/******************************************************************************
 * The MIT License (MIT)
 *
 * Copyright (c) 2021 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.
 ******************************************************************************/

#pragma once

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

struct MetalInitialContents
{
  MetalInitialContents()
  {
    RDCCOMPILE_ASSERT(std::is_standard_layout<MetalInitialContents>::value,
                      "MetalInitialContents must be POD");
    memset(this, 0, sizeof(*this));
  }

  MetalInitialContents(MetalResourceType t)
  {
    memset(this, 0, sizeof(*this));
    type = t;
  }

  MetalInitialContents(MetalResourceType t, bytebuf data)
  {
    memset(this, 0, sizeof(*this));
    type = t;
    resourceContents = data;
  }

  template <typename Configuration>
  void Free(ResourceManager<Configuration> *rm)
  {
    RDCASSERT(false);
  }
  bytebuf resourceContents;

  // for plain resources, we store the resource type
  MetalResourceType type;
};

struct MetalResourceManagerConfiguration
{
  typedef WrappedMTLObject *WrappedResourceType;
  typedef void *RealResourceType;
  typedef MetalResourceRecord RecordType;
  typedef MetalInitialContents InitialContentData;
};

class MetalResourceManager : public ResourceManager<MetalResourceManagerConfiguration>
{
public:
  MetalResourceManager(CaptureState &state, WrappedMTLDevice *device)
      : ResourceManager(state), m_Device(device)
  {
  }
  void SetState(CaptureState state) { m_State = state; }
  CaptureState GetState() { return m_State; }
  ~MetalResourceManager() {}
  void ClearWithoutReleasing()
  {
    // if any objects leaked past, it's no longer safe to delete them as we would
    // be calling Shutdown() after the device that owns them is destroyed. Instead
    // we just have to leak ourselves.
    RDCASSERT(m_LiveResourceMap.empty());
    RDCASSERT(m_InitialContents.empty());
    RDCASSERT(m_ResourceRecords.empty());
    RDCASSERT(m_CurrentResourceMap.empty());
    RDCASSERT(m_WrapperMap.empty());

    m_LiveResourceMap.clear();
    m_InitialContents.clear();
    m_ResourceRecords.clear();
    m_CurrentResourceMap.clear();
    m_WrapperMap.clear();
  }

  // ResourceManager interface
  ResourceId GetID(WrappedMTLObject *res)
  {
    if(res == NULL)
      return ResourceId();

    return res->m_ID;
  }
  // ResourceManager interface

  template <typename realtype>
  ResourceId WrapResource(realtype obj, typename UnwrapHelper<realtype>::Outer *&wrapped)
  {
    RDCASSERT(obj != NULL);
    RDCASSERT(m_Device != NULL);

    ResourceId id = ResourceIDGen::GetNewUniqueID();
    using WrappedType = typename UnwrapHelper<realtype>::Outer;
    wrapped = new WrappedType(obj, id, m_Device);
    wrapped->m_Real = obj;
    AddCurrentResource(id, wrapped);

    // TODO: implement RD MTL replay
    //    if(IsReplayMode(m_State))
    //     AddWrapper(wrapMetalResourceManager(obj));
    return id;
  }

  template <typename wrappedtype>
  void ReleaseWrappedResource(wrappedtype *wrapped)
  {
    ResourceId id = GetResID(wrapped);

    // TODO: implement RD MTL replay

    ResourceManager::ReleaseCurrentResource(id);
    MetalResourceRecord *record = GetRecord(wrapped);
    if(record)
    {
      record->Delete(this);
    }
    delete wrapped;
  }

  using ResourceManager::AddResourceRecord;

  template <typename wrappedtype>
  MetalResourceRecord *AddResourceRecord(wrappedtype *wrapped)
  {
    MetalResourceRecord *ret = wrapped->m_Record = ResourceManager::AddResourceRecord(wrapped->m_ID);

    ret->m_Resource = (WrappedMTLObject *)wrapped;
    ret->m_Type = (MetalResourceType)wrappedtype::TypeEnum;
    return ret;
  }

  // ResourceRecordHandler interface implemented in ResourceManager
  //  void MarkDirtyResource(ResourceId id);
  //  void RemoveResourceRecord(ResourceId id);
  //  void MarkResourceFrameReferenced(ResourceId id, FrameRefType refType);
  //  void DestroyResourceRecord(ResourceRecord *record);
  // ResourceRecordHandler interface

private:
  // ResourceManager interface
  bool ResourceTypeRelease(WrappedMTLObject *res);
  bool Prepare_InitialState(WrappedMTLObject *res);
  uint64_t GetSize_InitialState(ResourceId id, const MetalInitialContents &initial);
  bool Serialise_InitialState(WriteSerialiser &ser, ResourceId id, MetalResourceRecord *record,
                              const MetalInitialContents *initial);
  void Create_InitialState(ResourceId id, WrappedMTLObject *live, bool hasData);
  void Apply_InitialState(WrappedMTLObject *live, const MetalInitialContents &initial);
  // ResourceManager interface

  WrappedMTLDevice *m_Device;
};
