add support for network calculation from the calculator

lib/objects/objects.dart

@@ -517,6 +517,7 @@ class StatsAbout {
     final mileageByYear = <int, double>{};
     final classByYear = <int, List<StatsClassMileage>>{};
     final networkByYear = <int, List<StatsNetworkMileage>>{};
+    final countryByYear = <int, List<StatsCountryMileage>>{};
     final stationByYear = <int, List<StatsStationVisits>>{};
     final winnersByYear = <int, int>{};
     final winnerTypeCountsByYear = <int, Map<String, int>>{};
@@ -577,6 +578,17 @@ class StatsAbout {
       return const [];
     }
 
+    List<StatsCountryMileage> parseCountryList(dynamic value) {
+      if (value is List) {
+        return value
+            .whereType<Map>()
+            .map((e) => StatsCountryMileage.fromJson(
+                e.map((key, value) => MapEntry(key.toString(), value))))
+            .toList();
+      }
+      return const [];
+    }
+
     void parseYearMap<T>(
       dynamic source,
       Map<int, T> target,
@@ -611,6 +623,11 @@ class StatsAbout {
       networkByYear,
       parseNetworkList,
     );
+    parseYearMap<List<StatsCountryMileage>>(
+      json['top_countries'],
+      countryByYear,
+      parseCountryList,
+    );
     parseYearMap<List<StatsStationVisits>>(
       json['top_stations'],
       stationByYear,
@@ -643,6 +660,7 @@ class StatsAbout {
       ...mileageByYear.keys,
       ...classByYear.keys,
       ...networkByYear.keys,
+      ...countryByYear.keys,
       ...stationByYear.keys,
       ...winnersByYear.keys,
       ...winnerTypeCountsByYear.keys,
@@ -656,6 +674,7 @@ class StatsAbout {
         mileage: mileageByYear[year] ?? 0,
         topClasses: classByYear[year] ?? const [],
         topNetworks: networkByYear[year] ?? const [],
+        topCountries: countryByYear[year] ?? const [],
         topStations: stationByYear[year] ?? const [],
         winnerCount: winnersByYear[year] ?? 0,
         winnerTypeCounts: winnerTypeCountsByYear[year] ?? const {},
@@ -678,6 +697,7 @@ class StatsYear {
   final double mileage;
   final List<StatsClassMileage> topClasses;
   final List<StatsNetworkMileage> topNetworks;
+  final List<StatsCountryMileage> topCountries;
   final List<StatsStationVisits> topStations;
   final int winnerCount;
   final Map<String, int> winnerTypeCounts;
@@ -688,6 +708,7 @@ class StatsYear {
     required this.mileage,
     required this.topClasses,
     required this.topNetworks,
+    required this.topCountries,
     required this.topStations,
     required this.winnerCount,
     required this.winnerTypeCounts,
@@ -727,6 +748,22 @@ class StatsNetworkMileage {
       );
 }
 
+class StatsCountryMileage {
+  final String country;
+  final double mileage;
+
+  StatsCountryMileage({
+    required this.country,
+    required this.mileage,
+  });
+
+  factory StatsCountryMileage.fromJson(Map<String, dynamic> json) =>
+      StatsCountryMileage(
+        country: _asString(json['country'], 'Unknown'),
+        mileage: _asDouble(json['mileage']),
+      );
+}
+
 class StatsStationVisits {
   final String station;
   final int visits;
@@ -1205,6 +1242,8 @@ class Leg {
   final String start, end, network, notes, headcode, user;
   final String origin, destination;
   final List<String> route;
+  final List<NetworkMileage> networkMileage;
+  final List<CountryMileage> countryMileage;
   final String? legShareId;
   final LegShareMeta? sharedFrom;
   final List<LegShareMeta> sharedTo;
@@ -1231,6 +1270,8 @@ class Leg {
     required this.driving,
     required this.user,
     required this.locos,
+    this.networkMileage = const [],
+    this.countryMileage = const [],
     this.endTime,
     this.originTime,
     this.destinationTime,
@@ -1300,6 +1341,14 @@ class Leg {
           : _asInt(json['leg_end_delay']),
       origin: _asString(json['leg_origin']),
       destination: _asString(json['leg_destination']),
+      networkMileage: (json['network_mileage'] as List? ?? const [])
+          .whereType<Map>()
+          .map((e) => NetworkMileage.fromJson(Map<String, dynamic>.from(e)))
+          .toList(),
+      countryMileage: (json['country_mileage'] as List? ?? const [])
+          .whereType<Map>()
+          .map((e) => CountryMileage.fromJson(Map<String, dynamic>.from(e)))
+          .toList(),
       legShareId: _asString(json['leg_share_id']),
       sharedFrom: sharedFrom,
       sharedTo: sharedTo,
@@ -1470,12 +1519,16 @@ class RouteResult {
   final List<String> calculatedRoute;
   final List<double> costs;
   final double distance;
+  final List<NetworkMileage> networkMileage;
+  final List<CountryMileage> countryMileage;
 
   RouteResult({
     required this.inputRoute,
     required this.calculatedRoute,
     required this.costs,
     required this.distance,
+    this.networkMileage = const [],
+    this.countryMileage = const [],
   });
 
   factory RouteResult.fromJson(Map<String, dynamic> json) {
@@ -1484,10 +1537,50 @@ class RouteResult {
       calculatedRoute: List<String>.from(json['calculated_route']),
       costs: (json['costs'] as List).map((e) => (e as num).toDouble()).toList(),
       distance: (json['distance'] as num).toDouble(),
+      networkMileage: (json['network_mileage'] as List? ?? const [])
+          .whereType<Map>()
+          .map((e) => NetworkMileage.fromJson(Map<String, dynamic>.from(e)))
+          .toList(),
+      countryMileage: (json['country_mileage'] as List? ?? const [])
+          .whereType<Map>()
+          .map((e) => CountryMileage.fromJson(Map<String, dynamic>.from(e)))
+          .toList(),
     );
   }
 }
 
+class NetworkMileage {
+  final String network;
+  final double miles;
+
+  NetworkMileage({
+    required this.network,
+    required this.miles,
+  });
+
+  factory NetworkMileage.fromJson(Map<String, dynamic> json) =>
+      NetworkMileage(
+        network: _asString(json['network']),
+        miles: _asDouble(json['miles']),
+      );
+}
+
+class CountryMileage {
+  final String country;
+  final double miles;
+
+  CountryMileage({
+    required this.country,
+    required this.miles,
+  });
+
+  factory CountryMileage.fromJson(Map<String, dynamic> json) =>
+      CountryMileage(
+        country: _asString(json['country']),
+        miles: _asDouble(json['miles']),
+      );
+}
+
 class Station {
   final int id;
   final String name;