import { createEffect, createSignal, onCleanup } from "solid-js";
import type { ProjectMenuTarget } from "../data/shell.data";

type ProjectContextMenuState = {
	target: ProjectMenuTarget;
	x: number;
	y: number;
};

const readRootPixelToken = (name: string, fallback: number): number => {
	if (typeof window === "undefined") {
		return fallback;
	}

	const value = window.getComputedStyle(document.documentElement).getPropertyValue(name).trim();
	const parsed = Number.parseFloat(value);

	if (!Number.isFinite(parsed)) {
		return fallback;
	}

	if (value.endsWith("px")) {
		return parsed;
	}

	return parsed * 16;
};

const clampMenuPosition = (value: number, min: number, max: number): number => {
	if (max <= min) {
		return min;
	}

	return Math.min(Math.max(value, min), max);
};

export const createProjectContextMenuController = () => {
	const [menuState, setMenuState] = createSignal<ProjectContextMenuState | null>(null);
	let menuRef: HTMLDivElement | undefined;

	const closeMenu = (): void => {
		setMenuState(null);
	};

	const repositionMenu = (): void => {
		if (typeof window === "undefined" || !menuRef) {
			return;
		}

		const current = menuState();

		if (!current) {
			return;
		}

		const viewportPadding = readRootPixelToken("--space-4", 16);
		const rect = menuRef.getBoundingClientRect();
		const nextX = clampMenuPosition(current.x, viewportPadding, window.innerWidth - rect.width - viewportPadding);
		const nextY = clampMenuPosition(current.y, viewportPadding, window.innerHeight - rect.height - viewportPadding);

		if (nextX === current.x && nextY === current.y) {
			return;
		}

		setMenuState({ ...current, x: nextX, y: nextY });
	};

	const openMenu = (event: MouseEvent, target: ProjectMenuTarget): void => {
		event.preventDefault();
		setMenuState({ target, x: event.clientX, y: event.clientY });
	};

	createEffect(() => {
		if (!menuState() || typeof window === "undefined") {
			return;
		}

		const frame = window.requestAnimationFrame(() => {
			repositionMenu();
		});

		const handlePointerDown = (event: PointerEvent): void => {
			if (!menuRef?.contains(event.target as Node)) {
				closeMenu();
			}
		};

		const handleKeyDown = (event: KeyboardEvent): void => {
			if (event.key === "Escape") {
				closeMenu();
			}
		};

		const handleViewportChange = (): void => {
			closeMenu();
		};

		document.addEventListener("pointerdown", handlePointerDown);
		window.addEventListener("resize", handleViewportChange);
		window.addEventListener("scroll", handleViewportChange, true);
		window.addEventListener("keydown", handleKeyDown);

		onCleanup(() => {
			window.cancelAnimationFrame(frame);
			document.removeEventListener("pointerdown", handlePointerDown);
			window.removeEventListener("resize", handleViewportChange);
			window.removeEventListener("scroll", handleViewportChange, true);
			window.removeEventListener("keydown", handleKeyDown);
		});
	});

	return {
		menuState,
		openMenu,
		closeMenu,
		setMenuRef: (element: HTMLDivElement): void => {
			menuRef = element;
		},
	};
};