import 'package:geolocator/geolocator.dart';

class LocationPoint {
  const LocationPoint({
    required this.longitude,
    required this.latitude,
    required this.accuracy,
    required this.occurredAt,
  });

  final String longitude;
  final String latitude;
  final String accuracy;
  final DateTime occurredAt;
}

abstract interface class LocationService {
  Future<LocationPoint> current();
}

class GeolocatorLocationService implements LocationService {
  @override
  Future<LocationPoint> current() async {
    if (!await Geolocator.isLocationServiceEnabled()) {
      throw StateError('请先开启系统定位服务');
    }
    var permission = await Geolocator.checkPermission();
    if (permission == LocationPermission.denied) {
      permission = await Geolocator.requestPermission();
    }
    if (permission == LocationPermission.denied || permission == LocationPermission.deniedForever) {
      throw StateError('定位权限未授权，无法完成该在线动作');
    }
    final position = await Geolocator.getCurrentPosition();
    return LocationPoint(
      longitude: position.longitude.toStringAsFixed(7),
      latitude: position.latitude.toStringAsFixed(7),
      accuracy: position.accuracy.toStringAsFixed(1),
      occurredAt: position.timestamp,
    );
  }
}