OceanTempleWall[NoFuel]

x = 0

y = 0

z = 0

totalBlocks = 0

facing = "north"

slot = 1

xmem = 0

ymem = 0

zmem = 0

facingmem = "north"

print("Length = ?")

l = tonumber(read())

print("Width = ?")

w = tonumber(read())

print("Height = ?")

h = tonumber(read())

function turn(direction)
    if direction == "north" then
        if facing == "west" then
            turtle.turnRight()
        end
        if facing == "south" then
            turtle.turnRight()
            turtle.turnRight()
        end
        if facing == "east" then
            turtle.turnLeft()
        end
        facing = "north"
    end
    if direction == "west" then
        if facing == "south" then
            turtle.turnRight()
        end
        if facing == "east" then
            turtle.turnRight()
            turtle.turnRight()
        end
        if facing == "north" then
            turtle.turnLeft()
        end
        facing = "west"
    end
    if direction == "south" then
        if facing == "east" then
            turtle.turnRight()
        end
        if facing == "north" then
            turtle.turnRight()
            turtle.turnRight()
        end
        if facing == "west" then
            turtle.turnLeft()
        end
        facing = "south"
    end
    if direction == "east" then
        if facing == "north" then
            turtle.turnRight()
        end
        if facing == "west" then
            turtle.turnRight()
            turtle.turnRight()
        end
        if facing == "south" then
            turtle.turnLeft()
        end
        facing = "east"
    end
end

function returnHome()
    xmem = x
    ymem = y
    zmem = z
    facingmem = facing
    while z < h + 1 do
        if turtle.up() then
            z = z + 1
        end
    end
    turn("west")
    while x > 0 do
        if turtle.forward() then
            x = x - 1
        end
    end
    turn("south")
    while y > -1 do
        if turtle.forward() then
            y = y - 1
        end
    end
    turn("north")
    while z > 0 do
        if turtle.down() then
            z = z - 1
        end
    end
end

function resume()
    while z < h + 1 do
        if turtle.up() then
            z = z + 1
        end
    end
    while y < ymem do
        if turtle.forward() then
            y = y + 1
        end
    end
    turn("east")
    while x < xmem do
        if turtle.forward() then
            x = x + 1
        end
    end
    turn(facingmem)
    while z > zmem do
        if turtle.down() then
            z = z - 1
        end
    end
end

function refill()
    returnHome()
    for i = 1,16,1 do
        turtle.suckDown()
    end
    resume()
end

function countBlocks()
    totalBlocks = 0
    for i = 1,16,1 do
        totalBlocks = totalBlocks + turtle.getItemCount(i)
    end
end

function checkForRefill()
    countBlocks()
    if totalBlocks < h then
        refill()
    end
end

function selectSlot()
    if turtle.getItemCount(slot) == 0 and slot < 16 then
        slot = slot + 1
    elseif turtle.getItemCount(slot) == 0 and slot == 16 then
        slot = 1
    end
    turtle.select(slot)
end

function pillar()
    checkForRefill()
    while z < h do
        if turtle.up() then
            z = z + 1
        end
        selectSlot()
        turtle.placeDown()
    end
    if x == 0 and y == 0 then
        turn("north")
    end
    if x == 0 and y == l - 1 then
        turn("east")
    end
    if x == w - 1 and y == 0 then
        turn("west")
    end
    if x == w - 1 and y == l - 1 then
        turn("south")
    end
    if turtle.forward() then
        if facing == "north" then
            y = y + 1
        end
        if facing == "west" then
            x = x - 1
        end
        if facing == "south" then
            y = y - 1
        end
        if facing == "east" then
            x = x + 1
        end
    end
    while z > 0 do
        if turtle.down() then
            z = z - 1
        end
    end
end

while true do
    pillar()
end