local modname = minetest.get_current_modname()

-- NODE NAMES

local log_alive = modname .. ":log_alive"
local leaves = modname .. ":leaves"
local leaves_growing = modname .. ":leaves_growing"
local leaves_alive = modname .. ":leaves_alive"

-- END OF NODE NAMES

local max_grow_distance = 2

-- TODO: turn this into an increasing ABM.
blockgame.register_abm({
	label = "grow leaves",
	nodenames = {leaves_growing},
	neighbors = {log_alive, leaves_growing, leaves_alive},
	interval = 15,
	chance = 8,
	action = function (pos, node)
		-- TODO: give leaves energy over time, that they spend when creating new leaves.
		local meta = minetest.get_meta(pos)
		local distance = meta:get_int("leaf_distance") or 1
		if distance >= max_grow_distance then return end

		local neighbors = blockgame.get_neighbors(pos)
		for _, target in pairs(neighbors) do
			if blockgame.chance(2) then
				blockgame.attempt_place(target, {name = leaves_growing})
				minetest.get_meta(target):set_int("leaf_distance", distance + 1)
			end
		end
		minetest.set_node(pos, {name = leaves_alive})
	end,
})