Login System With User Access Levels

    local function readN(len, replaceChar)
      len = len or 12
      local input=""
      local key = 0
      term.setCursorBlink(true)
      repeat
        local e,p1 = os.pullEvent()
        if e=="char" then
          if #input < len then
            input = input .. p1
            term.write(replaceChar or p1)
          end
        elseif e=="key" and p1==keys.backspace and #input > 0 then
          input = input:sub(1,#input-1)
          local x,y = term.getCursorPos()
          term.setCursorPos(x-1,y)
          term.write(" ")
          term.setCursorPos(x-1,y)
        end
      until p1==keys.enter
      term.setCursorBlink(false)
      return input
    end

    sid = 0
    lockdown = 0
    actc = ""
    actpw = ""
    actpc = ""
    userlog = ""
    userpas = ""
    puselog = ""
    prog = 0

    function clear()
    term.clear()
    term.setCursorPos(1,1)
    end

    function menu(id, text)
      if sid == id then
        write">> "
      else
        write"   "
      end
      print(text)
    end

    if not fs.exists("pending") then
      shell.run("mkdir pending")
      if not fs.exists("users") then
        shell.run("mkdir users")
      else
      end
    elseif not fs.exists("users") then
      shell.run("mkdir users")
    end

    if not fs.exists("motdu") then
      file = fs.open("motdu", "w")
      file.writeLine("CONTACT ADMIN TO SET MOTD.")
      file.close()
      if not fs.exists("motda") then
        file = fs.open("motda", "w")
        file.writeLine("PLEASE SET USER AND ADMIN MOTD MESSAGES.")
        file.close()
      end
    else
      if not fs.exists("motda") then
        file = fs.open("motda", "w")
        file.writeLine("PLEASE SET ADMIN MOTD MESSAGE.")
        file.close()
      end
    end

    clear()
    while prog == 0 do
    --os.pullEvent = os.pullEventRaw
    rep1 = 0
    rep2 = 0
    rep3 = 0
    rep4 = 0
    rep5 = 0
    rep6 = 0
    ioerror = 0
    term.setCursorPos(1, 12)
    term.clearLine()
    term.setCursorPos(1, 13)
    term.clearLine()
    term.setCursorPos(1, 14)
    term.clearLine()
    term.setCursorPos(1, 15)
    term.clearLine()
    term.setCursorPos(1, 16)
    term.clearLine()
    term.setCursorPos(1, 17)
    term.clearLine()
    term.setCursorPos(1,1)
    print("|################################################|")
    print("|              BOUTECH SYSTEM LOGIN              |")
    print("|                OS Version : 1.3                |")
    print("|################################################|")
    term.setCursorPos(13,7)
    print("|------------------------|")
    term.setCursorPos(13,8)
    print("|                        |")
    term.setCursorPos(13,9)
    print("|                        |")
    term.setCursorPos(13,10)
    print("|                        |")
    term.setCursorPos(13,11)
    print("|------------------------|")
    term.setCursorPos(16,8)
    menu(0, "Login")
    term.setCursorPos(16,9)
    menu(1, "Create Account")
    term.setCursorPos(16,10)
    menu(2, "Shutdown")
    event, key = os.pullEvent("key")

    if key == 200 then
      if sid == 0 then
        sid = sid+2
      elseif sid == 1 then
        sid = sid-1
      elseif sid == 2 then
        sid = sid-1
      end
    elseif key == 208 then
      if sid == 2 then
        sid = sid-2
      elseif sid == 1 then
        sid = sid+1
      elseif sid == 0 then
        sid = sid+1
      end
    elseif key == 28 then
      if sid == 0 then
        term.setCursorPos(13, 12)
        print("|   Enter Credentials.   |")
        term.setCursorPos(13, 13)
        print("|                        |")
        term.setCursorPos(13, 14)
        print("|                        |")
        term.setCursorPos(13, 15)
        print("|                        |")
        term.setCursorPos(13, 16)
        print("|                        |")
        term.setCursorPos(13, 17)
        print("|------------------------|")
        sleep(1)

        while rep5 == 0 do
          sleep(1)
          term.setCursorPos(1, 14)
          term.clearLine()
          term.setCursorPos(1, 16)
          term.clearLine()
          term.setCursorPos(13, 16)
          print("|                        |")
          term.setCursorPos(13, 14)
          print("|                        |")
          term.setCursorPos(15, 14)
          write("Username: ")
          userlog = readN()
          if userlog == "adminovrride" then
            sleep(1)
            rnd = math.random(100, 500)
            term.setCursorPos(1, 18)
            term.clearLine()
            term.setCursorPos (17, 18)
            print("Override Code: ".. rnd)
            apass = tostring((rnd + 11) * 83)
            term.setCursorPos(1, 16)
            term.clearLine()
            term.setCursorPos(13, 16)
            print("|                        |")
            term.setCursorPos(15, 16)
            write("Password: ")
            ovrpass = readN(12, "*")
            if ovrpass == apass then
              term.setCursorPos(1, 18)
              term.clearLine()
              term.setCursorPos(15, 18)
              print("Override Successful...")
              sleep(1)
              term.clear()
              term.setCursorPos(1, 1)
              rep5 = rep5+1
              rep6 = rep6+1
              prog = prog+1
            else
              term.setCursorPos(1, 18)
              term.clearLine()
              term.setCursorPos(15, 18)
              print("  Override Failed...")
              sleep(1)
              rep5 = rep5+1
              rep6 = rep6+1
              sid = 0
            end
          else
            if userlog == "" then
              term.setCursorPos(1, 18)
              term.clearLine()
              term.setCursorPos(18, 18)
              print("Invalid Username")
              sleep(1)
              ioerror = ioerror+1
              if ioerror == 3 then
                rep5 = rep5+1
                rep6 = rep6+1
                sid = 0
              else
              end
            else
              ioerror = 0
              ulog = fs.exists("users/".. userlog)
              if ulog == true then
                term.setCursorPos(1, 16)
                term.clearLine()
                term.setCursorPos(13, 16)
                print("|                        |")
                term.setCursorPos(15, 16)
                write("Password: ")
                sleep(1)
                userpas = readN(12, "*")
                if userpas == "" then
                  term.setCursorPos(1, 18)
                  term.clearLine()
                  term.setCursorPos(15, 18)
                  print("Invalid Password Entry")
                  sleep(1)
                  ioerror = ioerror+1
                  term.setCursorPos(1, 18)
                  term.clearLine()
                  if ioerror == 3 then
                    rep5 = rep5+1
                    sid = 0
                  else
                  end
                else
                  ulog = io.open("users/".. userlog, "r") or nil
                  pass = ulog and ulog:read()
                  ulog:close()
                  if (pass and pass==userpas) then
                    term.setCursorPos(1, 18)
                    term.clearLine()
                    term.setCursorPos(16, 18)
                    print("  Login Success...")
                    currentw = fs.open("current", "w")
                    accessr = fs.open("users/".. userlog, "r")
                    accessl = accessr.readLine() and accessr.readLine()
                    currentw.writeLine(userlog)
                    currentw.writeLine(accessl)
                    currentw.close()
                    accessr.close()
                    rep5 = rep5+1
                    rep6 = rep6+1
                    prog = prog+1
                    sid = 0
                    sleep(1)
                    shell.run("system")
                  else
                    if lockdown < 2 then
                      term.setCursorPos(1, 18)
                      term.clearLine()
                      term.setCursorPos(16, 18)
                      print("   Wrong Password")
                      sleep(1)
                      if userlog == puselog then
                        lockdown = lockdown+1
                      else
                        lockdown = 0
                        puselog = userlog
                        lockdown = lockdown+1
                      end
                    else
                      while rep6 == 0 do
                        term.setCursorPos(15, 18)
                        rnd = tostring(math.random(101, 999))
                        if not fs.exists("pending/".. rnd) then
                          fs.move("users/".. userlog, "pending/".. rnd)
                          term.setCursorPos(1, 18)
                          term.clearLine()
                          term.setCursorPos(15, 18)
                          print(" Lockdown Ref #: "..rnd)
                          sleep(1)
                          ulog = fs.open("pending/".. rnd, "a")
                          ulog.writeLine("Username: ".. userlog)
                          ulog.close()
                          rep6 = rep6+1
                          rep5 = rep5+1
                          sid = 0
                        else
                        end
                      end
                    end
                  end
                end
              else
                term.setCursorPos(1, 18)
                term.clearLine()
                term.setCursorPos(14, 18)
                print("  Bad/Unknown Username")
                sleep(1)
              end
            end
          end
        end
      elseif sid == 1 then
        term.setCursorPos(13, 12)
        print("|  Submit Account Info.  |")
        term.setCursorPos(13, 13)
        print("|                        |")
        term.setCursorPos(13, 14)
        print("|                        |")
        term.setCursorPos(13, 15)
        print("|                        |")
        term.setCursorPos(13, 16)
        print("|                        |")
        term.setCursorPos(13, 17)
        print("|------------------------|")

        while rep1 == 0 do
          term.setCursorPos(1, 14)
          term.clearLine()
          term.setCursorPos(13, 14)
          print("|                        |")
          term.setCursorPos(15, 14)
          write("Username: ")
          sleep(1)
          input = readN()
          actc = input
          actex = fs.exists("users/".. actc)
          if input == "adminovrride" then
            term.setCursorPos(1, 18)
            term.clearLine()
            term.setCursorPos(18, 18)
            print("Invalid Username")
            sleep(1)
            ioerror = ioerror+1
            if ioerror == 3 then
              rep1 = 1
              rep2 = 1
              rep3 = 1
              sid = 0
            else
            end
          else
            if input == "" then
              term.setCursorPos(1, 18)
              term.clearLine()
              term.setCursorPos(18, 18)
              print("Invalid Username")
              sleep(1)
              ioerror = ioerror+1
              if ioerror == 3 then
                rep1 = 1
                rep2 = 1
                rep3 = 1
                sid = 0
              else
              end
            elseif actex == true then
              term.setCursorPos(1, 18)
              term.clearLine()
              term.setCursorPos(15, 18)
              print (" Username Unavailable")
              sleep(1)
            else
              ioerror = 0
              rep1 = 1
            end
          end
        end

        while rep2 == 0 do
          while rep3 == 0 do
            term.setCursorPos(15, 15)
            write("Password: ")
            sleep(1)
            input = readN(12, "*")
            if input == "" then
              term.setCursorPos(1, 18)
              term.clearLine()
              term.setCursorPos(15, 18)
              print("Invalid Password Entry")
              sleep(1)
              ioerror = ioerror+1
              if ioerror == 3 then
                rep1 = 1
                rep2 = 1
                rep3 = 1
              else
              end
            else
              ioerror = 0
              actpw = input
              rep3 = 1
              rep2 = 1
            end
          end

          term.setCursorPos(13, 16)
          print("|                        |")
          term.setCursorPos(15, 16)
          write("Confirm : ")
          sleep(1)
          input = readN(12, "*")
          actpc = input
          if (actpc) == (actpw) then
            while rep4 == 0 do
              rnd = tostring(math.random(1011, 9999))
              if not fs.exists("pending/".. rnd) then
                file = fs.open("pending/".. rnd, "w")
                file.writeLine(actc)
                file.writeLine(actpw)
                file.close()
                rep4 = rep4+1
              else
              end
            end
            term.setCursorPos(1, 18)
            term.clearLine()
            term.setCursorPos(13, 18)
            print("  Pending... Ref #: ", rnd)
            sleep(1)
            ioerror = 0
            rep2 = 1
            sid = 0
          else
            term.setCursorPos(1, 18)
            term.clearLine()
            term.setCursorPos(15, 18)
            print("Password Doesn't Match")
            sleep(1)
            rep2 = 0
            ioerror = ioerror+1
            if ioerror == 3 then
              rep1 = 1
              rep2 = 1
              rep3 = 1
            else
            end
          end
        end

      elseif sid == 2 then
        term.setCursorPos(13,14)
        print("|########################|")
        term.setCursorPos(13,15)
        print("# SYSTEM SHUTTING DOWN!! #")
        term.setCursorPos(13,16)
        print("|########################|")
        sleep(3)
        os.shutdown()
        end
      end
    end