// Copyright 2023 DeepMind Technologies Limited
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef MUJOCO_SIMULATE_GLFW_ADAPTER_H_
#define MUJOCO_SIMULATE_GLFW_ADAPTER_H_

#include <utility>

#include <GLFW/glfw3.h>
#include <mujoco/mujoco.h>
#include "platform_ui_adapter.h"

#ifdef __APPLE__
#include <optional>
#include "glfw_corevideo.h"
#endif

namespace mujoco {
class GlfwAdapter : public PlatformUIAdapter {
 public:
  GlfwAdapter();
  ~GlfwAdapter() override;

  std::pair<double, double> GetCursorPosition() const override;
  double GetDisplayPixelsPerInch() const override;
  std::pair<int, int> GetFramebufferSize() const override;
  std::pair<int, int> GetWindowSize() const override;
  bool IsGPUAccelerated() const override;
  void PollEvents() override;
  void SetClipboardString(const char* text) override;
  void SetVSync(bool enabled) override;
  void SetWindowTitle(const char* title) override;
  bool ShouldCloseWindow() const override;
  void SwapBuffers() override;
  void ToggleFullscreen() override;

  bool IsLeftMouseButtonPressed() const override;
  bool IsMiddleMouseButtonPressed() const override;
  bool IsRightMouseButtonPressed() const override;

  bool IsAltKeyPressed() const override;
  bool IsCtrlKeyPressed() const override;
  bool IsShiftKeyPressed() const override;

  bool IsMouseButtonDownEvent(int act) const override;
  bool IsKeyDownEvent(int act) const override;

  int TranslateKeyCode(int key) const override;
  mjtButton TranslateMouseButton(int button) const override;

 private:
  GLFWvidmode vidmode_;
  GLFWwindow* window_;

  // store last window information when going to full screen
  std::pair<int, int> window_pos_;
  std::pair<int, int> window_size_;

#ifdef __APPLE__
  // Workaround for perpertually broken OpenGL VSync on macOS,
  // most recently https://github.com/glfw/glfw/issues/2249.
  std::optional<GlfwCoreVideo> core_video_;
#endif
};
}  // namespace mujoco

#endif  // MUJOCO_SIMULATE_GLFW_ADAPTER_H_