Update app.py

app.py

@@ -20,9 +20,6 @@ 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"
 
@@ -53,12 +50,7 @@ def analyze_sentiment(user_text):
 def predict_action(user_text):
     if "NASA" in user_text or "space" in user_text:
         return "nasa_info"
-    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"
+    return "general_query"
 
 def generate_follow_up(user_text):
     """
@@ -78,7 +70,6 @@ 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)
@@ -114,19 +105,10 @@ 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})
 
-    # ✅ 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
+    follow_up = generate_follow_up(user_text)
+    chat_history.append({'role': 'assistant', 'content': follow_up})
 
-    return response, st.session_state.follow_up, chat_history, None
+    return response, follow_up, chat_history, None
 
 # --- Chat UI ---
 st.title("🚀 HAL - Your NASA AI Assistant")
@@ -137,10 +119,41 @@ 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.session_state.last_topic = ""
     st.experimental_rerun()
 
-# --- Chat History Display ---
+# 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.markdown("<div class='container'>", unsafe_allow_html=True)
 
 for message in st.session_state.chat_history:
@@ -155,8 +168,10 @@ 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,
@@ -171,10 +186,9 @@ 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  
+    st.session_state.response_ready = True  # Enables follow-up response cycle
 
 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
-