local st = require "util.stanza";

local default_enable = module:get_option_boolean("muc_offline_delivery_default", false);

module:add_item("muc-registration-field", {

	name = "offline_delivery";

	var = "{http://tigase.org/protocol/muc}offline";

	type = "boolean";

	label = "Receive messages while not connected to the room";

	value = default_enable;

});

module:hook("muc-registration-submitted", function (event)

	local deliver_offline = event.submitted_data.offline_delivery;

	event.affiliation_data.offline_delivery = deliver_offline;

end);

module:hook("muc-add-history", function (event)

	module:log("debug", "Broadcasting message to offline occupants...");

	local sent = 0;

	local room = event.room;

	for jid, affiliation, data in room:each_affiliation() do --luacheck: ignore 213/affiliation

		local reserved_nickname = data and data.reserved_nickname;

		local user_setting = data and data.offline_delivery or nil;

		if reserved_nickname and (user_setting or (user_setting == nil and default_enable)) then

			local is_absent = not room:get_occupant_by_nick(room.jid.."/"..reserved_nickname);

			if is_absent then

				module:log("debug", "Forwarding message to offline member <%s>", jid);

				local msg = st.clone(event.stanza);

				msg.attr.to = jid;

				module:send(msg);

				sent = sent + 1;

			end

		end

	end

	if sent > 0 then

		module:log("debug", "Sent message to %d offline occupants", sent);

	end

end);