r1 = false
r2 = false
r3 = false
lado = "front"

function Refresh(cond, col)
   local curr = rs.getBundledOutput(lado)
   if cond then
      rs.setBundledOutput(lado, colors.combine(curr, col))
   else
      rs.setBundledOutput(lado, colors.subtract(curr, col))
   end
end

function RefreshAll()
   Refresh(r1, colors.white)
   Refresh(r2, colors.orange)
   Refresh(r3, colors.yellow)
end

function Selection()
   print("Please choose the reactors to turn on (1/2/3/all/(r)efresh:")
   local btnB = read()
   if btnB == "r" then
      RefreshAll()
   elseif btnB == "1" then
      print("Reator 1")
      r1 = not r1
      Refresh(colors.white)
   elseif btnB == "2" then
      r2 = not r2
      Refresh(colors.orange)
   elseif btnB == "3" then
      r3 = not r3
      Refresh(colors.yellow)
   elseif btnB == "all" then
      r1 = not r1
      r2 = not r2
      r3 = not r3
      RefreshAll()
   end
end

function Initialize()
   while true do
      term.setBackgroundColor(colors.white)
      term.setTextColor(colors.black)
      term.clear()
      term.setCursorPos(1,1)
      Selection()
      sleep(0.5)
   end
end

Initialize()