bare implementation of comuncation with the api

frontend/lib/structs/preferences.dart

@@ -82,18 +82,16 @@ class UserPreferences {
     }
   }
 
-  String toJson() {
-    // This is "opinionated" JSON, corresponding to the backend's expectations
-    return '''
-    {
-      "sightseeing": {"type": "sightseeing", "score": ${sightseeing.value}},
-      "shopping": {"type": "shopping", "score": ${shopping.value}},
-      "nature": {"type": "nature", "score": ${nature.value}},
-      "max_time_minutes": ${maxTime.value},
-      "detour_tolerance_minute": ${maxDetour.value}
+  Map<String, dynamic> toJson() {
+      // This is "opinionated" JSON, corresponding to the backend's expectations
+      return {
+        "sightseeing": {"type": "sightseeing", "score": sightseeing.value},
+        "shopping": {"type": "shopping", "score": shopping.value},
+        "nature": {"type": "nature", "score": nature.value},
+        "max_time_minute": maxTime.value,
+        "detour_tolerance_minute": maxDetour.value
+      };
     }
-    ''';
-  }
 }
 
 

frontend/lib/structs/trip.dart

@@ -11,6 +11,7 @@ class Trip {
   final String uuid;
   final String cityName;
   // TODO: cityName should be inferred from coordinates of the Landmarks
+  final int totalTime;
   final LinkedList<Landmark> landmarks;
   // could be empty as well
 
@@ -19,15 +20,18 @@ class Trip {
     required this.uuid,
     required this.cityName,
     required this.landmarks,
+    this.totalTime = 0
   });
 
 
   factory Trip.fromJson(Map<String, dynamic> json) {
-    return Trip(
+    Trip trip = Trip(
       uuid: json['uuid'],
-      cityName: json['city_name'],
+      cityName: json['city_name'] ?? 'Not communicated',
       landmarks: LinkedList()
     );
+
+    return trip;
   }
 
 
@@ -44,7 +48,7 @@ class Trip {
   Map<String, dynamic> toJson() => {
     'uuid': uuid,
     'city_name': cityName,
-    'entry_uuid': landmarks.first?.uuid ?? ''
+    'first_landmark_uuid': landmarks.first.uuid
   };