#include "SDL3/SDL_error.h"
#include "igamewindow.h"
#include "tier1/interface.h"
#include "tier0/lib.h"
#include "tier0/platform.h"

#define SDL_MAIN_HANDLED
#include "SDL3/SDL.h"
#include "SDL3/SDL_init.h"
#include "SDL3/SDL_video.h"
#include "SDL3/SDL_vulkan.h"
#include "SDL3/SDL_events.h"


class CSDLGameWindow: public IGameWindow
{
public:
	virtual void Init() override;
	virtual void Shutdown() override;
	virtual void UpdateWindow() override;

	virtual EGraphicsAPI GetGraphicsAPI() override; 

	virtual int GetVulkanInstanceExtensionCount() override;
	virtual const char **GetVulkanInstanceExtensions() override;
	virtual void CreateVulkanSurface( void *pInstance ) override;
	virtual void DestroyVulkanSurface( void *pInstance ) override;
	virtual void *GetVulkanSurface() override;

private:
	SDL_Window *m_pWindow;
	EGraphicsAPI m_ePreferredGraphicsAPI;

	void *m_pVulkanSurface;
};

CSDLGameWindow g_sdlGameWindow;
IGameWindow *gamewindow = &g_sdlGameWindow;


void CSDLGameWindow::Init()
{
	m_ePreferredGraphicsAPI = GRAPHICS_API_VULKAN;

	if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS | SDL_INIT_GAMEPAD))
		Plat_FatalErrorFunc("SDL_Init: %s\n", SDL_GetError());

	m_pWindow = SDL_CreateWindow("funnygame", 1280, 720, SDL_WINDOW_VULKAN | SDL_WINDOW_RESIZABLE);
	if (!m_pWindow)
		Plat_FatalErrorFunc("SDL_CreateWindow: %s\n", SDL_GetError());
}

void CSDLGameWindow::Shutdown()
{

}

void CSDLGameWindow::UpdateWindow()
{
	SDL_Event event;
	while (SDL_PollEvent(&event))
	{
		switch (event.type)
		{
		case SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED:
			break;
		case SDL_EVENT_QUIT:
			SDL_Quit();
			Plat_Exit(0);
			break;
		default:
			break;
		}
	}
}
EGraphicsAPI CSDLGameWindow::GetGraphicsAPI()
{
	return GRAPHICS_API_VULKAN;
}

int CSDLGameWindow::GetVulkanInstanceExtensionCount()
{
	if ( m_ePreferredGraphicsAPI != GRAPHICS_API_VULKAN )
		return -1;

	uint32_t nCount;
	SDL_Vulkan_GetInstanceExtensions(&nCount);

	return nCount;
}

const char **CSDLGameWindow::GetVulkanInstanceExtensions()
{
	if ( m_ePreferredGraphicsAPI != GRAPHICS_API_VULKAN )
		return 0;

	uint32_t nCount;
	return (const char **)SDL_Vulkan_GetInstanceExtensions(&nCount);
}

void CSDLGameWindow::CreateVulkanSurface( void *pInstance )
{
	if ( m_ePreferredGraphicsAPI != GRAPHICS_API_VULKAN )
		return;

	SDL_Vulkan_CreateSurface(m_pWindow, (VkInstance)pInstance, NULL, (VkSurfaceKHR*)&m_pVulkanSurface);
}

void CSDLGameWindow::DestroyVulkanSurface( void *pInstance )
{
	SDL_Vulkan_DestroySurface((VkInstance)pInstance, (VkSurfaceKHR)m_pVulkanSurface, NULL);
}

void *CSDLGameWindow::GetVulkanSurface()
{
	if ( m_ePreferredGraphicsAPI != GRAPHICS_API_VULKAN )
		return 0;


	return m_pVulkanSurface;
}