local log = require "util.logger".init("presencemanager")

local require = require;

local pairs = pairs;

local st = require "util.stanza";

local jid_split = require "util.jid".split;

local hosts = hosts;

local rostermanager = require "core.rostermanager";

local sessionmanager = require "core.sessionmanager";

module "presencemanager"

function send_presence_of_available_resources(user, host, jid, recipient_session, core_route_stanza)

	local h = hosts[host];

	local count = 0;

	if h and h.type == "local" then

		local u = h.sessions[user];

		if u then

			for k, session in pairs(u.sessions) do

				local pres = session.presence;

				if pres then

					pres.attr.to = jid;

					pres.attr.from = session.full_jid;

					pres.attr.to = nil;

					pres.attr.from = nil;

					count = count + 1;

				end

			end

		end

	end

	return count;

end

function handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza)

	local node, host = jid_split(from_bare);

	local st_from, st_to = stanza.attr.from, stanza.attr.to;

	stanza.attr.from, stanza.attr.to = from_bare, to_bare;

	log("debug", "outbound presence "..stanza.attr.type.." from "..from_bare.." for "..to_bare);

	if stanza.attr.type == "subscribe" then

		-- 1. route stanza

		-- 2. roster push (subscription = none, ask = subscribe)

		if rostermanager.set_contact_pending_out(node, host, to_bare) then

			rostermanager.roster_push(node, host, to_bare);

		end -- else file error

		core_route_stanza(origin, stanza);

	elseif stanza.attr.type == "unsubscribe" then

		-- 1. route stanza

		-- 2. roster push (subscription = none or from)

		if rostermanager.unsubscribe(node, host, to_bare) then

			rostermanager.roster_push(node, host, to_bare); -- FIXME do roster push when roster has in fact not changed?

		end -- else file error

		core_route_stanza(origin, stanza);

	elseif stanza.attr.type == "subscribed" then

		-- 1. route stanza

		-- 2. roster_push ()

		-- 3. send_presence_of_available_resources

		if rostermanager.subscribed(node, host, to_bare) then

			rostermanager.roster_push(node, host, to_bare);

			core_route_stanza(origin, stanza);

			send_presence_of_available_resources(node, host, to_bare, origin, core_route_stanza);

		end

	elseif stanza.attr.type == "unsubscribed" then

		-- 1. route stanza

		-- 2. roster push (subscription = none or to)

		if rostermanager.unsubscribed(node, host, to_bare) then

			rostermanager.roster_push(node, host, to_bare);

			core_route_stanza(origin, stanza);

		end

	end

	stanza.attr.from, stanza.attr.to = st_from, st_to;

end

function handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza)

	local node, host = jid_split(to_bare);

	local st_from, st_to = stanza.attr.from, stanza.attr.to;

	stanza.attr.from, stanza.attr.to = from_bare, to_bare;

	log("debug", "inbound presence "..stanza.attr.type.." from "..from_bare.." for "..to_bare);

	if stanza.attr.type == "probe" then

		if rostermanager.is_contact_subscribed(node, host, from_bare) then

			if 0 == send_presence_of_available_resources(node, host, from_bare, origin, core_route_stanza) then

				-- TODO send last recieved unavailable presence (or we MAY do nothing, which is fine too)

			end

		else

			core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="unsubscribed"}));

		end

	elseif stanza.attr.type == "subscribe" then

		if rostermanager.is_contact_subscribed(node, host, from_bare) then

			core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="subscribed"})); -- already subscribed

		else

			if not rostermanager.is_contact_pending_in(node, host, from_bare) then

				if rostermanager.set_contact_pending_in(node, host, from_bare) then

					sessionmanager.send_to_available_resources(node, host, stanza);

				end -- TODO else return error, unable to save

			end

		end

	elseif stanza.attr.type == "unsubscribe" then

		if rostermanager.process_inbound_unsubscribe(node, host, from_bare) then

			rostermanager.roster_push(node, host, from_bare);

		end

	elseif stanza.attr.type == "subscribed" then

		if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then

			rostermanager.roster_push(node, host, from_bare);

		end

	elseif stanza.attr.type == "unsubscribed" then

		if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then

			rostermanager.roster_push(node, host, from_bare);

		end

	end -- discard any other type

	stanza.attr.from, stanza.attr.to = st_from, st_to;

end

return _M;