function refuel()
   if turtle.getFuelLevel() < 10 then
      turtle.select(1)
      turtle.refuel(1)
      print("refueling")
   end
end

function plant()
   turtle.select(2)
   turtle.placeDown()
end

function harvest()
   turtle.digDown()
end

function prepare()
   turtle.attackDown()
end

function turnLeft()
   turtle.turnLeft()
   turtle.forward()
   turtle.turnLeft()
end

function turnRight()
   turtle.turnRight()
   turtle.forward()
   turtle.turnRight()
end

function goHome()
   turtle.turnRight()
   for i=1,27 do
      refuel()
      turtle.forward()
   end
   for i=1,10 do
      refuel()
      turtle.down()
   end
   turtle.turnRight()
   turtle.turnRight()
end

function doWork()
   for i=1,7 do
      refuel()
      harvest()
      prepare()
      plant()
      turtle.forward()
   end
   harvest()
   prepare()
   plant()
end

function work()
   turtle.turnRight()
   for j=1,3 do
      for i=1,4 do
         doWork()
         turnLeft()
         doWork()
         turnRight()
      end
      turtle.up()
      turtle.turnLeft()
      turtle.forward()
      turtle.turnRight()
   end
   goHome()
end

function main()
   print("Starting")
   refuel()
   turtle.up()
   turtle.up()
   turtle.forward()
   turtle.forward()
   work()
   print("end")
end


main()