#include <engine/graphics/graphics_context.hpp>
#include <engine/platform/graphics/opengl/graphics_context.hpp>

#ifdef LIGHT_PLATFORM_WINDOWS
	#include <engine/platform/graphics/directx/graphics_context.hpp>
	#include <engine/platform/graphics/directx/shared_context.hpp>
#endif

#include <engine/graphics/blender.hpp>              // required for forward declaratio>
#include <engine/graphics/buffers.hpp>              // required for forward declaratio>
#include <engine/graphics/render_command.hpp>       // required for forward declaratio>
#include <engine/graphics/renderer.hpp>             // required for forward declaratio>
#include <engine/user_interface/user_interface.hpp> // required for forward declaratio>
#include <engine/utils/resource_manager.hpp>

namespace Light {

GraphicsContext *GraphicsContext::s_Context = nullptr;

GraphicsContext::~GraphicsContext()
{
}

Scope<GraphicsContext> GraphicsContext::Create(GraphicsAPI api, GLFWwindow *windowHandle)
{
	// terminate 'GraphicsContext' dependent classes
	if (s_Context)
	{
		s_Context->m_Renderer.reset();
		s_Context->m_UserInterface.reset();

		delete s_Context;
	}

	// determine the default api
	if (api == GraphicsAPI::Default)
	{
#if defined(LIGHT_PLATFORM_WINDOWS)
		api = GraphicsAPI::DirectX;
#elif defined(LIGHT_PLATFORM_LINUX)
		api = GraphicsAPI::OpenGL;
#elif defined(LIGHT_PLATFORM_MAC)
		api = GraphicsAPI::OpenGL;
#endif
	}

	// create gfx context
	Scope<GraphicsContext> scopeGfx;
	switch (api)
	{
	// opengl
	case GraphicsAPI::OpenGL:
		scopeGfx = CreateScope<glGraphicsContext>(windowHandle);
		s_Context = scopeGfx.get();
		break;
	// directx
	case GraphicsAPI::DirectX:
		LT_WIN(scopeGfx = CreateScope<dxGraphicsContext>(windowHandle); s_Context = scopeGfx.get();
		       break;)

	default:
		ASSERT(
		    false,
		    "Invalid/unsupported 'GraphicsAPI' {}",
		    Stringifier::GraphicsAPIToString(api)
		);
		return nullptr;
	}

	// create 'GraphicsContext' dependent classes
	s_Context->m_UserInterface = UserInterface::Create(windowHandle, s_Context->m_SharedContext);
	s_Context->m_Renderer = Renderer::Create(windowHandle, s_Context->m_SharedContext);

	// check
	ASSERT(s_Context->m_UserInterface, "Failed to create UserInterface");
	ASSERT(s_Context->m_Renderer, "Failed to create Renderer");

	return std::move(scopeGfx);
}

} // namespace Light