cash

local maxX = 25
local maxY = 21
local total = 0
local storeName = "Classic's General Store"
local CashierID = {"00000"}
local CashierName = {"ClassicRockFan"}
local i = #CashierID
local cashierName = " "
local restart = true
local valid = nil
local p = peripheral.wrap("printer_1")
local m = peripheral.wrap("monitor_0")
local inventoryItems = {"blah1", "blah2"}
local inventoryPrice = {5, 10}
local inventory = textutils.serialize(inventoryItems)
local printInv = true
function login()
while valid == nil do
  if restart == true then
   term.clear()
   term.setCursorPos(1,1)
  end
 term.write("Enter your cashier ID: ")
 inputID = read()
 print("Validating ID...")
 sleep(1)
 for i = 1, i do
   if inputID == CashierID[i] then
     cashierName = CashierName[i]
     valid = true
   else
     valid = nil
   end
 end
 if valid == true then
   register()
 else
   print("Invalid ID")
   sleep(2)
   restart = true
 end
end
end

function PrintCenter(msg)
 msgLen = string.len(msg)
 screenWidth,_=p.getPageSize()
 xCoords = tonumber(math.ceil((screenWidth/2) - (msgLen/2)))
 _,termY = p.getCursorPos()
 p.setCursorPos(xCoords, termY)
 p.write(msg)
end
function register()
  term.clear()
  term.setCursorPos(1,1)
  print(storeName.."Computer.  Cashier: "..cashierName)
  term.setCursorPos(1,3)
  print("[1]  Print Recepit")
  print("[2]  Do Inventory")
  print("[3]  Logout")
  term.setCursorPos(1,7)
  term.write("What would you like to do: ")
  action = read()
  if action == "1" then
   p.newPage()
   p.setPageTitle(storeName.." Receipt")
   p.setCursorPos(1,maxY-1)
   PrintCenter("Your Cashier was "..cashierName)
   p.setCursorPos(1,maxY)
   PrintCenter("Thank You!")
   while true do
   if printInv == true then
    p.setCursorPos(1,1)
    print(inventory)
    printInv = false
   elseif printInv == false then
    print("Enter the Inventory Number of the purchased Items")
    term.write("(Leave blank to print): ")
    purchased = read()
    if #purchased == 0 then
      printInv = done
    else
     purchased = tonumber(purchased)
     term.write("Enter how many were purchased: ")
     numPurchased = read()
     numBought = tonumber(numpurchased)
     if numBought == nil then
       print("Invalid Entry")
       printInv = true
     else
      price = inventoryPrice[purchased]
      itemTotal = price*numBought
      total = total+itemTotal
      m.clear()
      m.print(total)
      printInv = true
    end
   end
   elseif printInv == done then
     p.endPage()
   end
  end
  elseif action == "2" then
     print("test2")
  elseif action == "3" then
      print("test3")
  else
    print("Invalid Input")
  end
end

--login()
register()