/* eslint-disable eslint-comments/no-unlimited-disable */
/* eslint-disable */
// @ts-nocheck

import { getTimezoneOffsetInMilliseconds } from '../_lib/getTimezoneOffsetInMilliseconds/index.ts';
import { normalizeDates } from '../_lib/normalizeDates/index.ts';
import { millisecondsInWeek } from '../constants/index.ts';
import { startOfWeek } from '../startOfWeek/index.ts';
import type { ContextOptions, DateArg, LocalizedOptions, WeekOptions } from '../types.ts';

/**
 * The {@link differenceInCalendarWeeks} function options.
 */
export interface DifferenceInCalendarWeeksOptions
  extends LocalizedOptions<'options'>,
    WeekOptions,
    ContextOptions<Date> {}

/**
 * @name differenceInCalendarWeeks
 * @category Week Helpers
 * @summary Get the number of calendar weeks between the given dates.
 *
 * @description
 * Get the number of calendar weeks between the given dates.
 *
 * @param laterDate - The later date
 * @param earlierDate - The earlier date
 * @param options - An object with options.
 *
 * @returns The number of calendar weeks
 *
 * @example
 * // How many calendar weeks are between 5 July 2014 and 20 July 2014?
 * const result = differenceInCalendarWeeks(
 *   new Date(2014, 6, 20),
 *   new Date(2014, 6, 5)
 * )
 * //=> 3
 *
 * @example
 * // If the week starts on Monday,
 * // how many calendar weeks are between 5 July 2014 and 20 July 2014?
 * const result = differenceInCalendarWeeks(
 *   new Date(2014, 6, 20),
 *   new Date(2014, 6, 5),
 *   { weekStartsOn: 1 }
 * )
 * //=> 2
 */
export function differenceInCalendarWeeks(
  laterDate: DateArg<Date> & {},
  earlierDate: DateArg<Date> & {},
  options?: DifferenceInCalendarWeeksOptions | undefined,
): number {
  const [laterDate_, earlierDate_] = normalizeDates(options?.in, laterDate, earlierDate);

  const laterStartOfWeek = startOfWeek(laterDate_, options);
  const earlierStartOfWeek = startOfWeek(earlierDate_, options);

  const laterTimestamp = +laterStartOfWeek - getTimezoneOffsetInMilliseconds(laterStartOfWeek);
  const earlierTimestamp = +earlierStartOfWeek - getTimezoneOffsetInMilliseconds(earlierStartOfWeek);

  return Math.round((laterTimestamp - earlierTimestamp) / millisecondsInWeek);
}

/* eslint-enable */