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import { getDate } from "./getDate.mjs";
import { getDay } from "./getDay.mjs";
import { startOfMonth } from "./startOfMonth.mjs";
import { getDefaultOptions } from "./_lib/defaultOptions.mjs";

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

/**
 * @name getWeekOfMonth
 * @category Week Helpers
 * @summary Get the week of the month of the given date.
 *
 * @description
 * Get the week of the month of the given date.
 *
 * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
 *
 * @param date - The given date
 * @param options - An object with options.
 *
 * @returns The week of month
 *
 * @example
 * // Which week of the month is 9 November 2017?
 * const result = getWeekOfMonth(new Date(2017, 10, 9))
 * //=> 2
 */
export function getWeekOfMonth(date, options) {
  const defaultOptions = getDefaultOptions();
  const weekStartsOn =
    options?.weekStartsOn ??
    options?.locale?.options?.weekStartsOn ??
    defaultOptions.weekStartsOn ??
    defaultOptions.locale?.options?.weekStartsOn ??
    0;

  const currentDayOfMonth = getDate(date);
  if (isNaN(currentDayOfMonth)) return NaN;

  const startWeekDay = getDay(startOfMonth(date));

  let lastDayOfFirstWeek = weekStartsOn - startWeekDay;
  if (lastDayOfFirstWeek <= 0) lastDayOfFirstWeek += 7;

  const remainingDaysAfterFirstWeek = currentDayOfMonth - lastDayOfFirstWeek;
  return Math.ceil(remainingDaysAfterFirstWeek / 7) + 1;
}

// Fallback for modularized imports:
export default getWeekOfMonth;