Turtle Minecraft Farmer

x = 0
z = 0

a = 8
b = 8

isRunning = true
isLeft = true
isFinishCycle = false

cycle = 0;

function statsTurtle()
    term.setCursorPos(1,12)
    print("Ciclos: ", math.floor(cycle / 2))

    term.setCursorPos(1,13)
    actualFuel = turtle.getFuelLevel()
    totalFuel = turtle.getFuelLimit()
    print("Energia: ",actualFuel,"/",totalFuel)
end

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

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

function transferItemsToChest()
    for i = 2,16 do
        turtle.select(i)
        turtle.dropDown()
    end
    turtle.select(1)
end

function harvestCrop(crop)
    if crop.state.age == 7 then
        turtle.digDown()
        turtle.placeDown()
    end
end

function placeCrop()
    turtle.placeDown()
end

function checkBlockDown()
    isBlock,block = turtle.inspectDown();

    chest = nil
    crop = nil

    if isBlock then
        if type(block) == "table" then
            chest = string.find(block.name,"chest")
            crop = string.find(block.name,"crop")
        end
    else
        placeCrop()
    end

    if chest ~= nil then
        term.clear()
        term.setCursorPos(1,6)
        print("Limpiando inventario...")
        statsTurtle()
        transferItemsToChest()
    else
        if crop ~= nil then
            term.clear()
            term.setCursorPos(1,6)
            print("Crop Actual: ",block.state.age)
            statsTurtle()
            harvestCrop(block)
        end
    end
end

function checkCropHarvested()
    turtle.forward()
    turtle.down()
    turtle.turnLeft()
    turtle.turnLeft()
    while true do
        isBlock,block = turtle.inspect()

        if isBlock then
            sleep(1)
            term.clear()
            term.setCursorPos(1,6)
            print("Nivel del Crop: ", block.state.age)
            statsTurtle()
            if block.state.age == 7 then
                turtle.up()
                turtle.forward()
                break
            end
        else
            turtle.up()
            turtle.forward()
            break
        end
    end
end

while isRunning do

    checkBlockDown()

    if x == a and z == b then
        isFinishCycle = true
    end

    if x == a then
        if isFinishCycle then
            isFinishCycle = false
            isLeft = not isLeft
            z = 0
            checkCropHarvested()
            cycle = cycle + 1;
        else
            if isLeft then
                turnRight()
            else
                turnLeft()
            end
            z = z + 1
        end

        isLeft = not isLeft
        x = 0

    else
        turtle.dig()
        turtle.forward()

        x = x + 1
    end
end