-- BaseBuilding Turtle

-- Digs out rooms 16x16x4, with a staircase spiraling along the edges
-- Should always be started at the top-left corner of the area to dig...

-- No idea how I'm gonna get the stars to work, but the main part should be really easy

local startZ = nil
local startX = nil
local startY = nil


turtle.select(1)
turtle.refuel()
turtle.select(2)

while(true) do
	for spacing=1,2 do
		for z=1,4 do
			if startZ then z = startZ startZ = nil end
			for x=1,16 do -- Same, always already in the first one
				if startX then x = startX startX = nil end
				for y=1,16 do -- We're always inside the first one
					if startY then y = startY startY = nil end
					turtle.dig()
					turtle.suck()
					turtle.forward()
					if not turtle.detectDown() and z == 4 then turtle.placeDown() end -- Make sure the floors are filled in
					if not turtle.detectUp() and z == 1 then turtle.placeUp() end -- And the ceilings, which are 1 below the floors
				end
				-- Reached the end on this side, turn (right/left)...
				if x < 16 then
					if x%2 == 1 then turtle.turnRight() else turtle.turnLeft() end
					turtle.dig()
					turtle.forward()
					if x%2 == 1 then turtle.turnRight() else turtle.turnLeft() end
				end
				-- Ready to iterate again
			end
			-- We've cleared out a 16x16 area on this level.
			-- And we are currently in the last block we broke...
			-- So the staircase is to our left.  But, for everything except z==1
			-- We need to do a 180 and go to the opening
			if z > 1 then
				turtle.turnLeft()
				turtle.turnLeft()
				for i=2,z do
					turtle.forward()
				end
				turtle.turnRight()
				turtle.forward() -- There should already be nothing there
				turtle.turnLeft()
			else
				turtle.turnLeft()
				turtle.dig()
				turtle.forward()
				turtle.turnLeft()
			end
			-- Both situations leave us facing to where we need to dig and go down
			turtle.dig()
			turtle.forward()
			turtle.digUp()
			turtle.digDown()
			turtle.down()
				if z < 4 then
				-- Figure out how to get back to our starting point.
				turtle.turnLeft()
				turtle.dig()
				turtle.forward()
				turtle.turnLeft()
				for temp=1,z do -- We will be [z] blocks from the edge on this side
					turtle.dig()
					turtle.forward()
				end
				turtle.turnRight()
				-- And a full 16 blocks from the next edge
				for temp=1,16 do
					turtle.dig()
					turtle.forward()

				end
				turtle.turnRight() -- And it's ready to iterate again
			end
		end
		-- We have successfully dug 16x16x4
		-- And are on our stairwell area, on the 5th block into the stairwell
		-- Continue the stairwell down to 8
		for temp=5,8 do -- This works for both halves
			turtle.dig()
			turtle.forward()
			turtle.digUp()
			turtle.digDown()
			turtle.down()
		end
		-- Get back to the starting position
		turtle.turnLeft()
		turtle.dig()
		turtle.forward()
		turtle.turnLeft()
		-- We are on block 8 and want to be on block 1
		for temp=8,1,-1 do
			turtle.dig()
			turtle.forward()
		end
		turtle.turnRight()
		-- And we're ready to iterate again
	end
end