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

/**
 * @name quartersToYears
 * @category Conversion Helpers
 * @summary Convert number of quarters to years.
 *
 * @description
 * Convert a number of quarters to a full number of years.
 *
 * @param {number} quarters - number of quarters to be converted
 *
 * @returns {number} the number of quarters converted in years
 * @throws {TypeError} 1 argument required
 *
 * @example
 * // Convert 8 quarters to years
 * const result = quartersToYears(8)
 * //=> 2
 *
 * @example
 * // It uses floor rounding:
 * const result = quartersToYears(11)
 * //=> 2
 */
export default function quartersToYears(quarters: number): number {
  requiredArgs(1, arguments)
  const years = quarters / quartersInYear
  return Math.floor(years)
}