using System;
using Mocha.Core.Oop;
using Mocha.Testing;
using Newtonsoft.Json.Serialization;

namespace Mocha.Core.Tests;

public class DerivedInstanceTests : OmsTestsBase
{
	Class TEST_CLASS_DERIVED;
	InstanceKey ik_derived;

    protected override void AfterSetup()
    {
        base.AfterSetup();

		TEST_CLASS_DERIVED = Oms.CreateClass("Test Class (Derived)");
		ik_derived = Oms.GetInstanceKey(TEST_CLASS_DERIVED);

		Oms.SetAttributeValue(TEST_CLASS_DERIVED, Oms.GetInstance(KnownAttributeGuids.Boolean.Derived), true);

		// Derived classes are represented only by InstanceKeys with the form {ClassId}!{DerivedData}, where
		// {DerivedData} is a Base64 string encoding all the attributes and relationships associated with the
		// derived instance.

		// ? Should we be concerned with memory leaks given the lazy implementation of GetInstance on a derived
		// ? InstanceKey essentially allocates a new InstanceHandle each time it's called ???
		Oms.AddAttribute(TEST_CLASS_DERIVED, Oms.GetInstance(KnownAttributeGuids.Text.Name));
    }

	const string TEST_DERIVED_VALUE = "Test Class Derived #1";

    [Test]
	public void Derived_Instance_Test_get_Text_Attribute_Value()
	{
		InstanceHandle iTestClassDerived = Oms.CreateInstanceOf(TEST_CLASS_DERIVED);
		Oms.SetAttributeValue(iTestClassDerived, Oms.GetInstance(KnownAttributeGuids.Text.Name), TEST_DERIVED_VALUE);

		InstanceKey ik = Oms.GetInstanceKey(iTestClassDerived);

		InstanceHandle h2 = Oms.GetInstance(ik);
		Dictionary<InstanceHandle, object?>? dict = Oms.GetDerivedData(h2);

		string attVName = Oms.GetAttributeValue<string>(h2, Oms.GetInstance(KnownAttributeGuids.Text.Name));
		Assert.That(attVName, Is.EqualTo(TEST_DERIVED_VALUE));
	}

	[Test]
	public void Derived_Instance_Test__instance_key_Parse()
	{
		string ikStr = String.Format("{0}!FQAAABVUZXN0IENsYXNzIERlcml2ZWQgIzE=", ik_derived.InstanceIndex);
		InstanceKey ik = InstanceKey.Parse(ikStr);

		InstanceHandle ih = Oms.GetInstance(ik);
		
		string attVName = Oms.GetAttributeValue<string>(ik, Oms.GetInstance(KnownAttributeGuids.Text.Name));
		Assert.That(attVName, Is.EqualTo(TEST_DERIVED_VALUE));
	}

}