class Station:
 def __init__(self, name, sttype, extid = None, xcoord = None, ycoord = None, prodclass = None):
  self.name = name
  self.sttype = sttype
  self.extid = extid
  self.xcoord = float(xcoord)/1000000
  self.ycoord = float(ycoord)/1000000
  self.prodclass = prodclass

 def useId(self):
  return self.extid or self.name

 def lat(self):
  return self.ycoord

 def lon(self):
  return self.xcoord

class Service:
 def __init__(self, name, depst, deptime, arrst, arrtime, dest = None, deppf = None, currdep = None, arrpf = None, curarr = None):
  self.name = name
  self.dest = dest
  self.depst = depst
  self.deptime = deptime
  self.arrst = arrst
  self.arrtime = arrtime
  self.deppf = deppf
  self.currdep = currdep
  self.arrpf = arrpf
  self.curarr = curarr

 def duration():
  return self.arrtime - self.deptime

class Connection:
 def __init__(self, buyurl = None):
  self.services = []
  self.buyurl = buyurl

 def addService(self, service):
  self.services.append(service)

 def depst(self):
  try:
   return self.services[0].depst
  except:
   return None

 def arrst(self):
  try:
   return self.services[-1].arrst
  except:
   return None

 def deptime(self):
  try:
   return self.services[0].deptime
  except:
   return None

 def arrtime(self):
  try:
   return self.services[-1].arrtime
  except:
   return None

 def currdep(self):
  try:
   return self.services[0].currdep
  except:
   return None

 def currarr(self):
  try:
   return self.services[-1].currarr
  except:
   return None

 def duration(self):
  try:
   return self.services[-1].arrtime - self.services[0].deptime
  except:
   return None