import { daysInMonth } from '../units/month'
import { YEAR, MONTH, DATE, HOUR, MINUTE, SECOND, MILLISECOND, WEEK, WEEKDAY } from '../units/constants'
import getParsingFlags from '../create/parsing-flags'

export default function checkOverflow (m) {
  var overflow
  var a = m._a

  if (a && getParsingFlags(m).overflow === -2) {
    overflow =
            a[MONTH] < 0 || a[MONTH] > 11 ? MONTH
              : a[DATE] < 1 || a[DATE] > daysInMonth(a[YEAR], a[MONTH]) ? DATE
                : a[HOUR] < 0 || a[HOUR] > 24 || (a[HOUR] === 24 && (a[MINUTE] !== 0 || a[SECOND] !== 0 || a[MILLISECOND] !== 0)) ? HOUR
                  : a[MINUTE] < 0 || a[MINUTE] > 59 ? MINUTE
                    : a[SECOND] < 0 || a[SECOND] > 59 ? SECOND
                      : a[MILLISECOND] < 0 || a[MILLISECOND] > 999 ? MILLISECOND
                        : -1

    if (getParsingFlags(m)._overflowDayOfYear && (overflow < YEAR || overflow > DATE)) {
      overflow = DATE
    }
    if (getParsingFlags(m)._overflowWeeks && overflow === -1) {
      overflow = WEEK
    }
    if (getParsingFlags(m)._overflowWeekday && overflow === -1) {
      overflow = WEEKDAY
    }

    getParsingFlags(m).overflow = overflow
  }

  return m
}
