better errorhandling, slimmed down optimizer

frontend/lib/modules/greeter.dart

@@ -1,3 +1,5 @@
+import 'dart:developer';
+
 import 'package:anyway/structs/trip.dart';
 import 'package:auto_size_text/auto_size_text.dart';
 
@@ -15,12 +17,15 @@ class Greeter extends StatefulWidget {
 }
 
 
-
 class _GreeterState extends State<Greeter> {
+  
   Widget greeterBuilder (BuildContext context, Widget? child) {
     ThemeData theme = Theme.of(context);
+    TextStyle greeterStyle = TextStyle(color: theme.primaryColor, fontWeight: FontWeight.bold, fontSize: 24);
+
     Widget topGreeter;
-    if (widget.trip.landmarks.length > 1) {
+
+    if (widget.trip.uuid != 'pending') {
       topGreeter = FutureBuilder(
         future: widget.trip.cityName,
         builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
@@ -28,17 +33,20 @@ class _GreeterState extends State<Greeter> {
             return AutoSizeText(
               maxLines: 1,
               'Welcome to ${snapshot.data}!',
-              style: TextStyle(color: theme.primaryColor, fontWeight: FontWeight.bold, fontSize: 24),
+              style: greeterStyle
             );
           } else if (snapshot.hasError) {
-            return const AutoSizeText(
+            log('Error while fetching city name');
+            return AutoSizeText(
               maxLines: 1,
-              'Welcome to your trip!'
+              'Welcome to your trip!',
+              style: greeterStyle
             );
           } else {
-            return const AutoSizeText(
+            return AutoSizeText(
               maxLines: 1,
-              'Welcome to ...'
+              'Welcome to ...',
+              style: greeterStyle
             );
           }
         }
@@ -54,14 +62,24 @@ class _GreeterState extends State<Greeter> {
             future: widget.trip.cityName,
             builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
               if (snapshot.hasData) {
-                return Text(
+                return AutoSizeText(
+                  maxLines: 1,
                   'Generating your trip to ${snapshot.data}...',
-                  style: TextStyle(color: theme.primaryColor, fontWeight: FontWeight.bold, fontSize: 24),
+                  style: greeterStyle
                 );
               } else if (snapshot.hasError) {
-                return const Text('Error while fetching city name');
+                // the exact error is shown in the central part of the trip overview. No need to show it here
+                return AutoSizeText(
+                  maxLines: 1,
+                  'Error while loading trip.',
+                  style: greeterStyle
+                  );
               }
-              return const Text('Generating your trip...');
+              return AutoSizeText(
+                  maxLines: 1,
+                  'Generating your trip...',
+                  style: greeterStyle
+                  );
             }
           ),
           Padding(

frontend/lib/modules/landmarks_overview.dart

@@ -1,4 +1,3 @@
-import 'dart:collection';
 import 'dart:developer';
 import 'package:flutter/material.dart';
 import 'package:shared_preferences/shared_preferences.dart';
@@ -19,32 +18,19 @@ class LandmarksOverview extends StatefulWidget {
 }
 
 class _LandmarksOverviewState extends State<LandmarksOverview> {
-  // final Future<List<Landmark>> _landmarks = fetchLandmarks();
 
   @override
   Widget build(BuildContext context) {
-    return ListenableBuilder(//<LinkedList<Landmark>>
+    return ListenableBuilder(
       listenable: widget.trip!,
       builder: (BuildContext context, Widget? child) {
         Trip trip = widget.trip!;
         log("Trip ${trip.uuid} ${trip.landmarks.length} landmarks");
+        
         List<Widget> children;
-        if (trip.uuid == 'pending') {
-          // the trip is still being fetched from the api
-          children = [Center(child: CircularProgressIndicator())];
-        } else if (trip.uuid == 'error') {
-            children = [
-              const Icon(
-                Icons.error_outline,
-                color: Colors.red,
-                size: 60,
-              ),
-              Padding(
-                padding: const EdgeInsets.only(top: 16),
-                child: Text('Error: ${trip.cityName}'),
-              ),
-            ];
-        } else {
+        
+        if (trip.uuid != 'pending' && trip.uuid != 'error') {
+          log("Trip ${trip.uuid} ${trip.landmarks.length} landmarks");
           if (trip.landmarks.length <= 1) {
             children = [
               const Text("No landmarks in this trip"),
@@ -55,7 +41,26 @@ class _LandmarksOverviewState extends State<LandmarksOverview> {
               saveButton(),
             ];
           }
+        } else if(trip.uuid == 'pending') {
+          // the trip is still being fetched from the api
+          children = [Center(child: CircularProgressIndicator())];
+        } else {
+            // trip.uuid == 'error'
+            // show the error raised by the api
+            // String error = 
+            children = [
+              const Icon(
+                Icons.error_outline,
+                color: Colors.red,
+                size: 60,
+              ),
+              Padding(
+                padding: const EdgeInsets.only(top: 16),
+                child: Text('Error: ${trip.errorDescription}'),
+              ),
+            ];
         }
+
         return Column(
           children: children,
         );
@@ -119,11 +124,6 @@ class _LandmarksOverviewState extends State<LandmarksOverview> {
 
 
 Widget stepBetweenLandmarks(Landmark current, Landmark next) {
-  // This is a simple widget that draws a line between landmark-cards
-  // It's a vertical dotted line
-  // Next to the line is the icon for the mode of transport (walking for now) and the estimated time
-  // There is also a button to open the navigation instructions as a new intent
-  // next landmark is not actually required, but it ensures that the widget is deleted when the next landmark is removed (which makes sense, because then there will be another step)
   int timeRounded = 5 * (current.tripTime?.inMinutes ?? 0) ~/ 5;
   // ~/ is integer division (rounding)
   return Container(