// vulkan_guide.h : Include file for standard system include files,
// or project specific include files.

#pragma once

#include <vk_types.h>

struct FrameData {
  VkCommandPool _commandPool;
  VkCommandBuffer _mainCommandBuffer;
  VkSemaphore _swapchainSemaphore;
  VkSemaphore _renderSemaphore;
  VkFence _renderFence;
};

constexpr unsigned int FRAME_OVERLAP=2;

class VulkanEngine {
public:
  // device selection
  VkInstance _instance;
  VkDebugUtilsMessengerEXT _debug_messenger;
  VkPhysicalDevice _chosenGPU;
  VkDevice _device;
  VkSurfaceKHR _surface;

  // swapchain
  VkSwapchainKHR _swapchain;
  VkFormat _swapchainImageFormat;

  std::vector<VkImage> _swapchainImages;
  std::vector<VkImageView> _swapchainImageViews;
  VkExtent2D _swapchainExtent;

  // frames/command buffer
  int _frameNumber {0};
  FrameData _frames[FRAME_OVERLAP];

  FrameData& get_current_frame() {
    return _frames[_frameNumber % FRAME_OVERLAP];
  }

  VkQueue _graphicsQueue;
  uint32_t _graphicsQueueFamily;

  // internal data
  bool _isInitialized{ false };

  VkExtent2D _windowExtent{ 1700 , 900 };

  struct SDL_Window* _window{ nullptr };

  static VulkanEngine& Get();

  //initializes everything in the engine
  void init();

  //shuts down the engine
  void cleanup();

  //draw loop
  void draw();

  //run main loop
  void run();

private:
  void init_vulkan();
  void init_swapchain();
  void init_commands();
  void init_sync_structures();

  void create_swapchain(uint32_t width, uint32_t height);
  void destroy_swapchain();
};