arg = {...}

local function turnLeft(num)
    for i = 1, num do
        turtle.turnLeft()
    end
end

function loop()
    if #arg > 2 then
        w = tonumber(arg[1])
        h = tonumber(arg[2])
        l = tonumber(arg[3])

        local x = 0
        local y = 0
        local z = 0
        local steps = 0
        orientation = getOrientation()
        while steps < w * h * l do
            if (orientation ~= 3) then

            end

            if (x < w - 1) then
                turtle.dig()
                turtle.forward()
                x = x + 1
                steps = steps + 1
            else
                if (z < l - 1) then
                    if (z % 2 == 0) then
                        turtle.turnRight()
                    else
                        turtle.turnLeft()
                    end
                    turtle.dig()
                    turtle.forward()
                    steps = steps + 1
                    if (z % 2 == 0) then
                        turtle.turnRight()
                    else
                        turtle.turnLeft()
                    end
                    x = 0
                    z = z + 1
                else
                    if (y < h - 1) then
                        turnLeft(3)
                        turtle.digDown()
                        turtle.down()
                        steps = steps + 1
                        x = 0
                        z = 0
                        y = y + 1
                    else
                        break
                    end
                end
            end
        end
    end
end

function getOrientation()
    loc1 = vector.new(gps.locate(2, false))
    steps = 1
    if (not turtle.forward()) then
        for i = 1, 6 do
            steps = steps + 1
            if (not turtle.forward()) then
                turtle.dig()
            else
                break
            end
        end
    end
    loc2 = vector.new(gps.locate(2, false))
    turnLeft(2)
    turtle.forward(2)
    turnLeft(2)
    heading = loc2 - loc1
    return ((heading.x + math.abs(heading.x) * 2) + (heading.z + math.abs(heading.z) * 3))
end

loop()