#include "Entrypoint/Common.hpp"
#include "Entrypoint/DirectX11.hpp"
#include "Entrypoint/DirectX12.hpp"
#include "Entrypoint/Metal.hpp"
#include "Entrypoint/OpenGL2.hpp"
#include "Entrypoint/OpenGL3.hpp"
#include "Entrypoint/Vulkan.hpp"

#include <glad/glad.h>

#include <GLFW/glfw3.h>
#include <imgui.h>
#include <argparse/argparse.hpp>
#include <iostream>
#include <memory>
#include <string>

using namespace std::literals::string_literals;

int main(int argc, char* argv[]) {
	argparse::ArgumentParser parser;
	parser.add_argument("--rendering-backend")
		.help("Which rendering backend to use. If equals 'default', the preferred API for each platform will be used")
		.default_value("default"s);

	try {
		parser.parse_args(argc, argv);
	} catch (const std::runtime_error& error) {
		std::cout << error.what() << '\n';
		std::cout << parser;
		return -1;
	}

	std::unique_ptr<RenderingBackend> backend;
	auto backendOption = parser.get<std::string>("--rendering-backend");
	if (backendOption == "default") {
		// TODO better api selection mechanism, use lower tier if higher tier is unavilable instead of bailing
#if PLATFORM_WIN32
#	if IMGUI_INCLUDE_DX12_BACKEND
		backend = std::make_unique<DirectX12Backend>();
#	elif IMGUI_INCLUDE_DX11_BACKEND
		backend = std::make_unique<DirectX11Backend>();
#	elif IMGUI_INCLUDE_VULKAN_BACKEND
		backend = std::make_unique<VulkanBackend>();
#	elif IMGUI_INCLUDE_OPENGL3_BACKEND
		backend = std::make_unique<OpenGL3Backend>();
#	elif IMGUI_INCLUDE_OPENGL2_BACKEND
		backend = std::make_unique<OpenGL2Backend>();
#	endif
#elif PLATFORM_MACOS
		backend = std::make_unique<MetalBackend>();
#elif PLATFORM_LINUX
#	if IMGUI_INCLUDE_VULKAN_BACKEND
		backend = std::make_unique<VulkanBackend>();
// #	elif IMGUI_INCLUDE_OPENGL3_BACKEND
// 		backend = std::make_unique<OpenGL3Backend>();
#	elif IMGUI_INCLUDE_OPENGL2_BACKEND
		backend = std::make_unique<OpenGL2Backend>();
#	endif
#endif
	} else if (backendOption == "opengl2") {
		backend = std::make_unique<OpenGL2Backend>();
	} else if (backendOption == "opengl3") {
		backend = std::make_unique<OpenGL3Backend>();
	} else if (backendOption == "vulkan") {
		backend = std::make_unique<VulkanBackend>();
	} else if (backendOption == "dx11") {
		backend = std::make_unique<DirectX11Backend>();
	} else if (backendOption == "dx12") {
		backend = std::make_unique<DirectX12Backend>();
	} else if (backendOption == "metal") {
		backend = std::make_unique<MetalBackend>();
	} else {
		std::cout << "Unknown backend '" << backendOption << "'.\n";
		return -1;
	}

	auto& io = ImGui::GetIO();
	io.Fonts->AddFontFromFileTTF("fonts/NotoSansSC-Regular.otf", 18, nullptr, io.Fonts->GetGlyphRangesChineseSimplifiedCommon());

	auto window = backend->GetWindow();
	bool showDemo = true;
	while (!glfwWindowShouldClose(window)) {
		backend->BeginFrame();
		if (showDemo)
			ImGui::ShowDemoWindow(&showDemo);
		backend->EndFrame();
	}

	return 0;
}