.menu

os.pullEvent = os.pullEventRaw

local w,h = term.getSize()
--Print Centered
function printCentered(y,s)
  local x = math.floor((w - string.len(s)) /2)
  term.setCursorPos(x,y)
  term.clearLine()
  term.write(s)
end

--Draw Menu Function
local nOption = 1

local function drawMenu()
  term.clear()
  term.setCursorPos(1,1)
  term.write("Notre premier OS")

  term.setCursorPos(w-11,1)
  if nOption == 1 then
    term.write("Commandes")
  elseif nOption == 2 then
    term.write('Programmes')
  elseif nOption == 3 then
    term.write("Enteindre")
  elseif nOption == 4 then
    term.write('Desinstaller')
  else
    end
end

--GUI

term.clear()
local function drawFrontend()
  printCentered(math.floor(h/2) - 3, "")
  printCentered(math.floor(h/2) - 2, "Menu")
  printCentered(math.floor(h/2) - 1, "")
  printCentered(math.floor(h/2) + 0, ((nOption == 1) and "[ Commandes ]") or "Commandes")
  printCentered(math.floor(h/2) + 1, ((nOption == 2) and "[ Programmes ]") or "Programmes")
  printCentered(math.floor(h/2) + 2, ((nOption == 3) and "[ Eteindre ]") or "Eteindre")
  printCentered(math.floor(h/2) + 3, ((nOption == 4) and "[ Desinstaller ]") or "Desinstaller")
end

--Display

drawMenu()
drawFrontend()

while true do
 local e,p = os.pullEvent()
 if e == "key" then
  local key = p
  if key == 17 or key == 200 then

   if nOption > 1 then
    nOption = nOption - 1
    drawMenu()
    drawFrontend()
   end
  elseif key == 31 or key == 208 then
  if nOption < 4 then
  nOption = nOption + 1
  drawMenu()
  drawFrontend()
end
    elseif key == 28 then
break
end
end
end
term.clear()

--Conditions
if nOption == 1 then
term.setCursorPos(1,1)
print("Tapez votre commande")
input = read()
shell.run(input)
print("Programme termine :(")
sleep(3)
shell.run(".menu")
elseif nOption == 2 then
shell.run("programs")
print("Appuyez sur un entrer pour continuer")
input = read()
shell.run(".menu")
elseif nOption == 3 then
os.shutdown()
else
shell.run("os.unistall")
end