using AyCode.Core.Serializers.Binaries;
using AyCode.Core.Tests.TestModels;

namespace AyCode.Core.Tests.Serialization;

[TestClass]
public class AcBinarySerializerSGenNullComplexPropertyTests
{
    [TestMethod]
    [DataRow(true, true)]
    [DataRow(true, false)]
    [DataRow(false, false)]
    [DataRow(false, true)]
    public void Serialize_SGenComplexPropertyNull_DoesNotThrow_AndRoundTripsAsNull(bool useSgen, bool fastMode)
    {
        var model = new SGenNullComplexParent
        {
            Id = 7,
            Customer = null!,
            Note = "regression"
        };

        var options = fastMode ? AcBinarySerializerOptions.FastMode: AcBinarySerializerOptions.Default;
        options.UseGeneratedCode = useSgen;

        var bytes = AcBinarySerializer.Serialize(model, options);
        var roundTrip = AcBinaryDeserializer.Deserialize<SGenNullComplexParent>(bytes, options);

        Assert.IsNotNull(roundTrip);
        Assert.AreEqual(model.Id, roundTrip.Id);
        Assert.AreEqual(model.Note, roundTrip.Note);
        Assert.IsNull(roundTrip.Customer,
            "complex reference property must round-trip as null when source was null " +
            "(regression for SGen WriteObjectGenerated fallback else-branch null-check)");

        Assert.IsTrue(System.Array.IndexOf(bytes, (byte)BinaryTypeCode.PropertySkip) >= 0,
            "writer must emit PropertySkip marker on the null Customer slot " +
            "(deeper verification: confirms the fix took the PropertySkip path, " +
            "not an unrelated null-safe code path)");
    }

    [TestMethod]
    [DataRow(true, true)]
    [DataRow(true, false)]
    [DataRow(false, false)]
    [DataRow(false, true)]
    public void Serialize_SGenComplexPropertyNonNull_RoundTripsCorrectly(bool useSgen, bool fastMode)
    {
        var model = new SGenNullComplexParent
        {
            Id = 13,
            Customer = new NonGeneratedComplexCustomer { Id = 42, Name = "child" },
            Note = "positive"
        };

        var options = fastMode ? AcBinarySerializerOptions.FastMode: AcBinarySerializerOptions.Default;
        options.UseGeneratedCode = useSgen;

        var bytes = AcBinarySerializer.Serialize(model, options);
        var roundTrip = AcBinaryDeserializer.Deserialize<SGenNullComplexParent>(bytes, options);

        Assert.IsNotNull(roundTrip);
        Assert.AreEqual(model.Id, roundTrip.Id);
        Assert.AreEqual(model.Note, roundTrip.Note);
        Assert.IsNotNull(roundTrip.Customer,
            "non-null complex reference property must round-trip (null-check fix must not break the non-null path)");
        Assert.AreEqual(model.Customer.Id, roundTrip.Customer.Id);
        Assert.AreEqual(model.Customer.Name, roundTrip.Customer.Name);
    }
}