#pragma once
#include <vulkan/vulkan.h>

#include "buffer_handle.h"
#include "glfw/glfw_window.h"
#include "precomp.h"
#include "texture_handle.h"
#include "vertex.h"

namespace veng {

struct Frame {
  VkSemaphore image_available_signal = VK_NULL_HANDLE;
  VkSemaphore render_finished_signal = VK_NULL_HANDLE;
  VkFence still_rendering_fence = VK_NULL_HANDLE;

  VkCommandBuffer command_buffer = VK_NULL_HANDLE;

  VkDescriptorSet uniform_set = VK_NULL_HANDLE;
  BufferHandle uniform_buffer;
  void* uniform_buffer_location;
};

class Graphics final {
 public:
  Graphics(gsl::not_null<Window*> window);
  ~Graphics();

  bool BeginFrame();
  void SetModelMatrix(glm::mat4 model);
  void SetViewProjection(glm::mat4 view, glm::mat4 projection);
  void SetTexture(TextureHandle handle);
  void RenderBuffer(BufferHandle handle, std::uint32_t vertex_count);
  void RenderIndexedBuffer(BufferHandle vertex_buffer,
                           BufferHandle index_buffer, std::uint32_t count);
  void EndFrame();

  BufferHandle CreateVertexBuffer(gsl::span<Vertex> vertices);
  BufferHandle CreateIndexBuffer(gsl::span<std::uint32_t> indices);
  void DestroyBuffer(BufferHandle handle);
  TextureHandle CreateTexture(gsl::czstring path);
  TextureHandle CreateTexture(gsl::span<std::uint8_t> image_file_data);
  void DestroyTexture(TextureHandle handle);

 private:
  struct QueueFamilyIndices {
    std::optional<std::uint32_t> graphics_family = std::nullopt;
    std::optional<std::uint32_t> presentation_family = std::nullopt;

    bool IsValid() const {
      return graphics_family.has_value() && presentation_family.has_value();
    }
  };

  struct SwapChainProperties {
    VkSurfaceCapabilitiesKHR capabilities = {};
    std::vector<VkSurfaceFormatKHR> formats;
    std::vector<VkPresentModeKHR> present_modes;

    bool IsValid() const { return !formats.empty() && !present_modes.empty(); }
  };

  // 초기화

  void InitializeVulkan();
  void CreateInstance();
  void SetupDebugMessenger();
  void PickPhysicalDevice();
  void CreateLogicalDeviceAndQueues();
  void CreateSurface();
  void CreateSwapChain();
  void CreateImageViews();
  void CreateRenderPass();
  void CreateGraphicsPipeline();
  void CreateFramebuffers();
  void CreateCommandPool();
  void CreateCommandBuffer();
  void CreateSignals();
  void CreateDescriptorSetLayouts();
  void CreateDescriptorPools();
  void CreateDescriptorSets();
  void CreateTextureSampler();
  void CreateDepthResources();

  void RecreateSwapChain();
  void CleanupSwapChain();

  // 랜더링

  void BeginCommands();
  void EndCommands();

  std::vector<gsl::czstring> GetRequiredInstanceExtentions();

  static gsl::span<gsl::czstring> GetSuggestedInstanceExtentions();
  static std::vector<VkExtensionProperties> GetSupprotedInstanceExtensions();
  static bool AreAllExtensionsSupported(gsl::span<gsl::czstring> extensions);

  static std::vector<VkLayerProperties> GetSupprotedValidationLayers();
  static bool AreAllLayersSupported(gsl::span<gsl::czstring> extensions);

  QueueFamilyIndices FindQueueFamilies(VkPhysicalDevice device);
  SwapChainProperties GetSwapChainProperties(VkPhysicalDevice device);
  bool IsDeviceSuitable(VkPhysicalDevice device);
  std::vector<VkPhysicalDevice> GetAvailableDevices();
  bool AreAllDeviceExtensionsSupported(VkPhysicalDevice device);
  std::vector<VkExtensionProperties> GetDeviceAvailableExtensions(
      VkPhysicalDevice device);

  VkSurfaceFormatKHR ChooseSwapSurfaceFormat(
      gsl::span<VkSurfaceFormatKHR> formats);
  VkPresentModeKHR ChooseSwapPresentMode(
      gsl::span<VkPresentModeKHR> present_modes);
  VkExtent2D ChooseSwapExtent(const VkSurfaceCapabilitiesKHR& capabilities);
  std::uint32_t ChooseSwapImageCount(
      const VkSurfaceCapabilitiesKHR& capabilities);

  VkShaderModule CreateShaderModule(gsl::span<std::uint8_t> buffer);

  std::uint32_t FindMemoryType(std::uint32_t type_bits_filter,
                               VkMemoryPropertyFlags required_properties);

  BufferHandle CreateBuffer(VkDeviceSize size, VkBufferUsageFlags usage,
                            VkMemoryPropertyFlags properties);
  VkCommandBuffer BeginTransientCommandBuffer();
  void EndTransientCommandBuffer(VkCommandBuffer command_buffer);
  void CreateUniformBuffers();

  TextureHandle CreateImage(glm::ivec2 size, VkFormat image_format,
                            VkBufferUsageFlags usage,
                            VkMemoryPropertyFlags properties);
  void TransitionImageLayout(VkImage image, VkImageLayout old_layout,
                             VkImageLayout new_layout);
  void CopyBufferToImage(VkBuffer buffer, VkImage image, glm::ivec2 image_size);
  VkImageView CreateImageView(VkImage image, VkFormat format,
                              VkImageAspectFlags aspect_flag);

  VkViewport GetViewport();
  VkRect2D GetScissor();

  std::array<gsl::czstring, 1> required_device_extentions_ = {
      VK_KHR_SWAPCHAIN_EXTENSION_NAME};

  VkInstance instance_ = VK_NULL_HANDLE;
  VkDebugUtilsMessengerEXT debug_messenger_;

  VkPhysicalDevice physical_device_ = VK_NULL_HANDLE;
  VkDevice logical_device_ = VK_NULL_HANDLE;
  VkQueue graphics_queue_ = VK_NULL_HANDLE;
  VkQueue present_queue_ = VK_NULL_HANDLE;

  VkSurfaceKHR surface_ = VK_NULL_HANDLE;
  VkSwapchainKHR swap_chain_ = VK_NULL_HANDLE;
  VkSurfaceFormatKHR surface_format_;
  VkPresentModeKHR present_mode_;
  VkExtent2D extent_;

  std::vector<VkImage> swap_chain_images_;
  std::vector<VkImageView> swap_chain_image_views_;
  std::vector<VkFramebuffer> swap_chain_framebuffers_;

  VkPipelineLayout pipeline_layout_ = VK_NULL_HANDLE;
  VkRenderPass render_pass_ = VK_NULL_HANDLE;
  VkPipeline pipeline_ = VK_NULL_HANDLE;
  VkDescriptorSetLayout descriptor_set_layout_ = VK_NULL_HANDLE;

  VkCommandPool command_pool_ = VK_NULL_HANDLE;

  std::uint32_t current_image_index_ = 0;

  VkDescriptorSetLayout uniform_set_layout_ = VK_NULL_HANDLE;
  VkDescriptorPool uniform_pool_ = VK_NULL_HANDLE;
  

  VkDescriptorSetLayout texture_set_layout_ = VK_NULL_HANDLE;
  VkDescriptorPool texture_pool_ = VK_NULL_HANDLE;
  VkSampler texture_sampler_ = VK_NULL_HANDLE;
  TextureHandle depth_texture_;

  std::array<Frame, MAX_BUFFERED_FRAMES> frames_;
  std::int32_t current_frame_ = 0;

  gsl::not_null<Window*> window_;
  bool validation_enabled_ = false;
};

VkDebugUtilsMessengerCreateInfoEXT GetCreateMessengerInfo();
bool IsExtensionSupported(gsl::span<VkExtensionProperties> extensions,
                          gsl::czstring name);

}  // namespace veng