import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:wetter/models/daily_weather_model.dart';

class BrightSkyAPI {
  static Future<DailyWeatherModel> fetchForecastOfSingleDay(
      DateTime d, double lat, double lon) async {
    String dt = "${d.year}-${d.month}-${d.day}";
    final response = await http.get(
        Uri.parse(
            'https://api.brightsky.dev/weather?lat=$lat&lon=$lon&date=$dt&tz=Europe/Berlin'),
        headers: {"Accept": "application/json"});
    if (response.statusCode == 200) {
      return DailyWeatherModel.fromJson(jsonDecode(response.body));
    } else {
      throw Exception('Failed to load weather data');
    }
  }

  static Future<List<DailyWeatherModel>> fetchForecastForTimeRange(
      DateTime from, int noOfDays, double lat, double lon) async {
    DateTime until = from.add(Duration(days: noOfDays));
    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=$lat&lon=$lon&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;
  }
}