Refactor chat API interaction to improve error handling and update conversation history

app.py

@@ -50,19 +50,32 @@ if not wait_for_fastapi():
     sys.exit(1)
 
 # Create a Gradio interface that will proxy requests to FastAPI
-def chat_with_api(message, conversation_id=None):
+def respond(message, history, conversation_id=None):
+    """Handle chat messages and update conversation history"""
+    if not message:
+        return history, conversation_id
+    
     try:
+        # Send request to FastAPI backend
         response = requests.post(
             "http://127.0.0.1:8000/chat",
             json={"message": message, "conversation_id": conversation_id}
         )
+        
         if response.status_code == 200:
             data = response.json()
-            return data["response"], data["conversation_id"]
+            # Update conversation history
+            history = history + [(message, data["response"])]
+            return history, data["conversation_id"]
         else:
-            return f"Error: {response.status_code} - {response.text}", conversation_id
+            error_message = f"Error: {response.status_code} - {response.text}"
+            history = history + [(message, error_message)]
+            return history, conversation_id
+            
     except Exception as e:
-        return f"API connection error: {str(e)}", conversation_id
+        error_message = f"Error connecting to API: {str(e)}"
+        history = history + [(message, error_message)]
+        return history, conversation_id
 
 def build_kb():
     try: