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 =
      'https://environment.data.gov.uk/flood-monitoring';

  static Future<List<FloodStation>> fetchStations() async {
    List<FloodStation> stations = [];
    final response = await http.get(Uri.parse('$_rootUrl/id/stations'));
    if (response.statusCode == 200) {
      final Map<String, dynamic> jsonStr = jsonDecode(response.body);
      for (final str in jsonStr['items']) {
        stations.add(FloodStation.fromMap(str));
      }
    }
    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()}Z&_sorted';
    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.reversed.toList();
  }
}