using Opc.Ua;
using Shouldly;
using Xunit;
using ZB.MOM.WW.LmxOpcUa.Host.Historian;

namespace ZB.MOM.WW.LmxOpcUa.Tests.Historian
{
    public class HistorianQualityMappingTests
    {
        /// <summary>
        /// Verifies that the Historian good-quality sentinel is surfaced to OPC UA clients as a good status code.
        /// </summary>
        [Fact]
        public void Quality0_MapsToGood()
        {
            HistorianDataSource.MapQuality(0).ShouldBe(StatusCodes.Good);
        }

        /// <summary>
        /// Verifies that the Historian bad-quality sentinel is surfaced to OPC UA clients as a bad status code.
        /// </summary>
        [Fact]
        public void Quality1_MapsToBad()
        {
            HistorianDataSource.MapQuality(1).ShouldBe(StatusCodes.Bad);
        }

        /// <summary>
        /// Verifies that Historian uncertainty quality bands are translated into OPC UA uncertain results.
        /// </summary>
        /// <param name="quality">A Wonderware Historian quality byte in the uncertain range.</param>
        [Theory]
        [InlineData(128)]
        [InlineData(133)]
        [InlineData(192)]
        public void QualityAbove128_MapsToUncertain(byte quality)
        {
            HistorianDataSource.MapQuality(quality).ShouldBe(StatusCodes.Uncertain);
        }

        /// <summary>
        /// Verifies that nonzero non-uncertain Historian quality values are treated as bad historical samples.
        /// </summary>
        /// <param name="quality">A Wonderware Historian quality byte that should map to an OPC UA bad status.</param>
        [Theory]
        [InlineData(2)]
        [InlineData(50)]
        [InlineData(127)]
        public void OtherBadQualities_MapToBad(byte quality)
        {
            HistorianDataSource.MapQuality(quality).ShouldBe(StatusCodes.Bad);
        }
    }
}