using Opc.Ua;

namespace ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Tests.Adapters;

/// <summary>
/// MV-8: the OPC UA WRITE path (<see cref="RealOpcUaClient.WriteValueAsync"/>)
/// wraps the outgoing value in <c>new Variant(value)</c> and lets the OPC
/// Foundation SDK serialize it. For a structured multi-value (List) attribute
/// the value handed down is a CLR array. These tests assert that the load-bearing
/// step — wrapping an array in a <see cref="Variant"/> — succeeds without
/// throwing, which is what the write path relies on (no separate array handling
/// is required in our code). A full device round-trip needs a live server and is
/// covered by the live OPC UA browse/read smoke tests.
/// </summary>
[Trait("Category", "Unit")]
public class RealOpcUaClientArrayWriteTests
{
    [Fact]
    public void Variant_wraps_int_array_without_throwing()
    {
        var value = new[] { 10, 20, 30 };

        var ex = Record.Exception(() => new Variant(value));

        Assert.Null(ex);
        var variant = new Variant(value);
        Assert.Equal(BuiltInType.Int32, variant.TypeInfo.BuiltInType);
        Assert.Equal(ValueRanks.OneDimension, variant.TypeInfo.ValueRank);
    }

    [Fact]
    public void Variant_wraps_double_array_without_throwing()
    {
        var value = new[] { 1.5, 2.5, 3.5 };

        var ex = Record.Exception(() => new Variant(value));

        Assert.Null(ex);
        var variant = new Variant(value);
        Assert.Equal(BuiltInType.Double, variant.TypeInfo.BuiltInType);
        Assert.Equal(ValueRanks.OneDimension, variant.TypeInfo.ValueRank);
    }

    [Fact]
    public void Variant_wraps_string_array_without_throwing()
    {
        var value = new[] { "a", "b", "c" };

        var ex = Record.Exception(() => new Variant(value));

        Assert.Null(ex);
        var variant = new Variant(value);
        Assert.Equal(BuiltInType.String, variant.TypeInfo.BuiltInType);
        Assert.Equal(ValueRanks.OneDimension, variant.TypeInfo.ValueRank);
    }
}