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

namespace AyCode.Core.Tests.Serialization;

/// <summary>
/// Tests for Source Generator based serialization integration.
/// </summary>
[TestClass]
public class GeneratedSerializerIntegrationTests
{
    [TestMethod]
    public void GeneratedSerializerType_Exists_ForMarkedTypes()
    {
        // Arrange - types marked with [AcBinarySerializable]
        var type = typeof(GeneratedSerializerTestModel);
        
        // Act - find the generated serializer type directly
        var generatedTypeName = $"{type.FullName}_AcBinarySerializer";
        var serializerType = type.Assembly.GetType(generatedTypeName);
        
        // Assert
        Assert.IsNotNull(serializerType, 
            $"Generated serializer type '{generatedTypeName}' should exist for [AcBinarySerializable] marked type");
    }

    [TestMethod]
    public void GeneratedSerializerType_HasCorrectMethods()
    {
        // Arrange
        var type = typeof(SimpleGeneratedModel);
        
        // Act - find the generated serializer type directly
        var generatedTypeName = $"{type.FullName}_AcBinarySerializer";
        var serializerType = type.Assembly.GetType(generatedTypeName);
        
        // Assert
        Assert.IsNotNull(serializerType, $"Generated serializer type '{generatedTypeName}' should exist");
        
        var serializeMethod = serializerType.GetMethod("Serialize", 
            System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static);
        Assert.IsNotNull(serializeMethod, "Serialize method should exist");
        
        var deserializeMethod = serializerType.GetMethod("Deserialize", 
            System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static);
        Assert.IsNotNull(deserializeMethod, "Deserialize method should exist");
        
        var propertyNamesField = serializerType.GetField("PropertyNames", 
            System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static);
        Assert.IsNotNull(propertyNamesField, "PropertyNames field should exist");
        
        var propertyNames = propertyNamesField.GetValue(null) as string[];
        Assert.IsNotNull(propertyNames, "PropertyNames should not be null");
        Assert.AreEqual(3, propertyNames.Length, "SimpleGeneratedModel has 3 properties");
        
        // Verify alphabetical order
        Assert.AreEqual("Age", propertyNames[0]);
        Assert.AreEqual("FirstName", propertyNames[1]);
        Assert.AreEqual("LastName", propertyNames[2]);
    }

    [TestMethod]
    public void GeneratedSerializerPropertyNames_MatchRuntimeOrder()
    {
        // This test verifies that the generated property order matches the runtime serializer's order
        // This is critical for binary compatibility!
        
        var type = typeof(GeneratedSerializerTestModel);
        
        // Get generated property names
        var generatedTypeName = $"{type.FullName}_AcBinarySerializer";
        var serializerType = type.Assembly.GetType(generatedTypeName);
        Assert.IsNotNull(serializerType);
        
        var propertyNamesField = serializerType.GetField("PropertyNames", 
            System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static);
        var generatedNames = propertyNamesField?.GetValue(null) as string[];
        Assert.IsNotNull(generatedNames);
        
        // Get runtime property names using the same logic as TypeMetadataBase
        var runtimeProps = type.GetProperties(
            System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance)
            .Where(p => p.CanRead && p.CanWrite && !p.GetIndexParameters().Any())
            .OrderBy(p => p.Name, StringComparer.Ordinal)
            .Select(p => p.Name)
            .ToArray();
        
        // Assert they match
        CollectionAssert.AreEqual(runtimeProps, generatedNames,
            "Generated property names must match runtime property order for binary compatibility");
    }

    [TestMethod]
    public void Serialization_WorksCorrectly_WithGeneratedSerializerPresent()
    {
        // This test ensures that regular serialization still works even when
        // generated serializers are present (they are not yet integrated into the hot path)
        
        var original = new GeneratedSerializerTestModel
        {
            Id = 42,
            Name = "Test",
            IsActive = true,
            Value = 3.14,
            Created = new DateTime(2025, 1, 5, 10, 30, 0, DateTimeKind.Utc),
            UniqueId = Guid.NewGuid(),
            Price = 99.99m,
            BigNumber = 9999999999L
        };
        
        // Serialize and deserialize using the regular path
        var bytes = AcBinarySerializer.Serialize(original, AcBinarySerializerOptions.WithoutReferenceHandling);
        var deserialized = AcBinaryDeserializer.Deserialize<GeneratedSerializerTestModel>(bytes);
        
        // Assert
        Assert.IsNotNull(deserialized);
        Assert.AreEqual(original.Id, deserialized.Id);
        Assert.AreEqual(original.Name, deserialized.Name);
        Assert.AreEqual(original.IsActive, deserialized.IsActive);
        Assert.AreEqual(original.Value, deserialized.Value);
        Assert.AreEqual(original.Created, deserialized.Created);
        Assert.AreEqual(original.UniqueId, deserialized.UniqueId);
        Assert.AreEqual(original.Price, deserialized.Price);
        Assert.AreEqual(original.BigNumber, deserialized.BigNumber);
    }

    [TestMethod]
    public void NestedType_GeneratedSerializer_IsFound()
    {
        // Test that nested types (like QuickBenchmark.TestClassWithRepeatedValues) 
        // have their generated serializers properly named and discoverable
        
        var type = typeof(QuickBenchmark.TestClassWithRepeatedValues);
        var ns = type.Namespace ?? "";
        
        // For nested types, the generated class is at namespace level with just the type name
        var simpleName = $"{(string.IsNullOrEmpty(ns) ? "" : ns + ".")}{type.Name}_AcBinarySerializer";
        var serializerType = type.Assembly.GetType(simpleName);
        
        Assert.IsNotNull(serializerType, 
            $"Generated serializer for nested type should be found at '{simpleName}'");
        
        // Verify it has the expected methods
        Assert.IsNotNull(serializerType.GetMethod("Serialize", 
            System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static));
        Assert.IsNotNull(serializerType.GetMethod("Deserialize", 
            System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static));
    }
}