#include "gui/gui.hpp"
#include "gui/gui_data.hpp"
#include "imgui.h"
#include "imgui_impl_glfw.h"
#include "imgui_impl_opengl3.h"
#include "imgui_impl_opengl3_loader.h"
#include "gui/window.hpp"

gui::Gui::Gui(gui::GuiData &data) : data(data), font("font/DejaVuSans.ttf") {
	SPDLOG_DEBUG("Creating GUI");
	(void) ImGui::CreateContext();
	ImGui::StyleColorsDark();
	(void) ImGui::GetIO().Fonts->AddFontFromFileTTF(font.c_str(), 18.0f);
	(void) ImGui_ImplGlfw_InitForOpenGL(data.get_window().get_window().get(), true);
	initialized = ImGui_ImplOpenGL3_Init();
	SPDLOG_DEBUG("Initialized: {}", initialized);
}

gui::Gui::~Gui() noexcept {
	ImGui_ImplOpenGL3_Shutdown();
	ImGui_ImplGlfw_Shutdown();
	ImGui::DestroyContext();
}

void gui::Gui::render_gui() {
	if (initialized) {
		constexpr ImGuiWindowFlags flags = ImGuiWindowFlags_NoMove |
										   ImGuiWindowFlags_NoResize |
										   ImGuiWindowFlags_NoCollapse |
										   ImGuiWindowFlags_NoTitleBar;

		ImGui_ImplOpenGL3_NewFrame();
		ImGui_ImplGlfw_NewFrame();
		ImGui::NewFrame();

		//TODO GUI
		{
			const ImGuiViewport &viewport = *ImGui::GetMainViewport();
			ImGui::SetNextWindowPos(viewport.Pos);
			ImGui::SetNextWindowSize(viewport.Size);
		}

		// Never collapsed.
		(void) ImGui::Begin("Billy", nullptr, flags);

		ImGui::Text("Hello world!");
		ImGui::Text("Average framerate: %.3f ms/frame (%.1f FPS)", 1000.f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);

		ImGui::End();

		ImGui::Render();
	}
}

void gui::Gui::render_gpu() const {
	if (initialized) {
		glClear(GL_COLOR_BUFFER_BIT);
		ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
	}
}