local new_watchdog = require "util.watchdog".new;

local filters = require "util.filters";

local st = require "util.stanza";

local idle_timeout = module:get_option_number("c2s_idle_timeout", 300);

local ping_timeout = module:get_option_number("c2s_ping_timeout",  30);

function update_watchdog(data, session)

	session.idle_watchdog:reset();

	session.idle_pinged = nil;

	return data;

end

function check_session(watchdog)

	local session = watchdog.session;

	if not session.idle_pinged then

		session.idle_pinged = true;

               if session.smacks and not session.awaiting_ack then

                       session.send(st.stanza("r", { xmlns = "urn:xmpp:sm:2" })) -- TODO: hardcoded sm:2

               else

                       session.send(st.iq({ type = "get", from = module.host, id = "idle-check" })

                               :tag("ping", { xmlns = "urn:xmpp:ping" }));

               end

		return ping_timeout; -- Call us again after ping_timeout

	else

		module:log("info", "Client %q silent for too long, closing...", session.full_jid);

		session:close("connection-timeout");

	end

end

function watch_session(session)

	if not session.idle_watchdog

	and not session.requests then -- Don't watch BOSH connections (BOSH already has timeouts)

		session.idle_watchdog = new_watchdog(idle_timeout, check_session);

		session.idle_watchdog.session = session;

		filters.add_filter(session, "bytes/in", update_watchdog);

	end

end

function unwatch_session(session)

	if session.idle_watchdog then

		session.idle_watchdog:cancel();

		session.idle_watchdog = nil;

		filters.remove_filter(session, "bytes/in", update_watchdog);

	end

end

module:hook("resource-bind", function (event) watch_session(event.session); end);

module:hook("resource-unbind", function (event) unwatch_session(event.session); end);