startup

turtle.select(1)
turtle.refuel()
for i=2,16,1 do
  turtle.select(i)
  turtle.refuel()
  turtle.drop()
end

function test()
end

turtle.select(1)
turtle.turnLeft()
while true do
  waitForNoRedstone("left",10)
  moveOrRefuel(true)
  if(peripheral.wrap("right").getEnergyStored==0)
  then
    moveOrRefuel(false)
    repeat
    until(redstone.getInput("left"))
  else
    shiftIt()
    moverOrRefuel(false)
  end
end




























function shiftIt()
print("shifted")
end



function waitForNoRedstone(side,time)
  t=0
  repeat
    sleep(.1)
    if(redstone.getInput(side))
    then
      t = 0
    else
      t = t+.1
    end
  until(t>time)
end


function moveOrRefuel(isForward)
  success = false
  if(isForward)
  then
    success = turtle.forward()
  else
    success = turtle.back()
  end
  if(not success)
  then
    if(turtle.getFuelLevel()==0)
    then
      refuel()
    end
    if(isForward)
    then
      success = turtle.forward()
    else
      success = turtle.back()
    end
    if(not success) then
      if(isForward)
      then
        print("Error while trying to go forward")
      else
        print("Error while trying to go backward")
      end
      exit()
    end
  end
end



function refuel()
  turtle.select(1)
  turtle.place()
  turtle.suckUp("front")
  for i=1,16,1 do
    turtle.select(i)
    turtle.refuel()
    turtle.drop()
  end
  turtle.dig()
  turtle.select(1)
end