Turtle Lava

--0GLmSd2T
shell.run('clear')
local Fuel = turtle.getFuelLevel()
print("Current Fuel Level " ..Fuel)

local counter=0
local direction = 0
local widthcount=0
local countupheight = 0
local countdownheight=0
local backhome=0

    print("Enter length")
    local length = io.read()
    length = tonumber(length)
    print("Enter width")
    local width = io.read()
    width=tonumber(width)
    print("Enter height")
    local height = io.read()
    height=tonumber(height)

if Fuel>0 then
    turtle.forward()
    while counter<length do
        Fuel = turtle.getFuelLevel()
        print("Fuel is " .. Fuel)
        while countdownheight<height do
            turtle.refuel()
            turtle.placeDown(1)
            turtle.refuel()
            turtle.down()
            countdownheight = countdownheight+1
        end
        countupheight=countdownheight
        while countupheight>0 do
            turtle.up()
            countupheight=countupheight-1
        end
        counter = counter+1
        countupheight=0
        countdownheight=0
        turtle.forward(1)
        if counter==length then
            if widthcount<width then
                if direction==0 then
                    turtle.turnRight()
                    turtle.forward(1)
                    turtle.turnRight()
                    direction=1
                    counter=0
                    widthcount = widthcount+1
                else
                    turtle.turnLeft()
                    turtle.forward()
                    turtle.turnLeft()
                    direction=0
                    counter=0
                    widthcount = widthcount+1
                end
            end
        end
    end
    turtle.forward()
    turtle.turnRight()
    while backhome<width do
        turtle.forward()
        backhome=backhome+1
    end
else
    Fuel = turtle.getFuelLevel()
    if Fuel<500 then
    turtle.refuel()
    end

end