require("path")
pp = require("cc.pretty").pretty_print

require("progress")

-- mirror = wall is to the right
local mirror = true
mirror = mirror or false

local TILES = 13

function save(layer)
    fs.delete("progress.lua")
    repeat
        file = fs.open("progress.lua", "w")
    until file
    file.write("progress = " .. progress .. "\n")
    file.write("layer_start = " .. layer .. "\n")
	-- todo save pos separately, more frequently
	file.close()
end

function mine_step()
	repeat
		turtle.dig()
	until goForward()
end

function mine3_step()
	turtle.digUp()
	turtle.digDown()
	repeat
		turtle.dig()
	until goForward()
end

local turnLeft = true
function turn()
	if turnLeft then
		goLeft()
	else
		goRight()
	end
end

-- assumes position is on lamp, right in front of the slice to be mined
-- nearest the wall
function clear_tile_slice()
	for layer = layer_start, 5 do
		save(layer)
		local y = 12 - layer * 3
		local x = 8
		local length = 8 * TILES + 8
		if layer == 5 then
			x = x - 2
			length = length - 2
		end
		turnLeft = (layer % 2 == 0) ~= mirror
		local z = progress*8 + 1 + (layer % 2) * 7
		if y < 0 then
			-- avoid breaking the existing floor
			for _ = 0, progress*8 do
				goForward()
			end
		end
		if mirror then
			goTo(vector.new(-x,y,z), "east", true)
		else
			goTo(vector.new(x,y,z), "west", true)
		end

		for strip = 1, 8 do
			for _ = 1, length do
				mine3_step()
			end
			if strip == 8 then
				turtle.digUp()
				turtle.digDown()
			else
				turn()
				mine3_step()
				turn()
				turnLeft = not turnLeft;
			end
		end
		goLeft()
		goLeft()
	end
end

goHome()
clear_tile_slice()
progress = progress + 1
save(0)
for i = 1, 16 do
	turtle.select(i)
	turtle.drop()
end
turtle.select(1)
goHome()
goLeft()
goLeft()
while turtle.getFuelLevel() < 20000 do
	turtle.suck()
	turtle.refuel()
end
turtle.drop()
goLeft()
goLeft()