#include "rendering.h"
#include "tier0/platform.h"
#include "tier1/utlvector.h"
#include "console.h"
#include "tier1/commandline.h"
#include "input.h"

#define NS_PRIVATE_IMPLEMENTATION
#define MTL_PRIVATE_IMPLEMENTATION
#define MTK_PRIVATE_IMPLEMENTATION
#define CA_PRIVATE_IMPLEMENTATION

#include "tier0/minmax_off.h"
#include "QuartzCore/CAMetalLayer.hpp"
#include "Metal/Metal.hpp"

#include "SDL3/SDL.h"
#include "SDL3/SDL_keycode.h"
#include "SDL3/SDL_metal.h"
#include "SDL3/SDL_events.h"
#include "tier0/minmax.h"

char g_bConfigNotify = 0;
uint32_t g_nWindowWidth = 1280;
uint32_t g_nWindowHeight = 720;

SDL_Window *g_window;
SDL_MetalView g_mlView;
CA::MetalLayer *g_mlLayer;
MTL::Device *g_mlDevice;
MTL::CommandQueue *g_mlCommandQueue;
NS::AutoreleasePool *g_mlPool;

#if defined(__APPLE__) && defined(__MACH__)
#include "TargetConditionals.h"
#if TARGET_OS_IPHONE
// iOS
#define SDL_METAL_VIEW UI::View
#define STBI_NO_THREAD_LOCALS
#else
// macOS
#define SDL_METAL_VIEW NS::View
#endif
#else
// Other platforms
#endif

void IInput::SetMouseMode( EMouseMode mode )
{
	switch (mode)
	{
	case MOUSE_MODE_GAME:
		SDL_SetWindowRelativeMouseMode(g_window, true);
		return;
	default:
		SDL_SetWindowRelativeMouseMode(g_window, false);
		return;
	}
}

EInputKey ISDL_KeyName(SDL_Keycode key)
{
	switch(key)
	{
		case SDLK_ESCAPE: return KEY_ESCAPE;

		case SDLK_1: return KEY_1;
		case SDLK_2: return KEY_2;
		case SDLK_3: return KEY_3;
		case SDLK_4: return KEY_4;
		case SDLK_5: return KEY_5;
		case SDLK_6: return KEY_6;
		case SDLK_7: return KEY_7;
		case SDLK_8: return KEY_8;
		case SDLK_9: return KEY_9;
		case SDLK_0: return KEY_0;

		case SDLK_A: return KEY_A;
		case SDLK_B: return KEY_B;
		case SDLK_C: return KEY_C;
		case SDLK_D: return KEY_D;
		case SDLK_E: return KEY_E;
		case SDLK_F: return KEY_F;
		case SDLK_G: return KEY_G;
		case SDLK_H: return KEY_H;
		case SDLK_I: return KEY_I;
		case SDLK_J: return KEY_J;
		case SDLK_K: return KEY_K;
		case SDLK_L: return KEY_L;
		case SDLK_M: return KEY_M;
		case SDLK_N: return KEY_N;
		case SDLK_O: return KEY_O;
		case SDLK_P: return KEY_P;
		case SDLK_Q: return KEY_Q;
		case SDLK_R: return KEY_R;
		case SDLK_S: return KEY_S;
		case SDLK_T: return KEY_T;
		case SDLK_U: return KEY_U;
		case SDLK_V: return KEY_V;
		case SDLK_W: return KEY_W;
		case SDLK_X: return KEY_X;
		case SDLK_Y: return KEY_Y;
		case SDLK_Z: return KEY_Z;
	}
	return KEY_NONE;
};

void IVideo_HandleEvents()
{
	SDL_Event event;
	while (SDL_PollEvent(&event))
	{
		SDL_KeyboardEvent *key = &event.key;
		SDL_MouseMotionEvent *motion = &event.motion;
		switch (event.type)
		{
		case SDL_EVENT_WINDOW_RESIZED:	
			g_nWindowWidth = event.window.data1;
			g_nWindowHeight = event.window.data2;
			g_bConfigNotify = 2;
			break;
		case SDL_EVENT_KEY_DOWN:
			if (!key->repeat)
				IInput::KeyEvent(ISDL_KeyName(key->key),KEY_EVENT_TYPE_DOWN);
			break;
		case SDL_EVENT_KEY_UP:
			key = &event.key;
			if (!key->repeat)
				IInput::KeyEvent(ISDL_KeyName(key->key),KEY_EVENT_TYPE_UP);
			break;
		case SDL_EVENT_MOUSE_MOTION:
			IInput::AxisEvent(AXIS_MOUSE_X, motion->yrel*0.022);
			IInput::AxisEvent(AXIS_MOUSE_Y, -motion->xrel*0.022);
			break;
		}
	};
};

void IVideo::Init()
{
	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS);
	g_window = SDL_CreateWindow("rtt", 1280, 720, SDL_WINDOW_METAL);
	g_mlView = SDL_Metal_CreateView(g_window);
	g_mlLayer = (CA::MetalLayer*)SDL_Metal_GetLayer(g_mlView);

	g_mlDevice = MTL::CreateSystemDefaultDevice();

	g_mlLayer->setDevice(g_mlDevice);
	g_mlLayer->setPixelFormat(MTL::PixelFormatBGRA8Unorm);

	g_mlCommandQueue = g_mlDevice->newCommandQueue();
	
	g_mlLayer->setDrawableSize(CGSizeMake(1280, 720));
	
}	
void IVideo::Frame( float fDelta )
{
	IVideo_HandleEvents();
	
	NS::AutoreleasePool *pool = NS::AutoreleasePool::alloc()->init();
	int w, h;
	SDL_GetWindowSizeInPixels(g_window, &w, &h);
	g_mlLayer->setDrawableSize(CGSizeMake(w, h));

	CA::MetalDrawable *drawable = g_mlLayer->nextDrawable();
	if (!drawable)
		return;

	MTL::CommandBuffer *commandBuffer = g_mlCommandQueue->commandBuffer();

	MTL::RenderPassDescriptor *renderPass = MTL::RenderPassDescriptor::alloc()->init();
	renderPass->colorAttachments()->object(0)->setTexture(drawable->texture());
	renderPass->colorAttachments()->object(0)->setLoadAction(MTL::LoadActionClear);
	renderPass->colorAttachments()->object(0)->setStoreAction(MTL::StoreActionStore);
	renderPass->colorAttachments()->object(0)->setClearColor(MTL::ClearColor(0.0, 0, 1.0, 1.0));
	MTL::RenderCommandEncoder *renderEncoder = commandBuffer->renderCommandEncoder(renderPass);
	renderEncoder->endEncoding();

	commandBuffer->presentDrawable(drawable);
	commandBuffer->commit();
	pool->release();
}	

void IVideo::Deinit()
{
	g_mlCommandQueue->release();
	g_mlDevice->release();
};