Floor

print("Floor v1.00")
write("How many meters to go?: ")
z = read()
z = tonumber(z)

if z ~= nil and z > 0 then
  write("How many blocks wide? (default=2): ")
  x = read()
  x = tonumber(x)

  if x == nil or x < 1 then
    print("Nothing given, using default.")
    x = 2
  end

  slot = 1
  slotMax = 16
  itemsStored = 0
  turtle.select(slot);

  for s = 1,16 do
    itemsStored = itemsStored + turtle.getItemCount(s)
  end

  work = x*z + x + z
  if work > itemsStored then
     stacks = math.floor(x*z / 64) + 1
     if stacks > slotMax then
       print("Please think smaller, more than 16 stacks are not possible.")
     else
       print("Not enough items in slots. Need at least " .. stacks .. " stacks")
     end
     return
  end

  if work > turtle.getFuelLevel() then
    print("Too less fuel. Please refuel.")
    return
  end

  print("Building floor " .. z .. "x" .. x)
  turtle.forward()
  turtle.up()
  goRight = true
  goForward = true

 for lx = 1, x do
    for lz = 1, z do
      while not turtle.placeDown() do
        slot = slot + 1
        turtle.select(slot)
      end
      if lz < z then
        turtle.forward()
      end
    end
    if lx < x then
      if goRight then
        turtle.turnRight()
      else
        turtle.turnLeft()
      end
      turtle.forward()
      if goRight then
        turtle.turnRight()
      else
        turtle.turnLeft()
      end
      goRight = not goRight
      goForward = not goForward
    end
  end

  -- come home
  if goForward then
    for l=1, z do
      turtle.back()
    end
    turtle.turnLeft()
    for l=2, x do
      turtle.forward()
    end
    turtle.turnRight()
  else
    turtle.turnRight()
    for l=2, x do
      turtle.forward()
    end
    turtle.turnRight()
    turtle.back()
end
  turtle.down()

end

print("Done building floor.")