punchcard

class PunchCard:
  hourly_rate  = 47.82
  notify_interval = 3600.0
  shift_start = 0
  lunch_start = 0
  lunch_mins = 0
  timer = 0

  def calculate_cost():
    start = to_mins(shift_start)
    now = to_mins(rounded_time())
    mins = start - now - self.lunch
    cost = dbl(hourly_rate/60 * mins)

  def trigger_lunch():
    if self.lunch_start:

    else:
     self.lunch_start = self.rounded_time()
  
  def notify()

  def trigger_notify():
    if self.timer:
      self.timer = 0
    else:
      notify()