import 'package:geolocator/geolocator.dart';

const double geofenceThresholdMeters = 500.0;
const Duration geofenceRetryCooldown = Duration(minutes: 30);

bool hasForegroundLocationAccess(LocationPermission permission) {
  return permission == LocationPermission.whileInUse ||
      permission == LocationPermission.always;
}

bool hasBackgroundLocationAccess(LocationPermission permission) {
  return permission == LocationPermission.always;
}

Duration? geofenceRetryRemaining(DateTime? lastFailureAt, {DateTime? now}) {
  if (lastFailureAt == null) return null;

  final currentTime = now ?? DateTime.now();
  final remaining = lastFailureAt
      .add(geofenceRetryCooldown)
      .difference(currentTime);
  if (remaining <= Duration.zero) {
    return null;
  }
  return remaining;
}

String formatGeofenceRetry(Duration remaining) {
  if (remaining.inHours >= 1) {
    final hours = remaining.inHours;
    final minutes = remaining.inMinutes.remainder(60);
    if (minutes == 0) return '$hours ч';
    return '$hours ч $minutes мин';
  }

  final minutes = remaining.inMinutes;
  if (minutes > 0) return '$minutes мин';

  return '${remaining.inSeconds.clamp(1, 59)} сек';
}

String formatDistanceMeters(double meters) {
  if (meters < 1000) {
    return '${meters.round()} м';
  }
  return '${(meters / 1000).toStringAsFixed(1)} км';
}