// Copyright Epic Games, Inc. All Rights Reserved.

#include "Serialization/ArchiveDescribeReference.h"
#include "UObject/UnrealType.h"

FArchiveDescribeReference::FArchiveDescribeReference(UObject* Src, UObject* InTarget, FOutputDevice& InOutput): Source(Src), Target(InTarget), Output(InOutput)
{
    // use the optimized RefLink to skip over properties which don't contain object references
    ArIsObjectReferenceCollector = true;

    ArIgnoreArchetypeRef         = false;
    ArIgnoreOuterRef             = true;
    ArIgnoreClassRef             = false;

    Source->Serialize(*this);
}

FArchive& FArchiveDescribeReference::operator<<(class UObject*& Obj)
{
    if (Obj == Target)
    {
        if (GetSerializedProperty())
        {
            Output.Logf(TEXT("        [%s]"), *GetSerializedProperty()->GetFullName());
        }
        else
        {
            Output.Logf(TEXT("        [native]"));
        }
        PTRINT BigOffset = ((uint8*)&Obj) - (uint8*)Source;
        if (BigOffset > 0 && BigOffset < Source->GetClass()->GetPropertiesSize())
        {
            int32 Offset       = int32(BigOffset);
            UClass* UseClass   = Source->GetClass();
            UClass* SuperClass = UseClass->GetSuperClass();
            while (1)
            {
                if (!SuperClass || Offset >= SuperClass->GetPropertiesSize())
                {
                    break;
                }
                UseClass   = SuperClass;
                SuperClass = UseClass->GetSuperClass();
            }
            Output.Logf(TEXT("            class %s offset %d, offset from UObject %d "), *UseClass->GetName(), SuperClass ? Offset - SuperClass->GetPropertiesSize() : Offset, Offset);
        }
    }
    return *this;
}