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import toDate from '../toDate/index'
import requiredArgs from '../_lib/requiredArgs/index'
/**
* @name eachDayOfInterval
* @category Interval Helpers
* @summary Return the array of dates within the specified time interval.
*
* @description
* Return the array of dates within the specified time interval.
*
* ### v2.0.0 breaking changes:
*
* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
*
* - The function was renamed from `eachDay` to `eachDayOfInterval`.
* This change was made to mirror the use of the word "interval" in standard ISO 8601:2004 terminology:
*
* ```
* 2.1.3
* time interval
* part of the time axis limited by two instants
* ```
*
* Also, this function now accepts an object with `start` and `end` properties
* instead of two arguments as an interval.
* This function now throws `RangeError` if the start of the interval is after its end
* or if any date in the interval is `Invalid Date`.
*
* ```javascript
* // Before v2.0.0
*
* eachDay(new Date(2014, 0, 10), new Date(2014, 0, 20))
*
* // v2.0.0 onward
*
* eachDayOfInterval(
* { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) }
* )
* ```
*
* @param {Interval} interval - the interval. See [Interval]{@link https://date-fns.org/docs/Interval}
* @param {Object} [options] - an object with options.
* @param {Number} [options.step=1] - the step to increment by. The value should be more than 1.
* @returns {Date[]} the array with starts of days from the day of the interval start to the day of the interval end
* @throws {TypeError} 1 argument required
* @throws {RangeError} `options.step` must be a number greater than 1
* @throws {RangeError} The start of an interval cannot be after its end
* @throws {RangeError} Date in interval cannot be `Invalid Date`
*
* @example
* // Each day between 6 October 2014 and 10 October 2014:
* const result = eachDayOfInterval({
* start: new Date(2014, 9, 6),
* end: new Date(2014, 9, 10)
* })
* //=> [
* // Mon Oct 06 2014 00:00:00,
* // Tue Oct 07 2014 00:00:00,
* // Wed Oct 08 2014 00:00:00,
* // Thu Oct 09 2014 00:00:00,
* // Fri Oct 10 2014 00:00:00
* // ]
*/
export default function eachDayOfInterval(
dirtyInterval: Interval,
options?: { step?: number }
): Date[] {
requiredArgs(1, arguments)
const interval = dirtyInterval || {}
const startDate = toDate(interval.start)
const endDate = toDate(interval.end)
const endTime = endDate.getTime()
// Throw an exception if start date is after end date or if any date is `Invalid Date`
if (!(startDate.getTime() <= endTime)) {
throw new RangeError('Invalid interval')
}
const dates = []
const currentDate = startDate
currentDate.setHours(0, 0, 0, 0)
const step = options && 'step' in options ? Number(options.step) : 1
if (step < 1 || isNaN(step))
throw new RangeError('`options.step` must be a number greater than 1')
while (currentDate.getTime() <= endTime) {
dates.push(toDate(currentDate))
currentDate.setDate(currentDate.getDate() + step)
currentDate.setHours(0, 0, 0, 0)
}
return dates
}
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