local st = require "util.stanza";

local jid_prep = require"util.jid".prep;

local motd_messages = module:get_option_array("motd_sequential_messages", {});

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

if #motd_messages == 0 then return; end

if not motd_jid then module:log("error", "Invalid jid: %s", module:get_option_string("motd_jid", module.host)); return; end

local seen = module:open_store("motd_sequential_seen");

module:hook("presence/bare", function (event)

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

	if session.username and not session.presence

	and not stanza.attr.type and not stanza.attr.to then

		local alreadyseen_list = seen:get(session.username) or { max = 0 };

		local alreadyseen = alreadyseen_list.max + 1;

		for i = alreadyseen, #motd_messages do

			if motd_messages[i] then

				session.send(st.message({ to = session.full_jid, from = motd_jid }, motd_messages[i]));

				module:log("debug", "MOTD send to user %s@%s", session.username, session.host);

			end

		end

		alreadyseen_list.max = max;

		seen:set(session.username, alreadyseen_list);

	end