make default_group as utility and added more things

Signed-off-by: Kenneth Obsequio <k80308392@gmail.com>

controllers/auth.controller.js

@@ -39,6 +39,7 @@ const mdl_Users = require('../models/users/users.mdl');
 const mdl_UserSessions = require('../models/users/user_sessions.mdl');
 const { checkAccountStatus } = require('../services/accountStatus.service');
 const { mdl_UserGroups, mdl_UserGroupMembers } = require('../models/users/user_groups.mdl')
+const { NOGRP_CODE, getDefaultGroupId, enrollDefaultGroup } = require('../utils/defaultGroup.util');
 const { generateTokens, verifyRefreshToken, hashToken, shouldRotateRefreshToken } = require('../utils/token.util');
 const { generateState, generateNonce, generatePKCE, buildAuthUrl, exchangeCode, verifyIdToken } = require('../utils/google_oidc.util');
 const { generateOTP, getOTPExpiry, isOTPExpired } = require('../utils/otp.util');
@@ -135,8 +136,7 @@ exports.register = async (req, res) => {
     }
 
     // ── Resolve enroll target (explicit group or NOGRP fallback) ──────────────
-    const enrollGroup = group
-      ?? await mdl_UserGroups.findOne({ where: { group_code: 'NOGRP', is_active: true } });
+    const enrollGroupId = group?.group_id ?? await getDefaultGroupId();
 
     // ── Create user ───────────────────────────────────────────────────────────
     const hashed = await bcrypt.hash(password, 12);
@@ -160,9 +160,9 @@ exports.register = async (req, res) => {
     }, { transaction });
 
     // ── Enroll into group ─────────────────────────────────────────────────────
-    if (enrollGroup) {
+    if (enrollGroupId) {
       await mdl_UserGroupMembers.create({
-        group_id:  enrollGroup.group_id,
+        group_id:  enrollGroupId,
         user_id:   user.user_id,
         createdBy: null,
       }, { transaction });
@@ -255,7 +255,7 @@ exports.verifyOTP = async (req, res) => {
             updatedAt: now,
           },
         ];
-        if (grp?.group_code === 'NOGRP') {
+        if (grp?.group_code === NOGRP_CODE) {
           notifications.push({
             user_id: user.user_id,
             ...NOTIFICATION_REGISTRY.nogrp_welcome.build(),
@@ -465,14 +465,7 @@ exports.googleCallback = async (req, res) => {
           },
         }, { transaction: t });
 
-        const noGrp = await mdl_UserGroups.findOne({ where: { group_code: 'NOGRP', is_active: true }, transaction: t });
-        if (noGrp) {
-          await mdl_UserGroupMembers.create({
-            group_id:  noGrp.group_id,
-            user_id:   user.user_id,
-            createdBy: null,
-          }, { transaction: t });
-        }
+        await enrollDefaultGroup(user.user_id, { transaction: t });
 
         await t.commit();