/******************************************************************************
 * The MIT License (MIT)
 *
 * Copyright (c) 2022 Baldur Karlsson
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 ******************************************************************************/

#include "metal_buffer.h"
#include "core/core.h"
#include "metal_resources.h"

WrappedMTLBuffer::WrappedMTLBuffer(MTL::Buffer *realMTLBuffer, ResourceId objId,
                                   WrappedMTLDevice *wrappedMTLDevice)
    : WrappedMTLObject(realMTLBuffer, objId, wrappedMTLDevice, wrappedMTLDevice->GetStateRef())
{
  if(realMTLBuffer && objId != ResourceId())
    AllocateObjCBridge(this);
}

void *WrappedMTLBuffer::contents()
{
  void *data = Unwrap(this)->contents();

  if(IsCaptureMode(m_State))
  {
    // Snapshot potentially CPU modified buffer if the returned pointer is not NULL
    if(data)
    {
      GetResourceManager()->MarkDirtyResource(m_ID);
    }
  }
  else
  {
    // TODO: implement RD MTL replay
  }
  return data;
}

template <typename SerialiserType>
bool WrappedMTLBuffer::Serialise_didModifyRange(SerialiserType &ser, NS::Range &range)
{
  SERIALISE_ELEMENT_LOCAL(Buffer, this);
  SERIALISE_ELEMENT(range).Important();
  byte *pData = NULL;
  uint64_t memSize = range.length;
  if(ser.IsWriting())
  {
    pData = (byte *)Unwrap(this)->contents() + range.location;
  }
  if(IsReplayingAndReading())
  {
    pData = (byte *)Unwrap(Buffer)->contents() + range.location;
  }

  // serialise directly using buffer memory
  ser.Serialise("data"_lit, pData, memSize, SerialiserFlags::NoFlags).Important();

  SERIALISE_CHECK_READ_ERRORS();

  // TODO: implement RD MTL replay
  if(IsReplayingAndReading())
  {
    Unwrap(Buffer)->didModifyRange(range);
  }
  return true;
}

void WrappedMTLBuffer::didModifyRange(NS::Range &range)
{
  SERIALISE_TIME_CALL(Unwrap(this)->didModifyRange(range));
  if(IsCaptureMode(m_State))
  {
    if(IsBackgroundCapturing(m_State))
    {
      // Snapshot potentially CPU modified buffer
      GetResourceManager()->MarkDirtyResource(m_ID);
    }
    else
    {
      Chunk *chunk = NULL;
      {
        CACHE_THREAD_SERIALISER();
        SCOPED_SERIALISE_CHUNK(MetalChunk::MTLBuffer_didModifyRange);
        Serialise_didModifyRange(ser, range);
        chunk = scope.Get();
      }
      m_Device->AddFrameCaptureRecordChunk(chunk);
    }
  }
  else
  {
    // TODO: implement RD MTL replay
  }
}

template <typename SerialiserType>
bool WrappedMTLBuffer::Serialise_InternalModifyCPUContents(SerialiserType &ser, uint64_t start,
                                                           uint64_t end, MetalBufferInfo *bufInfo)
{
  SERIALISE_ELEMENT_LOCAL(Buffer, this).Important();
  SERIALISE_ELEMENT(start).Important();
  uint64_t size = end - start;
  SERIALISE_ELEMENT(size).Important();
  byte *pData = NULL;
  if(ser.IsWriting())
  {
    pData = (byte *)Unwrap(this)->contents() + start;
  }
  if(IsReplayingAndReading())
  {
    pData = (byte *)Unwrap(Buffer)->contents() + start;
  }

  // serialise directly using buffer memory
  ser.Serialise("data"_lit, pData, size, SerialiserFlags::NoFlags);

  if(IsCaptureMode(m_State))
  {
    // update the base snapshot from the serialised data
    size_t offs = size_t(ser.GetWriter()->GetOffset() - size);
    const byte *serialisedData = ser.GetWriter()->GetData() + offs;
    if(bufInfo->baseSnapshot.isEmpty())
      bufInfo->baseSnapshot.resize(bufInfo->length);
    RDCASSERTEQUAL(bufInfo->baseSnapshot.size(), bufInfo->length);
    memcpy(bufInfo->baseSnapshot.data() + start, serialisedData, size);
  }

  SERIALISE_CHECK_READ_ERRORS();

  return true;
}

INSTANTIATE_FUNCTION_SERIALISED(WrappedMTLBuffer, void, didModifyRange, NS::Range &);
INSTANTIATE_FUNCTION_SERIALISED(WrappedMTLBuffer, void, InternalModifyCPUContents, uint64_t,
                                uint64_t, MetalBufferInfo *);
