import { startOfISOWeekYear } from "./startOfISOWeekYear.js";

import { normalizeDates } from "./_lib/normalizeDates.js";

/**
 * The {@link isSameISOWeekYear} function options.
 */

/**
 * @name isSameISOWeekYear
 * @category ISO Week-Numbering Year Helpers
 * @summary Are the given dates in the same ISO week-numbering year?
 *
 * @description
 * Are the given dates in the same ISO week-numbering year?
 *
 * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
 *
 * @param laterDate - The first date to check
 * @param earlierDate - The second date to check
 * @param options - An object with options
 *
 * @returns The dates are in the same ISO week-numbering year
 *
 * @example
 * // Are 29 December 2003 and 2 January 2005 in the same ISO week-numbering year?
 * const result = isSameISOWeekYear(new Date(2003, 11, 29), new Date(2005, 0, 2))
 * //=> true
 */
export function isSameISOWeekYear(laterDate, earlierDate, options) {
  const [laterDate_, earlierDate_] = normalizeDates(
    options?.in,
    laterDate,
    earlierDate,
  );
  return +startOfISOWeekYear(laterDate_) === +startOfISOWeekYear(earlierDate_);
}

// Fallback for modularized imports:
export default isSameISOWeekYear;