startup

r = peripheral.wrap("back")

while true do

  if r.getActive() == false then
    if r.getFuelAmount() > 189000 and redstone.getInput("left") == false then
      r.setActive(true)
      print("Setting reactor to active.")
    else
      print("Reactor not active, skipping.")
      sleep(10)
    end
  elseif r.getActive() == true then
    print("Reactor is active.")
    insertion = 100 - (math.floor((7000000 - r.getEnergyStored()) / 70000))
    if insertion > 100 then
      insertion = 100
    end
    print("Setting control rod levels to " .. insertion)
    print("There is currently " .. r.getEnergyStored() .. "RF in the reactor buffer")
    r.setAllControlRodLevels(insertion)
    if r.getFuelAmount() < 180000 and redstone.getInput("left") == false then
      r.setActive(false)
      print("Deactivating reactor (fuel levels low)")
    end
    sleep(1.5)
  end
end