Update app.py

app.py

@@ -20,6 +20,9 @@ if "response_ready" not in st.session_state:
 if "follow_up" not in st.session_state:
     st.session_state.follow_up = ""  # Stores follow-up question
 
+if "last_topic" not in st.session_state:
+    st.session_state.last_topic = ""  # Stores last user topic
+
 # --- Set Up Model & API Functions ---
 model_id = "mistralai/Mistral-7B-Instruct-v0.3"
 
@@ -50,7 +53,12 @@ def analyze_sentiment(user_text):
 def predict_action(user_text):
     if "NASA" in user_text or "space" in user_text:
         return "nasa_info"
-    return "general_query"
+    elif "quantum" in user_text or "physics" in user_text or "quark" in user_text:
+        return "physics"
+    elif "AI" in user_text or "machine learning" in user_text:
+        return "AI"
+    else:
+        return "general_query"
 
 def generate_follow_up(user_text):
     """
@@ -70,6 +78,7 @@ def generate_follow_up(user_text):
 def get_response(system_message, chat_history, user_text, max_new_tokens=256):
     """
     Generates HAL's response, making it more conversational and engaging.
+    Detects if the user has switched topics and removes previous follow-up questions if needed.
     """
     sentiment = analyze_sentiment(user_text)
     action = predict_action(user_text)
@@ -105,10 +114,19 @@ def get_response(system_message, chat_history, user_text, max_new_tokens=256):
     chat_history.append({'role': 'user', 'content': user_text})
     chat_history.append({'role': 'assistant', 'content': response})
 
-    follow_up = generate_follow_up(user_text)
-    chat_history.append({'role': 'assistant', 'content': follow_up})
+    # ✅ Detect if the topic has changed
+    current_topic = action  # Predicts topic based on user input
+
+    if current_topic != st.session_state.last_topic:
+        st.session_state.follow_up = ""  # Clear previous follow-up question if topic changed
+    else:
+        follow_up = generate_follow_up(user_text)
+        chat_history.append({'role': 'assistant', 'content': follow_up})
+        st.session_state.follow_up = follow_up  # Store the new follow-up question
+
+    st.session_state.last_topic = current_topic  # Update last topic for next check
 
-    return response, follow_up, chat_history, None
+    return response, st.session_state.follow_up, chat_history, None
 
 # --- Chat UI ---
 st.title("🚀 HAL - Your NASA AI Assistant")
@@ -119,41 +137,10 @@ if st.sidebar.button("Reset Chat"):
     st.session_state.chat_history = [{"role": "assistant", "content": "Hello! How can I assist you today?"}]
     st.session_state.response_ready = False
     st.session_state.follow_up = ""
-    st.experimental_rerun()
-
-# Custom Chat Styling
-st.markdown("""
-    <style>
-    .user-msg {
-        background-color: #0078D7;
-        color: white;
-        padding: 10px;
-        border-radius: 10px;
-        margin-bottom: 5px;
-        width: fit-content;
-        max-width: 80%;
-    }
-    .assistant-msg {
-        background-color: #333333;
-        color: white;
-        padding: 10px;
-        border-radius: 10px;
-        margin-bottom: 5px;
-        width: fit-content;
-        max-width: 80%;
-    }
-    .container {
-        display: flex;
-        flex-direction: column;
-        align-items: flex-start;
-    }
-    @media (max-width: 600px) {
-        .user-msg, .assistant-msg { font-size: 16px; max-width: 100%; }
-    }
-    </style>
-""", unsafe_allow_html=True)
-
-# --- Chat History Display (Ensures All Messages Are Visible) ---
+    st.session_state.last_topic = ""
+    st.rerun()  # ✅ Fixed: Correct method to reset the app in newer Streamlit versions
+
+# --- Chat History Display ---
 st.markdown("<div class='container'>", unsafe_allow_html=True)
 
 for message in st.session_state.chat_history:
@@ -168,10 +155,8 @@ st.markdown("</div>", unsafe_allow_html=True)
 user_input = st.chat_input("Type your message here...")  # Uses Enter to submit
 
 if user_input:
-    # Save user message in chat history
     st.session_state.chat_history.append({'role': 'user', 'content': user_input})  
 
-    # Generate HAL's response
     response, follow_up, st.session_state.chat_history, image_url = get_response(
         system_message="You are a helpful AI assistant.",
         user_text=user_input,
@@ -186,9 +171,8 @@ if user_input:
         st.image(image_url, caption="NASA Image of the Day")
 
     st.session_state.follow_up = follow_up
-    st.session_state.response_ready = True  # Enables follow-up response cycle
+    st.session_state.response_ready = True  
 
 if st.session_state.response_ready and st.session_state.follow_up:
-    st.session_state.chat_history.append({'role': 'assistant', 'content': st.session_state.follow_up})
     st.markdown(f"<div class='assistant-msg'><strong>HAL:</strong> {st.session_state.follow_up}</div>", unsafe_allow_html=True)
     st.session_state.response_ready = False