using System.Data;
using JdeScoping.DataSync.Etl.Transformers;
using NSubstitute;

namespace JdeScoping.DataSync.Tests.Etl.Transformers;

public class DataTransformerBaseTests
{
    [Fact]
    public void MapOrdinal_DefaultImplementation_ReturnsOrdinalUnchanged()
    {
        // Arrange
        var transformer = new PassThroughTransformer();
        var reader = CreateMockReader(new[] { "A", "B", "C" });

        // Act
        var result = transformer.MapOrdinal(1, reader);

        // Assert
        Assert.Equal(1, result);
    }

    private static IDataReader CreateMockReader(string[] columns)
    {
        var reader = Substitute.For<IDataReader>();
        reader.FieldCount.Returns(columns.Length);
        for (int i = 0; i < columns.Length; i++)
        {
            var index = i;
            reader.GetName(index).Returns(columns[index]);
            reader.GetOrdinal(columns[index]).Returns(index);
        }
        return reader;
    }

    private class PassThroughTransformer : DataTransformerBase
    {
        public override string TransformerName => "PassThrough";
    }
}