Update app.py

app.py

@@ -23,22 +23,19 @@ def format_chunks(chunks):
 
 # ---------- Chat handler (tuple-based, HF compatible) ----------
 def chat_handler(message, chat_history):
-    """
-    message: str
-    chat_history: List[Tuple[user, assistant]]
-    """
     chat_history = chat_history or []
 
-    # Build history string for RAG backend
+    # Build history text for RAG backend
     history_text = ""
-    for user_msg, bot_msg in chat_history:
-        history_text += f"User: {user_msg}\nAssistant: {bot_msg}\n"
+    for msg in chat_history:
+        history_text += f"{msg['role'].capitalize()}: {msg['content']}\n"
 
     # Call RAG backend
     answer, chunks = answer_question(message, history_text)
 
-    # Append new turn (TUPLE FORMAT)
-    chat_history.append((message, answer))
+    # Append messages as DICTS (REQUIRED)
+    chat_history.append({"role": "user", "content": message})
+    chat_history.append({"role": "assistant", "content": answer})
 
     chunk_display = format_chunks(chunks)