functional datastructure. Needs to be able to write to storage as well

frontend/lib/modules/greeter.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
 
-Widget Greeter (ThemeData theme, {bool full = false}) {
+Widget Greeter(ThemeData theme, {bool full = false}) {
   String greeterText = "";
   try {
     String cityName = getCityName();

frontend/lib/modules/landmark_card.dart

@@ -32,7 +32,9 @@ class _LandmarkCardState extends State<LandmarkCard> {
               // force a fixed width
               width: 160,
               child: Image.network(
-                widget.landmark.imageURL,
+                widget.landmark.imageURL!,
+                errorBuilder: (context, error, stackTrace) => Icon(Icons.question_mark_outlined),
+                // TODO: make this a switch statement to load a placeholder if null
                 // cover the whole container meaning the image will be cropped
                 fit: BoxFit.cover,
               ),

frontend/lib/modules/landmarks_overview.dart

@@ -1,29 +1,34 @@
+import 'dart:collection';
+
 import 'package:fast_network_navigation/modules/landmark_card.dart';
 import 'package:fast_network_navigation/structs/landmark.dart';
-import 'package:fast_network_navigation/utils/get_landmarks.dart';
+
+import 'package:fast_network_navigation/structs/trip.dart';
 import 'package:flutter/material.dart';
 
 
 
 
-class loadLandmarksOverview extends StatefulWidget {
-  const loadLandmarksOverview({super.key});
+class LandmarksOverview extends StatefulWidget {
+  final Future<Trip>? trip;
+  const LandmarksOverview({super.key, this.trip});
 
   @override
-  State<loadLandmarksOverview> createState() => _loadLandmarksOverviewState();
+  State<LandmarksOverview> createState() => _LandmarksOverviewState();
 }
 
-class _loadLandmarksOverviewState extends State<loadLandmarksOverview> {
-  final Future<List<Landmark>> _landmarks = fetchLandmarks();
+class _LandmarksOverviewState extends State<LandmarksOverview> {
+  // final Future<List<Landmark>> _landmarks = fetchLandmarks();
 
   @override
   Widget build(BuildContext context) {
+    final Future<LinkedList<Landmark>> _landmarks = getLandmarks(widget.trip);
     return DefaultTextStyle(
       style: Theme.of(context).textTheme.displayMedium!,
       textAlign: TextAlign.center,
-      child: FutureBuilder<List<Landmark>>(
+      child: FutureBuilder<LinkedList<Landmark>>(
         future: _landmarks,
-        builder: (BuildContext context, AsyncSnapshot<List<Landmark>> snapshot) {
+        builder: (BuildContext context, AsyncSnapshot<LinkedList<Landmark>> snapshot) {
           List<Widget> children;
           if (snapshot.hasData) {
             children = [landmarksWithSteps(snapshot.data!)];
@@ -42,13 +47,10 @@ class _loadLandmarksOverviewState extends State<loadLandmarksOverview> {
           } else {
             children = [Center(child: CircularProgressIndicator())];
           }
-          return Padding(
-            padding: const EdgeInsets.all(10),
-            child: Center(
-              child: Column(
-                mainAxisAlignment: MainAxisAlignment.center,
-                children: children,
-              ),
+          return Center(
+            child: Column(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: children,
             ),
           );
         },
@@ -57,12 +59,12 @@ class _loadLandmarksOverviewState extends State<loadLandmarksOverview> {
   }
 }
 
-Widget landmarksWithSteps(List<Landmark> landmarks) {
+Widget landmarksWithSteps(LinkedList<Landmark> landmarks) {
   List<Widget> children = [];
-  for (int i = 0; i < landmarks.length; i++) {
-    children.add(LandmarkCard(landmarks[i]));
-    if (i < landmarks.length - 1) {
-      Widget step = stepBetweenLandmarks(landmarks[i], landmarks[i + 1]);
+  for (Landmark landmark in landmarks) {
+    children.add(LandmarkCard(landmark));
+    if (landmark.next != null) {
+      Widget step = stepBetweenLandmarks(landmark, landmark.next!);
       children.add(step);
     }
   }
@@ -109,4 +111,9 @@ Widget stepBetweenLandmarks(Landmark before, Landmark after) {
       ],
     ),
   );
-}
+}
+
+Future<LinkedList<Landmark>> getLandmarks (Future<Trip>? trip) async {
+  Trip tripf = await trip!;
+  return tripf.landmarks;
+}

frontend/lib/modules/map.dart

@@ -1,9 +1,18 @@
+import 'dart:collection';
+
 import 'package:fast_network_navigation/structs/landmark.dart';
-import 'package:fast_network_navigation/utils/get_landmarks.dart';
+import 'package:fast_network_navigation/structs/trip.dart';
 import 'package:flutter/material.dart';
 import 'package:google_maps_flutter/google_maps_flutter.dart';
 
 class MapWidget extends StatefulWidget {
+
+  final Future<Trip>? trip;
+
+  MapWidget({
+    this.trip
+  });
+
   @override
   State<MapWidget> createState() => _MapWidgetState();
 }
@@ -31,7 +40,8 @@ class _MapWidgetState extends State<MapWidget> {
 
   void drawLandmarks() async {
     // (re)draws landmarks on the map
-    List<Landmark> landmarks = await fetchLandmarks();
+    Trip? trip = await widget.trip;
+    LinkedList<Landmark> landmarks = trip!.landmarks;
     setState(() {
       for (Landmark landmark in landmarks) {
         markers.add(Marker(
@@ -55,4 +65,3 @@ class _MapWidgetState extends State<MapWidget> {
     );
   }
 }
-

frontend/lib/modules/trips_overview.dart

@@ -2,19 +2,21 @@ import 'package:flutter/material.dart';
 
 import 'package:fast_network_navigation/layout.dart';
 import 'package:fast_network_navigation/structs/trip.dart';
-import 'package:fast_network_navigation/utils/get_trips.dart';
 
 
 class TripsOverview extends StatefulWidget {
-  
-  const TripsOverview({super.key});
+  final Future<List<Trip>> trips;
+  const TripsOverview({
+    super.key,
+    required this.trips,
+    });
 
   @override
   State<TripsOverview> createState() => _TripsOverviewState();
 }
 
 class _TripsOverviewState extends State<TripsOverview> {
-  final Future<List<Trip>> _trips = loadTrips();
+  // final Future<List<Trip>> _trips = loadTrips();
 
 
   Widget listBuild (BuildContext context, AsyncSnapshot<List<Trip>> snapshot) {
@@ -23,12 +25,12 @@ class _TripsOverviewState extends State<TripsOverview> {
       children = List<Widget>.generate(snapshot.data!.length, (index) {
         Trip trip = snapshot.data![index];
         return ListTile(
-          title: Text("Trip to ${trip.cityName} (${trip.landmarks.length} stops)"),
+          title: Text("Trip to ${trip.cityName}"),
           leading: Icon(Icons.pin_drop),
           onTap: () {
             Navigator.of(context).push(
               MaterialPageRoute(
-                builder: (context) => BasePage(mainScreen: "map") //, trip: trip)
+                builder: (context) => BasePage(mainScreen: "map", trip: trip)
               )
             );
           },
@@ -58,7 +60,7 @@ class _TripsOverviewState extends State<TripsOverview> {
   @override
   Widget build(BuildContext context) {
     return FutureBuilder(
-      future: _trips,
+      future: widget.trips,
       builder: listBuild,
     );
   }