import 'dart:convert';

import 'package:flutter_test/flutter_test.dart';
import 'package:http/http.dart' as http;
import 'package:http/testing.dart';

import 'package:dmc_app/domain/waypoint/flat_waypoint_list.dart';
import 'package:dmc_app/services/wind/wind_service.dart';

bool _isPressureRequest(http.Request request) =>
    (request.url.queryParameters['hourly'] ?? '').contains('hPa');

http.Response _json(Object body) =>
    http.Response(jsonEncode(body), 200, headers: {
      'content-type': 'application/json',
    });

void main() {
  group('WindService.fetchHeaderWind', () {
    test('interpoliert auf 120 m AGL ueber dem Referenzort', () async {
      final client = MockClient((request) async {
        if (_isPressureRequest(request)) {
          return http.Response('', 500);
        }
        return _json({
          'elevation': 2.0,
          'hourly': {
            'time': ['2024-06-01T12:00'],
            'wind_speed_10m': [3.0],
            'wind_direction_10m': [190.0],
            'wind_speed_80m': [5.0],
            'wind_direction_80m': [200.0],
            'wind_speed_120m': [6.0],
            'wind_direction_120m': [205.0],
            'wind_speed_180m': [8.0],
            'wind_direction_180m': [210.0],
            'wind_gusts_10m': [7.5],
          },
        });
      });
      final service = WindService(client: client);

      final result = await service.fetchHeaderWind(52.0, 4.0);

      // Ziel 2 + 120 = 122 m AMSL faellt exakt auf den 120-m-Stuetzpunkt.
      expect(result, isNotNull);
      expect(result!.speedMs, closeTo(6.0, 0.001));
      expect(result.dirFromDeg, closeTo(205.0, 0.001));
    });

    test('liefert null, wenn beide Requests fehlschlagen', () async {
      final client = MockClient((request) async => http.Response('', 500));
      final service = WindService(client: client);

      final result = await service.fetchHeaderWind(52.0, 4.0);

      expect(result, isNull);
    });
  });

  group('WindService.fetchWindForWaypoints', () {
    test('interpoliert jeden Wegpunkt an seinem eigenen Ort/seiner eigenen Hoehe',
        () async {
      final client = MockClient((request) async {
        if (_isPressureRequest(request)) {
          return http.Response('', 500);
        }
        return _json([
          {
            'elevation': 2.0,
            'hourly': {
              'time': ['2024-06-01T12:00'],
              'wind_speed_10m': [3.0],
              'wind_direction_10m': [190.0],
              'wind_speed_80m': [5.0],
              'wind_direction_80m': [200.0],
              'wind_speed_120m': [6.0],
              'wind_direction_120m': [205.0],
              'wind_speed_180m': [8.0],
              'wind_direction_180m': [210.0],
              'wind_gusts_10m': [7.5],
            },
          },
          {
            'elevation': 50.0,
            'hourly': {
              'time': ['2024-06-01T12:00'],
              'wind_speed_10m': [1.0],
              'wind_direction_10m': [100.0],
              'wind_speed_80m': [9.0],
              'wind_direction_80m': [250.0],
              'wind_speed_120m': [10.0],
              'wind_direction_120m': [260.0],
              'wind_speed_180m': [11.0],
              'wind_direction_180m': [270.0],
              'wind_gusts_10m': [12.0],
            },
          },
        ]);
      });
      final service = WindService(client: client);

      final waypoints = [
        const Waypoint(
          lat: 52.0,
          lon: 4.0,
          altitudeM: 10, // 2 + 10 = 12 m AMSL: exakt der 10-m-Stuetzpunkt
          speedMs: 15,
          catchRadiusM: 60,
        ),
        const Waypoint(
          lat: 52.1,
          lon: 4.1,
          altitudeM: 80, // 50 + 80 = 130 m AMSL: exakt der 80-m-Stuetzpunkt
          speedMs: 15,
          catchRadiusM: 60,
        ),
      ];

      final result = await service.fetchWindForWaypoints(waypoints);

      expect(result[0].windSpeedMs, closeTo(3.0, 0.001));
      expect(result[0].windDirFromDeg, closeTo(190.0, 0.001));
      expect(result[0].windElevationM, closeTo(2.0, 0.001));

      expect(result[1].windSpeedMs, closeTo(9.0, 0.001));
      expect(result[1].windDirFromDeg, closeTo(250.0, 0.001));
      expect(result[1].windElevationM, closeTo(50.0, 0.001));
    });

    test('leere Wegpunktliste loest keinen Request aus', () async {
      var called = false;
      final client = MockClient((request) async {
        called = true;
        return http.Response('', 500);
      });
      final service = WindService(client: client);

      final result = await service.fetchWindForWaypoints(const []);

      expect(result, isEmpty);
      expect(called, isFalse);
    });
  });
}