import requiredArgs from '../_lib/requiredArgs/index'
import { daysInWeek } from '../constants/index'

/**
 * @name daysToWeeks
 * @category Conversion Helpers
 * @summary Convert days to weeks.
 *
 * @description
 * Convert a number of days to a full number of weeks.
 *
 * @param {number} days - number of days to be converted
 *
 * @returns {number} the number of days converted in weeks
 * @throws {TypeError} 1 argument required
 *
 * @example
 * // Convert 14 days to weeks:
 * const result = daysToWeeks(14)
 * //=> 2
 *
 * @example
 * // It uses floor rounding:
 * const result = daysToWeeks(13)
 * //=> 1
 */
export default function daysToWeeks(days: number): number {
  requiredArgs(1, arguments)
  const weeks = days / daysInWeek
  return Math.floor(weeks)
}