/// <summary>
///     Represents an L7 PSEM service response from the meter.
/// </summary>
/// <param name = "Code">The response code.</param>
/// <param name = "Data">The response data payload.</param>
public readonly record struct ServiceResponse(ResponseCode Code, ReadOnlyMemory<byte> Data)
{
#region Properties
    /// <summary>Gets whether this response indicates success.</summary>
    public bool IsOk => Code == ResponseCode.Ok;
    /// <summary>Gets whether this response contains data.</summary>
    public bool HasData => Data.Length > 0;

#endregion
#region Methods
    /// <summary>
    ///     Decodes a service response from L7 payload bytes.
    /// </summary>
    /// <param name = "payload">The L7 payload from the PSEM frame.</param>
    /// <returns>The decoded service response.</returns>
    public static Result<ServiceResponse> Decode(ReadOnlySpan<byte> payload)
    {
        if (payload.Length < 1)
            return PsemError.Framing("Empty service response payload");
        var code = (ResponseCode)payload[0];
        var data = payload.Length > 1 ? payload[1..].ToArray() : [];
        return new ServiceResponse(code, data);
    }

    /// <summary>
    ///     Converts this response to a <see cref = "Result{T}"/>, failing if the response is not OK.
    /// </summary>
    public Result<ReadOnlyMemory<byte>> ToResult() => IsOk ? Result<ReadOnlyMemory<byte>>.Success(Data) : PsemError.Protocol(Code);
#endregion
}