depthFill

local tArgs = { ... }

local xWidth = tonumber(tArgs[1])
local zWidth = tonumber(tArgs[2]) or 1
local useEnder = tArgs[3] or false

local xPos = 1
local zPos = 1
local xDir, zDir = 1, 0
local curSlot = 1

local function selectResource()
    while turtle.getItemCount(curSlot) == 0 and curSlot < 16 do
        curSlot = curSlot + 1
    end
    turtle.select(curSlot)
    if curSlot == 16 then
        if not useEnder then
            return false
        end
        turtle.placeUp()
        for i = 1, 15, 1 do
            turtle.select(i)
            turtle.suckUp()
        end
        turtle.select(curSlot)
        turtle.digUp()
        curSlot = 1
        turtle.select(curSlot)
    end
    return true
end

local function placeDown()
    local result = selectResource()
    if not result then
        return false
    end
    return turtle.placeDown()
end

local function fillUnit()
    local y = 0
    while not turtle.detectDown() do
        local down = false
        while not down do
            down = turtle.down()
        end
        y = y - 1
    end

    local result = true
    while y < 0 and result do
        local up = false
        while not up do
            up = turtle.up()
        end
        result = placeDown()
        y = y + 1
    end

    if y == 0 then
        return true
    end

    while y < 0 do
        local up = false;
        while not up do
            up = turtle.up()
        end
        y = y + 1
    end

    return false
end

local function turnRight(times)
    times = times or 1
    for i = 1, times, 1 do
        if xDir == 1 then
            xDir = 0
            zDir = 1
        elseif xDir == -1 then
            xDir = 0
            zDir = -1
        elseif zDir == 1 then
            xDir = -1
            zDir = 0
        else
            xDir = 1
            zDir = 0
        end
        turtle.turnRight()
    end
end

local function turnLeft(times)
    times = times or 1
    for i = 1, times, 1 do
        if xDir == 1 then
            xDir = 0
            zDir = -1
        elseif xDir == -1 then
            xDir = 0
            zDir = 1
        elseif zDir == 1 then
            xDir = 1
            zDir = 0
        else
            xDir = -1
            zDir = 0
        end
        turtle.turnLeft()
    end
end

local function forward(times)
    times = times or 1
    local result = false
    for i = 1, times, 1 do
        while not result do
            turtle.dig()
            result = turtle.forward()
        end

        if result then
            xPos = xPos + xDir
            zPos = zPos + zDir
        else
            return false
        end
    end
    return true
end

local result = fillUnit()
local done = false
local doneRow = false

while not done and result do
    if doneRow then
        if xDir == 1 then
            turnRight()
            result = forward()
            result = result and fillUnit()
            turnRight()
        else
            turnLeft()
            result = forward()
            result = result and fillUnit()
            turnLeft()
        end
        doneRow = false
    else
        result = forward()
        result = result and fillUnit()
        if xPos == 1 or xPos == xWidth then
            doneRow = true
        end
        if doneRow and zPos == zWidth then
            done =  true
        end
    end
end

if xDir == 1 then
    turnLeft()
else
    turnRight()
end

while zPos > 1 do
    forward()
end

turnLeft()

while xPos > 1 do
    forward()
end