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import addDays from "../addDays/index.js";
import differenceInCalendarDays from "../differenceInCalendarDays/index.js";
import isSameDay from "../isSameDay/index.js";
import isValid from "../isValid/index.js";
import isWeekend from "../isWeekend/index.js";
import toDate from "../toDate/index.js";
import requiredArgs from "../_lib/requiredArgs/index.js";
import toInteger from "../_lib/toInteger/index.js";
/**
* @name differenceInBusinessDays
* @category Day Helpers
* @summary Get the number of business days between the given dates.
*
* @description
* Get the number of business day periods between the given dates.
* Business days being days that arent in the weekend.
* Like `differenceInCalendarDays`, the function removes the times from
* the dates before calculating the difference.
*
* @param {Date|Number} dateLeft - the later date
* @param {Date|Number} dateRight - the earlier date
* @returns {Number} the number of business days
* @throws {TypeError} 2 arguments required
*
* @example
* // How many business days are between
* // 10 January 2014 and 20 July 2014?
* const result = differenceInBusinessDays(
* new Date(2014, 6, 20),
* new Date(2014, 0, 10)
* )
* //=> 136
*
* // How many business days are between
* // 30 November 2021 and 1 November 2021?
* const result = differenceInBusinessDays(
* new Date(2021, 10, 30),
* new Date(2021, 10, 1)
* )
* //=> 21
*
* // How many business days are between
* // 1 November 2021 and 1 December 2021?
* const result = differenceInBusinessDays(
* new Date(2021, 10, 1),
* new Date(2021, 11, 1)
* )
* //=> -22
*
* // How many business days are between
* // 1 November 2021 and 1 November 2021 ?
* const result = differenceInBusinessDays(
* new Date(2021, 10, 1),
* new Date(2021, 10, 1)
* )
* //=> 0
*/
export default function differenceInBusinessDays(dirtyDateLeft, dirtyDateRight) {
requiredArgs(2, arguments);
var dateLeft = toDate(dirtyDateLeft);
var dateRight = toDate(dirtyDateRight);
if (!isValid(dateLeft) || !isValid(dateRight)) return NaN;
var calendarDifference = differenceInCalendarDays(dateLeft, dateRight);
var sign = calendarDifference < 0 ? -1 : 1;
var weeks = toInteger(calendarDifference / 7);
var result = weeks * 5;
dateRight = addDays(dateRight, weeks * 7);
// the loop below will run at most 6 times to account for the remaining days that don't makeup a full week
while (!isSameDay(dateLeft, dateRight)) {
// sign is used to account for both negative and positive differences
result += isWeekend(dateRight) ? 0 : sign;
dateRight = addDays(dateRight, sign);
}
return result === 0 ? 0 : result;
}
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