wheat

local t = turtle

print("Enter length:")
local length = tonumber(read())

print("Enter width:")
local width = tonumber(read())

local area = width * length

local fuelLevel = t.getFuelLevel()

print("\nCurrent fuel level: ", fuelLevel)
print("It requires: ", area, " fuel")
if fuelLevel < area then
  print("\nWARNING! Not enough fuel!")
end

print("\nIt requires ~ ", area, " seeds. To continue enter 1..")
local answer = tonumber(read())

if answer ~= 1 then
  return
end

function smartTurn(number)
  if number % 2 == 0 then
    t.turnLeft()
  else
    t.turnRight()
  end
end

function turnToNewIteration(numberForSmartTurn, width)
  if numberForSmartTurn == width then
    return
  end
  smartTurn(numberForSmartTurn)
  t.forward()
  smartTurn(numberForSmartTurn)
end

t.up()
t.forward()

local currentSlot = 1

function checkSlots()
  local itemCount = t.getItemCount(currentSlot)
  if itemCount == 0 then
    if currentSlot == 16 then
      print("Please, add resources, and press 1..")
      local answer = tonumber(read())
      if answer ~= 1 then
        error("No resources")
      else
        currentSlot = 1
        checkSlots()
      end

    else
      currentSlot = currentSlot + 1
      checkSlots()
    end
  else
    t.select(currentSlot)
  end
end

for i = 1, width do
  for j = 1, length do
    t.digDown()
    if t.placeDown() == false then
      checkSlots()
      t.placeDown()
    end

    if j ~= length then
      t.forward()
    end
  end
  turnToNewIteration(i, width)
end

if width % 2 == 0 then
  t.turnRight()
  for i = 1, width - 1 do
    t.forward()
  end
else
  t.turnRight()
  t.turnRight()
  for i = 1, length - 1 do
    t.forward()
  end
  t.turnRight()
  for i = 1, width - 1 do
    t.forward()
  end
end
t.turnRight()
t.back()
t.down()