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utils/authSteps.js

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+function isGoogleUser (user) {
+  return user?.auth_provider === 'google' || Boolean(user?.google_id)
+}
+
+function isInstagramUser (user) {
+  return user?.auth_provider === 'instagram' || Boolean(user?.instagram_id)
+}
+
+/** Social logins (Google, Instagram) skip the mobile-password step — they authenticate via the provider instead. */
+function isSocialUser (user) {
+  return isGoogleUser(user) || isInstagramUser(user)
+}
+
+function isBasicRegistrationComplete (user) {
+  const hasPassword = isSocialUser(user) || Boolean(user?.password)
+  return Boolean(
+    user?.user_name &&
+    hasPassword &&
+    user?.first_name &&
+    user?.user_type
+  )
+}
+
+function getRegistrationStep (user) {
+  if (!user?.user_name) return 'user_name'
+  if (!isSocialUser(user) && !user.password) return 'password'
+  if (!user.first_name) return 'first_name'
+  if (!user.user_type) return 'registration_choice'
+  return 'complete'
+}
+
+function isRegistrationIncomplete (user) {
+  return !isBasicRegistrationComplete(user)
+}
+
+function buildAuthResponse (user, token) {
+  const step = getRegistrationStep(user)
+  const incomplete = isRegistrationIncomplete(user)
+
+  return {
+    message: 'ورود با موفقیت',
+    token,
+    step,
+    auth_provider:
+      user.auth_provider ||
+      (user.google_id ? 'google' : user.instagram_id ? 'instagram' : 'mobile'),
+    email: user.email || null,
+    id: user._id != null ? String(user._id) : undefined,
+    page: incomplete ? 'auth-page' : 'home',
+    user_type: incomplete ? null : user.user_type,
+    registrationComplete: !incomplete,
+  }
+}
+
+module.exports = {
+  isGoogleUser,
+  isInstagramUser,
+  isSocialUser,
+  isBasicRegistrationComplete,
+  getRegistrationStep,
+  isRegistrationIncomplete,
+  buildAuthResponse
+}