sealed class DeviceStatus : IEquatable<DeviceStatus>
    {
        [Flags]
        private enum StatusRepresentation
        {
            AllFine = 0,
            NotOperational = 1,
            VisiblyDamaged = 2,
            CircuitryFailed = 4
        }

        private StatusRepresentation Representation { get; }

        private DeviceStatus(StatusRepresentation representation)
        {
            this.Representation = representation;
        }

        public static DeviceStatus AllFine() =>
            new DeviceStatus(StatusRepresentation.AllFine);

        public DeviceStatus WithVisibleDamage() =>
            new DeviceStatus(this.Representation | StatusRepresentation.VisiblyDamaged);

        public DeviceStatus NotOperational() =>
            new DeviceStatus(this.Representation | StatusRepresentation.NotOperational);

        public DeviceStatus Repaired() =>
            new DeviceStatus(this.Representation & ~StatusRepresentation.NotOperational);

        public DeviceStatus CircuitryFailed() =>
            new DeviceStatus(this.Representation | StatusRepresentation.CircuitryFailed);

        public DeviceStatus CircuitryReplaced() =>
            new DeviceStatus(this.Representation & ~StatusRepresentation.CircuitryFailed);

        public override int GetHashCode() => (int)this.Representation;

        public override bool Equals(object obj) => this.Equals(obj as DeviceStatus);

        public bool Equals(DeviceStatus other) =>
            other != null && this.Representation == other.Representation;

        public static bool operator ==(DeviceStatus a, DeviceStatus b) =>
            (object.ReferenceEquals(a, null) && object.ReferenceEquals(b, null)) ||
            (!object.ReferenceEquals(a, null) && a.Equals(b));

        public static bool operator !=(DeviceStatus a, DeviceStatus b) => !(a == b);
    }