#pragma once

#include "drape/pointers.hpp"
#include "drape/binding_info.hpp"

#include "base/shared_buffer_manager.hpp"

#include "std/cstdint.hpp"
#include "std/map.hpp"

namespace dp
{

struct MutateRegion
{
  MutateRegion() : m_offset(0), m_count(0) {}
  MutateRegion(uint32_t offset, uint32_t count) : m_offset(offset), m_count(count) {}

  uint32_t m_offset; // Offset from buffer begin in "Elements" not in bytes
  uint32_t m_count;  // Count of "Elements".
};

struct MutateNode
{
  MutateRegion m_region;
  ref_ptr<void> m_data;
};

class AttributeBufferMutator
{
  typedef pair<SharedBufferManager::shared_buffer_ptr_t, size_t> TBufferNode;
  typedef vector<TBufferNode> TBufferArray;
  typedef vector<MutateNode> TMutateNodes;
  typedef map<BindingInfo, TMutateNodes> TMutateData;
public:
  ~AttributeBufferMutator();
  void AddMutation(BindingInfo const & info, MutateNode const & node);
  void * AllocateMutationBuffer(uint32_t byteCount);

private:
  friend class VertexArrayBuffer;
  TMutateData const & GetMutateData() const { return m_data; }

private:
  TMutateData m_data;
  TBufferArray m_array;
};

} // namespace dp