class GeofenceRuntimeState {
  final String? armedHomeId;
  final DateTime? lastCheckAt;
  final double? lastDistanceMeters;
  final String? triggeredHomeId;
  final DateTime? triggeredAt;
  final String? lastSuccessHomeId;
  final DateTime? lastSuccessAt;
  final String? lastFailureHomeId;
  final DateTime? lastFailureAt;
  final String? lastFailureMessage;

  const GeofenceRuntimeState({
    this.armedHomeId,
    this.lastCheckAt,
    this.lastDistanceMeters,
    this.triggeredHomeId,
    this.triggeredAt,
    this.lastSuccessHomeId,
    this.lastSuccessAt,
    this.lastFailureHomeId,
    this.lastFailureAt,
    this.lastFailureMessage,
  });

  bool isTriggeredFor(String homeId) =>
      triggeredHomeId == homeId && triggeredAt != null;

  DateTime? failureAtFor(String homeId) {
    if (lastFailureHomeId != homeId) return null;
    return lastFailureAt;
  }

  String? failureMessageFor(String homeId) {
    if (lastFailureHomeId != homeId) return null;
    return lastFailureMessage;
  }

  GeofenceRuntimeState armForHome(String homeId) {
    if (armedHomeId == homeId) return this;

    return GeofenceRuntimeState(
      armedHomeId: homeId,
      lastSuccessHomeId: lastSuccessHomeId,
      lastSuccessAt: lastSuccessAt,
      lastFailureHomeId: lastFailureHomeId,
      lastFailureAt: lastFailureAt,
      lastFailureMessage: lastFailureMessage,
    );
  }

  GeofenceRuntimeState disarm() {
    return GeofenceRuntimeState(
      lastSuccessHomeId: lastSuccessHomeId,
      lastSuccessAt: lastSuccessAt,
      lastFailureHomeId: lastFailureHomeId,
      lastFailureAt: lastFailureAt,
      lastFailureMessage: lastFailureMessage,
    );
  }

  GeofenceRuntimeState recordInsideHome(
    String homeId, {
    required DateTime checkedAt,
    required double distanceMeters,
  }) {
    return GeofenceRuntimeState(
      armedHomeId: armedHomeId,
      lastCheckAt: checkedAt,
      lastDistanceMeters: distanceMeters,
      lastSuccessHomeId: lastSuccessHomeId,
      lastSuccessAt: lastSuccessAt,
      lastFailureHomeId: lastFailureHomeId == homeId ? null : lastFailureHomeId,
      lastFailureAt: lastFailureHomeId == homeId ? null : lastFailureAt,
      lastFailureMessage: lastFailureHomeId == homeId
          ? null
          : lastFailureMessage,
    );
  }

  GeofenceRuntimeState recordOutsideCheck(
    String homeId, {
    required DateTime checkedAt,
    required double distanceMeters,
  }) {
    return GeofenceRuntimeState(
      armedHomeId: armedHomeId ?? homeId,
      lastCheckAt: checkedAt,
      lastDistanceMeters: distanceMeters,
      triggeredHomeId: triggeredHomeId,
      triggeredAt: triggeredAt,
      lastSuccessHomeId: lastSuccessHomeId,
      lastSuccessAt: lastSuccessAt,
      lastFailureHomeId: lastFailureHomeId,
      lastFailureAt: lastFailureAt,
      lastFailureMessage: lastFailureMessage,
    );
  }

  GeofenceRuntimeState recordSuccess(
    String homeId, {
    required DateTime triggeredAt,
    required double distanceMeters,
  }) {
    return GeofenceRuntimeState(
      armedHomeId: homeId,
      lastCheckAt: triggeredAt,
      lastDistanceMeters: distanceMeters,
      triggeredHomeId: homeId,
      triggeredAt: triggeredAt,
      lastSuccessHomeId: homeId,
      lastSuccessAt: triggeredAt,
      lastFailureHomeId: lastFailureHomeId == homeId ? null : lastFailureHomeId,
      lastFailureAt: lastFailureHomeId == homeId ? null : lastFailureAt,
      lastFailureMessage: lastFailureHomeId == homeId
          ? null
          : lastFailureMessage,
    );
  }

  GeofenceRuntimeState recordFailure(
    String homeId, {
    required DateTime failedAt,
    required double distanceMeters,
    required String message,
  }) {
    return GeofenceRuntimeState(
      armedHomeId: homeId,
      lastCheckAt: failedAt,
      lastDistanceMeters: distanceMeters,
      triggeredHomeId: triggeredHomeId == homeId ? null : triggeredHomeId,
      triggeredAt: triggeredHomeId == homeId ? null : triggeredAt,
      lastSuccessHomeId: lastSuccessHomeId,
      lastSuccessAt: lastSuccessAt,
      lastFailureHomeId: homeId,
      lastFailureAt: failedAt,
      lastFailureMessage: message,
    );
  }

  GeofenceRuntimeState removeHome(String homeId) {
    return GeofenceRuntimeState(
      armedHomeId: armedHomeId == homeId ? null : armedHomeId,
      lastCheckAt: armedHomeId == homeId ? null : lastCheckAt,
      lastDistanceMeters: armedHomeId == homeId ? null : lastDistanceMeters,
      triggeredHomeId: triggeredHomeId == homeId ? null : triggeredHomeId,
      triggeredAt: triggeredHomeId == homeId ? null : triggeredAt,
      lastSuccessHomeId: lastSuccessHomeId == homeId ? null : lastSuccessHomeId,
      lastSuccessAt: lastSuccessHomeId == homeId ? null : lastSuccessAt,
      lastFailureHomeId: lastFailureHomeId == homeId ? null : lastFailureHomeId,
      lastFailureAt: lastFailureHomeId == homeId ? null : lastFailureAt,
      lastFailureMessage: lastFailureHomeId == homeId
          ? null
          : lastFailureMessage,
    );
  }

  Map<String, dynamic> toJson() => {
    if (armedHomeId != null) 'armedHomeId': armedHomeId,
    if (lastCheckAt != null) 'lastCheckAt': lastCheckAt!.millisecondsSinceEpoch,
    if (lastDistanceMeters != null) 'lastDistanceMeters': lastDistanceMeters,
    if (triggeredHomeId != null) 'triggeredHomeId': triggeredHomeId,
    if (triggeredAt != null) 'triggeredAt': triggeredAt!.millisecondsSinceEpoch,
    if (lastSuccessHomeId != null) 'lastSuccessHomeId': lastSuccessHomeId,
    if (lastSuccessAt != null)
      'lastSuccessAt': lastSuccessAt!.millisecondsSinceEpoch,
    if (lastFailureHomeId != null) 'lastFailureHomeId': lastFailureHomeId,
    if (lastFailureAt != null)
      'lastFailureAt': lastFailureAt!.millisecondsSinceEpoch,
    if (lastFailureMessage != null) 'lastFailureMessage': lastFailureMessage,
  };

  factory GeofenceRuntimeState.fromJson(Map<String, dynamic> json) {
    return GeofenceRuntimeState(
      armedHomeId: json['armedHomeId'] as String?,
      lastCheckAt: _fromMillis(json['lastCheckAt']),
      lastDistanceMeters: (json['lastDistanceMeters'] as num?)?.toDouble(),
      triggeredHomeId: json['triggeredHomeId'] as String?,
      triggeredAt: _fromMillis(json['triggeredAt']),
      lastSuccessHomeId: json['lastSuccessHomeId'] as String?,
      lastSuccessAt: _fromMillis(json['lastSuccessAt']),
      lastFailureHomeId: json['lastFailureHomeId'] as String?,
      lastFailureAt: _fromMillis(json['lastFailureAt']),
      lastFailureMessage: json['lastFailureMessage'] as String?,
    );
  }

  static DateTime? _fromMillis(Object? value) {
    final millis = (value as num?)?.toInt();
    if (millis == null) return null;
    return DateTime.fromMillisecondsSinceEpoch(millis);
  }
}