import type { JSX } from "solid-js";

type PointerHandler = NonNullable<JSX.DOMAttributes<Element>["onPointerDown"]>;

type LongPressGestureOptions = {
	onLongPress: () => void;
	delay?: number;
	movementThreshold?: number;
};

type LongPressGestureHandlers = {
	onPointerDown: PointerHandler;
	onPointerMove: PointerHandler;
	onPointerUp: PointerHandler;
	onPointerCancel: PointerHandler;
	onPointerLeave: PointerHandler;
};

export const createLongPressGesture = (options: LongPressGestureOptions): LongPressGestureHandlers => {
	let timeoutId: number | undefined;
	let originX = 0;
	let originY = 0;

	const delay = options.delay ?? 420;
	const movementThreshold = options.movementThreshold ?? 10;

	const clearPendingLongPress = (): void => {
		if (typeof timeoutId === "number") {
			window.clearTimeout(timeoutId);
			timeoutId = undefined;
		}
	};

	const onPointerDown: PointerHandler = (event): void => {
		// Mobile long-press should only respond to the primary touch/pen pointer.
		if (event.pointerType === "mouse" || !event.isPrimary) {
			return;
		}

		originX = event.clientX;
		originY = event.clientY;
		clearPendingLongPress();
		timeoutId = window.setTimeout(() => {
			timeoutId = undefined;
			options.onLongPress();
		}, delay);
	};

	const onPointerMove: PointerHandler = (event): void => {
		if (typeof timeoutId !== "number") {
			return;
		}

		const deltaX = Math.abs(event.clientX - originX);
		const deltaY = Math.abs(event.clientY - originY);

		if (deltaX > movementThreshold || deltaY > movementThreshold) {
			clearPendingLongPress();
		}
	};

	const onPointerUp: PointerHandler = (): void => {
		clearPendingLongPress();
	};

	return {
		onPointerDown,
		onPointerMove,
		onPointerUp,
		onPointerCancel: onPointerUp,
		onPointerLeave: onPointerUp,
	};
};