RedNet strip mining

term.clear()
term.setCursorPos(1,1)
print("Please insert fuel in the first slot and torches in the last.")
rednet.open("right")
senderId, message, distance = rednet.receive()

local traveled = 0
local light = 0
local fueled = 0
local level = turtle.getFuelLevel()
local distance = tonumber(message)

turtle.refuel()

while true do
  if level >= (distance*2) and fueled == 0 then
    fueled = 1
    term.clear()
    term.setCursorPos(1,1)
    print("Sufficient fuel. Beginning operation")
    turtle.select(16)

  elseif level <= (distance*2) and fueled == 0 then
    term.clear()
    term.setCursorPos(1,1)
    repeat
      turtle.refuel()
      level = turtle.getFuelLevel()
      print("Fuel level: "..level )
      print("Insufficient fuel to complete operation!")
      print("Please insert more fuel.")
      term.setCursorPos(1,1)
      sleep(1)
    until level >= (distance*2)
    fueled = 1
    term.clear()
    term.setCursorPos(1,1)
    print("Sufficient fuel. Beginning operation")
    turtle.select(16)
  end

  if (traveled ~= distance) and (fueled == 1) then
    turtle.dig()

    if light == 12 then
      turtle.placeDown()
      light = 0

    else
      light = light + 1
    end

    if turtle.forward() == true then
      turtle.digUp()
      turtle.digDown()
      traveled = traveled + 1
      print("")
      print("Rows dug: "..traveled)
      term.setCursorPos(1,2)

    else
      turtle.dig()
    end

  elseif traveled == distance then
    term.setCursorPos(1,4)
    print("")
    print("Operation complete. Returning.")
    turtle.turnRight()
    turtle.turnRight()

    repeat
      if turtle.forward() == true then
        traveled = traveled - 1

      else
        turtle.dig()
      end

    until traveled == 0
      print("")
      print("Return complete. Terminating program.")
      break
  end
end