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;

	local send_to;

	do

		local _send_to = session.send_to;

		send_to = function (...) _send_to(session, ...); end

	end

	iq_handlers["jabber:iq:auth"] = 

		function (stanza)

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

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

			local resource = stanza.tags[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);

				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;

					session.full_jid = username.."@"..session.host.."/"..session.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 (not stanza.attr.to) or (hosts[stanza.attr.to] and hosts[stanza.attr.to].type == "local") then

				if stanza.name == "iq" then

					if not stanza.tags[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.tags[1].attr and stanza.tags[1].attr.xmlns) or nil;

					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));

						return;

					end

				end

				if not session.username then log("warn", "Attempt to use an unauthed stream!"); return; end

				if stanza.name == "presence" then

					if session.roster then

						local initial_presence = not session.last_presence;

						session.last_presence = stanza;

						-- Broadcast presence and probes

						local broadcast = st.presence({ from = session.full_jid, type = stanza.attr.type });

						--local probe = st.presence { from = broadcast.attr.from, type = "probe" };

						for child in stanza:childtags() do

							broadcast:add_child(child);

						end

						for contact_jid in pairs(session.roster) do

							broadcast.attr.to = contact_jid;

							send_to(contact_jid, broadcast);

							if initial_presence then

								local node, host = jid.split(contact_jid);

								if hosts[host] and hosts[host].type == "local" then

									local contact = hosts[host].sessions[node]

									if contact then

										local pres = st.presence { to = session.full_jid };

										for resource, contact_session in pairs(contact.sessions) do

											if contact_session.last_presence then

												pres.tags = contact_session.last_presence.tags;

												pres.attr.from = contact_session.full_jid;

												send(pres);

											end

										end

									end

									--FIXME: Do we send unavailable if they are offline?

								else

									probe.attr.to = contact;

									send_to(contact, probe);

								end

							end

						end

						-- Probe for our contacts' presence

					end

				end

			elseif session.username then

			--end				

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

				-- Need to route stanza

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

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

			end

		end

end