Update app.py

app.py

@@ -16,13 +16,17 @@ Use clear sections, shots, and visual descriptions when possible.
 # Chat Function
 # -------------------------
 def respond(message, history, model, temperature, max_tokens):
+    if not message or message.strip() == "":
+        return history
+
+    # Start conversation with system prompt
     messages = [{"role": "system", "content": SYSTEM_PROMPT}]
 
-    for h in history:
-        messages.append({"role": "user", "content": h[0]})
-        if h[1]:
-            messages.append({"role": "assistant", "content": h[1]})
+    # Add previous chat history (already dict-based)
+    for msg in history:
+        messages.append(msg)
 
+    # Add new user message
     messages.append({"role": "user", "content": message})
 
     try:
@@ -32,10 +36,18 @@ def respond(message, history, model, temperature, max_tokens):
             temperature=temperature,
             max_completion_tokens=max_tokens,
         )
-        return response.choices[0].message.content
+
+        assistant_reply = response.choices[0].message.content
+
+        # Update history in NEW format
+        history.append({"role": "user", "content": message})
+        history.append({"role": "assistant", "content": assistant_reply})
+
+        return history
 
     except Exception as e:
-        return f"❌ Error: {str(e)}"
+        history.append({"role": "assistant", "content": f"❌ Error: {str(e)}"})
+        return history
 
 # -------------------------
 # Custom CSS