-- Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

-- 

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

if module:get_host_type() ~= "component" then

	error("MUC should be loaded as a component, please see http://prosody.im/doc/components", 0);

end

local muc_host = module:get_host();

local muc_name = module:get_option("name");

if type(muc_name) ~= "string" then muc_name = "Prosody Chatrooms"; end

local restrict_room_creation = module:get_option("restrict_room_creation");

if restrict_room_creation and restrict_room_creation ~= true then restrict_room_creation = nil; end

local muc_new_room = module:require "muc".new_room;

local register_component = require "core.componentmanager".register_component;

local deregister_component = require "core.componentmanager".deregister_component;

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

local jid_bare = require "util.jid".bare;

local st = require "util.stanza";

local uuid_gen = require "util.uuid".generate;

local datamanager = require "util.datamanager";

local um_is_admin = require "core.usermanager".is_admin;

local rooms = {};

local persistent_rooms = datamanager.load(nil, muc_host, "persistent") or {};

local component;

-- Configurable options

local max_history_messages = module:get_option_number("max_history_messages");

local function is_admin(jid)

	return um_is_admin(jid, module.host);

end

local function room_route_stanza(room, stanza) core_post_stanza(component, stanza); end

local function room_save(room, forced)

	local node = jid_split(room.jid);

	persistent_rooms[room.jid] = room._data.persistent;

	if room._data.persistent then

		local history = room._data.history;

		room._data.history = nil;

		local data = {

			jid = room.jid;

			_data = room._data;

			_affiliations = room._affiliations;

		};

		datamanager.store(node, muc_host, "config", data);

		room._data.history = history;

	elseif forced then

		datamanager.store(node, muc_host, "config", nil);

	end

	if forced then datamanager.store(nil, muc_host, "persistent", persistent_rooms); end

end

for jid in pairs(persistent_rooms) do

	local node = jid_split(jid);

	local data = datamanager.load(node, muc_host, "config") or {};

	local room = muc_new_room(jid, {

		history_length = max_history_messages;

	});

	room._data = data._data;

	room._data.history_length = max_history_messages; --TODO: Need to allow per-room with a global limit

	room._affiliations = data._affiliations;

	room.route_stanza = room_route_stanza;

	room.save = room_save;

	rooms[jid] = room;

end

local host_room = muc_new_room(muc_host, {

	history_length = max_history_messages;

});

host_room.route_stanza = room_route_stanza;

host_room.save = room_save;

local function get_disco_info(stanza)

	return st.iq({type='result', id=stanza.attr.id, from=muc_host, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#info")

		:tag("identity", {category='conference', type='text', name=muc_name}):up()

		:tag("feature", {var="http://jabber.org/protocol/muc"}); -- TODO cache disco reply

end

local function get_disco_items(stanza)

	local reply = st.iq({type='result', id=stanza.attr.id, from=muc_host, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#items");

	for jid, room in pairs(rooms) do

		if not room:is_hidden() then

		end

	end

	return reply; -- TODO cache disco reply

end

local function handle_to_domain(origin, stanza)

	local type = stanza.attr.type;

	if type == "error" or type == "result" then return; end

	if stanza.name == "iq" and type == "get" then

		local xmlns = stanza.tags[1].attr.xmlns;

		if xmlns == "http://jabber.org/protocol/disco#info" then

			origin.send(get_disco_info(stanza));

		elseif xmlns == "http://jabber.org/protocol/disco#items" then

			origin.send(get_disco_items(stanza));

		elseif xmlns == "http://jabber.org/protocol/muc#unique" then

			origin.send(st.reply(stanza):tag("unique", {xmlns = xmlns}):text(uuid_gen())); -- FIXME Random UUIDs can theoretically have collisions

		else

			origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- TODO disco/etc

		end

	else

		host_room:handle_stanza(origin, stanza);

		--origin.send(st.error_reply(stanza, "cancel", "service-unavailable", "The muc server doesn't deal with messages and presence directed at it"));

	end

end

component = register_component(muc_host, function(origin, stanza)

	local to_node, to_host, to_resource = jid_split(stanza.attr.to);

	if to_node then

		local bare = to_node.."@"..to_host;

		if to_host == muc_host or bare == muc_host then

			local room = rooms[bare];

			if not room then

				if not(restrict_room_creation) or is_admin(stanza.attr.from) then

					room = muc_new_room(bare, {

						history_length = max_history_messages;

					});

					room.route_stanza = room_route_stanza;

					room.save = room_save;

					rooms[bare] = room;

				end

			end

			if room then

				room:handle_stanza(origin, stanza);

				if not next(room._occupants) and not persistent_rooms[room.jid] then -- empty, non-persistent room

					rooms[bare] = nil; -- discard room

				end

			else

				origin.send(st.error_reply(stanza, "cancel", "not-allowed"));

			end

		else --[[not for us?]] end

		return;

	end

	-- to the main muc domain

	handle_to_domain(origin, stanza);

end);

function component.send(stanza) -- FIXME do a generic fix

	if stanza.attr.type == "result" or stanza.attr.type == "error" then

		core_post_stanza(component, stanza);

	else error("component.send only supports result and error stanzas at the moment"); end

end

prosody.hosts[module:get_host()].muc = { rooms = rooms };

module.unload = function()

	deregister_component(muc_host);

end

module.save = function()

	return {rooms = rooms};

end

module.restore = function(data)

	rooms = {};

	for jid, oldroom in pairs(data.rooms or {}) do

		local room = muc_new_room(jid);

		room._jid_nick = oldroom._jid_nick;

		room._occupants = oldroom._occupants;

		room._data = oldroom._data;

		room._affiliations = oldroom._affiliations;

		room.route_stanza = room_route_stanza;

		room.save = room_save;

		rooms[jid] = room;

	end

	prosody.hosts[module:get_host()].muc = { rooms = rooms };

end