local args = {...}
local length = tonumber(args[1])
local depth = tonumber(args[2])
local height = tonumber(args[3])
length = length or 3
height = height or 3
depth = depth or 3
local need = length * height * depth
local x = length
local y = height - 1
local z = depth
local check = 1
local bottom = 1
local top = 0
local left = 1
local right = 0
local l = 1
local r = 0
local q = x

function fuel(amount)
	if turtle.getFuelLevel() < 5 then
		turtle.select(16)
		turtle.refuel(amount)
		turtle.select(1)
	end
end

function chest()
	if turtle.getItemCount(14) >= 1 then
		turtle.turnRight(2)
		while turtle.detect() do
			turtle.dig()
			sleep(0.5)
		end
		turtle.select(15)
		turtle.place()
		for m=1,14 do
			turtle.select(m)
			turtle.drop()
		end
		turtle.select(1)
		turtle.turnLeft(2)
	end
end

function move()
	if right == 0 and left == 0 then
		while turtle.detect() do
			turtle.dig()
			sleep(0.75)
		end
		turtle.forward()
	end
	if right == 1 then
		turtle.turnLeft()
		while turtle.detect() do
			turtle.dig()
			sleep(0.5)
		end
		turtle.forward()
		turtle.turnLeft()
		right = 0
	end
	if left == 1 then
		turtle.turnRight()
		while turtle.detect() do
			turtle.dig()
			sleep(0.5)
		end
		turtle.forward()
		turtle.turnRight()
		left = 0
	end
end

function up()
	if bottom == 1 then
		move()
		for a = 1, y do
			while turtle.detectUp() do
				turtle.digUp()
				sleep(0.5)
			end
			turtle.up()
			fuel(1)
			chest()
		end
	end
end

function down()
	if top == 1 then
		move()
		for b = 1, y do
			while turtle.detectDown() do
				turtle.digDown()
				sleep(0.25)
			end
			turtle.down()
			fuel(1)
			chest()
		end
	end
end

function value()
	if bottom == 1 then
		bottom = 0
		top = 1
	else
		bottom = 1
		top = 0
	end
end

function switch()
	if l == 1 then
		left = 0
		right = 1
		l = 0
		r = 1
	else
		left = 1
		right = 0
		l = 1
		r = 1
	end
end

function back()
	if top == 1 then
		for c = 1, y do
			while turtle.detectDown() do
				turtle.digDown()
				sleep(0.25)
			end
			turtle.down()
		end
	end
end


if turtle.getFuelLevel() < need and turtle.getItemCount(16) == 0 then
	print("Please add fuel in slot 16")
	check = 0
end

if need > 500 and turtle.getItemCount(15) == 0 then
	print("Please put chests in slot 15")
	check = 0
end


if check == 1 then
	print("Digging away")
	turtle.turnLeft()
	for j = 1, z do
		for i = 1, x do
			up()
			down()
			if (i % 5) == 0 and (j % 5) == 0 then
			end
			value()
			if i == q then
				switch()
			end
		end
	end
	back()
end