local store = module:open_store("lastlog2");

local measure_d1 = module:measure("active_users_1d", "amount");

local measure_d7 = module:measure("active_users_7d", "amount");

local measure_d30 = module:measure("active_users_30d", "amount");

function update_calculations()

	module:log("debug", "Calculating active users");

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

	local active_d1, active_d7, active_d30 = 0, 0, 0;

	local now = os.time();

	for username in store:users() do

		if host_user_sessions[username] then

			-- Active now

			active_d1, active_d7, active_d30 =

				active_d1 + 1, active_d7 + 1, active_d30 + 1;

		else

			local lastlog_data = store:get(username);

			if lastlog_data then

				-- Due to server restarts/crashes/etc. some events

				-- may not always get recorded, so we'll just take the

				-- latest as a sign of last activity

				local last_active = math.max(

					lastlog_data.login and lastlog_data.login.timestamp or 0,

					lastlog_data.logout and lastlog_data.logout.timestamp or 0

				);

				if now - last_active < 86400 then

					active_d1 = active_d1 + 1;

				end

				if now - last_active < 86400*7 then

					active_d7 = active_d7 + 1;

				end

				if now - last_active < 86400*30 then

					active_d30 = active_d30 + 1;

				end

			end

		end

	end

	module:log("debug", "Active users (took %ds): %d (24h), %d (7d), %d (30d)", os.time()-now, active_d1, active_d7, active_d30);

	measure_d1(active_d1);

	measure_d7(active_d7);

	measure_d30(active_d30);

	return 3600 + (300*math.random());

end

module:add_timer(15, update_calculations);