wut/include/nn/sl/IStream.h

#pragma once

#include <wut.h>
#include <nn/result.h>
#include <nn/sl/details/IStreamDetails.h>
#include <nn/sl/sl_cpp.h>

#ifdef __cplusplus

namespace nn::sl
{
class IStream : public details::IStreamBase
{

public:
   IStream()
   {
      InitInternalVtable();
   }

   IStream(IStream &src)
   {
      InitInternalVtable();
   }

   IStream &
   operator=(const IStream &other)
   {
      InitInternalVtable();
      return *this;
   }

   IStream &
   operator=(IStream &&src) noexcept
   {
      InitInternalVtable();
      return *this;
   }

   ~IStream() override = default;

private:
   static nn::Result
   ReadWrapper(details::IStreamInternal *instance, uint32_t *bytesRead, void *buffer, uint32_t readSize)
   {
      return instance->vtable->instance->Read(bytesRead, buffer, readSize);
   }

   static nn::Result
   WriteWrapper(details::IStreamInternal *instance, uint32_t *bytesWritten, void *buffer, uint32_t readSize)
   {
      return instance->vtable->instance->Write(bytesWritten, buffer, readSize);
   }

   static nn::Result
   GetSizeWrapper(details::IStreamInternal *instance, uint32_t *fileSize)
   {
      return instance->vtable->instance->GetSize(fileSize);
   }

   static nn::Result
   SeekWrapper(details::IStreamInternal *instance, int32_t offset, nn::sl::SeekOrigin seekOrigin)
   {
      return instance->vtable->instance->Seek(offset, seekOrigin);
   }

   details::IStreamInternal *
   GetInternal() override
   {
      return &mInstance;
   }

   void
   InitInternalVtable()
   {
      mVTable          = {.instance  = this,
                          .ReadFn    = &ReadWrapper,
                          .WriteFn   = &WriteWrapper,
                          .GetSizeFn = &GetSizeWrapper,
                          .SeekFn    = &SeekWrapper};
      mInstance.vtable = &mVTable;
   }

   details::IStreamInternal mInstance{};
   details::IStreamInternalVTable mVTable{};
};
} // namespace nn::sl

#endif