show more days of forecast, enable reload of forecasts

lib/services/brightsky_api_service.dart

@@ -3,7 +3,7 @@ import 'package:http/http.dart' as http;
 import 'package:wetter/models/daily_weather_model.dart';
 
 class BrightSkyAPI {
-  static Future<DailyWeatherModel> fetchForecast(DateTime d) async {
+  static Future<DailyWeatherModel> fetchForecastOfSingleDay(DateTime d) async {
     String dt = "${d.year}-${d.month}-${d.day}";
     final response = await http.get(
         Uri.parse(
@@ -15,4 +15,38 @@ class BrightSkyAPI {
       throw Exception('Failed to load weather data');
     }
   }
+
+  static Future<List<DailyWeatherModel>> fetchForecastForTimeRange(
+      DateTime from, DateTime until) async {
+    String fromDay = "${from.year}-${from.month}-${from.day}";
+    String untilDay = "${until.year}-${until.month}-${until.day}";
+    final response = await http.get(
+        Uri.parse(
+            'https://api.brightsky.dev/weather?lat=53.43&lon=10&date=$fromDay&last_date=$untilDay&tz=Europe/Berlin'),
+        headers: {"Accept": "application/json"});
+    final Map<String, dynamic> responseAsJson = jsonDecode(response.body);
+    if (response.statusCode == 200) {
+      List<DailyWeatherModel> data = splitRangeToDaily(responseAsJson);
+      return data;
+    } else {
+      throw Exception('Failed to load weather data');
+    }
+  }
+
+  static List<DailyWeatherModel> splitRangeToDaily(Map<String, dynamic> json) {
+    List dataPoints = json['weather'];
+    List<DailyWeatherModel> response = [];
+    Map<String, dynamic> currPoint = {"weather": []};
+    String currDay = dataPoints[0]['timestamp'].substring(0, 10);
+    for (var point in dataPoints) {
+      if (currDay != point['timestamp'].substring(0, 10)) {
+        currDay = point['timestamp'].substring(0, 10);
+        response.add(DailyWeatherModel.fromJson(currPoint));
+        currPoint = {"weather": []};
+      } else {
+        currPoint['weather'].add(point);
+      }
+    }
+    return response;
+  }
 }