#include "player-input.hpp"

#include "pk.h"
#include "window.hpp"

#include <GLFW/glfw3.h>

struct CursorEnterEvent {
	bool entered;
};
struct CursorPosEvent {
	double x;
	double y;
};
struct KeyEvent {
	int32_t button;
	int32_t mods;
	int8_t action;
};
struct MouseButtonEvent {
	int32_t button;
	int32_t mods;
	int8_t action;
};
struct ScrollEvent {
	double x;
	double y;
};
struct WindowFocusEvent {
	bool focused;
};

GLFWcursorenterfun prevCursorEnterCallback;
GLFWcursorposfun prevCursorPosCallback;
GLFWkeyfun prevKeyCallback;
GLFWmousebuttonfun prevMouseButtonCallback;
GLFWscrollfun prevScrollCallback;
GLFWwindowfocusfun prevWindowFocusCallback;

TypeSafeInt_B(InputActionSetHandle);

pk_arr_t<CursorPosEvent> unhandledCursorPosEvents{};
pk_arr_t<CursorEnterEvent> unhandledCursorEnterEvents{};
pk_arr_t<KeyEvent> unhandledKeyEvents{};
pk_arr_t<MouseButtonEvent> unhandledMouseButtonEvents{};
pk_arr_t<ScrollEvent> unhandledScrollEvents{};
pk_arr_t<WindowFocusEvent> unhandledWindowFocusEvents{};

pk_arr_t<PkeCursorEnterEvent> registeredCursorEnterEvents{};
bool lastCursorEntered = false;
pk_arr_t<PkeCursorPosEvent> registeredCursorPosEvents{};
struct {
	double x = 0;
	double y = 0;
} lastMousePos;
pk_arr_t<PkeKeyEvent> registeredKeyEvents{};
pk_arr_t<PkeMouseButtonEvent> registeredMouseButtonEvents{};
pk_arr_t<PkeScrollEvent> registeredScrollEvents{};
pk_arr_t<PkeWindowFocusEvent> registeredWindowFocusEvents{};
bool lastWindowFocus = false;

pk_arr_t<PkeInputSet> registeredInputSets{};
pk_arr_t<InputActionSetHandle> activeInputSetStack{};

PkeInputAction *FindActionByName(const char *actionName) {
	uint32_t count = activeInputSetStack.next;
	for (uint32_t i = count; i > 0; --i) {
		InputActionSetHandle handle = activeInputSetStack[i-1];
		InputActionSetHandle_T index = static_cast<InputActionSetHandle_T>(handle);
		PkeInputSet &set = registeredInputSets[index];
		for (int64_t k = 0; k < set.actionCount; ++k) {
			PkeInputAction &inputAction = set.actions[k];
			if (strcmp(actionName, inputAction.name) != 0) {
				continue;
			};
			return &inputAction;
		}
	}
	return nullptr;
}
template<InputEventHash T, typename S> InputEventHash FindActivePkeInputAction_ByAction(const PkeInputAction *inputAction, S *&activeEvent, int32_t index) {
	activeEvent = nullptr;
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_ENTER) != InputEventHash{0}) {
		activeEvent = &registeredCursorEnterEvents[inputAction->event_indices[index]];
		return PKE_INPUT_HASH_EVENT_TYPE_CURSOR_ENTER;
	}
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_POS) != InputEventHash{0}) {
		activeEvent = &registeredCursorPosEvents[inputAction->event_indices[index]];
		return PKE_INPUT_HASH_EVENT_TYPE_CURSOR_POS;
	}
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_KEY) != InputEventHash{0}) {
		activeEvent = &registeredKeyEvents[inputAction->event_indices[index]];
		return PKE_INPUT_HASH_EVENT_TYPE_KEY;
	}
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_MOUSE_BUTTON) != InputEventHash{0}) {
		activeEvent = &registeredMouseButtonEvents[inputAction->event_indices[index]];
		return PKE_INPUT_HASH_EVENT_TYPE_MOUSE_BUTTON;
	}
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_SCROLL) != InputEventHash{0}) {
		activeEvent = &registeredScrollEvents[inputAction->event_indices[index]];
		return PKE_INPUT_HASH_EVENT_TYPE_SCROLL;
	}
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_WINDOW_FOCUS) != InputEventHash{0}) {
		activeEvent = &registeredWindowFocusEvents[inputAction->event_indices[index]];
		return PKE_INPUT_HASH_EVENT_TYPE_WINDOW_FOCUS;
	}
	return InputEventHash{0};
}
/*
template<InputEventHash T, typename S> InputEventHash FindActivePkeInputAction_ByName(const char *actionName, S *&activeEvent) {
	activeEvent = nullptr;
	bool any = false;
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_ENTER) != InputEventHash{0}) {
		any = any || bool(registeredCursorEnterEvents.next);
	}
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_POS) != InputEventHash{0}) {
		any = any || bool(registeredCursorPosEvents.next);
	}
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_KEY) != InputEventHash{0}) {
		any = any || bool(registeredKeyEvents.next);
	}
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_MOUSE_BUTTON) != InputEventHash{0}) {
		any = any || bool(registeredMouseButtonEvents.next);
	}
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_SCROLL) != InputEventHash{0}) {
		any = any || bool(registeredScrollEvents.next);
	}
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_WINDOW_FOCUS) != InputEventHash{0}) {
		any = any || bool(registeredWindowFocusEvents.next);
	}
	if (any == false) return InputEventHash{0};
	uint32_t count = activeInputSetStack.next;
	for (uint32_t i = count; i > 0; --i) {
		InputActionSetHandle handle = activeInputSetStack[i-1];
		InputActionSetHandle_T index = static_cast<InputActionSetHandle_T>(handle);
		PkeInputSet &set = registeredInputSets[index];
		for (int64_t k = 0; k < set.actionCount; ++k) {
			PkeInputAction &inputAction = set.actions[k];
			if (strcmp(actionName, inputAction.name) != 0) {
				continue;
			};
			if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_ENTER) != InputEventHash{0}) {
				activeEvent = &registeredCursorEnterEvents[inputAction.eventIndex];
				return PKE_INPUT_HASH_EVENT_TYPE_CURSOR_ENTER;
			}
			if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_POS) != InputEventHash{0}) {
				activeEvent = &registeredCursorPosEvents[inputAction.eventIndex];
				return PKE_INPUT_HASH_EVENT_TYPE_CURSOR_POS;
			}
			if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_KEY) != InputEventHash{0}) {
				activeEvent = &registeredKeyEvents[inputAction.eventIndex];
				return PKE_INPUT_HASH_EVENT_TYPE_KEY;
			}
			if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_MOUSE_BUTTON) != InputEventHash{0}) {
				activeEvent = &registeredMouseButtonEvents[inputAction.eventIndex];
				return PKE_INPUT_HASH_EVENT_TYPE_MOUSE_BUTTON;
			}
			if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_SCROLL) != InputEventHash{0}) {
				activeEvent = &registeredScrollEvents[inputAction.eventIndex];
				return PKE_INPUT_HASH_EVENT_TYPE_SCROLL;
			}
			if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_WINDOW_FOCUS) != InputEventHash{0}) {
				activeEvent = &registeredWindowFocusEvents[inputAction.eventIndex];
				return PKE_INPUT_HASH_EVENT_TYPE_WINDOW_FOCUS;
			}
		}
	}
	return InputEventHash{0};
}
*/
template<InputEventHash T, typename S> InputEventHash FindActivePkeInputAction_ByType(const PkeInputEventMask &mask, S *&activeEvent) {
	uint32_t count, i;
	activeEvent = nullptr;
	bool any = false;
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_ENTER) != InputEventHash{0}) {
		any = any || bool(registeredCursorEnterEvents.next);
	}
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_POS) != InputEventHash{0}) {
		any = any || bool(registeredCursorPosEvents.next);
	}
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_KEY) != InputEventHash{0}) {
		any = any || bool(registeredKeyEvents.next);
	}
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_MOUSE_BUTTON) != InputEventHash{0}) {
		any = any || bool(registeredMouseButtonEvents.next);
	}
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_SCROLL) != InputEventHash{0}) {
		any = any || bool(registeredScrollEvents.next);
	}
	if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_WINDOW_FOCUS) != InputEventHash{0}) {
		any = any || bool(registeredWindowFocusEvents.next);
	}
	if (any == false) return InputEventHash{0};
	count = activeInputSetStack.next;
	for (i = count; i > 0; --i) {
		InputActionSetHandle handle = activeInputSetStack[i-1];
		InputActionSetHandle_T index = static_cast<InputActionSetHandle_T>(handle);
		PkeInputSet &set = registeredInputSets[index];
		for (int64_t k = 0; k < set.actionCount; ++k) {
			PkeInputAction &inputAction = set.actions[k];
			for (int64_t l = 0; l < PKE_INPUT_ACTION_MASK_INDEX_COUNT; ++l) {
				PkeInputEventMask &evMask = inputAction.masks[l];
				if ((evMask.computedHash & mask.computedHash) == InputEventHash{0}) {
					continue;
				}
				if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_KEY) != InputEventHash{0}) {
					if (evMask.button != mask.button) {
						continue;
					}
					if (evMask.mods != mask.mods) {
						continue;
					}
				}
				if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_MOUSE_BUTTON) != InputEventHash{0}) {
					if (evMask.button != mask.button) {
						continue;
					}
					if (evMask.mods != mask.mods) {
						continue;
					}
				}
				if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_ENTER) != InputEventHash{0}) {
					activeEvent = &registeredCursorEnterEvents[inputAction.event_indices[l]];
					return PKE_INPUT_HASH_EVENT_TYPE_CURSOR_ENTER;
				}
				if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_POS) != InputEventHash{0}) {
					activeEvent = &registeredCursorPosEvents[inputAction.event_indices[l]];
					return PKE_INPUT_HASH_EVENT_TYPE_CURSOR_POS;
				}
				if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_KEY) != InputEventHash{0}) {
					activeEvent = &registeredKeyEvents[inputAction.event_indices[l]];
					return PKE_INPUT_HASH_EVENT_TYPE_KEY;
				}
				if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_MOUSE_BUTTON) != InputEventHash{0}) {
					activeEvent = &registeredMouseButtonEvents[inputAction.event_indices[l]];
					return PKE_INPUT_HASH_EVENT_TYPE_MOUSE_BUTTON;
				}
				if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_SCROLL) != InputEventHash{0}) {
					activeEvent = &registeredScrollEvents[inputAction.event_indices[l]];
					return PKE_INPUT_HASH_EVENT_TYPE_SCROLL;
				}
				if constexpr((T & PKE_INPUT_HASH_EVENT_TYPE_WINDOW_FOCUS) != InputEventHash{0}) {
					activeEvent = &registeredWindowFocusEvents[inputAction.event_indices[l]];
					return PKE_INPUT_HASH_EVENT_TYPE_WINDOW_FOCUS;
				}
			}
		}
	}
	return InputEventHash{0};
}
constexpr auto FindActivePkeInputAction_CursorEnter_ByType = FindActivePkeInputAction_ByType<PKE_INPUT_HASH_EVENT_TYPE_CURSOR_ENTER, PkeCursorEnterEvent>;
constexpr auto FindActivePkeInputAction_CursorPos_ByType = FindActivePkeInputAction_ByType<PKE_INPUT_HASH_EVENT_TYPE_CURSOR_POS, PkeCursorPosEvent>;
constexpr auto FindActivePkeInputAction_Key_ByType = FindActivePkeInputAction_ByType<PKE_INPUT_HASH_EVENT_TYPE_KEY, PkeKeyEvent>;
constexpr auto FindActivePkeInputAction_MouseButton_ByType = FindActivePkeInputAction_ByType<PKE_INPUT_HASH_EVENT_TYPE_MOUSE_BUTTON, PkeMouseButtonEvent>;
constexpr auto FindActivePkeInputAction_Scroll_ByType = FindActivePkeInputAction_ByType<PKE_INPUT_HASH_EVENT_TYPE_SCROLL, PkeScrollEvent>;
constexpr auto FindActivePkeInputAction_WindowFocus_ByType = FindActivePkeInputAction_ByType<PKE_INPUT_HASH_EVENT_TYPE_WINDOW_FOCUS, PkeWindowFocusEvent>;

// constexpr auto FindActivePkeInputAction_CursorEnter_ByName = FindActivePkeInputAction_ByName<PKE_INPUT_HASH_EVENT_TYPE_CURSOR_ENTER, PkeCursorEnterEvent>;
// constexpr auto FindActivePkeInputAction_CursorPos_ByName = FindActivePkeInputAction_ByName<PKE_INPUT_HASH_EVENT_TYPE_CURSOR_POS, PkeCursorPosEvent>;
// constexpr auto FindActivePkeInputAction_Key_ByName = FindActivePkeInputAction_ByName<PKE_INPUT_HASH_EVENT_TYPE_KEY, PkeKeyEvent>;
// constexpr auto FindActivePkeInputAction_MouseButton_ByName = FindActivePkeInputAction_ByName<PKE_INPUT_HASH_EVENT_TYPE_MOUSE_BUTTON, PkeMouseButtonEvent>;
// constexpr auto FindActivePkeInputAction_Scroll_ByName = FindActivePkeInputAction_ByName<PKE_INPUT_HASH_EVENT_TYPE_SCROLL, PkeScrollEvent>;
// constexpr auto FindActivePkeInputAction_WindowFocus_ByName = FindActivePkeInputAction_ByName<PKE_INPUT_HASH_EVENT_TYPE_WINDOW_FOCUS, PkeWindowFocusEvent>;


void PkeInput_Tick(double delta) {
	(void)delta;
	uint32_t count, i;
	// reset everything
	// @performance could happen concurrently
	{
		count = registeredCursorPosEvents.next;
		for (i = 0; i < count; ++i) {
			auto &ev = registeredCursorPosEvents[i];
			ev.xMotion = 0;
			ev.yMotion = 0;
		}
		count = registeredKeyEvents.next;
		for (i = 0; i < count; ++i) {
			auto &ev = registeredKeyEvents[i];
			// TODO the idea here was right, but wrong place and too wide a swath
			// if (i < count - 1) ev.isPressed = false;
			ev.thisTick = false;
		}
		count = registeredMouseButtonEvents.next;
		for (i = 0; i < count; ++i) {
			auto &ev = registeredMouseButtonEvents[i];
			// TODO the idea here was right, but wrong place and too wide a swath
			// if (i < count - 1) ev.isPressed = false;
			ev.thisTick = false;
		}
		count = registeredScrollEvents.next;
		for (i = 0; i < count; ++i) {
			auto &ev = registeredScrollEvents[i];
			ev.xMotion = 0;
			ev.yMotion = 0;
		}
	}

	// handle unhandled events
	// @performance cache action->event results
	{
		do { // while (0)
			PkeCursorEnterEvent *primaryEvent = nullptr;
			FindActivePkeInputAction_CursorEnter_ByType(PkeInputEventMask {
					.computedHash = PKE_INPUT_HASH_ALL_CURSOR_ENTER_EVENTS
				}, primaryEvent);
			if (primaryEvent == nullptr) {
				break;
			}
			const auto &ev = unhandledCursorEnterEvents[unhandledCursorEnterEvents.next-1];
			primaryEvent->isEntered = ev.entered;
			lastCursorEntered = ev.entered;
		} while (0);
		do { // while (0)
			PkeCursorPosEvent *primaryEvent = nullptr;
			FindActivePkeInputAction_CursorPos_ByType(PkeInputEventMask {
					.computedHash = PKE_INPUT_HASH_ALL_CURSOR_POS_EVENTS
				}, primaryEvent);
			if (primaryEvent == nullptr) {
				break;
			}
			count = unhandledCursorPosEvents.next;
			for (i = 0; i < count; ++i) {
				const auto &ev = unhandledCursorPosEvents[i];
				primaryEvent->xMotion += ev.x - lastMousePos.x;
				primaryEvent->yMotion += ev.y - lastMousePos.y;
				lastMousePos.x = ev.x;
				lastMousePos.y = ev.y;
			}
		} while (0);
		do { // while (0)
			count = unhandledKeyEvents.next;
			for (i = 0; i < count; ++i) {
				const auto &ev = unhandledKeyEvents[i];
				PkeKeyEvent *primaryEvent = nullptr;
				FindActivePkeInputAction_Key_ByType(PkeInputEventMask {
						.computedHash = PKE_INPUT_HASH_ALL_KEY_EVENTS,
						.button = ev.button,
						.mods = ev.mods,
					}, primaryEvent);
				if (primaryEvent == nullptr) {
					continue;
				}
				if (ev.action == GLFW_PRESS) {
					primaryEvent->isPressed = true;
					primaryEvent->thisTick = true;
				} else if (ev.action == GLFW_RELEASE) {
					primaryEvent->isPressed = false;
					primaryEvent->thisTick = true;
				} else {
					// repeat
					primaryEvent->isPressed = true;
				}
			}
		} while (0);
		do { // while (0)
			count = unhandledMouseButtonEvents.next;
			for (i = 0; i < count; ++i) {
				const auto &ev = unhandledMouseButtonEvents[i];
				PkeMouseButtonEvent *primaryEvent = nullptr;
				FindActivePkeInputAction_MouseButton_ByType(PkeInputEventMask {
						.computedHash = PKE_INPUT_HASH_ALL_MOUSE_BUTTON_EVENTS,
						.button = ev.button,
						.mods = ev.mods,
					}, primaryEvent);
				if (primaryEvent == nullptr) {
					continue;
				}
				if (ev.action == GLFW_PRESS) {
					primaryEvent->isPressed = true;
					primaryEvent->thisTick = true;
				} else if (ev.action == GLFW_RELEASE) {
					primaryEvent->isPressed = false;
					primaryEvent->thisTick = true;
				}
			}
		} while (0);
		do { // while (0)
			PkeScrollEvent *primaryEvent = nullptr;
			FindActivePkeInputAction_Scroll_ByType(PkeInputEventMask {
					.computedHash = PKE_INPUT_HASH_ALL_SCROLL_EVENTS
				}, primaryEvent);
			if (primaryEvent == nullptr) {
				break;
			}
			count = unhandledScrollEvents.next;
			for (i = 0; i < count; ++i) {
				const auto &ev = unhandledScrollEvents[i];
				primaryEvent->xMotion += ev.x;
				primaryEvent->yMotion += ev.y;
			}
		} while (0);
		do { // while (0)
			PkeWindowFocusEvent *primaryEvent = nullptr;
			FindActivePkeInputAction_WindowFocus_ByType(PkeInputEventMask {
					.computedHash = PKE_INPUT_HASH_ALL_WINDOW_FOCUS_EVENTS
				}, primaryEvent);
			if (primaryEvent == nullptr) {
				break;
			}
			const auto &ev = unhandledWindowFocusEvents[unhandledWindowFocusEvents.next-1];
			primaryEvent->isFocused = ev.focused;
			lastWindowFocus = ev.focused;
		} while (0);
	}
	pk_arr_reset(&unhandledCursorEnterEvents);
	pk_arr_reset(&unhandledCursorPosEvents);
	pk_arr_reset(&unhandledKeyEvents);
	pk_arr_reset(&unhandledMouseButtonEvents);
	pk_arr_reset(&unhandledScrollEvents);
	pk_arr_reset(&unhandledWindowFocusEvents);

	// set boolean events with latest data
	//  - we do this after processing events to make sure that if a set is
	//    unregistered, the appropriate values are propagated
	//  - theoretically this scenario could be handled on unregister,
	//    but I'm not sure which would be more performant
	// JCB 2025-05-21
	//  I'm refactoring this and it seems to skip the last element.
	//  At a glance, I'm not sure if this is intentional or a bug.
	//  I'm going to preserve this logic in my refactor.
	//  Update this comment as needed and make sure to document the purpose.
	{
		count = registeredCursorEnterEvents.next;
		for (i = 0; i < count; ++i) {
			registeredCursorEnterEvents[i].isEntered = lastCursorEntered;
			if (i == count-2) break;
		}
		count = registeredWindowFocusEvents.next;
		for (i = 0; i < count; ++i) {
			registeredWindowFocusEvents[i].isFocused = lastWindowFocus;
			if (i == count-2) break;
		}
	}
}

PkeInputEventHolder PkeInput_Query(const char *actionName) {
	PkeInputEventBase *ev = nullptr;
	auto *action = FindActionByName(actionName);
	InputEventHash type = InputEventHash{0};
	for (int32_t i = 0; i < PKE_INPUT_ACTION_MASK_INDEX_COUNT; ++i) {
		PkeInputEventMask event_mask = action->masks[i];
		if (bool(event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_ENTER)) {
			PkeCursorEnterEvent *event;
			type = FindActivePkeInputAction_ByAction<PKE_INPUT_HASH_EVENT_TYPE_CURSOR_ENTER, PkeCursorEnterEvent>(action, event, i);
			ev = event;
			break;
		} else if (bool(event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_POS)) {
			PkeCursorPosEvent *event;
			type = FindActivePkeInputAction_ByAction<PKE_INPUT_HASH_EVENT_TYPE_CURSOR_POS, PkeCursorPosEvent>(action, event, i);
			ev = event;
			break;
		} else if (bool(event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_KEY)) {
			PkeKeyEvent *event;
			type = FindActivePkeInputAction_ByAction<PKE_INPUT_HASH_EVENT_TYPE_KEY, PkeKeyEvent>(action, event, i);
			ev = event;
			break;
		} else if (bool(event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_MOUSE_BUTTON)) {
			PkeMouseButtonEvent *event;
			type = FindActivePkeInputAction_ByAction<PKE_INPUT_HASH_EVENT_TYPE_MOUSE_BUTTON, PkeMouseButtonEvent>(action, event, i);
			ev = event;
			break;
		} else if (bool(event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_SCROLL)) {
			PkeScrollEvent *event;
			type = FindActivePkeInputAction_ByAction<PKE_INPUT_HASH_EVENT_TYPE_SCROLL, PkeScrollEvent>(action, event, i);
			ev = event;
			break;
		} else if (bool(event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_WINDOW_FOCUS)) {
			PkeWindowFocusEvent *event;
			type = FindActivePkeInputAction_ByAction<PKE_INPUT_HASH_EVENT_TYPE_WINDOW_FOCUS, PkeWindowFocusEvent>(action, event, i);
			ev = event;
			break;
		}
	}
	return PkeInputEventHolder {
		.type = type,
		.ptr = ev,
	};
}

void CursorEnterCallback(GLFWwindow *window, int entered) {
	if (registeredCursorEnterEvents.next) {
		pk_arr_append_t(&unhandledCursorEnterEvents, { .entered = bool(entered) });
	}
	if (prevCursorEnterCallback) {
		prevCursorEnterCallback(window, entered);
	}
}

void CursorPosCallback(GLFWwindow *window, double xPos, double yPos) {
	if (registeredCursorPosEvents.next) {
		pk_arr_append_t(&unhandledCursorPosEvents, {
			.x = xPos,
			.y = yPos,
		});
	}
	if (prevCursorPosCallback) {
		prevCursorPosCallback(window, xPos, yPos);
	}
}

void KeyCallback(GLFWwindow *window, int key, int scancode, int action, int mods) {
	if (registeredKeyEvents.next) {
		pk_arr_append_t(&unhandledKeyEvents, {
			.button = key,
			.mods = mods & 0x0F,
			.action = int8_t(action),
		});
	}
	if (prevKeyCallback) {
		prevKeyCallback(window, key, scancode, action, mods);
	}
}

void MouseButtonCallback(GLFWwindow *window, int button, int action, int mods) {
	if (registeredMouseButtonEvents.next) {
		pk_arr_append_t(&unhandledMouseButtonEvents, {
			.button = button,
			.mods = mods,
			.action = int8_t(action),
		});
	}
	if (prevMouseButtonCallback) {
		prevMouseButtonCallback(window, button, action, mods);
	}
}

void ScrollCallback(GLFWwindow *window, double xOffset, double yOffset) {
	if (registeredScrollEvents.next) {
		pk_arr_append_t(&unhandledScrollEvents, {
			.x = xOffset,
			.y = yOffset,
		});
	}
	if (prevScrollCallback) {
		prevScrollCallback(window, xOffset, yOffset);
	}
}

void WindowFocusCallback(GLFWwindow *window, int focused) {
	if (registeredWindowFocusEvents.next) {
		pk_arr_append_t(&unhandledWindowFocusEvents, {
			.focused = bool(focused),
		});
	}
	if (prevWindowFocusCallback) {
		prevWindowFocusCallback(window, focused);
	}
}

void PkeInput_Init() {
	prevCursorEnterCallback = glfwSetCursorEnterCallback(window, CursorEnterCallback);
	prevCursorPosCallback = glfwSetCursorPosCallback(window, CursorPosCallback);
	prevKeyCallback = glfwSetKeyCallback(window, KeyCallback);
	prevMouseButtonCallback = glfwSetMouseButtonCallback(window, MouseButtonCallback);
	prevScrollCallback = glfwSetScrollCallback(window, ScrollCallback);
	prevWindowFocusCallback = glfwSetWindowFocusCallback(window, WindowFocusCallback);
}

InputActionSetHandle PkeInput_RegisterSet(const PkeInputSet &set) {
	InputActionSetHandle returnValue{static_cast<InputActionSetHandle_T>(registeredInputSets.next)};
	pk_arr_append_t(&registeredInputSets, set);
	return returnValue;
}

void PkeInput_ActivateSet(InputActionSetHandle handle) {
	InputActionSetHandle_T index{static_cast<InputActionSetHandle_T>(handle)};
	pk_arr_append_t(&activeInputSetStack, handle);
	auto &set = registeredInputSets[index];
	for (int64_t i = 0; i < set.actionCount; ++i) {
		PkeInputAction &action = set.actions[i];
		for (int k = 0; k < PKE_INPUT_ACTION_MASK_INDEX_COUNT; ++k) {
			PkeInputEventMask event_mask = action.masks[k];
			if ((event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_ENTER) != InputEventHash{0}) {
				action.event_indices[k] = registeredCursorEnterEvents.next;
				PkeCursorEnterEvent ev{};
				ev.sourceSet = handle;
				ev.isEntered = lastCursorEntered;
				pk_arr_append_t(&registeredCursorEnterEvents, ev);
			}
			if ((event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_POS) != InputEventHash{0}) {
				action.event_indices[k] = registeredCursorPosEvents.next;
				PkeCursorPosEvent ev {};
				ev.sourceSet = handle;
				ev.xMotion = 0;
				ev.yMotion = 0;
				pk_arr_append_t(&registeredCursorPosEvents, ev);
				glfwGetCursorPos(window, &lastMousePos.x, &lastMousePos.y);
			}
			if ((event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_KEY) != InputEventHash{0}) {
				action.event_indices[k] = registeredKeyEvents.next;
				PkeKeyEvent ev{};
				ev.sourceSet = handle;
				ev.button = event_mask.button;
				ev.mods = event_mask.mods;
				pk_arr_append_t(&registeredKeyEvents, ev);
			}
			if ((event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_MOUSE_BUTTON) != InputEventHash{0}) {
				action.event_indices[k] = registeredMouseButtonEvents.next;
				PkeMouseButtonEvent ev{};
				ev.sourceSet = handle;
				ev.button = event_mask.button;
				ev.mods = event_mask.mods;
				pk_arr_append_t(&registeredMouseButtonEvents, ev);
			}
			if ((event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_SCROLL) != InputEventHash{0}) {
				action.event_indices[k] = registeredScrollEvents.next;
				PkeScrollEvent ev{};
				ev.sourceSet = handle;
				ev.xMotion = 0;
				ev.yMotion = 0;
				pk_arr_append_t(&registeredScrollEvents, ev);
			}
			if ((event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_WINDOW_FOCUS) != InputEventHash{0}) {
				action.event_indices[k] = registeredWindowFocusEvents.next;
				PkeWindowFocusEvent ev{};
				ev.sourceSet = handle;
				ev.isFocused = lastWindowFocus;
				pk_arr_append_t(&registeredWindowFocusEvents, ev);
			}
		}
	}
}

void PkeInput_DeactivateSet(InputActionSetHandle handle) {
	int64_t index = -1;
	uint32_t count, i;
	count = activeInputSetStack.next;
	for (i = 0; i < count; ++i) {
		if (activeInputSetStack[i] == handle) {
			index = i;
			break;
		}
	}
	assert(index >= 0 && "PkeInput_DeactivateSet - expected InputActionSet to be active");
	assert(index == activeInputSetStack.next - 1 && "PkeInput_UnregisterSet - expected InputActionSet to be the last set active");
	InputActionSetHandle_T handleIndex{static_cast<InputActionSetHandle_T>(handle)};
	auto &set = registeredInputSets[handleIndex];
	for (int64_t i = set.actionCount - 1; i >= 0; --i) {
		PkeInputAction &action = set.actions[i];
		for (int k = 0; k < PKE_INPUT_ACTION_MASK_INDEX_COUNT; ++k) {
			PkeInputEventMask event_mask = action.masks[k];
			if ((event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_ENTER) != InputEventHash{0}) {
				pk_arr_remove_at(&registeredCursorEnterEvents, action.event_indices[k]);
			}
			if ((event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_CURSOR_POS) != InputEventHash{0}) {
				pk_arr_remove_at(&registeredCursorPosEvents, action.event_indices[k]);
			}
			if ((event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_KEY) != InputEventHash{0}) {
				pk_arr_remove_at(&registeredKeyEvents, action.event_indices[k]);
			}
			if ((event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_MOUSE_BUTTON) != InputEventHash{0}) {
				pk_arr_remove_at(&registeredMouseButtonEvents, action.event_indices[k]);
			}
			if ((event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_SCROLL) != InputEventHash{0}) {
				pk_arr_remove_at(&registeredScrollEvents, action.event_indices[k]);
			}
			if ((event_mask.computedHash & PKE_INPUT_HASH_EVENT_TYPE_WINDOW_FOCUS) != InputEventHash{0}) {
				pk_arr_remove_at(&registeredWindowFocusEvents, action.event_indices[k]);
			}
		}
	}
	pk_arr_remove_at(&activeInputSetStack, activeInputSetStack.next-1);
}

bool PkeInput_pke_arr_find_first_handle(void *search_handle, void *list_handle) {
	return reinterpret_cast<InputActionSetHandle *>(search_handle) == reinterpret_cast<InputActionSetHandle *>(list_handle);
}

void PkeInput_UnregisterSet(InputActionSetHandle handle) {
	InputActionSetHandle_T index{static_cast<InputActionSetHandle_T>(handle)};
	assert(index == registeredInputSets.next - 1 && "PkeInput_UnregisterSet - expected InputActionSet to be the last set registered");
	const auto &set = registeredInputSets[index];
	if (pk_arr_find_first_index(&activeInputSetStack, &handle, PkeInput_pke_arr_find_first_handle) != uint32_t(-1)) {
		PkeInput_DeactivateSet(handle);
	}
	pk_delete_arr<PkeInputAction>(set.actions, set.actionCount);
	pk_arr_remove_at(&registeredInputSets, index);
}

pk_arr_t<PkeInputSet> &PkeInput_GetInputSets() {
	return registeredInputSets;
}

void PkeInput_Teardown() {
	glfwSetWindowFocusCallback(window, prevWindowFocusCallback);
	glfwSetScrollCallback(window, prevScrollCallback);
	glfwSetMouseButtonCallback(window, prevMouseButtonCallback);
	glfwSetKeyCallback(window, prevKeyCallback);
	glfwSetCursorPosCallback(window, prevCursorPosCallback);
	glfwSetCursorEnterCallback(window, prevCursorEnterCallback);
	pk_arr_reset(&unhandledCursorPosEvents);
	pk_arr_reset(&unhandledCursorEnterEvents);
	pk_arr_reset(&unhandledKeyEvents);
	pk_arr_reset(&unhandledMouseButtonEvents);
	pk_arr_reset(&unhandledScrollEvents);
	pk_arr_reset(&unhandledWindowFocusEvents);
	pk_arr_reset(&registeredCursorEnterEvents);
	pk_arr_reset(&registeredCursorPosEvents);
	pk_arr_reset(&registeredKeyEvents);
	pk_arr_reset(&registeredMouseButtonEvents);
	pk_arr_reset(&registeredScrollEvents);
	pk_arr_reset(&registeredWindowFocusEvents);
	pk_arr_reset(&activeInputSetStack);
	pk_arr_reset(&registeredInputSets);
}