lmxopcua/src/ZB.MOM.WW.LmxOpcUa.Host/Domain/Vtq.cs

using System;

namespace ZB.MOM.WW.LmxOpcUa.Host.Domain
{
    /// <summary>
    /// Value-Timestamp-Quality triplet for tag data. (MXA-003, OPC-007)
    /// </summary>
    public readonly struct Vtq : IEquatable<Vtq>
    {
        public object? Value { get; }
        public DateTime Timestamp { get; }
        public Quality Quality { get; }

        public Vtq(object? value, DateTime timestamp, Quality quality)
        {
            Value = value;
            Timestamp = timestamp;
            Quality = quality;
        }

        public static Vtq Good(object? value) => new Vtq(value, DateTime.UtcNow, Quality.Good);
        public static Vtq Bad(Quality quality = Quality.Bad) => new Vtq(null, DateTime.UtcNow, quality);
        public static Vtq Uncertain(object? value) => new Vtq(value, DateTime.UtcNow, Quality.Uncertain);

        public bool Equals(Vtq other) =>
            Equals(Value, other.Value) && Timestamp == other.Timestamp && Quality == other.Quality;

        public override bool Equals(object? obj) => obj is Vtq other && Equals(other);
        public override int GetHashCode() => HashCode.Combine(Value, Timestamp, Quality);
        public override string ToString() => $"Vtq({Value}, {Timestamp:O}, {Quality})";
    }
}