Update app.py

app.py

@@ -164,7 +164,7 @@ def retrieve_relevant_chunks(query, top_k=3):
         return [], []
 
 def chat(message, history):
-    """Chat function - processes message and returns response string"""
+    """Chat function - returns response string for ChatInterface"""
     global client
     
     # Reinitialize client if needed
@@ -201,10 +201,11 @@ def chat(message, history):
             {"role": "system", "content": "You are a helpful assistant that answers questions based on provided context. Be concise and accurate."}
         ]
         
-        # Add history - history is already in messages format
+        # Add history - convert from tuples to message format
         if history:
-            for msg in history[-6:]:  # Last 6 messages
-                messages.append(msg)
+            for user_msg, assistant_msg in history[-3:]:  # Last 3 exchanges
+                messages.append({"role": "user", "content": user_msg})
+                messages.append({"role": "assistant", "content": assistant_msg})
         
         # Add current query
         messages.append({
@@ -236,7 +237,6 @@ def chat(message, history):
             'answer': answer
         })
         
-        # Return just the string - ChatInterface handles adding to history
         return full_answer
         
     except Exception as e:
@@ -255,7 +255,7 @@ def download_history():
     except:
         return None
 
-# Build interface - USE gr.ChatInterface!
+# Build interface
 with gr.Blocks(title="Enhanced RAG Chatbot") as demo:
     
     gr.Markdown("""
@@ -280,10 +280,9 @@ with gr.Blocks(title="Enhanced RAG Chatbot") as demo:
             download_file = gr.File(label="Download")
         
         with gr.Column(scale=2):
-            # Use ChatInterface directly - it handles everything!
+            # ChatInterface - REMOVED type="messages" parameter
             chat_interface = gr.ChatInterface(
                 fn=chat,
-                type="messages",
                 chatbot=gr.Chatbot(height=500, label="Conversation"),
                 textbox=gr.Textbox(label="Ask a question", placeholder="Type your question here...", lines=2),
                 submit_btn="Ask",