simple detail view of flood station and readings

lib/services/api.dart

@@ -2,6 +2,7 @@ import 'package:http/http.dart' as http;
 import 'dart:convert';
 
 import '../model/flood_station.dart';
+import '../model/reading.dart';
 
 class Api {
   static const String _rootUrl =
@@ -18,4 +19,20 @@ class Api {
     }
     return stations;
   }
+
+  static Future<List<Reading>> fetchReadingsFromStation(
+      String stationId) async {
+    List<Reading> readings = [];
+    final dateTime = DateTime.now().subtract(Duration(days: 1));
+    final url =
+        '$_rootUrl/id/stations/$stationId/readings?since=${dateTime.toIso8601String()}';
+    final response = await http.get(Uri.parse(url));
+    if (response.statusCode == 200) {
+      final Map<String, dynamic> jsonStr = jsonDecode(response.body);
+      for (final str in jsonStr['items']) {
+        readings.add(Reading.fromMap(str));
+      }
+    }
+    return readings;
+  }
 }