-- 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

local cobbleSlot = 1
local firstFuelSlot = 12
local numFuelSlots = 4


function refuel()
	-- Fix the inventory.  Let's reserve the last 4 slots all for coal
	-- So first, check those 4 slots and if they have noncoal in them, drop them
	-- Then check all other slots, and if they have coal, try to put them in those 4 slots
	-- Also, discard all cobblestone except slot 1, stack it there

	-- There are 16 slots, we want 12-16
	for i=firstFuelSlot,firstFuelSlot+numFuelSlots do
		local data = turtle.getItemDetail(i)
		if data ~= nil then
			print("Found in slot " .. i .. ": ", data.name)
			if data.name ~= "minecraft:coal" then
				turtle.select(i)
				turtle.drop()
				print("Dropping slot " .. i .. " because it's in the coal slot")
			end
		end
	end
	-- Now the rest
	for i=1,firstFuelSlot-1 do
		local data = turtle.getItemDetail(i)
		if data ~= nil then
			print("Found in slot " .. i .. ": ", data.name)
			if data.name == "minecraft:coal" then
				-- Just try them all
				turtle.select(i)
				print("Transferring coal to all fuel slots")
				for j=firstFuelSlot,firstFuelSlot+numFuelSlots do
					turtle.transferTo(j)
				end
			elseif data.name == "minecraft:cobblestone" then
				-- Try to transfer it to cobbleSlot
				turtle.select(i)
				turtle.transferTo(cobbleSlot)
				-- Drop any remainders
				turtle.drop()
			end
		end
	end
	-- And lastly, iterate the fuel slots and refuel
	for i=firstFuelSlot,firstFuelSlot+numFuelSlots do
		turtle.select(i)
		turtle.refuel()
	end
end


turtle.select(firstFuelSlot)
turtle.refuel()
turtle.select(cobbleSlot)

while(true) 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 inclusive, but, we're inclusive on two points
			-- So up to 15
			for temp=1,15 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

	-- This is a good time to ditch items, since we don't pick things up on the stairwell and they won't fall

	refuel()


	-- 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