using Shouldly;
using Xunit;

namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Sql.Common.Tests;

/// <summary>The pinned SDK is the oracle for the info-bit constants (StatusCodeParityTests covers the named codes).</summary>
public sealed class StatusCodeOracleTests
{
    [Fact]
    public void Calculated_bits_match_the_SDK()
    {
        var sdk = new Opc.Ua.StatusCode(Opc.Ua.StatusCodes.Good).SetAggregateBits(Opc.Ua.AggregateBits.Calculated);
        sdk.Code.ShouldBe(HistorianInfoBits.WithCalculated(HistorianStatusCodes.Good));
        ((uint)Opc.Ua.AggregateBits.Calculated).ShouldBe(HistorianInfoBits.HistorianCalculated);
    }

    [Fact]
    public void Interpolated_bits_match_the_SDK()
    {
        var sdk = new Opc.Ua.StatusCode(Opc.Ua.StatusCodes.Good).SetAggregateBits(Opc.Ua.AggregateBits.Interpolated);
        sdk.Code.ShouldBe(HistorianInfoBits.WithInterpolated(HistorianStatusCodes.Good));
        ((uint)Opc.Ua.AggregateBits.Interpolated).ShouldBe(HistorianInfoBits.HistorianInterpolated);
    }

    /// <summary>
    ///     A stored status that already carries a historian bit (a sample written via HistoryUpdate with the Calculated
    ///     bit, say) must come back with ONE historian bit, never both: the existing pair is masked off first. The SDK
    ///     agrees — <c>SetAggregateBits</c> replaces, it does not OR.
    /// </summary>
    [Fact]
    public void Setting_one_historian_bit_clears_the_other()
    {
        var calculatedUncertain = HistorianStatusCodes.UncertainDataSubNormal | 0x400u | HistorianInfoBits.HistorianCalculated;
        var interpolated = HistorianInfoBits.WithInterpolated(calculatedUncertain);
        interpolated.ShouldBe(HistorianStatusCodes.UncertainDataSubNormal | 0x400u | HistorianInfoBits.HistorianInterpolated);
        new Opc.Ua.StatusCode(interpolated).AggregateBits.ShouldBe(Opc.Ua.AggregateBits.Interpolated);

        var interpolatedGood = 0x400u | HistorianInfoBits.HistorianInterpolated;
        HistorianInfoBits.WithCalculated(interpolatedGood).ShouldBe(0x400u | HistorianInfoBits.HistorianCalculated);
    }

    [Fact]
    public void Partial_bit_matches_the_SDK() =>
        ((uint)Opc.Ua.AggregateBits.Partial).ShouldBe(HistorianInfoBits.HistorianPartial);

    [Fact]
    public void Generic_bad_matches_the_SDK() =>
        HistorianStatusCodes.Bad.ShouldBe(Opc.Ua.StatusCodes.Bad);

    [Fact]
    public void Info_type_is_data_value() =>
        HistorianInfoBits.InfoTypeDataValue.ShouldBe(0x400u);
}