[MC-CC] Tickets seller

---- Ticket selling machine
---- Tickets are being sold as labeled floppys
---- and can be further used on station to get a train to a demanded destination
-- os.pullEvent = os.pullEventRaw
---- Config
-- Sides of components
sides = {}
sides[1] = "right" -- Monitor
sides[2] = "back"  -- Checking the payment
sides[3] = "top"   -- Sending the floppy
sides[4] = "left"  -- Floppy side
-- Filenames
files = {}
files[1] = "infopanel" -- Monitor text
files[2] = "stations"  -- Station list
-- Monitor on the right is being used as a information panel
mon = peripheral.wrap(sides[1])

---- Functions
-- Writing on information panel
function writeInfo()
 monX, monY = mon.getSize()
 mon.clear()
 file = fs.open(files[1], "r")
 x = file.readLine()
 i = 1
 while not (x == nil) do
  if not(i > monY) then
   mon.setCursorPos(1,i)
   mon.write(x)
   i = i+1
  end
  x = file.readLine()
 end
 file.close()
end
-- Get ticket
function getTicket(station)
 if not disk.isPresent(sides[4]) then
  rs.setOutput(sides[3], true)
  os.sleep(1)
  rs.setOutput(sides[3], false)
 elseif disk.getLabel(sides[4]) == "cmd:shutdown" then
  shell.exit()
 end
 write("Wybrano stacje " .. station .. "\n")
 disk.setLabel(sides[4], station)
 disk.eject(sides[4])
end
-- Stations validate
function validateInput(input)
 if input == "cmd:shutdown" then
  return true
 end
 file = fs.open(files[2], "r")
 x = file.readLine()
 input = string.lower(input)
 while not (x == nil) do
  if x == input then
   return true
  end
  x = file.readLine()
 end
 return false
end


---- Main program
writeInfo()
term.clear()
term.setCursorPos(1,1)
write("Prosze umiescic 1 sticky resin w skrzyni na dole\n")
while true do
 if rs.getInput(sides[2]) then
  term.clear()
  term.setCursorPos(1,1)
  write("Prosze podac nazwe stacji docelowej:\n")
  input = read()
  while not validateInput(input) do
   write("Prosze podac PRAWIDLOWA nazwe stacji docelowej!\n")
   input = read()
  end
  getTicket(input)
  write("Dziekujemy za skorzystanie z naszych uslug! Zapraszamy ponownie! \n")
  write("Bilet powinien znajdowac sie w twoim ekwipunku!\n")
  write("W przypadku, gdy Twoj ekwipunek jest pelny bilet znajduje sie na ziemi\n")
  os.sleep(2)
  term.clear()
  term.setCursorPos(1,1)
  write("Prosze umiescic 1 sticky resin w skrzyni na dole\n")
 end
 os.sleep(1)
end