local st = require "util.stanza";

local send = require "core.sessionmanager".send_to_session;

local usermanager_user_exists = require "core.usermanager".user_exists;

local usermanager_create_user = require "core.usermanager".create_user;

add_iq_handler("c2s", "jabber:iq:register", function (session, stanza)

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

		local query = stanza.tags[1];

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

			local reply = st.reply(stanza);

			reply:tag("query", {xmlns = "jabber:iq:register"})

				:tag("registered"):up()

				:tag("username"):text(session.username):up()

				:tag("password"):up();

			send(session, reply);

		elseif stanza.attr.type == "set" then

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

				-- TODO delete user auth data, send iq response, kick all user resources with a <not-authorized/>, delete all user data

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

			else

				local username = query:child_with_name("username");

				local password = query:child_with_name("password");

				if username and password then

					-- FIXME shouldn't use table.concat

					username = table.concat(username);

					password = table.concat(password);

					if username == session.username then

						if usermanager_create_user(username, password, session.host) then -- password change -- TODO is this the right way?

							send(session, st.reply(stanza));

						else

							-- TODO unable to write file, file may be locked, etc, what's the correct error?

							send(session, st.error_reply(stanza, "wait", "internal-server-error"));

						end

					else

						send(session, st.error_reply(stanza, "modify", "bad-request"));

					end

				else

					send(session, st.error_reply(stanza, "modify", "bad-request"));

				end

			end

		end

	else

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

	end;

end);

add_iq_handler("c2s_unauthed", "jabber:iq:register", function (session, stanza)

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

		local query = stanza.tags[1];

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

			local reply = st.reply(stanza);

			reply:tag("query", {xmlns = "jabber:iq:register"})

				:tag("instructions"):text("Choose a username and password for use with this service."):up()

				:tag("username"):up()

				:tag("password"):up();

			send(session, reply);

		elseif stanza.attr.type == "set" then

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

				send(session, st.error_reply(stanza, "auth", "registration-required"));

			else

				local username = query:child_with_name("username");

				local password = query:child_with_name("password");

				if username and password then

					-- FIXME shouldn't use table.concat

					username = table.concat(username);

					password = table.concat(password);

					if usermanager_user_exists(username, session.host) then

						send(session, st.error_reply(stanza, "cancel", "conflict"));

					else

						if usermanager_create_user(username, password, session.host) then

							send(session, st.reply(stanza)); -- user created!

						else

							-- TODO unable to write file, file may be locked, etc, what's the correct error?

							send(session, st.error_reply(stanza, "wait", "internal-server-error"));

						end

					end

				else

					send(session, st.error_reply(stanza, "modify", "not-acceptable"));

				end

			end

		end

	else

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

	end;

end);