import 'package:tane/services/coarse_location.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  const channel = MethodChannel('org.comunes.tane/coarse_location');
  final messenger =
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger;

  tearDown(() {
    messenger.setMockMethodCallHandler(channel, null);
    debugDefaultTargetPlatformOverride = null;
  });

  test('returns the lat/lon the platform channel provides', () async {
    debugDefaultTargetPlatformOverride = TargetPlatform.android;
    messenger.setMockMethodCallHandler(channel, (call) async {
      expect(call.method, 'getCoarseLatLon');
      return {'lat': 41.39, 'lon': 2.16};
    });

    final loc = await const NativeCoarseLocation().currentCoarseLatLon();

    expect(loc, isNotNull);
    expect(loc!.lat, 41.39);
    expect(loc.lon, 2.16);
  });

  test('returns null when the platform reports no fix (denied/off)', () async {
    debugDefaultTargetPlatformOverride = TargetPlatform.android;
    messenger.setMockMethodCallHandler(channel, (call) async => null);

    expect(await const NativeCoarseLocation().currentCoarseLatLon(), isNull);
  });

  test('returns null instead of throwing on a channel error', () async {
    debugDefaultTargetPlatformOverride = TargetPlatform.android;
    messenger.setMockMethodCallHandler(channel, (call) async {
      throw PlatformException(code: 'boom');
    });

    expect(await const NativeCoarseLocation().currentCoarseLatLon(), isNull);
  });

  test('returns null off Android without touching the channel', () async {
    debugDefaultTargetPlatformOverride = TargetPlatform.linux;
    var invoked = false;
    messenger.setMockMethodCallHandler(channel, (call) async {
      invoked = true;
      return {'lat': 1.0, 'lon': 1.0};
    });

    expect(await const NativeCoarseLocation().currentCoarseLatLon(), isNull);
    expect(invoked, isFalse);
  });
}