frontend groundwork

frontend/lib/utils/fetch_trip.dart

@@ -0,0 +1,45 @@
+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,
+      connectTimeout: const Duration(seconds: 5),
+      receiveTimeout: const Duration(seconds: 60),
+      // api is notoriously slow
+      // headers: {
+      //   HttpHeaders.userAgentHeader: 'dio',
+      //   'api': '1.0.0',
+      // },
+      contentType: Headers.jsonContentType,
+      responseType: ResponseType.json,
+  ),
+);
+
+Future<Trip> fetchTrip(
+  List<double> startPoint,
+  UserPreferences preferences,
+) async {
+  final response = await dio.post(
+    "/trip/new",
+    data: {
+      // 'preferences': preferences.toJson(),
+      'start': [48,2.3]
+    }
+  );
+
+  // handle errors
+  if (response.statusCode != 200) {
+    throw Exception('Failed to load trip');
+  }
+  if (response.data["error"] != null) {
+    throw Exception(response.data["error"]);
+  }
+  return Trip.fromJson(response.data);
+}
+