userName = ("IzzLucas")         -- Username.
passWord = ("2110")         -- Password.
debugPassword = ("dmpass")  -- Password for getting in to debug mode.
triesSecure = true              -- Change to false if you want unlimited tries to open the system.
triesMax = 3                    -- How many tries a user got before the system will close.
destination = "program"         -- Program that will start if username and password is correct.
sleepTime = 100                 -- For how long a user is locked out of the system if he/she keeps ketting password or username wrong. This is in seconds.

triesUsed = 0                   -- Do not change this!
unlocked = false                -- Do not change this!
version = "1.0"                 -- Do not change this!

function authVerify()
 if triesSecure == true then
  if unlocked == false and triesUsed < triesMax then
   write("Username: ")
   userNameInput = read()

   if userNameInput == debugPassword then
    shell.run"clear"
    shell.run"shell"

   else
   write("Password: ")
   passWordInput = read("*")

    if passWordInput == passWord and userNameInput == userName then
     unlocked = true
     correct()

   else
    triesUsed = triesUsed + 1
    textutils.slowPrint("Username or password was not correct.")
    textutils.slowPrint("You have " .. triesMax - triesUsed .. " tries left.")
    authVerify()
   end
  end
 end


  if triesUsed == triesMax or triesUsed > triesMax then
   incorrect()
  end
 end

 if triesSecure == false and unlocked == false then
  write("Username: ")
  userNameInput = read()

  if userNameInput == debugPassword then
  shell.run"clear"
  shell.run"shell"

  else
   write("Password: ")
   passWordInput = read("*")

   if passWordInput == passWord and userNameInput == userName then
    unlocked = true
    correct()

   else
    textutils.slowPrint("Username or password was not correct.")
    authVerify()
   end
  end
 end
end

function correct()
 textutils.slowPrint("Password and username was correct, welcome.")
 textutils.slowPrint(userNameInput)
 print("")
 textutils.slowPrint("Signed in as:")
 textutils.slowPrint(userNameInput)
 sleep(1)
 shell.run(destination)
end

function incorrect()
 textutils.slowPrint("Due to multiple tries, you have been locked")
 textutils.slowPrint(" out from the system.")
 sleep(sleepTime)
 triesUsed = 0
 authVerify()
end

textutils.slowPrint("You need to be logged in:")
authVerify()