startup

rednet.open("right")
local id,msg,dist

function checknfuel()
  if (turtle.getFuelLevel()<1000) and (turtle.getItemCount(5)==0) then
    turtle.select(4)
    turtle.place()
    turtle.select(5)
    turtle.suck()
    turtle.refuel(1)
    turtle.select(4)
    turtle.dig()
  elseif (turtle.getFuelLevel()<1000) and (turtle.getItemCount(5)>0) then
    turtle.select(5)
    turtle.refuel(1)
  end
end

while true do
  id,msg,dist=rednet.receive()
  checknfuel()
  if (msg=="deployportal") and (turtle.detectDown()==false) then
    print("deploying portal")
    turtle.down()
    turtle.select(2)
    turtle.placeDown()
    turtle.up()
    turtle.placeDown()
    turtle.back()
    turtle.back()
    turtle.down()
    turtle.select(1)
    turtle.place()
    turtle.up()
    turtle.forward()
    pt=peripheral.wrap("bottom")
    pt.setGun("normal")
    pt.setColor(true)
    pt.setPowered(false)
    rs.setOutput("bottom",true)
    turtle.forward()
  elseif msg=="retrieve" then
    print("removing portal")
    turtle.back()
    turtle.back()
    turtle.down()
    turtle.select(1)
    turtle.dig()
    turtle.suck()
    turtle.forward()
    turtle.select(2)
    turtle.dig()
    turtle.down()
    turtle.dig()
    turtle.up()
    turtle.up()
    turtle.forward()
    turtle.forward()
  end
end