namespace ZB.MOM.WW.OtOpcUa.Driver.TwinCAT;

/// <summary>
///     Thrown by <see cref="ITwinCATClient.ReadValuesAsync"/> when the TARGET refuses the ADS sum-read
///     command as a whole (service or index group not supported). It is not a comms fault: the driver marks
///     the device "no sum-read" and re-reads the batch with individual reads, so the poll still completes.
/// </summary>
internal sealed class TwinCATSumReadRefusedException : Exception
{
    /// <summary>Initializes a new instance of the <see cref="TwinCATSumReadRefusedException"/> class.</summary>
    /// <param name="adsErrorCode">The overall ADS error code the target answered with.</param>
    /// <param name="inner">The underlying exception, if any.</param>
    public TwinCATSumReadRefusedException(uint adsErrorCode, Exception? inner = null)
        : base($"ADS sum-read refused by the target (ADS error {adsErrorCode})", inner)
    {
        AdsErrorCode = adsErrorCode;
    }

    /// <summary>Gets the overall ADS error code.</summary>
    public uint AdsErrorCode { get; }
}