// Dear ImGui: standalone example application for GLFW + OpenGL 3, using programmable pipeline
// (GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan/Metal graphics context creation, etc.)
// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
// Read online: https://github.com/ocornut/imgui/tree/master/docs

#define IMGUI_INCLUDE_IMGUI_USER_H
#include "imgui.h"
#include "roboto_medium.h"
#include "fira_code.h"
#include "backends/imgui_impl_glfw.h"
#include "backends/imgui_impl_opengl3.h"
#include <stdio.h>
#define GL_SILENCE_DEPRECATION
#include <GLFW/glfw3.h>  // Will drag system OpenGL headers

#include "frontend/frontend.h"

static void glfw_error_callback(int error, const char *description)
{
	fprintf(stderr, "GLFW Error %d: %s\n", error, description);
}

// Main code
int main(int, char **)
{
	glfwSetErrorCallback(glfw_error_callback);
	if (!glfwInit())
		return 1;

	// Decide GL+GLSL versions
	// GL 3.0 + GLSL 130
	const char *glsl_version = "#version 130";
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);  // 3.2+ only
	glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);            // 3.0+ only

	// Create window with graphics context
	GLFWwindow *window = glfwCreateWindow(
	  1280, 720, "Dear ImGui GLFW+OpenGL3 example", nullptr, nullptr);
	if (window == nullptr)
		return 1;
	glfwMakeContextCurrent(window);
	glfwSwapInterval(1);  // Enable vsync

	// Setup Dear ImGui context
	IMGUI_CHECKVERSION();
	ImGui::CreateContext();
	ImGuiIO &io = ImGui::GetIO();
	(void)io;
	io.ConfigFlags |=
	  ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
	io.ConfigFlags &=
	  ~ImGuiConfigFlags_NavEnableGamepad;              // Disable Gamepad Controls
	io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;  // Enable Docking
	io.ConfigFlags &=
	  ~ImGuiConfigFlags_ViewportsEnable;  // Disable Multi-Viewport / Platform Windows
	//io.ConfigViewportsNoAutoMerge = true;
	//io.ConfigViewportsNoTaskBarIcon = true;

	// Setup Dear ImGui style
	ImGui::StyleColorsDark();
	//ImGui::StyleColorsLight();

	// When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
	ImGuiStyle &style = ImGui::GetStyle();
	if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
	{
		style.WindowRounding              = 0.0f;
		style.Colors[ImGuiCol_WindowBg].w = 1.0f;
	}

	// Setup Platform/Renderer backends
	ImGui_ImplGlfw_InitForOpenGL(window, true);
	ImGui_ImplOpenGL3_Init(glsl_version);

	// Load Fonts
	// - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
	// - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
	// - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
	// - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
	// - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
	// - Read 'docs/FONTS.md' for more instructions and details.
	// - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
	// - Our Emscripten build process allows embedding fonts to be accessible at runtime from the "fonts/" folder. See Makefile.emscripten for details.
	//io.Fonts->AddFontDefault();
	//io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\segoeui.ttf", 18.0f);
	//io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
	//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
	//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
	//ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
	//IM_ASSERT(font != nullptr);

	//io.Fonts->AddFontFromMemoryCompressedBase85TTF(
	//  roboto_medium_compressed_data_base85, 16.0f);

	io.Fonts->AddFontFromMemoryCompressedBase85TTF(
	  fira_code_compressed_data_base85, 16.0f);

	// Our state
	bool show_demo_window    = true;
	bool show_another_window = false;
	ImVec4 clear_color       = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);

	auto frontend = dbgui::frontend::Frontend{};

	// Main loop
	while (!glfwWindowShouldClose(window))
	{
		// Poll and handle events (inputs, window resize, etc.)
		// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
		// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data.
		// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data.
		// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
		glfwPollEvents();

		// Start the Dear ImGui frame
		ImGui_ImplOpenGL3_NewFrame();
		ImGui_ImplGlfw_NewFrame();
		ImGui::NewFrame();

		frontend.run_frame();

		// Rendering
		ImGui::Render();
		int display_w, display_h;
		glfwGetFramebufferSize(window, &display_w, &display_h);
		glViewport(0, 0, display_w, display_h);
		glClearColor(clear_color.x * clear_color.w, clear_color.y * clear_color.w,
		             clear_color.z * clear_color.w, clear_color.w);
		glClear(GL_COLOR_BUFFER_BIT);
		ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());

		// Update and Render additional Platform Windows
		// (Platform functions may change the current OpenGL context, so we save/restore it to make it easier to paste this code elsewhere.
		//  For this specific demo app we could also call glfwMakeContextCurrent(window) directly)
		if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
		{
			GLFWwindow *backup_current_context = glfwGetCurrentContext();
			ImGui::UpdatePlatformWindows();
			ImGui::RenderPlatformWindowsDefault();
			glfwMakeContextCurrent(backup_current_context);
		}

		glfwSwapBuffers(window);
	}

	// Cleanup
	ImGui_ImplOpenGL3_Shutdown();
	ImGui_ImplGlfw_Shutdown();
	ImGui::DestroyContext();

	glfwDestroyWindow(window);
	glfwTerminate();

	return 0;
}