import { toDate } from './toDate.js';
import { constructFrom } from './constructFrom.js';

/**
 * @name addDays
 * @category Day Helpers
 * @summary Add the specified number of days to the given date.
 *
 * @description
 * Add the specified number of days to 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 date to be changed
 * @param amount - The amount of days to be added.
 *
 * @returns The new date with the days added
 *
 * @example
 * // Add 10 days to 1 September 2014:
 * const result = addDays(new Date(2014, 8, 1), 10)
 * //=> Thu Sep 11 2014 00:00:00
 */
function addDays(date, amount) {
  const _date = toDate(date);
  if (isNaN(amount)) return constructFrom(date, NaN);
  if (!amount) {
    // If 0 days, no-op to avoid changing times in the hour before end of DST
    return _date;
  }
  _date.setDate(_date.getDate() + amount);
  return _date;
}

export { addDays, addDays as default };
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