feat(auth): integrate codice-fiscale-js for fiscal code validation in registration

app/pages/auth/register.vue

@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import CodiceFiscale from 'codice-fiscale-js'
 import { ref } from 'vue'
 
 definePageMeta({
@@ -25,22 +26,7 @@ const form = ref({
   privacy: false
 })
 
-const computeSurnameCode = (surname = '') => {
-  const s = surname.toUpperCase().replace(/[^A-Z]/g, '')
-  const consonants = s.replace(/[AEIOU]/g, '')
-  const vowels = s.replace(/[^AEIOU]/g, '')
-  return (consonants + vowels + 'XXX').slice(0, 3)
-}
-
-const computeNameCode = (name = '') => {
-  const s = name.toUpperCase().replace(/[^A-Z]/g, '')
-  const consonants = s.replace(/[AEIOU]/g, '')
-  const vowels = s.replace(/[^AEIOU]/g, '')
-  if (consonants.length >= 4) {
-    return consonants.charAt(0) + consonants.charAt(2) + consonants.charAt(3)
-  }
-  return (consonants + vowels + 'XXX').slice(0, 3)
-}
+const normalizeFiscalCode = (fiscalCode = '') => fiscalCode.trim().toUpperCase()
 
 const handleRegister = async () => {
   if (!form.value.privacy) {
@@ -48,13 +34,17 @@ const handleRegister = async () => {
     return
   }
 
-  const expected = computeSurnameCode(form.value.last_name) + computeNameCode(form.value.first_name)
-  if (form.value.fiscal_code.trim().length >= 6) {
-    const provided = form.value.fiscal_code.trim().toUpperCase().slice(0, 6)
-    if (provided !== expected) {
-      errorMessage.value = `Il Codice Fiscale non sembra corrispondere a nome/cognome. Atteso: ${expected}`
-      return
-    }
+  const fiscalCode = normalizeFiscalCode(form.value.fiscal_code)
+  const expected = CodiceFiscale.surnameCode(form.value.last_name) + CodiceFiscale.nameCode(form.value.first_name)
+
+  if (!CodiceFiscale.check(fiscalCode)) {
+    errorMessage.value = 'Il Codice Fiscale inserito non è valido.'
+    return
+  }
+
+  if (fiscalCode.slice(0, 6) !== expected) {
+    errorMessage.value = 'Il Codice Fiscale non corrisponde a nome e cognome inseriti.'
+    return
   }
 
   isLoading.value = true
@@ -64,7 +54,7 @@ const handleRegister = async () => {
     await register({
       first_name: form.value.first_name,
       last_name: form.value.last_name,
-      fiscal_code: form.value.fiscal_code.toUpperCase(),
+      fiscal_code: fiscalCode,
       email: form.value.email,
       password: form.value.password,
       phone: form.value.phone || undefined
@@ -199,4 +189,4 @@ const handleRegister = async () => {
 .pe-5 {
   padding-right: 3rem !important;
 }
-</style>
+</style>