function centerPrint(text,y)
  if y == nil then y = 1 end
  local dx, dy = term.getSize()
  term.setCursorPos(dx/2-#text/2,y)
  print(text)
end

local istyping = true
local input = ""
local printoutput = input
local pchar = "x"
local charlimit = 30
local password = "password"

function setPrintOutput()
  printoutput = input
  if #printoutput > charlimit then
    printoutput = printoutput:sub(#printoutput-charlimit,#printoutput)
  end
  if #input > 1 then
    printoutput = ""
    for i=1 , #input-1 do
      printoutput = printoutput.."x"
    end
    printoutput = printoutput..input:sub(#input,#input)
  end
end

if term.isColor() then
while istyping do
  term.setBackgroundColor(colors.gray)
  term.setTextColor(colors.cyan)
  term.clear()
  term.setCursorPos(1,1)
  centerPrint("Login System",8)
  centerPrint("-=-=-=-=-=-=-=-=-=-=-=-",9)
  setPrintOutput()
  term.setTextColor(colors.white)
  centerPrint(">"..printoutput.."<",11)
  local event, a1 = os.pullEventRaw()
  if event == "char" then
    local keypressed = a1
    input = input..keypressed
  elseif event == "key" then
    local keycode = a1
    if keycode == 14 then
      input = input:sub(1,#input-1)
    elseif keycode == 28 or input == password:sub(1, -2) then
      if input == password:sub(1, -2) then
        term.setTextColor(colors.lime)
        centerPrint("Access Granted!",13)

        redstone.setOutput("back", true)

        sleep(2)

        redstone.setOutput("back", false)

        term.setBackgroundColor(colors.black)
        term.setTextColor(colors.white)
        term.clear()
        term.setCursorPos(1,1)

        sleep(4)

        os.reboot()
      else
        term.setTextColor(colors.orange)
        centerPrint("Access Denied!",13)
        sleep(2)
        input = ""
      end
    end
  end
end
else
while istyping do
  term.setBackgroundColor(colors.white)
  term.setTextColor(colors.black)
  term.clear()
  term.setCursorPos(1,1)
  centerPrint("Login System",8)
  centerPrint("-=-=-=-=-=-=-=-=-=-=-=-",9)
  setPrintOutput()
  centerPrint(">"..printoutput.."<",11)
  local event, a1 = os.pullEventRaw()
  if event == "char" then
    local keypressed = a1
    input = input..keypressed
  elseif event == "key" then
    local keycode = a1
    if keycode == 14 then
      input = input:sub(1,#input-1)
    elseif keycode == 28 or input == password:sub(1, -2) then
      if input == password:sub(1, -2) then
        centerPrint("Access Granted!",13)

        redstone.setOutput("back", true)

        sleep(2)

        redstone.setOutput("back", false)

	    term.setTextColor(colors.white)
	    term.setBackgroundColor(colors.black)
        term.clear()
        term.setCursorPos(1,1)

        sleep(4)

        os.reboot()
      else
        centerPrint("Access Denied!",13)
        sleep(2)
        input = ""
      end
    end
  end
end
end