local datamanager = require "util.datamanager";	

local jid = require "util.jid";

local time = os.time;

local log_ip = module:get_option_boolean("lastlog_ip_address", false);

local host = module.host;

module:hook("authentication-success", function(event)

	local session = event.session;

	if session.username then

		datamanager.store(session.username, host, "lastlog", {

			event = "login";

			timestamp = time(),

			ip = log_ip and session.ip or nil,

		});

	end

end);

module:hook("resource-unbind", function(event)

	local session = event.session;

	if session.username then

		datamanager.store(session.username, host, "lastlog", {

			event = "logout";

			timestamp = time(),

			ip = log_ip and session.ip or nil,

		});

	end

end);

if module:get_option_boolean("lastlog_stamp_offline") then

	local function offline_stamp(event)

		local stanza = event.stanza;

		local node, to_host = jid.split(stanza.attr.from);

		if to_host == host and event.origin == hosts[host] and stanza.attr.type == "unavailable" then

			local data = datamanager.load(node, host, "lastlog");

			local timestamp = data and data.timestamp;

			if timestamp then

				stanza:tag("delay", {

					xmlns = "urn:xmpp:delay",

					from = host,

					stamp = datetime.datetime(timestamp),

				}):up();

			end

		end

	end

	module:hook("pre-presence/bare", offline_stamp);

	module:hook("pre-presence/full", offline_stamp);

end

function module.command(arg)

	if not arg[1] or arg[1] == "--help" then

		require"util.prosodyctl".show_usage([[mod_lastlog <user@host>]], [[Show when user last logged in or out]]);

		return 1;

	end

	local user, host = jid.prepped_split(table.remove(arg, 1));

	require"core.storagemanager".initialize_host(host);

	local lastlog = datamanager.load(user, host, "lastlog");

	if lastlog then

		print(("Last %s: %s"):format(lastlog.event or "login",

		lastlog.timestamp and os.date("%Y-%m-%d %H:%M:%S", lastlog.timestamp) or "<unknown>"));

		if lastlog.ip then

			print("IP address: "..lastlog.ip);

		end

	else

		print("No record found");

		return 1;

	end

	return 0;

end