#ifndef GPU_H
#define GPU_H

#define VK_USE_PLATFORM_MACOS_MVK
#include "vulkan/vk_enum_string_helper.h"
#include "vulkan/vulkan_core.h"

#include "vk_mem_alloc.h"

#define GLFW_INCLUDE_VULKAN
#include <GLFW/glfw3.h>

#ifdef __APPLE__
#define GLFW_EXPOSE_NATIVE_COCOA
#endif

#include <GLFW/glfw3native.h>

#define GLM_FORCE_RADIANS
#define GLM_FORCE_DEPTH_ZERO_TO_ONE
#include <cglm/types.h>
#include <cglm/mat4.h>
#include <cglm/vec3.h>
#include <cglm/affine.h>
#include <cglm/quat.h>
#include <cglm/cam.h>

#include <math.h>

#define MAX_FRAMES_IN_FLIGHT 2
#define WINDOW_MIN_WIDTH 800
#define WINDOW_MIN_HEIGHT 600
#define PERSPECTIVE_FOVY (-M_PI/3)
#define PERSPECTIVE_NEARZ 0.01
#define PERSPECTIVE_FARZ 1000

#define VK_RESULT(x) {\
  result = x;\
  if(result != VK_SUCCESS) {\
    fprintf(stderr, "%s:%d %s failed with %s\n", __FILE__, __LINE__, #x, string_VkResult(result));\
    return x;\
  }\
}

typedef struct ComputePipelineStruct {
  VkPipelineLayout layout;
  VkPipeline pipeline;
} ComputePipeline;

typedef struct GraphicsPipelineStruct {
  VkPipelineLayout       layout;
  VkPipeline             pipeline;
} GraphicsPipeline;

typedef struct DrawCommandStruct {
  uint32_t vertex_count;
  uint32_t instance_count;
  uint32_t first_vertex;
  uint32_t first_instance;
} DrawCommand;

typedef struct DispatchCommandStruct {
  uint32_t x;
  uint32_t y;
  uint32_t z;
} DispatchCommand;

typedef struct GPUQueueStruct {
  VkQueue handle;
  uint32_t family;
  uint32_t index;
} GPUQueue;

typedef struct SwapchainDetailsStruct {
  VkSurfaceCapabilitiesKHR capabilities;

  VkSurfaceFormatKHR* formats;
  uint32_t formats_count;

  VkPresentModeKHR* present_modes;
  uint32_t present_modes_count;
} SwapchainDetails;

typedef struct TransferInfoStruct {
  VkDeviceSize offset;
  VkDeviceSize size;
  VkBuffer     buffer;
} TransferInfo;

typedef struct TransferBufferStruct {
  VkBuffer        buffer;
  VmaAllocation   memory;
  void*           mapped;
  size_t          written;

  size_t          max_size;
  size_t          max_count;

  TransferInfo*   infos;
  uint32_t        count;
} TransferBuffer;

typedef struct FrameContextStruct {
  VkFence     ready;
  VkSemaphore image;
  VkSemaphore render;
  VkSemaphore transfer;
  VkSemaphore compute;

  uint64_t transfer_index;
  uint64_t compute_index;

  VkCommandBuffer compute_commands;
  VkCommandBuffer transfer_commands;

  TransferBuffer transfers[2];
} FrameContext;

typedef struct RenderContextStruct {
  VkInstance instance;
  VkDebugUtilsMessengerEXT debug_messenger;
  VkPhysicalDevice physical_device;
  VkSurfaceKHR surface;
  GPUQueue graphics_queue;
  GPUQueue present_queue;
  GPUQueue transfer_queue;
  VkDevice device;
  VmaAllocator allocator;

  SwapchainDetails swapchain_details;
  VkSurfaceFormatKHR swapchain_format;
  VkPresentModeKHR swapchain_present_mode;
  VkExtent2D swapchain_extent;
  VkSwapchainKHR swapchain;

  uint32_t swapchain_image_count;
  VkImage* swapchain_images;
  VkImageView* swapchain_image_views;
  VkFramebuffer* swapchain_framebuffers;

  VkFormat depth_format;
  VkImageView depth_image_view;
  VkImage depth_image;
  VmaAllocation depth_image_memory;

  VkCommandPool extra_graphics_pool;
  VkCommandPool graphics_pool;
  VkCommandPool transfer_pool;

  VkRenderPass render_pass;

  VkCommandBuffer* swapchain_command_buffers;
  uint64_t  swapchain_command_buffer_record_id;
  uint64_t* swapchain_command_buffer_record_ids;

  FrameContext frame[MAX_FRAMES_IN_FLIGHT];

  uint32_t current_frame;
  vec2 window_scale;

  bool framebuffer_recreated;
} RenderContext;

GLFWwindow* init_window();

VkResult init_vulkan(
    GLFWwindow* window,
    RenderContext* context);

VkResult create_transfer_buffer(
    VmaAllocator allocator,
    VkDeviceSize size,
    VkBuffer* buffer,
    VmaAllocation* memory,
    void** mapped);

void destroy_transfer_buffer(
    VmaAllocator allocator,
    VkBuffer buffer,
    VmaAllocation memory);

VkResult create_storage_buffer(
    VmaAllocator allocator,
    VkBufferUsageFlags usage,
    VkDeviceSize size,
    VkBuffer* buffer,
    VmaAllocation* memory);

VkDeviceAddress buffer_address(
    VkDevice device,
    VkBuffer buffer);

VkResult add_transfer(
    void* data,
    VkBuffer buffer,
    VkDeviceSize offset,
    VkDeviceSize size,
    uint32_t frame_index,
    RenderContext* gpu);

VkResult add_transfers(
    void* data,
    VkBuffer* buffers,
    VkDeviceSize offset,
    VkDeviceSize size,
    RenderContext* gpu);

VkCommandBuffer command_begin_single(
    VkDevice device,
    VkCommandPool transfer_pool);

VkResult command_end_single(
    VkDevice device,
    VkCommandBuffer command_buffer,
    VkCommandPool transfer_pool,
    GPUQueue transfer_queue);

void command_copy_buffer(
    VkCommandBuffer command_buffer,
    VkBuffer src,
    VkBuffer dst,
    VkDeviceSize src_offset,
    VkDeviceSize dst_offset,
    VkDeviceSize size);

VkResult command_transition_image_layout(
    VkDevice device,
    VkCommandPool transfer_pool,
    GPUQueue transfer_queue,
    VkImageLayout old_layout,
    VkImageLayout new_layout,
    VkImage image,
    VkAccessFlags src_mask,
    VkAccessFlags dst_mask,
    VkPipelineStageFlags source,
    VkPipelineStageFlags dest,
    uint32_t source_family,
    uint32_t dest_family,
    VkImageAspectFlags aspect_flags);

VkShaderModule load_shader_file(
    const char* path,
    VkDevice device);

VkResult recreate_framebuffer(
    RenderContext* gpu);

#endif