3DigRight

local length = tonumber(arg[1])
local width = tonumber(arg[2])
local height = tonumber(arg[3])
local stepCounter = 0

local unwantedItems = {}

unwantedItems["minecraft:cobblestone"] = true
unwantedItems["minecraft:granite"] = true
unwantedItems["minecraft:andesite"] = true

function dropStuff()
    for i = 1, 16 do
        turtle.select(i)
        if turtle.getItemDetail() ~= nil then
            if unwantedItems[turtle.getItemDetail().name] then
                turtle.drop()
            end
        end
    end
    turtle.select(1)
end


function move()
    turtle.dig()
    if turtle.getFuelLevel() <= 10 then
        turtle.refuel(1)
    end
    while turtle.forward() == false do
        turtle.dig()
    end
    stepCounter = stepCounter + 1
    if stepCounter >= 64 then
        dropStuff()
        stepCounter = 0
    end
end

function turnAround()
    turtle.turnLeft()
    turtle.turnLeft()
end

function returnToStart()
    if length % 2 == 0 then
        -- Turtle is on start side
        if height % 2 == 0 then
            -- Turtle is far left
            -- Turtle is facing outwards
            for i = 1, height-1 do
                turtle.up()
            end
            move()
            turnAround()
        else
            -- Turtle is far right
            -- Turtle is facing outwards
            for i = 1, height-1 do
                turtle.up()
            end
            turtle.turnRight()
            for i = 1, length-1 do
                move()
            end
            turtle.turnLeft()
            move()
            turnAround()
        end
    else
        if height % 2 == 0 then
            -- Turtle is on start side and far left
            -- Turtle is facing outwards
            for i = 1, height-1 do
                turtle.up()
            end
            move()
            turnAround()
        else
            -- Turtle is on far side and far right
            -- Turtle is facing outwards
            for i = 1, height-1 do
                turtle.up()
            end
            turnAround()
            for i = 1, width-1 do
                move()
            end
            turtle.turnRight()
            for i = 1, length-1 do
                move()
            end
            turtle.turnLeft()
            move()
            turnAround()
        end
    end

    for i = 1, 16 do
        turtle.select(i)
        if turtle.getItemDetail() ~= nil then
            turtle.dropDown()
        end
    end
    turtle.select(1)
end


move()
for i = 1, height do
    for j = 1, length do
        for k = 1, width-1 do
            move()
        end
        if j == length then
            break;
        end
        if length % 2 == 0 then
            if i % 2 == 1 then
                if j % 2 == 1 then
                    turtle.turnRight()
                    move()
                    turtle.turnRight()
                else
                    turtle.turnLeft()
                    move()
                    turtle.turnLeft()
                end
            else
                if j % 2 == 1 then
                    turtle.turnLeft()
                    move()
                    turtle.turnLeft()
                else
                    turtle.turnRight()
                    move()
                    turtle.turnRight()
                end
            end
        else
            if j % 2 == 1 then
                turtle.turnRight()
                move()
                turtle.turnRight()
            else
                turtle.turnLeft()
                move()
                turtle.turnLeft()
            end
        end
    end
    if i == height then
        break;
    end
    turtle.digDown()
    turtle.down()
    turnAround()
end

returnToStart()