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, slice)
    fs.delete("progress.lua")
    repeat
        file = fs.open("progress.lua", "w")
    until file
    file.write("progress = " .. progress .. "\n")
    file.write("layer_start = " .. layer .. "\n")
    file.write("slice_start = " .. slice .. "\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()
	if layer_start == 5 then
		-- avoid breaking the existing floor
		for _ = 0, progress*8 do
			goForward()
		end
	end
	for layer = layer_start, 5 do
		local length = 8 * TILES + 8
		if layer == 5 then
			length = length - 2
		end

		for slice = slice_start, 7 do
			save(layer, slice)
			local y = 12 - layer * 3
			local x = 8
			if layer == 5 then
				x = x - 2
			end
			turnLeft = ((layer + slice) % 2 == 0) ~= mirror
			local z = progress * 8 + 1-- + (layer % 2) * 7

			if layer % 2 == 0 then
				z = z + slice
			else
				z = z + 7 - slice
			end

			local face = mirror and "east" or "west"

			if slice % 2 == 1 then
				x = x - length
				face = rightOf[rightOf[face]]
			end

			if mirror then
				x = -x
			end
			print("going to", x,y,z,face)
			goTo(vector.new(x,y,z), face, true)
			-- print("arrived")
			-- read()

			for _ = 1, length do
				mine3_step()
			end
			if slice == 8 then
				turtle.digUp()
				turtle.digDown()
			else
				turn()
				mine3_step()
				turn()
				-- turnLeft = not turnLeft;
			end
		end
		slice_start = 0
		goLeft()
		goLeft()
	end
	progress = progress + 1
	save(0, 0)
end

function refuel()
	if turtle.getFuelLevel() < 19500 then
		goTo(vector.new(0,0,0), "north")
		while turtle.getFuelLevel() < 20000 do
			turtle.suck()
			turtle.refuel()
		end
		turtle.drop()
		goHome()
	end
end

goHome()
refuel()
clear_tile_slice()
for i = 1, 16 do
	turtle.select(i)
	turtle.drop()
end
turtle.select(1)
goHome()
refuel()