start

os.loadAPI("DZSystem/API/Color")
--os.pullEvent = os.pullEventRaw

local XSize, YSize = term.getSize()
local ID = os.computerID()
local Selector = 1
local Menu = {"First","Second","Third","Exit"}

local function clearScreen(color)
  term.setBackgroundColor(color)
  term.clear()
end

local function fadeIn(time)
  clearScreen(Color.Gray)
  sleep(time)
  clearScreen(Color.LGray)
  sleep(time)
  clearScreen(Color.Blue)
  sleep(time)
  term.setCursorPos(1,1)
end

local function fadeOut(time)
  clearScreen(Color.LGray)
  sleep(time)
  clearScreen(Color.Black)
  sleep(time)
  term.setCursorPos(1,1)
  term.setTextColor(Color.White)
end

local function horisontalBar(x,y,width,color)
  for i=x,(x+width-1) do
    paintutils.drawPixel(i,y,color)
  end
end

local function centerText(how,coord,text,textColor)
  term.setTextColor(textColor)
  if how == "xy" then
    term.setCursorPos(math.floor(XSize/2-#text/2),math.floor(YSize/2))
  elseif how == "x" then
    term.setCursorPos(math.floor(XSize/2-#text/2),coord)
  elseif ohw == "y" then
    term.setCursorPos(coord,math.floor(XSize/2))
  end
  term.write(text)
end

local function gui()
  for i=1,4 do
    if i == Selector then
      term.setTextColor(Color.Red)
      write(">")
    end
  term.setTextColor(Color.White)
  print(Menu[i])
  end
end

fadeIn(0)
term.setTextColor(Color.Yellow)
print("ID: "..ID)
sleep(3)
gui()

while true do
  local scancode = os.pullEvent("key")
  if scancode == 200 then
    Selector = Selector-1
    if Selector<1 then Selector = 1 end
    gui()
  elseif scancode == 208 then
    Selector = Selector+1
    if Selector>4 then Selector=4 end
    gui()
  elseif scancode == 28 and Selector == 4 then
    break
  end
end

fadeOut(0)