update: json data parsing

app/lib/pages_and_widgets/default_page.dart

@@ -17,24 +17,29 @@ class DefaultPage extends StatefulWidget {
 class _DefaultPageState extends State<DefaultPage> {
   late Timer _timer;
 
-  List<MarkerData> markerList = [];
+  List<MarkerTemplate> markerList = [];
 
-  // fetchMarkerData requests data from the update_map endpoint
-  Future<void> fetchMarkerData() async {
+  // fetchMarkerTemplate requests data from the update_map endpoint
+  Future<void> fetchMarkerTemplate() async {
     try {
       // Custom HTTP client
       HttpClient client = HttpClient()
         ..badCertificateCallback = // NB: temporary disable SSL certificate validation
             (X509Certificate cert, String host, int port) => true;
 
+      // Request makers from API and wait for response
       var request =  await client.getUrl(Uri.parse(serverURI+mapEndpoint));
       var response = await request.close();
 
-      // Parse json response to list of MarkerData objects if request is ok
+      // Attempt to parse json if request is ok
       if (response.statusCode == 200) {
         var responseBody = await response.transform(utf8.decoder).join();
         setState(() {
-          markerList = parseMarkerData(responseBody);
+          // Parse JSON string from response body
+          List<dynamic> jsonData = json.decode(responseBody);
+
+          // Convert response from type List<dynamic> to List<MarkerTemplate>
+          markerList = jsonData.map((data) => MarkerTemplate.fromJson(data)).toList();
         });
       } else {
         print('Request failed with status: ${response.statusCode}');
@@ -44,17 +49,17 @@ class _DefaultPageState extends State<DefaultPage> {
     }
   }
 
-  // Timer initializer
+  // State initializer
   @override
   void initState() {
     super.initState();
-    // Call fetchMarkerData when the widget is first created
-    fetchMarkerData();
+    // Call fetchMarkerTemplate when the widget is first created
+    fetchMarkerTemplate();
 
-    // Schedule fetchMarkerData to run periodically based on fetchInterval const
+    // Schedule fetchMarkerTemplate to run periodically based on fetchInterval const
     const Duration fiveMinutes = Duration(minutes: fetchInterval);
     _timer = Timer.periodic(fiveMinutes, (timer) {
-      fetchMarkerData();
+      fetchMarkerTemplate();
     });
   }
 
@@ -99,11 +104,11 @@ class _DefaultPageState extends State<DefaultPage> {
                     ),
                     MarkerLayer(
                       // Dynamically allocate markers based on a list
-                      markers: markerList.map((MarkerData markerData) {
+                      markers: markerList.map((MarkerTemplate MarkerTemplate) {
                         return Marker(
-                          width: markerData.size,
-                          height: markerData.size,
-                          point: markerData.location,
+                          width: MarkerTemplate.size,
+                          height: MarkerTemplate.size,
+                          point: MarkerTemplate.location,
                           builder: (ctx) => GestureDetector(
                             onTap: () {
                               // NB: temporary print
@@ -112,9 +117,9 @@ class _DefaultPageState extends State<DefaultPage> {
                             },
                             child: Image.asset(
                               'assets/icons/circle-red.png', // Path to your custom icon asset
-                              color: markerData.color,
-                              width: markerData.radius,
-                              height: markerData.radius,
+                              color: MarkerTemplate.color,
+                              width: MarkerTemplate.size,
+                              height: MarkerTemplate.size,
                             ),
                           ),
                         );

app/lib/pages_and_widgets/marker_data.dart

 import 'package:flutter/material.dart';
 import 'package:latlong2/latlong.dart';
-import 'dart:convert';
 
-// MarkerData holds data for the dynamically allocated markers
-class MarkerData {
-  final LatLng location;
-  final double size;
-  final Color color;
-  final double radius;
+// Sensor holds data about a single sensor
+class Sensor {
+  int id;
+  String type;
+  bool active;
 
-  MarkerData({required this.location, required this.size, required this.color, required this.radius});
+  Sensor({required this.id, required this.type, required this.active});
+
+  factory Sensor.fromJson(Map<String, dynamic> json) {
+    return Sensor(
+      id: json['ID'],
+      type: json['type'],
+      active: json['active'],
+    );
+  }
 }
 
-// parseMarkerData parses jsonData into an object of type MakerData
-List<MarkerData> parseMarkerData(String jsonString) {
-  final parsed = json.decode(jsonString);
-  return List<MarkerData>.from(parsed.map((data) => MarkerData(
-    location: LatLng(data['latitude'], data['longitude']),
-    size: data['size'].toDouble(),
-    color: parseColor(data['color']),
-    radius: data['radius'].toDouble(),
-  )));
+// DateAndTime holds the date and time for a single measurement
+class DateAndTime {
+  int year;
+  int month;
+  int day;
+  int hour;
+  int minute;
+
+  DateAndTime({
+    required this.year,
+    required this.month,
+    required this.day,
+    required this.hour,
+    required this.minute,
+  });
+
+  factory DateAndTime.fromJson(Map<String, dynamic> json) {
+    return DateAndTime(
+      year: json['year'],
+      month: json['month'],
+      day: json['day'],
+      hour: json['hour'],
+      minute: json['minute'],
+    );
+  }
 }
 
-// parseColor parses the color strings into Colors types
-Color parseColor(String colorString) {
-  switch (colorString) {
-    case 'blue':
-      return Colors.blue;
-    case 'red':
-      return Colors.red;
-    case 'green':
-      return Colors.green;
-    default:
-      return Colors.black; // Default color if unrecognized
+// Measurement holds data related to a singular measurement taken
+// at a given time
+class Measurement {
+  double longitude;
+  double latitude;
+  DateAndTime datetime;
+  Sensor sensor;
+  double precipitation;
+  double thickness;
+  double maxWeight;
+  double safetyLevel;
+  double accuracy;
+
+  Measurement({
+    required this.longitude,
+    required this.latitude,
+    required this.datetime,
+    required this.sensor,
+    required this.precipitation,
+    required this.thickness,
+    required this.maxWeight,
+    required this.safetyLevel,
+    required this.accuracy,
+  });
+
+  factory Measurement.fromJson(Map<String, dynamic> json) {
+    return Measurement(
+      longitude: json['longitude'],
+      latitude: json['latitude'],
+      datetime: DateAndTime.fromJson(json['datetime']),
+      sensor: Sensor.fromJson(json['sensor']),
+      precipitation: json['precipitation'],
+      thickness: json['thickness'],
+      maxWeight: json['max_weight'],
+      safetyLevel: json['safety_level'],
+      accuracy: json['accuracy'],
+    );
   }
-}
\ No newline at end of file
+}
+
+// MarkerTemplate holds all data required for rendering a marker
+class MarkerTemplate {
+  Measurement geoData;
+  LatLng location;
+  double size;
+  Color color;
+
+  MarkerTemplate({
+    required this.geoData,
+    required this.location,
+    required this.size,
+    required this.color
+  });
+
+  factory MarkerTemplate.fromJson(Map<String, dynamic> json) {
+    // Parse from JSON string to type Color
+    Color parsedColor = parseColor(json['color']);
+
+      return MarkerTemplate(
+        geoData: Measurement.fromJson(json['geo_data']),
+        location: LatLng(json['latitude'], json['longitude']),
+        size: json['size'],
+        color: parsedColor,
+      );
+    }
+
+    // parseColor parses the color strings into Colors types
+    static Color parseColor(String colorString) {
+      switch (colorString) {
+        case 'yellow':
+          return Colors.yellow;
+        case 'red':
+          return Colors.red;
+        case 'green':
+          return Colors.green;
+        default:
+          return Colors.black; // Default color if unrecognized
+      }
+    }
+}

server/map/get_markers.py

@@ -26,9 +26,9 @@ def get_markers():
                                    precipitation=0.0, thickness=0.0, max_weight=0.0, safety_level=0.0, accuracy=4.0)
     
         testData = [
-            MarkerTemplate(measurement1, 30.0-measurement1.accuracy, "Green"),
-            MarkerTemplate(measurement2, 10.0-measurement2.accuracy, "Red"),
-            MarkerTemplate(measurement3, 20.0-measurement3.accuracy, "Yellow"),
+            MarkerTemplate(measurement1, 30.0-measurement1.accuracy, "green"),
+            MarkerTemplate(measurement2, 10.0-measurement2.accuracy, "red"),
+            MarkerTemplate(measurement3, 20.0-measurement3.accuracy, "yellow"),
         ]
         
         # NB: return test data as JSON