#include "imgui-SFML.h"
#include "../imgui/imgui.h"

#include <SFML/Config.hpp>
#include <SFML/Graphics/Color.hpp>
#include <SFML/Graphics/RenderTarget.hpp>
#include <SFML/Graphics/RenderTexture.hpp>
#include <SFML/Graphics/RenderWindow.hpp>
#include <SFML/Graphics/Sprite.hpp>
#include <SFML/Graphics/Texture.hpp>
#include <SFML/OpenGL.hpp>
#include <SFML/Window/Clipboard.hpp>
#include <SFML/Window/Cursor.hpp>
#include <SFML/Window/Event.hpp>
#include <SFML/Window/Touch.hpp>
#include <SFML/Window/Window.hpp>

#include <cassert>
#include <cmath>   // abs
#include <cstddef> // offsetof, NULL, size_t
#include <cstdint> // uint8_t
#include <cstring> // memcpy

#include <algorithm>
#include <memory>
#include <vector>

#if defined(__APPLE__)
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif

#if SFML_VERSION_MAJOR >= 3
#define IMGUI_SFML_KEY_APOSTROPHE sf::Keyboard::Apostrophe
#define IMGUI_SFML_KEY_GRAVE      sf::Keyboard::Grave
#else
#define IMGUI_SFML_KEY_APOSTROPHE sf::Keyboard::Quote
#define IMGUI_SFML_KEY_GRAVE      sf::Keyboard::Tilde
#endif

#ifdef ANDROID
#ifdef USE_JNI

#include <SFML/System/NativeActivity.hpp>
#include <android/native_activity.h>
#include <jni.h>

int openKeyboardIME() {
	ANativeActivity *activity = sf::getNativeActivity();
	JavaVM          *vm       = activity->vm;
	JNIEnv          *env      = activity->env;
	JavaVMAttachArgs attachargs;
	attachargs.version = JNI_VERSION_1_6;
	attachargs.name    = "NativeThread";
	attachargs.group   = NULL;
	jint res           = vm->AttachCurrentThread(&env, &attachargs);
	if (res == JNI_ERR)
		return EXIT_FAILURE;

	jclass natact  = env->FindClass("android/app/NativeActivity");
	jclass context = env->FindClass("android/content/Context");

	jfieldID fid    = env->GetStaticFieldID(context, "INPUT_METHOD_SERVICE", "Ljava/lang/String;");
	jobject  svcstr = env->GetStaticObjectField(context, fid);

	jmethodID getss =
		env->GetMethodID(natact, "getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;");
	jobject imm_obj = env->CallObjectMethod(activity->clazz, getss, svcstr);

	jclass    imm_cls         = env->GetObjectClass(imm_obj);
	jmethodID toggleSoftInput = env->GetMethodID(imm_cls, "toggleSoftInput", "(II)V");

	env->CallVoidMethod(imm_obj, toggleSoftInput, 2, 0);

	env->DeleteLocalRef(imm_obj);
	env->DeleteLocalRef(imm_cls);
	env->DeleteLocalRef(svcstr);
	env->DeleteLocalRef(context);
	env->DeleteLocalRef(natact);

	vm->DetachCurrentThread();

	return EXIT_SUCCESS;
}

int closeKeyboardIME() {
	ANativeActivity *activity = sf::getNativeActivity();
	JavaVM          *vm       = activity->vm;
	JNIEnv          *env      = activity->env;
	JavaVMAttachArgs attachargs;
	attachargs.version = JNI_VERSION_1_6;
	attachargs.name    = "NativeThread";
	attachargs.group   = NULL;
	jint res           = vm->AttachCurrentThread(&env, &attachargs);
	if (res == JNI_ERR)
		return EXIT_FAILURE;

	jclass natact  = env->FindClass("android/app/NativeActivity");
	jclass context = env->FindClass("android/content/Context");

	jfieldID fid    = env->GetStaticFieldID(context, "INPUT_METHOD_SERVICE", "Ljava/lang/String;");
	jobject  svcstr = env->GetStaticObjectField(context, fid);

	jmethodID getss =
		env->GetMethodID(natact, "getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;");
	jobject imm_obj = env->CallObjectMethod(activity->clazz, getss, svcstr);

	jclass    imm_cls         = env->GetObjectClass(imm_obj);
	jmethodID toggleSoftInput = env->GetMethodID(imm_cls, "toggleSoftInput", "(II)V");

	env->CallVoidMethod(imm_obj, toggleSoftInput, 1, 0);

	env->DeleteLocalRef(imm_obj);
	env->DeleteLocalRef(imm_cls);
	env->DeleteLocalRef(svcstr);
	env->DeleteLocalRef(context);
	env->DeleteLocalRef(natact);

	vm->DetachCurrentThread();

	return EXIT_SUCCESS;
}

#endif
#endif

#if __cplusplus >= 201103L // C++11 and above
static_assert(sizeof(GLuint) <= sizeof(ImTextureID), "ImTextureID is not large enough to fit GLuint.");
#endif

namespace {
// various helper functions
ImColor toImColor(sf::Color c);
ImVec2  getTopLeftAbsolute(const sf::FloatRect &rect);
ImVec2  getDownRightAbsolute(const sf::FloatRect &rect);

ImTextureID convertGLTextureHandleToImTextureID(GLuint glTextureHandle);
GLuint      convertImTextureIDToGLTextureHandle(ImTextureID textureID);

void RenderDrawLists(ImDrawData *draw_data); // rendering callback function prototype

// Default mapping is XInput gamepad mapping
void initDefaultJoystickMapping();

// Returns first id of connected joystick
unsigned int getConnectedJoystickId();

void updateJoystickButtonState(ImGuiIO &io);
void updateJoystickDPadState(ImGuiIO &io);
void updateJoystickAxisState(ImGuiIO &io);

// clipboard functions
void        setClipboardText(void *userData, const char *text);
const char *getClipboardText(void *userData);
std::string s_clipboardText;

// mouse cursors
void loadMouseCursor(ImGuiMouseCursor imguiCursorType, sf::Cursor::Type sfmlCursorType);
void updateMouseCursor(sf::Window &window);

// data
constexpr unsigned int NULL_JOYSTICK_ID = sf::Joystick::Count;

struct StickInfo {
	sf::Joystick::Axis xAxis;
	sf::Joystick::Axis yAxis;

	bool xInverted;
	bool yInverted;

	float threshold;

	StickInfo() {
		xAxis     = sf::Joystick::X;
		yAxis     = sf::Joystick::Y;
		xInverted = false;
		yInverted = false;
		threshold = 15;
	}
};

struct TriggerInfo {
	sf::Joystick::Axis axis;
	float              threshold;

	TriggerInfo() {
		axis      = sf::Joystick::Z;
		threshold = 0;
	}
};

struct WindowContext {
	const sf::Window *window;
	ImGuiContext     *imContext;

	sf::Texture fontTexture; // internal font atlas which is used if user doesn't set a custom
							 // sf::Texture.

	bool             windowHasFocus;
	bool             mouseMoved;
	bool             mousePressed[3];
	ImGuiMouseCursor lastCursor;

	bool         touchDown[3];
	sf::Vector2i touchPos;

	unsigned int joystickId;
	ImGuiKey     joystickMapping[sf::Joystick::ButtonCount];
	StickInfo    dPadInfo;
	StickInfo    lStickInfo;
	StickInfo    rStickInfo;
	TriggerInfo  lTriggerInfo;
	TriggerInfo  rTriggerInfo;

	sf::Cursor mouseCursors[ImGuiMouseCursor_COUNT];
	bool       mouseCursorLoaded[ImGuiMouseCursor_COUNT];

#ifdef ANDROID
#ifdef USE_JNI
	bool wantTextInput;
#endif
#endif

	WindowContext(const WindowContext &)            = delete; // non construction-copyable
	WindowContext &operator=(const WindowContext &) = delete; // non copyable

	WindowContext(const sf::Window *w) {
		window    = w;
		imContext = ImGui::CreateContext();

		windowHasFocus = window->hasFocus();
		mouseMoved     = false;
		for (int i = 0; i < 3; ++i) {
			mousePressed[i] = false;
			touchDown[i]    = false;
		}
		lastCursor = ImGuiMouseCursor_COUNT;

		joystickId = getConnectedJoystickId();
		for (int i = 0; i < static_cast<int>(sf::Joystick::ButtonCount); ++i) {
			joystickMapping[i] = ImGuiKey_None;
		}

		for (int i = 0; i < ImGuiMouseCursor_COUNT; ++i) {
			mouseCursorLoaded[i] = false;
		}

#ifdef ANDROID
#ifdef USE_JNI
		wantTextInput = false;
#endif
#endif
	}

	~WindowContext() { ImGui::DestroyContext(imContext); }
};

std::vector<std::unique_ptr<WindowContext>> s_windowContexts;
WindowContext                              *s_currWindowCtx = nullptr;

} // end of anonymous namespace

namespace ImGui {
namespace SFML {
bool Init(sf::RenderWindow &window, bool loadDefaultFont) {
	return Init(window, window, loadDefaultFont);
}

bool Init(sf::Window &window, sf::RenderTarget &target, bool loadDefaultFont) {
	return Init(window, static_cast<sf::Vector2f>(target.getSize()), loadDefaultFont);
}

bool Init(sf::Window &window, const sf::Vector2f &displaySize, bool loadDefaultFont) {
#if __cplusplus < 201103L                          // runtime assert when using earlier than C++11 as no
												   // static_assert support
	assert(sizeof(GLuint) <= sizeof(ImTextureID)); // ImTextureID is not large enough to fit
												   // GLuint.
#endif

	s_windowContexts.emplace_back(new WindowContext(&window));

	s_currWindowCtx = s_windowContexts.back().get();
	ImGui::SetCurrentContext(s_currWindowCtx->imContext);

	ImGuiIO &io = ImGui::GetIO();

	// tell ImGui which features we support
	io.BackendFlags |= ImGuiBackendFlags_HasGamepad;
	io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors;
	io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos;
	io.BackendPlatformName = "imgui_impl_sfml";

	s_currWindowCtx->joystickId = getConnectedJoystickId();

	initDefaultJoystickMapping();

	// init rendering
	io.DisplaySize = ImVec2(displaySize.x, displaySize.y);

	// clipboard
	io.SetClipboardTextFn = setClipboardText;
	io.GetClipboardTextFn = getClipboardText;

	// load mouse cursors
	loadMouseCursor(ImGuiMouseCursor_Arrow, sf::Cursor::Arrow);
	loadMouseCursor(ImGuiMouseCursor_TextInput, sf::Cursor::Text);
	loadMouseCursor(ImGuiMouseCursor_ResizeAll, sf::Cursor::SizeAll);
	loadMouseCursor(ImGuiMouseCursor_ResizeNS, sf::Cursor::SizeVertical);
	loadMouseCursor(ImGuiMouseCursor_ResizeEW, sf::Cursor::SizeHorizontal);
	loadMouseCursor(ImGuiMouseCursor_ResizeNESW, sf::Cursor::SizeBottomLeftTopRight);
	loadMouseCursor(ImGuiMouseCursor_ResizeNWSE, sf::Cursor::SizeTopLeftBottomRight);
	loadMouseCursor(ImGuiMouseCursor_Hand, sf::Cursor::Hand);

	if (loadDefaultFont) {
		// this will load default font automatically
		// No need to call AddDefaultFont
		return UpdateFontTexture();
	}

	return true;
}

void SetCurrentWindow(const sf::Window &window) {
	auto found = std::find_if(s_windowContexts.begin(), s_windowContexts.end(), [&](std::unique_ptr<WindowContext> &ctx) {
		return ctx->window->getSystemHandle() == window.getSystemHandle();
	});
	assert(found != s_windowContexts.end() && "Failed to find the window. Forgot to call ImGui::SFML::Init for the window?");
	s_currWindowCtx = found->get();
	ImGui::SetCurrentContext(s_currWindowCtx->imContext);
}

void ProcessEvent(const sf::Window &window, const sf::Event &event) {
	SetCurrentWindow(window);
	ProcessEvent(event);
}

ImGuiKey keycodeToImGuiKey(sf::Keyboard::Key code) {
	switch (code) {
		case sf::Keyboard::Tab:
			return ImGuiKey_Tab;
		case sf::Keyboard::Left:
			return ImGuiKey_LeftArrow;
		case sf::Keyboard::Right:
			return ImGuiKey_RightArrow;
		case sf::Keyboard::Up:
			return ImGuiKey_UpArrow;
		case sf::Keyboard::Down:
			return ImGuiKey_DownArrow;
		case sf::Keyboard::PageUp:
			return ImGuiKey_PageUp;
		case sf::Keyboard::PageDown:
			return ImGuiKey_PageDown;
		case sf::Keyboard::Home:
			return ImGuiKey_Home;
		case sf::Keyboard::End:
			return ImGuiKey_End;
		case sf::Keyboard::Insert:
			return ImGuiKey_Insert;
		case sf::Keyboard::Delete:
			return ImGuiKey_Delete;
		case sf::Keyboard::Backspace:
			return ImGuiKey_Backspace;
		case sf::Keyboard::Space:
			return ImGuiKey_Space;
		case sf::Keyboard::Enter:
			return ImGuiKey_Enter;
		case sf::Keyboard::Escape:
			return ImGuiKey_Escape;
		case IMGUI_SFML_KEY_APOSTROPHE:
			return ImGuiKey_Apostrophe;
		case sf::Keyboard::Comma:
			return ImGuiKey_Comma;
		case sf::Keyboard::Hyphen:
			return ImGuiKey_Minus;
		case sf::Keyboard::Period:
			return ImGuiKey_Period;
		case sf::Keyboard::Slash:
			return ImGuiKey_Slash;
		case sf::Keyboard::Semicolon:
			return ImGuiKey_Semicolon;
		case sf::Keyboard::Equal:
			return ImGuiKey_Equal;
		case sf::Keyboard::LBracket:
			return ImGuiKey_LeftBracket;
		case sf::Keyboard::Backslash:
			return ImGuiKey_Backslash;
		case sf::Keyboard::RBracket:
			return ImGuiKey_RightBracket;
		case IMGUI_SFML_KEY_GRAVE:
			return ImGuiKey_GraveAccent;
		// case : return ImGuiKey_CapsLock;
		// case : return ImGuiKey_ScrollLock;
		// case : return ImGuiKey_NumLock;
		// case : return ImGuiKey_PrintScreen;
		case sf::Keyboard::Pause:
			return ImGuiKey_Pause;
		case sf::Keyboard::Numpad0:
			return ImGuiKey_Keypad0;
		case sf::Keyboard::Numpad1:
			return ImGuiKey_Keypad1;
		case sf::Keyboard::Numpad2:
			return ImGuiKey_Keypad2;
		case sf::Keyboard::Numpad3:
			return ImGuiKey_Keypad3;
		case sf::Keyboard::Numpad4:
			return ImGuiKey_Keypad4;
		case sf::Keyboard::Numpad5:
			return ImGuiKey_Keypad5;
		case sf::Keyboard::Numpad6:
			return ImGuiKey_Keypad6;
		case sf::Keyboard::Numpad7:
			return ImGuiKey_Keypad7;
		case sf::Keyboard::Numpad8:
			return ImGuiKey_Keypad8;
		case sf::Keyboard::Numpad9:
			return ImGuiKey_Keypad9;
		// case : return ImGuiKey_KeypadDecimal;
		case sf::Keyboard::Divide:
			return ImGuiKey_KeypadDivide;
		case sf::Keyboard::Multiply:
			return ImGuiKey_KeypadMultiply;
		case sf::Keyboard::Subtract:
			return ImGuiKey_KeypadSubtract;
		case sf::Keyboard::Add:
			return ImGuiKey_KeypadAdd;
		// case : return ImGuiKey_KeypadEnter;
		// case : return ImGuiKey_KeypadEqual;
		case sf::Keyboard::LControl:
			return ImGuiKey_LeftCtrl;
		case sf::Keyboard::LShift:
			return ImGuiKey_LeftShift;
		case sf::Keyboard::LAlt:
			return ImGuiKey_LeftAlt;
		case sf::Keyboard::LSystem:
			return ImGuiKey_LeftSuper;
		case sf::Keyboard::RControl:
			return ImGuiKey_RightCtrl;
		case sf::Keyboard::RShift:
			return ImGuiKey_RightShift;
		case sf::Keyboard::RAlt:
			return ImGuiKey_RightAlt;
		case sf::Keyboard::RSystem:
			return ImGuiKey_RightSuper;
		case sf::Keyboard::Menu:
			return ImGuiKey_Menu;
		case sf::Keyboard::Num0:
			return ImGuiKey_0;
		case sf::Keyboard::Num1:
			return ImGuiKey_1;
		case sf::Keyboard::Num2:
			return ImGuiKey_2;
		case sf::Keyboard::Num3:
			return ImGuiKey_3;
		case sf::Keyboard::Num4:
			return ImGuiKey_4;
		case sf::Keyboard::Num5:
			return ImGuiKey_5;
		case sf::Keyboard::Num6:
			return ImGuiKey_6;
		case sf::Keyboard::Num7:
			return ImGuiKey_7;
		case sf::Keyboard::Num8:
			return ImGuiKey_8;
		case sf::Keyboard::Num9:
			return ImGuiKey_9;
		case sf::Keyboard::A:
			return ImGuiKey_A;
		case sf::Keyboard::B:
			return ImGuiKey_B;
		case sf::Keyboard::C:
			return ImGuiKey_C;
		case sf::Keyboard::D:
			return ImGuiKey_D;
		case sf::Keyboard::E:
			return ImGuiKey_E;
		case sf::Keyboard::F:
			return ImGuiKey_F;
		case sf::Keyboard::G:
			return ImGuiKey_G;
		case sf::Keyboard::H:
			return ImGuiKey_H;
		case sf::Keyboard::I:
			return ImGuiKey_I;
		case sf::Keyboard::J:
			return ImGuiKey_J;
		case sf::Keyboard::K:
			return ImGuiKey_K;
		case sf::Keyboard::L:
			return ImGuiKey_L;
		case sf::Keyboard::M:
			return ImGuiKey_M;
		case sf::Keyboard::N:
			return ImGuiKey_N;
		case sf::Keyboard::O:
			return ImGuiKey_O;
		case sf::Keyboard::P:
			return ImGuiKey_P;
		case sf::Keyboard::Q:
			return ImGuiKey_Q;
		case sf::Keyboard::R:
			return ImGuiKey_R;
		case sf::Keyboard::S:
			return ImGuiKey_S;
		case sf::Keyboard::T:
			return ImGuiKey_T;
		case sf::Keyboard::U:
			return ImGuiKey_U;
		case sf::Keyboard::V:
			return ImGuiKey_V;
		case sf::Keyboard::W:
			return ImGuiKey_W;
		case sf::Keyboard::X:
			return ImGuiKey_X;
		case sf::Keyboard::Y:
			return ImGuiKey_Y;
		case sf::Keyboard::Z:
			return ImGuiKey_Z;
		case sf::Keyboard::F1:
			return ImGuiKey_F1;
		case sf::Keyboard::F2:
			return ImGuiKey_F2;
		case sf::Keyboard::F3:
			return ImGuiKey_F3;
		case sf::Keyboard::F4:
			return ImGuiKey_F4;
		case sf::Keyboard::F5:
			return ImGuiKey_F5;
		case sf::Keyboard::F6:
			return ImGuiKey_F6;
		case sf::Keyboard::F7:
			return ImGuiKey_F7;
		case sf::Keyboard::F8:
			return ImGuiKey_F8;
		case sf::Keyboard::F9:
			return ImGuiKey_F9;
		case sf::Keyboard::F10:
			return ImGuiKey_F10;
		case sf::Keyboard::F11:
			return ImGuiKey_F11;
		case sf::Keyboard::F12:
			return ImGuiKey_F12;
		default:
			break;
	}
	return ImGuiKey_None;
}

ImGuiKey keycodeToImGuiMod(sf::Keyboard::Key code) {
	switch (code) {
		case sf::Keyboard::LControl:
		case sf::Keyboard::RControl:
			return ImGuiKey_ModCtrl;
		case sf::Keyboard::LShift:
		case sf::Keyboard::RShift:
			return ImGuiKey_ModShift;
		case sf::Keyboard::LAlt:
		case sf::Keyboard::RAlt:
			return ImGuiKey_ModAlt;
		case sf::Keyboard::LSystem:
		case sf::Keyboard::RSystem:
			return ImGuiKey_ModSuper;
		default:
			break;
	}
	return ImGuiKey_None;
}

void ProcessEvent(const sf::Event &event) {
	assert(s_currWindowCtx && "No current window is set - forgot to call ImGui::SFML::Init?");
	ImGuiIO &io = ImGui::GetIO();

	if (s_currWindowCtx->windowHasFocus) {
		switch (event.type) {
			case sf::Event::Resized:
				io.DisplaySize =
					ImVec2(static_cast<float>(event.size.width), static_cast<float>(event.size.height));
				break;
			case sf::Event::MouseMoved:
				io.AddMousePosEvent(static_cast<float>(event.mouseMove.x), static_cast<float>(event.mouseMove.y));
				s_currWindowCtx->mouseMoved = true;
				break;
			case sf::Event::MouseButtonPressed: // fall-through
			case sf::Event::MouseButtonReleased: {
				int button = event.mouseButton.button;
				if (button >= 0 && button < 3) {
					if (event.type == sf::Event::MouseButtonPressed) {
						s_currWindowCtx->mousePressed[event.mouseButton.button] = true;
						io.AddMouseButtonEvent(button, true);
					} else {
						io.AddMouseButtonEvent(button, false);
					}
				}
			} break;
			case sf::Event::TouchBegan: // fall-through
			case sf::Event::TouchEnded: {
				s_currWindowCtx->mouseMoved = false;
				unsigned int button         = event.touch.finger;
				if (event.type == sf::Event::TouchBegan && button < 3) {
					s_currWindowCtx->touchDown[event.touch.finger] = true;
				}
			} break;
			case sf::Event::MouseWheelScrolled:
				if (event.mouseWheelScroll.wheel == sf::Mouse::VerticalWheel ||
					(event.mouseWheelScroll.wheel == sf::Mouse::HorizontalWheel && io.KeyShift)) {
					io.AddMouseWheelEvent(0, event.mouseWheelScroll.delta);
				} else if (event.mouseWheelScroll.wheel == sf::Mouse::HorizontalWheel) {
					io.AddMouseWheelEvent(event.mouseWheelScroll.delta, 0);
				}
				break;
			case sf::Event::KeyPressed: // fall-through
			case sf::Event::KeyReleased: {
				bool down = (event.type == sf::Event::KeyPressed);

				ImGuiKey mod = keycodeToImGuiMod(event.key.code);
				// The modifier booleans are not reliable when it's the modifier
				// itself that's being pressed. Detect these presses directly.
				if (mod != ImGuiKey_None) {
					io.AddKeyEvent(mod, down);
				} else {
					io.AddKeyEvent(ImGuiKey_ModCtrl, event.key.control);
					io.AddKeyEvent(ImGuiKey_ModShift, event.key.shift);
					io.AddKeyEvent(ImGuiKey_ModAlt, event.key.alt);
					io.AddKeyEvent(ImGuiKey_ModSuper, event.key.system);
				}

				ImGuiKey key = keycodeToImGuiKey(event.key.code);
				io.AddKeyEvent(key, down);
				io.SetKeyEventNativeData(key, event.key.code, -1);
			} break;
			case sf::Event::TextEntered:
				// Don't handle the event for unprintable characters
				if (event.text.unicode < ' ' || event.text.unicode == 127) {
					break;
				}
				io.AddInputCharacter(event.text.unicode);
				break;
			case sf::Event::JoystickConnected:
				if (s_currWindowCtx->joystickId == NULL_JOYSTICK_ID) {
					s_currWindowCtx->joystickId = event.joystickConnect.joystickId;
				}
				break;
			case sf::Event::JoystickDisconnected:
				if (s_currWindowCtx->joystickId == event.joystickConnect.joystickId) { // used gamepad
																					   // was
																					   // disconnected
					s_currWindowCtx->joystickId = getConnectedJoystickId();
				}
				break;
			default:
				break;
		}
	}

	switch (event.type) {
		case sf::Event::LostFocus: {
			io.AddFocusEvent(false);
			s_currWindowCtx->windowHasFocus = false;
		} break;
		case sf::Event::GainedFocus:
			io.AddFocusEvent(true);
			s_currWindowCtx->windowHasFocus = true;
			break;
		default:
			break;
	}
}

void Update(sf::RenderWindow &window, sf::Time dt) {
	Update(window, window, dt);
}

void Update(sf::Window &window, sf::RenderTarget &target, sf::Time dt) {
	SetCurrentWindow(window);
	assert(s_currWindowCtx);

	// Update OS/hardware mouse cursor if imgui isn't drawing a software cursor
	ImGuiMouseCursor mouse_cursor =
		ImGui::GetIO().MouseDrawCursor ? ImGuiMouseCursor_None : ImGui::GetMouseCursor();
	if (s_currWindowCtx->lastCursor != mouse_cursor) {
		s_currWindowCtx->lastCursor = mouse_cursor;
		updateMouseCursor(window);
	}

	if (!s_currWindowCtx->mouseMoved) {
		if (sf::Touch::isDown(0))
			s_currWindowCtx->touchPos = sf::Touch::getPosition(0, window);

		Update(s_currWindowCtx->touchPos, static_cast<sf::Vector2f>(target.getSize()), dt);
	} else {
		Update(sf::Mouse::getPosition(window), static_cast<sf::Vector2f>(target.getSize()), dt);
	}
}

void Update(const sf::Vector2i &mousePos, const sf::Vector2f &displaySize, sf::Time dt) {
	assert(s_currWindowCtx && "No current window is set - forgot to call ImGui::SFML::Init?");

	ImGuiIO &io    = ImGui::GetIO();
	io.DisplaySize = ImVec2(displaySize.x, displaySize.y);
	io.DeltaTime   = dt.asSeconds();

	if (s_currWindowCtx->windowHasFocus) {
		if (io.WantSetMousePos) {
			sf::Vector2i newMousePos(static_cast<int>(io.MousePos.x), static_cast<int>(io.MousePos.y));
			sf::Mouse::setPosition(newMousePos);
		} else {
			io.MousePos = ImVec2(static_cast<float>(mousePos.x), static_cast<float>(mousePos.y));
		}
		for (unsigned int i = 0; i < 3; i++) {
			io.MouseDown[i] = s_currWindowCtx->touchDown[i] || sf::Touch::isDown(i) ||
							  s_currWindowCtx->mousePressed[i] ||
							  sf::Mouse::isButtonPressed((sf::Mouse::Button)i);
			s_currWindowCtx->mousePressed[i] = false;
			s_currWindowCtx->touchDown[i]    = false;
		}
	}

#ifdef ANDROID
#ifdef USE_JNI
	if (io.WantTextInput && !s_currWindowCtx->wantTextInput) {
		openKeyboardIME();
		s_currWindowCtx->wantTextInput = true;
	}

	if (!io.WantTextInput && s_currWindowCtx->wantTextInput) {
		closeKeyboardIME();
		s_currWindowCtx->wantTextInput = false;
	}
#endif
#endif

	assert(io.Fonts->Fonts.Size > 0); // You forgot to create and set up font
									  // atlas (see createFontTexture)

	// gamepad navigation
	if ((io.ConfigFlags & ImGuiConfigFlags_NavEnableGamepad) &&
		s_currWindowCtx->joystickId != NULL_JOYSTICK_ID) {
		updateJoystickButtonState(io);
		updateJoystickDPadState(io);
		updateJoystickAxisState(io);
	}

	ImGui::NewFrame();
}

void Render(sf::RenderWindow &window) {
	SetCurrentWindow(window);
	Render(static_cast<sf::RenderTarget &>(window));
}

void Render(sf::RenderTarget &target) {
	target.resetGLStates();
	target.pushGLStates();
	ImGui::Render();
	RenderDrawLists(ImGui::GetDrawData());
	target.popGLStates();
}

void Render() {
	ImGui::Render();
	RenderDrawLists(ImGui::GetDrawData());
}

void Shutdown(const sf::Window &window) {
	bool needReplacement = (s_currWindowCtx->window->getSystemHandle() == window.getSystemHandle());

	// remove window's context
	auto found = std::find_if(s_windowContexts.begin(), s_windowContexts.end(), [&](std::unique_ptr<WindowContext> &ctx) {
		return ctx->window->getSystemHandle() == window.getSystemHandle();
	});
	assert(found != s_windowContexts.end() && "Window wasn't inited properly: forgot to call ImGui::SFML::Init(window)?");
	s_windowContexts.erase(found); // s_currWindowCtx can become invalid here!

	// set current context to some window for convenience if needed
	if (needReplacement) {
		auto it = s_windowContexts.begin();
		if (it != s_windowContexts.end()) {
			// set to some other window
			s_currWindowCtx = it->get();
			ImGui::SetCurrentContext(s_currWindowCtx->imContext);
		} else {
			// no alternatives...
			s_currWindowCtx = nullptr;
			ImGui::SetCurrentContext(nullptr);
		}
	}
}

void Shutdown() {
	s_currWindowCtx = nullptr;
	ImGui::SetCurrentContext(nullptr);

	s_windowContexts.clear();
}

bool UpdateFontTexture() {
	assert(s_currWindowCtx);

	ImGuiIO       &io = ImGui::GetIO();
	unsigned char *pixels;
	int            width, height;

	io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);

	sf::Texture &texture = s_currWindowCtx->fontTexture;
#if SFML_VERSION_MAJOR >= 3
	if (!texture.create(
			sf::Vector2u(static_cast<unsigned>(width), static_cast<unsigned>(height)))) {
		return false;
	}
#else
	if (!texture.create(static_cast<unsigned>(width), static_cast<unsigned>(height))) {
		return false;
	}
#endif

	texture.update(pixels);

	ImTextureID texID = convertGLTextureHandleToImTextureID(texture.getNativeHandle());
	io.Fonts->SetTexID(texID);

	return true;
}

sf::Texture &GetFontTexture() {
	assert(s_currWindowCtx);
	return s_currWindowCtx->fontTexture;
}

void SetActiveJoystickId(unsigned int joystickId) {
	assert(s_currWindowCtx);
	assert(joystickId < sf::Joystick::Count);
	s_currWindowCtx->joystickId = joystickId;
}

void SetJoystickDPadThreshold(float threshold) {
	assert(s_currWindowCtx);
	assert(threshold >= 0.f && threshold <= 100.f);
	s_currWindowCtx->dPadInfo.threshold = threshold;
}

void SetJoystickLStickThreshold(float threshold) {
	assert(s_currWindowCtx);
	assert(threshold >= 0.f && threshold <= 100.f);
	s_currWindowCtx->lStickInfo.threshold = threshold;
}

void SetJoystickRStickThreshold(float threshold) {
	assert(s_currWindowCtx);
	assert(threshold >= 0.f && threshold <= 100.f);
	s_currWindowCtx->rStickInfo.threshold = threshold;
}

void SetJoystickLTriggerThreshold(float threshold) {
	assert(s_currWindowCtx);
	assert(threshold >= -100.f && threshold <= 100.f);
	s_currWindowCtx->lTriggerInfo.threshold = threshold;
}

void SetJoystickRTriggerThreshold(float threshold) {
	assert(s_currWindowCtx);
	assert(threshold >= -100.f && threshold <= 100.f);
	s_currWindowCtx->rTriggerInfo.threshold = threshold;
}

void SetJoystickMapping(int key, unsigned int joystickButton) {
	assert(s_currWindowCtx);
	// This function now expects ImGuiKey_* values.
	// For partial backwards compatibility, also expect some ImGuiNavInput_* values.
	ImGuiKey finalKey;
	switch (key) {
		case ImGuiNavInput_Activate:
			finalKey = ImGuiKey_GamepadFaceDown;
			break;
		case ImGuiNavInput_Cancel:
			finalKey = ImGuiKey_GamepadFaceRight;
			break;
		case ImGuiNavInput_Input:
			finalKey = ImGuiKey_GamepadFaceUp;
			break;
		case ImGuiNavInput_Menu:
			finalKey = ImGuiKey_GamepadFaceLeft;
			break;
		case ImGuiNavInput_FocusPrev:
		case ImGuiNavInput_TweakSlow:
			finalKey = ImGuiKey_GamepadL1;
			break;
		case ImGuiNavInput_FocusNext:
		case ImGuiNavInput_TweakFast:
			finalKey = ImGuiKey_GamepadR1;
			break;
		default:
			assert(key >= ImGuiKey_NamedKey_BEGIN && key < ImGuiKey_NamedKey_END);
			finalKey = static_cast<ImGuiKey>(key);
	}
	assert(joystickButton < sf::Joystick::ButtonCount);
	s_currWindowCtx->joystickMapping[joystickButton] = finalKey;
}

void SetDPadXAxis(sf::Joystick::Axis dPadXAxis, bool inverted) {
	assert(s_currWindowCtx);
	s_currWindowCtx->dPadInfo.xAxis     = dPadXAxis;
	s_currWindowCtx->dPadInfo.xInverted = inverted;
}

void SetDPadYAxis(sf::Joystick::Axis dPadYAxis, bool inverted) {
	assert(s_currWindowCtx);
	s_currWindowCtx->dPadInfo.yAxis     = dPadYAxis;
	s_currWindowCtx->dPadInfo.yInverted = inverted;
}

void SetLStickXAxis(sf::Joystick::Axis lStickXAxis, bool inverted) {
	assert(s_currWindowCtx);
	s_currWindowCtx->lStickInfo.xAxis     = lStickXAxis;
	s_currWindowCtx->lStickInfo.xInverted = inverted;
}

void SetLStickYAxis(sf::Joystick::Axis lStickYAxis, bool inverted) {
	assert(s_currWindowCtx);
	s_currWindowCtx->lStickInfo.yAxis     = lStickYAxis;
	s_currWindowCtx->lStickInfo.yInverted = inverted;
}

void SetRStickXAxis(sf::Joystick::Axis rStickXAxis, bool inverted) {
	assert(s_currWindowCtx);
	s_currWindowCtx->rStickInfo.xAxis     = rStickXAxis;
	s_currWindowCtx->rStickInfo.xInverted = inverted;
}

void SetRStickYAxis(sf::Joystick::Axis rStickYAxis, bool inverted) {
	assert(s_currWindowCtx);
	s_currWindowCtx->rStickInfo.yAxis     = rStickYAxis;
	s_currWindowCtx->rStickInfo.yInverted = inverted;
}

void SetLTriggerAxis(sf::Joystick::Axis lTriggerAxis) {
	assert(s_currWindowCtx);
	s_currWindowCtx->rTriggerInfo.axis = lTriggerAxis;
}

void SetRTriggerAxis(sf::Joystick::Axis rTriggerAxis) {
	assert(s_currWindowCtx);
	s_currWindowCtx->rTriggerInfo.axis = rTriggerAxis;
}

} // end of namespace SFML

/////////////// Image Overloads for sf::Texture

void Image(const sf::Texture &texture, const sf::Color &tintColor, const sf::Color &borderColor) {
	Image(texture, static_cast<sf::Vector2f>(texture.getSize()), tintColor, borderColor);
}

void Image(const sf::Texture &texture, const sf::Vector2f &size, const sf::Color &tintColor, const sf::Color &borderColor) {
	ImTextureID textureID = convertGLTextureHandleToImTextureID(texture.getNativeHandle());

	ImGui::Image(textureID, ImVec2(size.x, size.y), ImVec2(0, 0), ImVec2(1, 1), toImColor(tintColor), toImColor(borderColor));
}

/////////////// Image Overloads for sf::RenderTexture
void Image(const sf::RenderTexture &texture, const sf::Color &tintColor, const sf::Color &borderColor) {
	Image(texture, static_cast<sf::Vector2f>(texture.getSize()), tintColor, borderColor);
}

void Image(const sf::RenderTexture &texture, const sf::Vector2f &size, const sf::Color &tintColor, const sf::Color &borderColor) {
	ImTextureID textureID =
		convertGLTextureHandleToImTextureID(texture.getTexture().getNativeHandle());

	ImGui::Image(textureID, ImVec2(size.x, size.y), ImVec2(0, 1), ImVec2(1, 0), // flipped vertically, because textures in sf::RenderTexture are
																				// stored this way
				 toImColor(tintColor), toImColor(borderColor));
}

/////////////// Image Overloads for sf::Sprite

void Image(const sf::Sprite &sprite, const sf::Color &tintColor, const sf::Color &borderColor) {
	sf::FloatRect bounds = sprite.getGlobalBounds();
	Image(sprite, sf::Vector2f(bounds.width, bounds.height), tintColor, borderColor);
}

void Image(const sf::Sprite &sprite, const sf::Vector2f &size, const sf::Color &tintColor, const sf::Color &borderColor) {
#if SFML_VERSION_MAJOR >= 3
	const sf::Texture &texture = sprite.getTexture();
#else
	const sf::Texture *texturePtr = sprite.getTexture();
	// sprite without texture cannot be drawn
	if (!texturePtr) {
		return;
	}
	const sf::Texture &texture    = *texturePtr;
#endif
	const sf::Vector2f  textureSize(texture.getSize());
	const sf::FloatRect textureRect(sprite.getTextureRect());
	ImVec2              uv0(textureRect.left / textureSize.x, textureRect.top / textureSize.y);
	ImVec2              uv1((textureRect.left + textureRect.width) / textureSize.x, (textureRect.top + textureRect.height) / textureSize.y);

	ImTextureID textureID = convertGLTextureHandleToImTextureID(texture.getNativeHandle());

	ImGui::Image(textureID, ImVec2(size.x, size.y), uv0, uv1, toImColor(tintColor), toImColor(borderColor));
}

/////////////// Image Button Overloads for sf::Texture

bool ImageButton(const sf::Texture &texture, const int framePadding, const sf::Color &bgColor, const sf::Color &tintColor) {
	return ImageButton(texture, static_cast<sf::Vector2f>(texture.getSize()), framePadding, bgColor, tintColor);
}

bool ImageButton(const sf::Texture &texture, const sf::Vector2f &size, const int framePadding, const sf::Color &bgColor, const sf::Color &tintColor) {
	ImTextureID textureID = convertGLTextureHandleToImTextureID(texture.getNativeHandle());

	return ImGui::ImageButton(textureID, ImVec2(size.x, size.y), ImVec2(0, 0), ImVec2(1, 1), framePadding, toImColor(bgColor), toImColor(tintColor));
}

/////////////// Image Button Overloads for sf::RenderTexture

bool ImageButton(const sf::RenderTexture &texture, const int framePadding, const sf::Color &bgColor, const sf::Color &tintColor) {
	return ImageButton(texture, static_cast<sf::Vector2f>(texture.getSize()), framePadding, bgColor, tintColor);
}

bool ImageButton(const sf::RenderTexture &texture, const sf::Vector2f &size, const int framePadding, const sf::Color &bgColor, const sf::Color &tintColor) {
	ImTextureID textureID =
		convertGLTextureHandleToImTextureID(texture.getTexture().getNativeHandle());

	return ImGui::ImageButton(textureID, ImVec2(size.x, size.y), ImVec2(0, 1), ImVec2(1, 0), // flipped vertically, because textures in
																							 // sf::RenderTexture are stored this way
							  framePadding, toImColor(bgColor), toImColor(tintColor));
}

/////////////// Image Button Overloads for sf::Sprite

bool ImageButton(const sf::Sprite &sprite, const int framePadding, const sf::Color &bgColor, const sf::Color &tintColor) {
	sf::FloatRect spriteSize = sprite.getGlobalBounds();
	return ImageButton(sprite, sf::Vector2f(spriteSize.width, spriteSize.height), framePadding, bgColor, tintColor);
}

bool ImageButton(const sf::Sprite &sprite, const sf::Vector2f &size, const int framePadding, const sf::Color &bgColor, const sf::Color &tintColor) {
#if SFML_VERSION_MAJOR >= 3
	const sf::Texture &texture = sprite.getTexture();
#else
	const sf::Texture *texturePtr = sprite.getTexture();
	// sprite without texture cannot be drawn
	if (!texturePtr) {
		return false;
	}
	const sf::Texture &texture = *texturePtr;
#endif
	const sf::Vector2f  textureSize(texture.getSize());
	const sf::FloatRect textureRect(sprite.getTextureRect());
	ImVec2              uv0(textureRect.left / textureSize.x, textureRect.top / textureSize.y);
	ImVec2              uv1((textureRect.left + textureRect.width) / textureSize.x, (textureRect.top + textureRect.height) / textureSize.y);

	ImTextureID textureID = convertGLTextureHandleToImTextureID(texture.getNativeHandle());
	return ImGui::ImageButton(textureID, ImVec2(size.x, size.y), uv0, uv1, framePadding, toImColor(bgColor), toImColor(tintColor));
}

/////////////// Draw_list Overloads

void DrawLine(const sf::Vector2f &a, const sf::Vector2f &b, const sf::Color &color, float thickness) {
	ImDrawList *draw_list = ImGui::GetWindowDrawList();
	ImVec2      pos       = ImGui::GetCursorScreenPos();
	draw_list->AddLine(ImVec2(a.x + pos.x, a.y + pos.y), ImVec2(b.x + pos.x, b.y + pos.y), ColorConvertFloat4ToU32(toImColor(color)), thickness);
}

void DrawRect(const sf::FloatRect &rect, const sf::Color &color, float rounding, int rounding_corners, float thickness) {
	ImDrawList *draw_list = ImGui::GetWindowDrawList();
	draw_list->AddRect(getTopLeftAbsolute(rect), getDownRightAbsolute(rect), ColorConvertFloat4ToU32(toImColor(color)), rounding, rounding_corners, thickness);
}

void DrawRectFilled(const sf::FloatRect &rect, const sf::Color &color, float rounding, int rounding_corners) {
	ImDrawList *draw_list = ImGui::GetWindowDrawList();
	draw_list->AddRectFilled(getTopLeftAbsolute(rect), getDownRightAbsolute(rect), ColorConvertFloat4ToU32(toImColor(color)), rounding, rounding_corners);
}

} // end of namespace ImGui

namespace {
ImColor toImColor(sf::Color c) {
	return ImColor(static_cast<int>(c.r), static_cast<int>(c.g), static_cast<int>(c.b), static_cast<int>(c.a));
}
ImVec2 getTopLeftAbsolute(const sf::FloatRect &rect) {
	ImVec2 pos = ImGui::GetCursorScreenPos();
	return ImVec2(rect.left + pos.x, rect.top + pos.y);
}
ImVec2 getDownRightAbsolute(const sf::FloatRect &rect) {
	ImVec2 pos = ImGui::GetCursorScreenPos();
	return ImVec2(rect.left + rect.width + pos.x, rect.top + rect.height + pos.y);
}

ImTextureID convertGLTextureHandleToImTextureID(GLuint glTextureHandle) {
	ImTextureID textureID = (ImTextureID)NULL;
	std::memcpy(&textureID, &glTextureHandle, sizeof(GLuint));
	return textureID;
}
GLuint convertImTextureIDToGLTextureHandle(ImTextureID textureID) {
	GLuint glTextureHandle;
	std::memcpy(&glTextureHandle, &textureID, sizeof(GLuint));
	return glTextureHandle;
}

// copied from imgui/backends/imgui_impl_opengl2.cpp
void SetupRenderState(ImDrawData *draw_data, int fb_width, int fb_height) {
	// Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor
	// enabled, vertex/texcoord/color pointers, polygon fill.
	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	// glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA); //
	// In order to composite our output buffer we need to preserve alpha
	glDisable(GL_CULL_FACE);
	glDisable(GL_DEPTH_TEST);
	glDisable(GL_STENCIL_TEST);
	glDisable(GL_LIGHTING);
	glDisable(GL_COLOR_MATERIAL);
	glEnable(GL_SCISSOR_TEST);
	glEnableClientState(GL_VERTEX_ARRAY);
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	glEnableClientState(GL_COLOR_ARRAY);
	glDisableClientState(GL_NORMAL_ARRAY);
	glEnable(GL_TEXTURE_2D);
	glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
	glShadeModel(GL_SMOOTH);
	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

	// Setup viewport, orthographic projection matrix
	// Our visible imgui space lies from draw_data->DisplayPos (top left) to
	// draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayPos is (0,0) for single
	// viewport apps.
	glViewport(0, 0, (GLsizei)fb_width, (GLsizei)fb_height);
	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	glLoadIdentity();
#ifdef GL_VERSION_ES_CL_1_1
	glOrthof(draw_data->DisplayPos.x, draw_data->DisplayPos.x + draw_data->DisplaySize.x, draw_data->DisplayPos.y + draw_data->DisplaySize.y, draw_data->DisplayPos.y, -1.0f, +1.0f);
#else
	glOrtho(draw_data->DisplayPos.x, draw_data->DisplayPos.x + draw_data->DisplaySize.x, draw_data->DisplayPos.y + draw_data->DisplaySize.y, draw_data->DisplayPos.y, -1.0f, +1.0f);
#endif
	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
	glLoadIdentity();
}

// Rendering callback
void RenderDrawLists(ImDrawData *draw_data) {
	ImGui::GetDrawData();
	if (draw_data->CmdListsCount == 0) {
		return;
	}

	ImGuiIO &io = ImGui::GetIO();
	assert(io.Fonts->TexID != (ImTextureID) nullptr); // You forgot to create and set font texture

	// Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates !=
	// framebuffer coordinates)
	int fb_width  = (int)(draw_data->DisplaySize.x * draw_data->FramebufferScale.x);
	int fb_height = (int)(draw_data->DisplaySize.y * draw_data->FramebufferScale.y);
	if (fb_width == 0 || fb_height == 0)
		return;
	draw_data->ScaleClipRects(io.DisplayFramebufferScale);

	// Backup GL state
	// Backup GL state
	GLint last_texture;
	glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
	GLint last_polygon_mode[2];
	glGetIntegerv(GL_POLYGON_MODE, last_polygon_mode);
	GLint last_viewport[4];
	glGetIntegerv(GL_VIEWPORT, last_viewport);
	GLint last_scissor_box[4];
	glGetIntegerv(GL_SCISSOR_BOX, last_scissor_box);
	GLint last_shade_model;
	glGetIntegerv(GL_SHADE_MODEL, &last_shade_model);
	GLint last_tex_env_mode;
	glGetTexEnviv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, &last_tex_env_mode);

#ifdef GL_VERSION_ES_CL_1_1
	GLint last_array_buffer;
	glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer);
	GLint last_element_array_buffer;
	glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_element_array_buffer);
#else
	glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT | GL_TRANSFORM_BIT);
#endif

	// Setup desired GL state
	SetupRenderState(draw_data, fb_width, fb_height);

	// Will project scissor/clipping rectangles into framebuffer space
	ImVec2 clip_off   = draw_data->DisplayPos;       // (0,0) unless using multi-viewports
	ImVec2 clip_scale = draw_data->FramebufferScale; // (1,1) unless using retina display which are
													 // often (2,2)

	// Render command lists
	for (int n = 0; n < draw_data->CmdListsCount; n++) {
		const ImDrawList *cmd_list   = draw_data->CmdLists[n];
		const ImDrawVert *vtx_buffer = cmd_list->VtxBuffer.Data;
		const ImDrawIdx  *idx_buffer = cmd_list->IdxBuffer.Data;
		glVertexPointer(2, GL_FLOAT, sizeof(ImDrawVert), (const GLvoid *)((const char *)vtx_buffer + IM_OFFSETOF(ImDrawVert, pos)));
		glTexCoordPointer(2, GL_FLOAT, sizeof(ImDrawVert), (const GLvoid *)((const char *)vtx_buffer + IM_OFFSETOF(ImDrawVert, uv)));
		glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(ImDrawVert), (const GLvoid *)((const char *)vtx_buffer + IM_OFFSETOF(ImDrawVert, col)));

		for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++) {
			const ImDrawCmd *pcmd = &cmd_list->CmdBuffer[cmd_i];
			if (pcmd->UserCallback) {
				// User callback, registered via ImDrawList::AddCallback()
				// (ImDrawCallback_ResetRenderState is a special callback value used by the user to
				// request the renderer to reset render state.)
				if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
					SetupRenderState(draw_data, fb_width, fb_height);
				else
					pcmd->UserCallback(cmd_list, pcmd);
			} else {
				// Project scissor/clipping rectangles into framebuffer space
				ImVec4 clip_rect;
				clip_rect.x = (pcmd->ClipRect.x - clip_off.x) * clip_scale.x;
				clip_rect.y = (pcmd->ClipRect.y - clip_off.y) * clip_scale.y;
				clip_rect.z = (pcmd->ClipRect.z - clip_off.x) * clip_scale.x;
				clip_rect.w = (pcmd->ClipRect.w - clip_off.y) * clip_scale.y;

				if (clip_rect.x < static_cast<float>(fb_width) &&
					clip_rect.y < static_cast<float>(fb_height) && clip_rect.z >= 0.0f &&
					clip_rect.w >= 0.0f) {
					// Apply scissor/clipping rectangle
					glScissor((int)clip_rect.x, (int)(static_cast<float>(fb_height) - clip_rect.w), (int)(clip_rect.z - clip_rect.x), (int)(clip_rect.w - clip_rect.y));

					// Bind texture, Draw
					GLuint textureHandle = convertImTextureIDToGLTextureHandle(pcmd->TextureId);
					glBindTexture(GL_TEXTURE_2D, textureHandle);
					glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, idx_buffer + pcmd->IdxOffset);
				}
			}
		}
	}

	// Restore modified GL state
	glDisableClientState(GL_COLOR_ARRAY);
	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
	glDisableClientState(GL_VERTEX_ARRAY);
	glBindTexture(GL_TEXTURE_2D, (GLuint)last_texture);
	glMatrixMode(GL_MODELVIEW);
	glPopMatrix();
	glMatrixMode(GL_PROJECTION);
	glPopMatrix();
	glPopAttrib();
	glPolygonMode(GL_FRONT, (GLenum)last_polygon_mode[0]);
	glPolygonMode(GL_BACK, (GLenum)last_polygon_mode[1]);
	glViewport(last_viewport[0], last_viewport[1], (GLsizei)last_viewport[2], (GLsizei)last_viewport[3]);
	glScissor(last_scissor_box[0], last_scissor_box[1], (GLsizei)last_scissor_box[2], (GLsizei)last_scissor_box[3]);
	glShadeModel((GLenum)last_shade_model);
	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, last_tex_env_mode);

#ifdef GL_VERSION_ES_CL_1_1
	glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, last_element_array_buffer);
	glDisable(GL_SCISSOR_TEST);
#endif
}

unsigned int getConnectedJoystickId() {
	for (unsigned int i = 0; i < (unsigned int)sf::Joystick::Count; ++i) {
		if (sf::Joystick::isConnected(i))
			return i;
	}

	return NULL_JOYSTICK_ID;
}

void initDefaultJoystickMapping() {
	ImGui::SFML::SetJoystickMapping(ImGuiKey_GamepadFaceDown, 0);
	ImGui::SFML::SetJoystickMapping(ImGuiKey_GamepadFaceRight, 1);
	ImGui::SFML::SetJoystickMapping(ImGuiKey_GamepadFaceLeft, 2);
	ImGui::SFML::SetJoystickMapping(ImGuiKey_GamepadFaceUp, 3);
	ImGui::SFML::SetJoystickMapping(ImGuiKey_GamepadL1, 4);
	ImGui::SFML::SetJoystickMapping(ImGuiKey_GamepadR1, 5);
	ImGui::SFML::SetJoystickMapping(ImGuiKey_GamepadBack, 6);
	ImGui::SFML::SetJoystickMapping(ImGuiKey_GamepadStart, 7);
	ImGui::SFML::SetJoystickMapping(ImGuiKey_GamepadL3, 9);
	ImGui::SFML::SetJoystickMapping(ImGuiKey_GamepadR3, 10);

	ImGui::SFML::SetDPadXAxis(sf::Joystick::PovX);
	// D-pad Y axis is inverted on Windows
#ifdef _WIN32
	ImGui::SFML::SetDPadYAxis(sf::Joystick::PovY, true);
#else
	ImGui::SFML::SetDPadYAxis(sf::Joystick::PovY);
#endif

	ImGui::SFML::SetLStickXAxis(sf::Joystick::X);
	ImGui::SFML::SetLStickYAxis(sf::Joystick::Y);
	ImGui::SFML::SetRStickXAxis(sf::Joystick::U);
	ImGui::SFML::SetRStickYAxis(sf::Joystick::V);
	ImGui::SFML::SetLTriggerAxis(sf::Joystick::Z);
	ImGui::SFML::SetRTriggerAxis(sf::Joystick::R);

	ImGui::SFML::SetJoystickDPadThreshold(5.f);
	ImGui::SFML::SetJoystickLStickThreshold(5.f);
	ImGui::SFML::SetJoystickRStickThreshold(15.f);
	ImGui::SFML::SetJoystickLTriggerThreshold(0.f);
	ImGui::SFML::SetJoystickRTriggerThreshold(0.f);
}

void updateJoystickButtonState(ImGuiIO &io) {
	for (int i = 0; i < static_cast<int>(sf::Joystick::ButtonCount); ++i) {
		ImGuiKey key = s_currWindowCtx->joystickMapping[i];
		if (key != ImGuiKey_None) {
			bool isPressed = sf::Joystick::isButtonPressed(s_currWindowCtx->joystickId, static_cast<unsigned>(i));
			if (s_currWindowCtx->windowHasFocus || !isPressed) {
				io.AddKeyEvent(key, isPressed);
			}
		}
	}
}

void updateJoystickAxis(ImGuiIO &io, ImGuiKey key, sf::Joystick::Axis axis, float threshold, float maxThreshold, bool inverted) {
	float pos = sf::Joystick::getAxisPosition(s_currWindowCtx->joystickId, axis);
	if (inverted) {
		pos = -pos;
	}
	bool passedThreshold = (pos > threshold) == (maxThreshold > threshold);
	if (passedThreshold && s_currWindowCtx->windowHasFocus) {
		io.AddKeyAnalogEvent(key, true, std::abs(pos / 100.f));
	} else {
		io.AddKeyAnalogEvent(key, false, 0);
	}
}

void updateJoystickAxisPair(ImGuiIO &io, ImGuiKey key1, ImGuiKey key2, sf::Joystick::Axis axis, float threshold, bool inverted) {
	updateJoystickAxis(io, key1, axis, -threshold, -100, inverted);
	updateJoystickAxis(io, key2, axis, threshold, 100, inverted);
}

void updateJoystickDPadState(ImGuiIO &io) {
	updateJoystickAxisPair(io, ImGuiKey_GamepadDpadLeft, ImGuiKey_GamepadDpadRight, s_currWindowCtx->dPadInfo.xAxis, s_currWindowCtx->dPadInfo.threshold, s_currWindowCtx->dPadInfo.xInverted);
	updateJoystickAxisPair(io, ImGuiKey_GamepadDpadUp, ImGuiKey_GamepadDpadDown, s_currWindowCtx->dPadInfo.yAxis, s_currWindowCtx->dPadInfo.threshold, s_currWindowCtx->dPadInfo.yInverted);
}

void updateJoystickAxisState(ImGuiIO &io) {
	updateJoystickAxisPair(io, ImGuiKey_GamepadLStickLeft, ImGuiKey_GamepadLStickRight, s_currWindowCtx->lStickInfo.xAxis, s_currWindowCtx->lStickInfo.threshold, s_currWindowCtx->lStickInfo.xInverted);
	updateJoystickAxisPair(io, ImGuiKey_GamepadLStickUp, ImGuiKey_GamepadLStickDown, s_currWindowCtx->lStickInfo.yAxis, s_currWindowCtx->lStickInfo.threshold, s_currWindowCtx->lStickInfo.yInverted);

	updateJoystickAxisPair(io, ImGuiKey_GamepadRStickLeft, ImGuiKey_GamepadRStickRight, s_currWindowCtx->rStickInfo.xAxis, s_currWindowCtx->rStickInfo.threshold, s_currWindowCtx->rStickInfo.xInverted);
	updateJoystickAxisPair(io, ImGuiKey_GamepadRStickUp, ImGuiKey_GamepadRStickDown, s_currWindowCtx->rStickInfo.yAxis, s_currWindowCtx->rStickInfo.threshold, s_currWindowCtx->rStickInfo.yInverted);

	updateJoystickAxis(io, ImGuiKey_GamepadL2, s_currWindowCtx->lTriggerInfo.axis, s_currWindowCtx->lTriggerInfo.threshold, 100, false);
	updateJoystickAxis(io, ImGuiKey_GamepadR2, s_currWindowCtx->rTriggerInfo.axis, s_currWindowCtx->rTriggerInfo.threshold, 100, false);
}

void setClipboardText(void * /*userData*/, const char *text) {
	sf::Clipboard::setString(sf::String::fromUtf8(text, text + std::strlen(text)));
}

const char *getClipboardText(void * /*userData*/) {
	std::basic_string<std::uint8_t> tmp = sf::Clipboard::getString().toUtf8();
	s_clipboardText.assign(tmp.begin(), tmp.end());
	return s_clipboardText.c_str();
}

void loadMouseCursor(ImGuiMouseCursor imguiCursorType, sf::Cursor::Type sfmlCursorType) {
	s_currWindowCtx->mouseCursorLoaded[imguiCursorType] =
		s_currWindowCtx->mouseCursors[imguiCursorType].loadFromSystem(sfmlCursorType);
}

void updateMouseCursor(sf::Window &window) {
	ImGuiIO &io = ImGui::GetIO();
	if ((io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange) == 0) {
		ImGuiMouseCursor cursor = ImGui::GetMouseCursor();
		if (io.MouseDrawCursor || cursor == ImGuiMouseCursor_None) {
			window.setMouseCursorVisible(false);
		} else {
			window.setMouseCursorVisible(true);

			sf::Cursor &c = s_currWindowCtx->mouseCursorLoaded[cursor] ?
								s_currWindowCtx->mouseCursors[cursor] :
								s_currWindowCtx->mouseCursors[ImGuiMouseCursor_Arrow];
			window.setMouseCursor(c);
		}
	}
}

} // end of anonymous namespace