Card Reader Vendor Register script

--NEW card reading system.
--this program asks for the item being bought, then asks for card. once swiped, the script will have the cash transfered to the correct Parties

local OwnerAccount = nil
local ItemsSold = {...}
local ItemCost = {...}

local reader = peripheral.find("reader")

start()

local function start()
if fs.exists("Config") == false then
  Config("Save")
else
  Config("Load")
end
Menu()
end

local function Menu()
term.clear()
term.setCursorPos(1,1)
print("WELCOME!")
print("Options")
print("1 - Purchase")
print("2 - Settings")
repeat
  local event, key = os.pullEvent("key")
until event == key
if key == keys.1 then
  PurchaseManager()
elseif key == keys.two then
  SettingsMenu()
end
end

local function PurchaseManager()
term.clear()
term.setCursorPos(1,1)
print("Please enter the Number Corsponding to the Item desired. press enter to save")
print("1= "...ItemsSold[1]...", 2= "...ItemsSold[2]...", 3= "...ItemsSold[3])
print("4= "...ItemsSold[4]...", 5= "...ItemsSold[5]...", 6= "...ItemsSold[6])
print("7= "...ItemsSold[7]...", 8= "...ItemsSold[8]...", 9= "...ItemsSold[9])
local Amount = 0
local input = read()
repeat
  local event, key = os.pullEvent("key")
  Amount = Amount + ItemCost[key]
  term.setCursorPos(1,8)
  term.clearLine()
  term.write(input)
until key == keys.enter
term.clear()
term.setCursorPos(1,1)
print("please Insert Card to continue")
local event, data = os.pullEvent("mag_swipe")
local DA = data
local Key = DA[1]
local AccountID = DA[2]
shell.run("BankingAccess_Client",Amount,AccountID,Key,OwnerAccount)
print("Now Attempting Transfer, once transfer is")
print("complete, you will be brought back to the menu")
sleep(10)
Menu()
end

local function SettingsMenu()
term.clear()
term.setCursorPos(1,1)
print("SETTINGS")
print("Options")
print("1-Add Item")
print("2-Remove Item")
print("3-AccountID")
print("4-Menu")
repeat
  local event, key = os.pullEvent("key")
until key == keys.one or key == keys.two or key == keys.three or key == keys.four
if key == keys.1 then
  Settings_ItemMenu("Add")
elseif key == keys.2 then
  Settings_ItemMenu("Remove")
elseif key == keys.3 then
  Settings_Account()
elseif key == keys.4 then
  Menu()
end
end

local function Settings_ItemMenu(type)
term.clear()
term.setCursorPos(1,1)
print("item menu - "...type)
print("Please enter Number corsponding to the item")
print(ItemsSold)
local event, key = os.pullEvent("key")
print("now "...type..." Item")
if type == "Remove" then
  ItemsSold[key] = nil
  print("Item Deleted")
elseif type == "Add" then
  print("Please now type Name of item, once done press enter")
  local input = read()
  repeat
    local event, key = os.pullEvent("key")
  until key == keys.enter
  ItemsSold[key] = input
  print("Item Added")
end
Config("Save")
sleep(5)
SettingsMenu()
end

local function Settings_Account()
term.clear()
term.setCursorPos(1,1)
print("Account Management")
print("please enter Account ID")
print("then press enter to save")
local input = read()
repeat
  local event, key = os.pullEvent("key")
until key == keys.enter
OwnerAccount = input
Config("Save")
print("Saved")
sleep(5)
SettingsMenu()
end

local function Config(Mode)
local file = fs.open("Config","a")
if Mode == "Save" then
  file.clear()
  file.setCursorPos(1,1)
  file.writeLine(OwnerAccount)
  file.writeLine(ItemsSold)
  file.writeLine(ItemCost)
elseif Mode == "load" then
  OwnerAccount = file.readLine(1)
  ItemsSold = {...file.readLine(2)...}
  ItemCost = {...file.readLine(3)...}
end
file.close()
end