require "util.stanza"

local st = stanza;

local t_concat = table.concat;

local format = string.format;

function init_stanza_dispatcher(session)

	local iq_handlers = {};

	local session_log = session.log;

	local log = function (type, msg) session_log(type, "stanza_dispatcher", msg); end

	local send = session.send;

	iq_handlers["jabber:iq:auth"] = 

		function (stanza)

			local username = stanza[1]:child_with_name("username");

			local password = stanza[1]:child_with_name("password");

			local resource = stanza[1]:child_with_name("resource");

			if not (username and password and resource) then

				local reply = st.reply(stanza);

				send(reply:query("jabber:iq:auth")

					:tag("username"):up()

					:tag("password"):up()

					:tag("resource"):up());

				return true;			

			else

				username, password, resource = t_concat(username), t_concat(password), t_concat(resource);

				print(username, password, resource)

				local reply = st.reply(stanza);

				require "core.usermanager"

				if usermanager.validate_credentials(session.host, username, password) then

					-- Authentication successful!

					session.username = username;

					session.resource = resource;

					if not hosts[session.host].sessions[username] then

						hosts[session.host].sessions[username] = { sessions = {} };

					end

					hosts[session.host].sessions[username].sessions[resource] = session;

					send(st.reply(stanza));

					return true;

				else

					local reply = st.reply(stanza);

					reply.attr.type = "error";

					reply:tag("error", { code = "401", type = "auth" })

						:tag("not-authorized", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas" });

					send(reply);

					return true;

				end

			end

		end

	iq_handlers["jabber:iq:roster"] =

		function (stanza)

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

				session.roster = session.roster or rostermanager.getroster(session.username, session.host);

				if session.roster == false then

					send(st.reply(stanza)

						:tag("error", { type = "wait" })

						:tag("internal-server-error", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}));

					return true;

				else session.roster = session.roster or {};

				end

				local roster = st.reply(stanza)

							:query("jabber:iq:roster");

				for jid in pairs(session.roster) do

					roster:tag("item", { jid = jid, subscription = "none" }):up();

				end

				send(roster);

				return true;

			end

		end

	return	function (stanza)

			log("info", "--> "..tostring(stanza));

			if stanza.name == "iq" then

				if not stanza[1] then log("warn", "<iq> without child is invalid"); return; end

				if not stanza.attr.id then log("warn", "<iq> without id attribute is invalid"); end

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

				if not xmlns then log("warn", "Child of <iq> has no xmlns - invalid"); return; end

				if (((not stanza.attr.to) or stanza.attr.to == session.host or stanza.attr.to:match("@[^/]+$")) and (stanza.attr.type == "get" or stanza.attr.type == "set")) then -- Stanza sent to us

					if iq_handlers[xmlns] then

						if iq_handlers[xmlns](stanza) then return; end;

					end

					log("warn", "Unhandled namespace: "..xmlns);

					send(format("<iq type='error' id='%s'><error type='cancel'><service-unavailable/></error></iq>", stanza.attr.id));

				end

			end

							-- Need to route stanza

			if stanza.attr.to and ((not hosts[stanza.attr.to]) or hosts[stanza.attr.to].type ~= "local") then

				stanza.attr.from = session.username.."@"..session.host;

				session.send_to(stanza.attr.to, stanza);

			end

		end

end