local set = require "util.set";

local secret = module:get_option_string("turn_external_secret");

local host = module:get_option_string("turn_external_host", module.host);

local user = module:get_option_string("turn_external_user");

local port = module:get_option_number("turn_external_port", 3478);

local ttl = module:get_option_number("turn_external_ttl", 86400);

local tcp = module:get_option_boolean("turn_external_tcp", false);

local tls_port = module:get_option_number("turn_external_tls_port");

if not secret then error("mod_" .. module.name .. " requires that 'turn_external_secret' be set") end

local services = set.new({ "stun-udp"; "turn-udp" });

if tcp then

	services:add("stun-tcp");

	services:add("turn-tcp");

end

if tls_port then

	services:add("turns-tcp");

end

module:depends "external_services";

for _, type in ipairs({ "stun"; "turn"; "turns" }) do

	for _, transport in ipairs({"udp"; "tcp"}) do

		if services:contains(type .. "-" .. transport) then

			module:add_item("external_service", {

				type = type;

				transport = transport;

				host = host;

				port = type == "turns" and tls_port or port;

				username = type == "turn" and user or nil;

				secret = type == "turn" and secret or nil;

				ttl = type == "turn" and ttl or nil;

			})

		end

	end

end