local t_insert = table.insert;

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

local ipairs = ipairs;

local st = require "util.stanza";

module "discohelper";

local function addDiscoItemsHandler(self, jid, func)

	if self.item_handlers[jid] then

		t_insert(self.item_handlers[jid], func);

	else

		self.item_handlers[jid] = {func};

	end

end

local function addDiscoInfoHandler(self, jid, func)

	if self.info_handlers[jid] then

		t_insert(self.info_handlers[jid], func);

	else

		self.info_handlers[jid] = {func};

	end

end

local function handle(self, stanza)

	if stanza.name == "iq" and stanza.tags[1].name == "query" then

		local query = stanza.tags[1];

		local to = stanza.attr.to;

		local from = stanza.attr.from

		local node = query.attr.node or "";

		local to_node, to_host = jid_split(to);

		local reply = st.reply(stanza):query(query.attr.xmlns);

		local handlers;

		if query.attr.xmlns == "http://jabber.org/protocol/disco#info" then -- select handler set

			handlers = self.info_handlers;

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

			handlers = self.item_handlers;

		end

		local handler = handlers[to]; -- get the handler

		if not handler then -- if not found then use default handler

			if to_node then

				handler = handlers["*defaultnode"];

			else

				handler = handlers["*defaulthost"];

			end

		end

		local found; -- to keep track of any handlers found

		if handler then

			for _, h in ipairs(handler) do

				if h(reply, to, from, node) then found = true; end

			end

		end

		if to_node then -- handlers which get called always

			handler = handlers["*node"];

		else

			handler = handlers["*host"];

		end

		if handler then -- call always called handler

			for _, h in ipairs(handler) do

				if h(reply, to, from, node) then found = true; end

			end

		end

		if found then return reply; end -- return the reply if there was one

		return st.error_reply(stanza, "cancel", "service-unavailable");

	end

end

function new()

	return {

		item_handlers = {};

		info_handlers = {};

		addDiscoItemsHandler = addDiscoItemsHandler;

		addDiscoInfoHandler = addDiscoInfoHandler;

		handle = handle;

	};

end

return _M;