 +385,9 @@ class TripSummary {
   });
 
   factory TripSummary.fromJson(Map<String, dynamic> json) => TripSummary(
-    tripId: json['trip_id'],
-    tripName: json['trip_name'],
-    tripMileage: (json['trip_mileage'] as num).toDouble(),
+    tripId: _asInt(json['trip_id']),
+    tripName: _asString(json['trip_name']),
+    tripMileage: _asDouble(json['trip_mileage']),
   );
 }
 
@@ -391,21 +416,22 @@ class Leg {
   });
 
   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>))
+    id: _asInt(json['leg_id']),
+    tripId: _asInt(json['leg_trip']),
+    start: _asString(json['leg_start']),
+    end: _asString(json['leg_end']),
+    beginTime: _asDateTime(json['leg_begin_time']),
+    timezone: _asInt(json['leg_timezone']),
+    network: _asString(json['leg_network']),
+    route: _asString(json['leg_route']),
+    mileage: _asDouble(json['leg_mileage']),
+    notes: _asString(json['leg_notes']),
+    headcode: _asString(json['leg_headcode']),
+    driving: _asInt(json['leg_driving']),
+    user: _asString(json['leg_user']),
+    locos: (json['locos'] is List ? (json['locos'] as List) : const [])
+        .whereType<Map>()
+        .map((e) => Loco.fromJson(Map<String, dynamic>.from(e)))
         .toList(),
   );
 }
@@ -458,10 +484,10 @@ class Station {
   });
 
   factory Station.fromJson(Map<String, dynamic> json) => Station(
-    id: json['id'],
-    name: json['name'],
-    network: json['network'],
-    country: json['country'],
+    id: _asInt(json['id']),
+    name: _asString(json['name']),
+    network: _asString(json['network']),
+    country: _asString(json['country']),
   );
 }