Refactor database handling to require PostgreSQL connection, removing fallback to JSON. Implement error handling for database unavailability in key files. Update .env.example to reflect mandatory DATABASE_URL for local development. Remove Firebase configuration and related code from the project.

partials/footer.php

@@ -61,37 +61,23 @@
 })();
 
 
-// ── Newsletter subscription logic ──────────────────────────
+// ── Newsletter (mailto) ────────────────────────────────────
 function handleSubscribe(e) {
   e.preventDefault();
   var emailInput = document.getElementById('newsletterEmail');
   var feedback = document.getElementById('newsletterFeedback');
   var form = document.getElementById('newsletterForm');
-  var btn = form.querySelector('button');
   var email = emailInput.value.trim();
 
   if (!email) return;
 
-  btn.disabled = true;
-  feedback.className = 'newsletter-feedback';
-  feedback.textContent = '';
+  var subject = encodeURIComponent('FlixCooks Newsletter');
+  var body = encodeURIComponent('Please add me to the newsletter: ' + email);
+  window.location.href = 'mailto:<?php echo e($contactEmail); ?>?subject=' + subject + '&body=' + body;
 
-  window.db.collection('subscribers').doc(email.toLowerCase()).set({
-    email: email.toLowerCase(),
-    subscribedAt: firebase.firestore.FieldValue.serverTimestamp(),
-    status: 'active'
-  })
-  .then(function() {
-    form.classList.add('success');
-    emailInput.disabled = true;
-    feedback.className = 'newsletter-feedback success';
-    feedback.textContent = '<?php echo $langCode === "de" ? "Erfolgreich abonniert!" : "Successfully subscribed!"; ?>';
-  })
-  .catch(function(error) {
-    btn.disabled = false;
-    feedback.className = 'newsletter-feedback error';
-    feedback.textContent = '<?php echo $langCode === "de" ? "Fehler: " : "Error: "; ?>' + error.message;
-  });
+  form.classList.add('success');
+  feedback.className = 'newsletter-feedback success';
+  feedback.textContent = '<?php echo $langCode === "de" ? "E-Mail-Programm geöffnet – bitte absenden." : "Email client opened — please send."; ?>';
 }
 
 // ── Guest Modal Logic ──────────────────────────────────────
@@ -121,33 +107,12 @@ document.addEventListener('click', function(e) {
   }
 });
 
-// ── Favorites Toggle & Management ───────────────────────────
-var currentUser = null;
-var userFavSlugs = new Set();
-
-function syncFavorites(uid) {
-  window.db.collection('user_favorites').where('userId', '==', uid).get()
-    .then(function(snapshot) {
-      userFavSlugs.clear();
-      snapshot.forEach(function(doc) {
-        userFavSlugs.add(doc.data().recipeSlug);
-      });
-      updateHeartStates();
-    })
-    .catch(function(err) {
-      console.error("Error syncing favorites: ", err);
-    });
-}
-
-function clearFavorites() {
-  userFavSlugs.clear();
-  updateHeartStates();
-}
-
+// ── Favorites (localStorage) ───────────────────────────────
 function updateHeartStates() {
+  if (!window.fcLocal) return;
   document.querySelectorAll('.btn-favorite').forEach(function(btn) {
     var slug = btn.getAttribute('data-slug');
-    if (userFavSlugs.has(slug)) {
+    if (slug && window.fcLocal.hasFavorite(slug)) {
       btn.classList.add('active');
     } else {
       btn.classList.remove('active');
@@ -156,43 +121,12 @@ function updateHeartStates() {
 }
 
 function toggleFavorite(slug, btn) {
-  if (!currentUser) {
+  if (!window.fcLocal) {
     openGuestModal();
     return;
   }
-
-  var docId = currentUser.uid + '_' + slug;
-  var docRef = window.db.collection('user_favorites').doc(docId);
-
-  if (userFavSlugs.has(slug)) {
-    // Optimistic UI update
-    userFavSlugs.delete(slug);
-    btn.classList.remove('active');
-    
-    docRef.delete()
-      .catch(function(err) {
-        console.error("Error removing favorite: ", err);
-        // Rollback
-        userFavSlugs.add(slug);
-        btn.classList.add('active');
-      });
-  } else {
-    // Optimistic UI update
-    userFavSlugs.add(slug);
-    btn.classList.add('active');
-
-    docRef.set({
-      userId: currentUser.uid,
-      recipeSlug: slug,
-      createdAt: firebase.firestore.FieldValue.serverTimestamp()
-    })
-    .catch(function(err) {
-      console.error("Error adding favorite: ", err);
-      // Rollback
-      userFavSlugs.delete(slug);
-      btn.classList.remove('active');
-    });
-  }
+  window.fcLocal.toggleFavorite(slug);
+  updateHeartStates();
 }
 
 // Hook up event listeners to all favorite buttons dynamically
@@ -206,18 +140,8 @@ document.addEventListener('click', function(e) {
   }
 });
 
-// Setup Auth state observer for favorites
 window.addEventListener('DOMContentLoaded', function() {
-  if (window.auth) {
-    window.auth.onAuthStateChanged(function(user) {
-      currentUser = user;
-      if (user) {
-        syncFavorites(user.uid);
-      } else {
-        clearFavorites();
-      }
-    });
-  }
+  updateHeartStates();
 });
 })();
 </script>
@@ -228,10 +152,10 @@ window.addEventListener('DOMContentLoaded', function() {
     <button class="guest-modal-close" onclick="closeGuestModal()" aria-label="Close modal">×</button>
     <div class="guest-modal-icon">❤️</div>
     <h3><?php echo $langCode === 'de' ? 'Lieblingsrezept speichern' : 'Save your favorite recipe'; ?></h3>
-    <p><?php echo $langCode === 'de' ? 'Erstelle ein kostenloses Konto oder melde dich an, um Rezepte in deinen Favoriten zu speichern und deine Ernährungsziele zu verwalten.' : 'Create a free account or login to save recipes to your favorites and manage your dietary goals.'; ?></p>
+    <p><?php echo $langCode === 'de' ? 'Speichere Rezepte lokal in deinem Browser und verwalte dein Ernährungsziel im Profil.' : 'Save recipes locally in your browser and manage your dietary goal in your profile.'; ?></p>
     <div class="guest-modal-actions">
       <a class="btn-reveal" href="/login.php<?php echo $langSuffix; ?>">
-        <span class="btn-reveal-text"><?php echo $langCode === 'de' ? 'Jetzt Anmelden' : 'Login / Register'; ?></span>
+        <span class="btn-reveal-text"><?php echo $langCode === 'de' ? 'Zum Profil' : 'Go to profile'; ?></span>
         <span class="btn-reveal-arrow">→</span>
       </a>
       <button class="underline-link" onclick="closeGuestModal()"><?php echo $langCode === 'de' ? 'Später' : 'Maybe later'; ?></button>