-- [FUEL, ECHEST, BLOCKS]

function getBlocks()
	turtle.select(2)
	local items = turtle.getItemCount()
	if items < 32 then
		turtle.select(2)
		turtle.placeUp()
		turtle.select(3)
		turtle.suckUp(64 - items)
		turtle.select(2)
		turtle.digUp()
	end
end

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

local fails = 0

while true do
	getBlocks()
	refuel()
	while turtle.back() do
		refuel()
		turtle.select(3)
		turtle.place()
		fails = 0
	end
	turtle.turnLeft()
	fails = fails + 1
	if fails == 4 then
		break
	end
end