farm

local args = { ... }

numArgs = table.getn(args)

crop = {["minecraft:potatoes"]="minecraft:potato", ["minecraft:carrots"]="minecraft:carrot", ["minecraft:wheat"]="minecraft:wheat_seeds"}

function fuel ()
  if turtle.getFuelLevel() == 0 then
    turtle.select(1)
    turtle.refuel(1)
  end
end

function scan ()
  worked, data = turtle.inspectDown()
  if data["metadata"] == 7 then
    return data["name"]
  else
    return false
  end
end

function farm (planted)
  toPlant = crop[planted]
  found = false
  slot = 1
  while not found and slot < 16 do
    check = turtle.getItemDetail(slot)
    if check ~= nil then
      if check["name"] == toPlant then
        turtle.select(slot)
        found = true
      end
    end
    slot = slot + 1
  end
  turtle.digDown()
  if turtle.getItemCount() > 0 then
    turtle.placeDown()
  end
end

function move (x, y)
  y = y or x

  for i = 1, x do
    for j = 1, y do
      planted = scan()
      if planted ~= false then
        farm(planted)
      end
      fuel()
      turtle.forward()
    end
    if scan() then
      farm()
    end
    if (i % 2 == 0) then
      turtle.turnLeft()
      fuel()
      turtle.forward()
      turtle.turnLeft()
    else
      turtle.turnRight()
      fuel()
      turtle.forward()
      turtle.turnRight()
    end
  end
end
--================Main===============--

if numArgs == 1.0 then
  move(tonumber(args[1]))
elseif numArgs == 2.0 then
  move(tonumber(args[1]), tonumber(args[2]))
else
  error("Place at bootom left corner, and use below:")
  error("Usage: farm [int xDim & yDim] [int yDim]")
end