def discretionary_leave
    self.tokens.discretionary.map {|time| time.hours}.sum
  end

  def accrued_annual_leave(year=current_fiscal_year)
    RateInfo.new(self, year).accrued_leave + discretionary_leave
  end

  def net_annual_leave(year=current_fiscal_year)
    accrued_annual_leave(year) - used_annual_leave(year)
  end