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import requiredArgs from '../_lib/requiredArgs/index'
import { Duration } from '../types'
// Leap year occures every 4 years, except for years that are divisable by 100 and not divisable by 400.
// 1 mean year = (365+1/4-1/100+1/400) days = 365.2425 days
const daysInYear = 365.2425
/**
* @name milliseconds
* @category Millisecond Helpers
* @summary
* Returns the number of milliseconds in the specified, years, months, weeks, days, hours, minutes and seconds.
*
* @description
* Returns the number of milliseconds in the specified, years, months, weeks, days, hours, minutes and seconds.
*
* One years equals 365.2425 days according to the formula:
*
* > Leap year occures every 4 years, except for years that are divisable by 100 and not divisable by 400.
* > 1 mean year = (365+1/4-1/100+1/400) days = 365.2425 days
*
* One month is a year divided by 12.
*
* @param {Duration} duration - the object with years, months, weeks, days, hours, minutes and seconds to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
* @returns {number} the milliseconds
* @throws {TypeError} 1 argument required
*
* @example
* // 1 year in milliseconds
* milliseconds({ years: 1 })
* //=> 31556952000
*
* // 3 months in milliseconds
* milliseconds({ months: 3 })
* //=> 7889238000
*/
export default function milliseconds({
years,
months,
weeks,
days,
hours,
minutes,
seconds,
}: Duration): number {
requiredArgs(1, arguments)
let totalDays = 0
if (years) totalDays += years * daysInYear
if (months) totalDays += months * (daysInYear / 12)
if (weeks) totalDays += weeks * 7
if (days) totalDays += days
let totalSeconds = totalDays * 24 * 60 * 60
if (hours) totalSeconds += hours * 60 * 60
if (minutes) totalSeconds += minutes * 60
if (seconds) totalSeconds += seconds
return Math.round(totalSeconds * 1000)
}
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