Update app.py

app.py

@@ -52,6 +52,32 @@ model = SentenceTransformer("all-MiniLM-L6-v2")
 documents = extract_text_from_pdf("meal_plans")
 index = create_index(documents)
 
+def ingest(folder_path="meal_plans", index_file="mealplan.index"):
+    if os.path.exists(index_file) and os.path.exists("docstore.npy"):
+        print("📦 Loading existing FAISS index...")
+        index = faiss.read_index(index_file)
+        documents = np.load("docstore.npy", allow_pickle=True).tolist()
+    else:
+        print("📥 Ingesting PDFs from scratch...")
+        documents = extract_text_from_pdf(folder_path)
+        texts = [doc["text"] for doc in documents]
+        embeddings = model.encode(texts)
+        dim = embeddings[0].shape[0]
+        index = faiss.IndexFlatL2(dim)
+        index.add(np.array(embeddings).astype("float32"))
+
+        faiss.write_index(index, index_file)
+        np.save("docstore.npy", documents)
+        print("✅ Index and documents saved.")
+
+    return documents, index
+
+# Load model
+model = SentenceTransformer("all-MiniLM-L6-v2")
+
+# Ingest PDFs and build/load index
+documents, index = ingest("meal_plans")
+
 # Gradio UI
 with gr.Blocks(title="Meal Plan Chat Assistant") as demo:
     gr.Markdown("## 🍽️ Meal Plan Assistant\nChat with your PDF documents in `meal_plans/` folder.")