-- 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 then

	if restrict_room_creation == true then 

		restrict_room_creation = "admin";

	elseif restrict_room_creation ~= "admin" and restrict_room_creation ~= "local" then

		restrict_room_creation = nil;

	end

end

local muclib = module:require "muc";

local muc_new_room = muclib.new_room;

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 um_is_admin = require "core.usermanager".is_admin;

local hosts = prosody.hosts;

rooms = {};

local rooms = rooms;

-- Configurable options

muclib.set_max_history_length(module:get_option_number("max_history_messages"));

local function is_admin(jid)

	return um_is_admin(jid, module.host);

end

local _set_affiliation = muc_new_room.room_mt.set_affiliation;

local _get_affiliation = muc_new_room.room_mt.get_affiliation;

function muclib.room_mt:get_affiliation(jid)

	if is_admin(jid) then return "owner"; end

	return _get_affiliation(self, jid);

end

function muclib.room_mt:set_affiliation(actor, jid, affiliation, callback, reason)

	if is_admin(jid) then return nil, "modify", "not-acceptable"; end

	return _set_affiliation(self, actor, jid, affiliation, callback, reason);

end

local function room_route_stanza(room, stanza) module:send(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;

		};

		room._data.history = history;

	elseif forced then

		if not next(room._occupants) then -- Room empty

			rooms[room.jid] = nil;

		end

	end

end

function create_room(jid)

	local room = muc_new_room(jid);

	room.route_stanza = room_route_stanza;

	room.save = room_save;

	rooms[jid] = room;

	return room;

end

local persistent_errors = false;

for jid in pairs(persistent_rooms) do

	local node = jid_split(jid);

	if data then

		local room = create_room(jid);

		room._data = data._data;

		room._affiliations = data._affiliations;

	else -- missing room data

		persistent_rooms[jid] = nil;

		module:log("error", "Missing data for room '%s', removing from persistent room list", jid);

		persistent_errors = true;

	end

end

local host_room = muc_new_room(muc_host);

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

			reply:tag("item", {jid=jid, name=room:get_name()}):up();

		end

	end

	return reply; -- TODO cache disco reply

end

local function handle_to_domain(event)

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

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

		if xmlns == "http://jabber.org/protocol/disco#info" and not node then

			origin.send(get_disco_info(stanza));

		elseif xmlns == "http://jabber.org/protocol/disco#items" and not node 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

	return true;

end

function stanza_handler(event)

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

	local bare = jid_bare(stanza.attr.to);

	local room = rooms[bare];

	if not room then

		if stanza.name ~= "presence" then

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

			return true;

		end

		if not(restrict_room_creation) or

		  (restrict_room_creation == "admin" and is_admin(stanza.attr.from)) or

		  (restrict_room_creation == "local" and select(2, jid_split(stanza.attr.from)) == module.host:gsub("^[^%.]+%.", "")) then

			room = create_room(bare);

		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

	return true;

end

module:hook("iq/bare", stanza_handler, -1);

module:hook("message/bare", stanza_handler, -1);

module:hook("presence/bare", stanza_handler, -1);

module:hook("iq/full", stanza_handler, -1);

module:hook("message/full", stanza_handler, -1);

module:hook("presence/full", stanza_handler, -1);

module:hook("iq/host", handle_to_domain, -1);

module:hook("message/host", handle_to_domain, -1);

module:hook("presence/host", handle_to_domain, -1);

hosts[module.host].send = function(stanza) -- FIXME do a generic fix

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

		module:send(stanza);

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

end

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

local saved = false;

module.save = function()

	saved = true;

	return {rooms = rooms};

end

module.restore = function(data)

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

		local room = create_room(jid);

		room._jid_nick = oldroom._jid_nick;

		room._occupants = oldroom._occupants;

		room._data = oldroom._data;

		room._affiliations = oldroom._affiliations;

	end

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

end

function shutdown_room(room, stanza)

	for nick, occupant in pairs(room._occupants) do

		stanza.attr.from = nick;

		for jid in pairs(occupant.sessions) do

			stanza.attr.to = jid;

			room:_route_stanza(stanza);

			room._jid_nick[jid] = nil;

		end

		room._occupants[nick] = nil;

	end

end

function shutdown_component()

	if not saved then

		local stanza = st.presence({type = "unavailable"})

			:tag("x", {xmlns = "http://jabber.org/protocol/muc#user"})

				:tag("item", { affiliation='none', role='none' }):up();

		for roomjid, room in pairs(rooms) do

			shutdown_room(room, stanza);

		end

		shutdown_room(host_room, stanza);

	end

end

module.unload = shutdown_component;

module:hook_global("server-stopping", shutdown_component);