Receipt API

local Printer = peripheral.find("printer")

local function CheckPrinter()
local Pass = true
if Printer.getInkLevel() == 0 or Printer.getPaperLevel() == 0 then Pass = false end
return Pass
end

local function ReceiptHelp()
term.setBackgroundColor(colors.black)
term.setTextColor(colors.white)
term.clear()
term.setCursorPos(1,1)
print("==Commands==")
print("CheckPrinter : sees if printer is able to print")
print("PrintReceipt : Company,Purchase,Title,Client,Items")
print("==end==")
end

local function PrintReceipt(Company,Purchase,Title,Client,Items)
local Sub = 0
for i = 1, #Items do
  Sub = Sub + Items[i][3]
end
local Taxes = (Sub*GovEc.GetTax("sales"))
local total = Sub + Taxes
local Layout = {"===Receipt===",Company.."    "..Purchase,"Proof of Purchase",os.date(),"to order of "..Client,"-Items-"}
if Client == "n" then Layout[5] = "Certificate" end
for i = 1, #Items do
  Layout[#Layout + 1] = Items[i][1].." x"..Items[i][2].."  $"..Items[i][3]
end
Layout[#Layout + 1] = "Subtotal : $"..Sub
Layout[#Layout + 1] = "taxes : $"..Taxes
Layout[#Layout + 1] = "total : $"..total
Layout[#Layout + 1] = "==Official=Document=="
Layout[#Layout + 1] = "created with authorization of"
Layout[#Layout + 1] = "the State Government and bank"
Printer.newPage()
Printer.setTitle(Title)
Printer.setCursorPos(1,1)
for i = 1, #Layout do
  Printer.setCursorPos(1,i)
  Printer.write(Layout[i])
end
Printer.endPage()
end

return {ReceiptHelp = ReceiptHelp, PrintReceipt = PrintReceipt, CheckPrinter = CheckPrinter}