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

                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("|------------------------|")

                        while rep5 == 0 do
                          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
                                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(3)
                                  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: ")
                                        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(2)
                                                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(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: ")
                          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: ")
                                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 : ")
                          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