Add Google Login

public/js/login.js

@@ -13,6 +13,32 @@ async function checkAuth() {
     }
 }
 
+// Google OAuth Sign In
+async function signInWithGoogle() {
+    try {
+        setLoading(true);
+        clearMessage();
+        
+        const { data, error } = await supabase.auth.signInWithOAuth({
+            provider: 'google',
+            options: {
+                redirectTo: `${window.location.origin}/auth/callback`
+            }
+        });
+        
+        if (error) {
+            console.error('Google OAuth error:', error);
+            showMessage('Fehler bei der Google-Anmeldung: ' + error.message, 'error');
+        }
+        // Note: OAuth redirects the page, so we don't need to handle success here
+    } catch (error) {
+        console.error('Google OAuth error:', error);
+        showMessage('Fehler bei der Google-Anmeldung: ' + error.message, 'error');
+    } finally {
+        setLoading(false);
+    }
+}
+
 // Toggle between login and register forms
 function toggleForm() {
     const loginForm = document.getElementById('loginForm');
@@ -65,6 +91,9 @@ function setLoading(show) {
 
 // Event Listeners Setup
 function setupEventListeners() {
+    // Handle Google OAuth
+    document.getElementById('googleSignInBtn').addEventListener('click', signInWithGoogle);
+    
     // Handle login
     document.getElementById('loginFormElement').addEventListener('submit', async (e) => {
         e.preventDefault();