-- Copyright (c) 2019 Kim Alvefur

--

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

-- Yes, this module touches stores data in user sessions

-- luacheck: ignore 122

local grace_period = module:get_option_number("grace_period", 30);

local user_sessions = prosody.hosts[module.host].sessions;

module:hook("csi-is-stanza-important", function (event)

	if event.stanza.name ~= "message" then return end

	local session = event.session;

	if not session then return; end

	local user_session = user_sessions[session.username];

	if not user_session then return; end

	if user_session.grace_time_start then

		if user_session.last_active == session.resource then

			return;

		end

		if (os.time() - user_session.grace_time_start) < grace_period then

			session.log("debug", "Within grace period, probably seen");

			event.reason = "grace period";

			return false;

		end

	end

end, 1);

local function on_activity(event)

	local stanza, origin = event.stanza, event.origin;

	local user_session = user_sessions[origin.username];

	if not user_session then return; end

	if stanza:get_child("body") or stanza:get_child("active", "http://jabber.org/protocol/chatstates") then

		user_session.last_active = origin.resource;

		user_session.grace_time_start = os.time();

	end

end

module:hook("pre-message/full", on_activity);

module:hook("pre-message/bare", on_activity);

module:hook("pre-message/host", on_activity);