added firestore config

src/contexts/AuthContext.tsx

@@ -13,7 +13,9 @@ import {
   signOut as firebaseSignOut,
   type User,
 } from 'firebase/auth'
-import { auth, googleProvider } from '../lib/firebase'
+import { auth, googleProvider, db } from '../lib/firebase'
+import { doc, setDoc } from 'firebase/firestore'
+import { COLLECTIONS } from '../lib/firestoreConfig'
 
 type AuthContextValue = {
   user: User | null
@@ -28,9 +30,28 @@ export function AuthProvider({ children }: { children: ReactNode }) {
   const [user, setUser] = useState<User | null>(null)
   const [loading, setLoading] = useState(true)
 
+  // Save user info to Firestore when they authenticate
+  async function saveUserToFirestore(authUser: User) {
+    try {
+      const userRef = doc(db, COLLECTIONS.USERS, authUser.uid)
+      await setDoc(userRef, {
+        id: authUser.uid,
+        email: authUser.email || '',
+        displayName: authUser.displayName || '',
+        photoURL: authUser.photoURL || '',
+        lastLoginAt: Date.now(),
+      }, { merge: true })
+    } catch (error) {
+      console.error('Error saving user to Firestore:', error)
+    }
+  }
+
   useEffect(() => {
-    const unsubscribe = onAuthStateChanged(auth, (u) => {
+    const unsubscribe = onAuthStateChanged(auth, async (u) => {
       setUser(u)
+      if (u) {
+        await saveUserToFirestore(u)
+      }
       setLoading(false)
     })
     return () => unsubscribe()