local S = minetest.get_translator("elevator")

local mod_data_path = minetest.get_worldpath() .. "/mod_elevator.data"

-- called whenever a station is added or removed
function elevator.save_data()
	local data = minetest.serialize(elevator.targets)

	local success = minetest.safe_file_write(mod_data_path, data)
	if not success then
		print(S("[Mod elevator] Error: Savefile '@1' could not be written.", mod_data_path))
	end
end


function elevator.restore_data()
	local file = io.open(mod_data_path, "r")
	if not file then
		print(S("[Mod elevator] Error: Savefile '@1' not found.", mod_data_path))
		return
	end

	local data = file:read("*all")
	elevator.targets = minetest.deserialize(data)

	if not elevator.targets then
		local backup_file = mod_data_path .. ".bak"
		print(S("[Mod elevator] Error: Savefile '@1' is damaged." .. " " ..
				"Saved the backup as '@2'.", mod_data_path, backup_file))

		minetest.safe_file_write(backup_file, data)
		elevator.targets = {}
	end
	file:close()
end