#pragma once

#include "drape_frontend/message_acceptor.hpp"
#include "drape_frontend/threads_commutator.hpp"
#include "drape_frontend/tile_utils.hpp"

#include "drape/graphics_context_factory.hpp"
#include "drape/texture_manager.hpp"

#include "base/thread.hpp"

#include <atomic>
#include <condition_variable>
#include <functional>
#include <memory>
#include <mutex>

namespace df
{
using OnGraphicsContextInitialized = std::function<void()>;

class BaseRenderer : public MessageAcceptor
{
public:
  struct Params
  {
    Params(dp::ApiVersion apiVersion, ref_ptr<ThreadsCommutator> commutator,
           ref_ptr<dp::GraphicsContextFactory> factory, ref_ptr<dp::TextureManager> texMng,
           OnGraphicsContextInitialized const & onGraphicsContextInitialized)
      : m_apiVersion(apiVersion)
      , m_commutator(commutator)
      , m_oglContextFactory(factory)
      , m_texMng(texMng)
      , m_onGraphicsContextInitialized(onGraphicsContextInitialized)
    {}

    dp::ApiVersion m_apiVersion;
    ref_ptr<ThreadsCommutator> m_commutator;
    ref_ptr<dp::GraphicsContextFactory> m_oglContextFactory;
    ref_ptr<dp::TextureManager> m_texMng;
    OnGraphicsContextInitialized m_onGraphicsContextInitialized;
  };

  BaseRenderer(ThreadsCommutator::ThreadName name, Params const & params);

  bool CanReceiveMessages();
  
  void IterateRenderLoop();

  void SetRenderingEnabled(ref_ptr<dp::GraphicsContextFactory> contextFactory);
  void SetRenderingDisabled(bool const destroySurface);

  bool IsRenderingEnabled() const;

protected:
  dp::ApiVersion m_apiVersion;
  ref_ptr<ThreadsCommutator> m_commutator;
  ref_ptr<dp::GraphicsContextFactory> m_contextFactory;
  ref_ptr<dp::GraphicsContext> m_context;
  ref_ptr<dp::TextureManager> m_texMng;

  void StartThread();
  void StopThread();

  void CreateContext();

  void CheckRenderingEnabled();
  
  virtual std::unique_ptr<threads::IRoutine> CreateRoutine() = 0;
  
  virtual void RenderFrame() = 0;

  virtual void OnContextCreate() = 0;
  virtual void OnContextDestroy() = 0;

  virtual void OnRenderingEnabled() {}
  virtual void OnRenderingDisabled() {}

private:
  using TCompletionHandler = std::function<void()>;
  
  void IterateRenderLoopImpl();

  threads::Thread m_selfThread;
  ThreadsCommutator::ThreadName m_threadName;

  std::mutex m_renderingEnablingMutex;
  std::condition_variable m_renderingEnablingCondition;
  std::atomic<bool> m_isEnabled;
  TCompletionHandler m_renderingEnablingCompletionHandler;
  std::mutex m_completionHandlerMutex;
  bool m_wasNotified;
  std::atomic<bool> m_wasContextReset;

  OnGraphicsContextInitialized m_onGraphicsContextInitialized;
  static std::atomic<uint8_t> m_contextCounter;

  bool FilterContextDependentMessage(ref_ptr<Message> msg);
  void SetRenderingEnabled(bool const isEnabled);
  void Notify();
  void WakeUp();
};
}  // namespace df