Mag cards

os.loadAPI("SHA")
os.pullEvent = os.pullEventRaw

redstone.setBundledOutput("left", colors.white)
math.randomseed(os.time())

term.clear()
term.setCursorPos(1,1)
print("Legoman Technologies door lock V1.0")
print("Thank you to tomas1666 for his SHA1 code")

modem = peripheral.wrap("top")

if modem == nil then
  error("Modem not on top")
end

if modem.isPresentRemote("mag card reader_0") then
  reader = peripheral.wrap("mag card reader_0")
  print("Card reader connected")
else
  error("Mag-card reader not found")
end

if modem.isPresentRemote("monitor_0") then
  monitor = peripheral.wrap("monitor_0")
  print("Monitor connected")
else
  error("Monitor not found")
end

hashedPw = "Put the hashed admin password here"
cardsFilePath = "Cards"
cards = {""}
chars = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z","0","1","2","3","4","5","6","7","8","9", "@", "#", "$", "%", "&", "?"}
newpass = ""
cardNum = 0

if fs.exists(cardsFilePath) then
  cardsFile = fs.open(cardsFilePath, "r")
  cards = textutils.unserialize(cardsFile.readAll())
  cardsFile.close()
end

while true do
  admin = false

  monitor.clear()
  monitor.setCursorPos(1,1)
  monitor.write("Welcome to Legoman Industries! Please insert a card!")
  reader.setInsertCardLight(true)


  event, p1,p2,p3 = os.pullEvent()

  if event == "mag_swipe" then
    if SHA.SHA1_2(p1) == hashedPw then
      admin = true
    end
    for x = 1, #cards do
      if SHA.SHA1_2(p1) == cards[x] then
        reader.setInsertCardLight(false)
        redstone.setBundledOutput("left", 0)
        os.sleep(3)
        redstone.setBundledOutput("left", colors.white)
        reader.setInsertCardLight(true)
        break
      end
    end
  end
  if admin == true then
    reader.setInsertCardLight(false)
    monitor.clear()
    monitor.setCursorPos(1,1)
    monitor.write("Admin granted! Insert blank card!")
    for z = 1,15 do
      case = math.random(1,2) -- randomly choose case (caps or lower)
      a = math.random(1,#chars) -- randomly choose a character from the "char" array
      if case == 1 then
        x=string.upper(chars[a]) -- uppercase if case = 1
      elseif case == 2 then
        x=string.lower(chars[a]) -- lowercase if case = 2
      end
      newpass = newpass..x
    end
    reader.setInsertCardLight(true)
    cardNum = #cards
    print(reader.beginWrite(newpass, cardNum..""))
    table.insert(cards, SHA.SHA1_2(newpass))

    while reader.isWaiting() do
    end

    reader.setInsertCardLight(false)
    monitor.clear()
    monitor.setCursorPos(1,1)
    monitor.write("New card created!")
    newpass = ""
  end

  os.sleep(1)

  cardsFile = fs.open(cardsFilePath, "w")
  cardsFile.write(textutils.serialize(cards))
  cardsFile.close()


end