package mockid

import "strconv"

func parseExp(exp string) (int, error) {
	if "" == exp {
		exp = "15m"
	}
	mult := 1
	switch exp[len(exp)-1] {
	case 'w':
		mult *= 7
		fallthrough
	case 'd':
		mult *= 24
		fallthrough
	case 'h':
		mult *= 60
		fallthrough
	case 'm':
		mult *= 60
		fallthrough
	case 's':
		// no fallthrough
	default:
		// could be 'k' or 'z', but we assume its empty
		exp += "s"
	}

	num, err := strconv.Atoi(exp[:len(exp)-1])
	if nil != err {
		return 0, err
	}
	return num * mult, nil
}