export type CycleDirection = -1 | 1;

export function cycleOption<T>(values: readonly T[], current: T, direction: CycleDirection): T | undefined {
	if (values.length === 0) return undefined;
	const currentIndex = values.indexOf(current);
	const startIndex = currentIndex >= 0 ? currentIndex : direction === 1 ? -1 : 0;
	return values[(startIndex + direction + values.length) % values.length];
}

export function cycleNumberOption(values: readonly number[], current: number, direction: CycleDirection): number | undefined {
	if (values.length === 0) return undefined;
	if (direction === 1) return values.find((value) => value > current) ?? values[0];
	return values.findLast((value) => value < current) ?? values[values.length - 1];
}