import { clamp } from "./clamp";
import { replaceArrayItemAtIndex } from "./replace-array-item-at-index";

/**
 * Resolves a candidate slider value for the thumb at `index`, clamping it
 * into `[min, max]` and — for range sliders — into the window bounded by the
 * thumb's immediate neighbours. The return type is scalar or array
 * depending on the `range` flag (matches the React source).
 */
export function getSliderValue(
	valueInput: number,
	index: number,
	min: number,
	max: number,
	range: boolean,
	values: readonly number[],
): number | number[] {
	let newValue: number | number[] = valueInput;

	newValue = clamp(newValue, min, max);

	if (range) {
		newValue = replaceArrayItemAtIndex(
			values,
			index,
			// Bound the new value to the thumb's neighbours.
			clamp(
				newValue,
				values[index - 1] || Number.NEGATIVE_INFINITY,
				values[index + 1] || Number.POSITIVE_INFINITY,
			),
		);
	}

	return newValue;
}