import 'package:flutter/foundation.dart';

/// Native GPS speed snapshot. Speed is in km/h; a stationary fix is 0.
@immutable
class GpsSpeed {
  const GpsSpeed({
    this.hasPermission = false,
    this.hasFix = false,
    this.speedKmh,
    this.updatedAt = 0,
  });

  final bool hasPermission;
  final bool hasFix;
  final double? speedKmh;
  final int updatedAt;

  bool isFresh(DateTime now) {
    if (!hasFix || speedKmh == null || updatedAt <= 0) return false;
    final age = now.millisecondsSinceEpoch - updatedAt;
    return age >= 0 && age < 5000;
  }

  factory GpsSpeed.fromMap(Map<dynamic, dynamic> map) {
    return GpsSpeed(
      hasPermission: map['hasPermission'] == true,
      hasFix: map['hasFix'] == true,
      speedKmh: (map['speedKmh'] as num?)?.toDouble(),
      updatedAt: (map['updatedAt'] as num?)?.toInt() ?? 0,
    );
  }

  @override
  bool operator ==(Object other) {
    return other is GpsSpeed &&
        other.hasPermission == hasPermission &&
        other.hasFix == hasFix &&
        other.speedKmh == speedKmh &&
        other.updatedAt == updatedAt;
  }

  @override
  int get hashCode => Object.hash(hasPermission, hasFix, speedKmh, updatedAt);
}