bare implementation of comuncation with the api

frontend/lib/utils/fetch_trip.dart

@@ -1,16 +1,19 @@
+import "dart:convert";
+import "dart:developer";
+
 import 'package:dio/dio.dart';
 import 'package:anyway/constants.dart';
 import "package:anyway/structs/landmark.dart";
 import "package:anyway/structs/trip.dart";
 import "package:anyway/structs/preferences.dart";
 
-import "package:anyway/structs/linked_landmarks.dart";
 
 Dio dio = Dio(
     BaseOptions(
       baseUrl: API_URL_BASE,
+      // baseUrl: 'http://localhost:8000',
       connectTimeout: const Duration(seconds: 5),
-      receiveTimeout: const Duration(seconds: 60),
+      receiveTimeout: const Duration(seconds: 120),
       // api is notoriously slow
       // headers: {
       //   HttpHeaders.userAgentHeader: 'dio',
@@ -18,19 +21,25 @@ Dio dio = Dio(
       // },
       contentType: Headers.jsonContentType,
       responseType: ResponseType.json,
+        
   ),
 );
 
-Future<Trip> fetchTrip(
+Future<Trip>? fetchTrip(
   List<double> startPoint,
-  UserPreferences preferences,
+  Future<UserPreferences> preferences,
 ) async {
+  UserPreferences prefs = await preferences;
+  Map<String, dynamic> data = {
+    "preferences": prefs.toJson(),
+    "start": startPoint
+  };
+  String dataString = jsonEncode(data);
+  log(dataString);
+
   final response = await dio.post(
     "/trip/new",
-    data: {
-      'preferences': preferences.toJson(),
-      'start': startPoint
-    }
+    data: data
   );
 
   // handle errors
@@ -40,6 +49,37 @@ Future<Trip> fetchTrip(
   if (response.data["error"] != null) {
     throw Exception(response.data["error"]);
   }
-  return Trip.fromJson(response.data);
+  log(response.data.toString());
+  Map<String, dynamic> json = response.data;
+
+  // only fetch the trip "meta" data for now
+  Trip trip = Trip.fromJson(json);
+
+  String? nextUUID = json["first_landmark_uuid"];
+  while (nextUUID != null) {
+    var (landmark, newUUID) = await fetchLandmark(nextUUID);
+    trip.landmarks.add(landmark);
+    nextUUID = newUUID;
+  }
+  return trip;
 }
 
+
+
+Future<(Landmark, String?)> fetchLandmark(String uuid) async {
+  final response = await dio.get(
+    "/landmark/$uuid"
+  );
+
+  // handle errors
+  if (response.statusCode != 200) {
+    throw Exception('Failed to load landmark');
+  }
+  if (response.data["error"] != null) {
+    throw Exception(response.data["error"]);
+  }
+  log(response.data.toString());
+  Map<String, dynamic> json = response.data;
+  String? nextUUID = json["next_uuid"];
+  return (Landmark.fromJson(json), nextUUID);
+}