Implement chat clearing functionality with confirmation and initialize session state variables

.gitignore

@@ -1,2 +1,3 @@
 chat.db
 .env
+.venv

app.py

@@ -107,6 +107,11 @@ PLIVO_PHONE_NUMBER = st.text_input(
     "Enter your phone number to chat with KORA", value="+13602304837", max_chars=15
 )
 
+# Initialize session state variables if they don't exist
+if "show_confirmation" not in st.session_state:
+    st.session_state.show_confirmation = False
+if "last_message" not in st.session_state:
+    st.session_state.last_message = ""
 
 # Display chat history
 try:
@@ -124,6 +129,34 @@ try:
 except sqlite3.Error as e:
     st.error(f"Error fetching messages: {e}")
 
+# Add a "Clear Chat" button with confirmation
+if not st.session_state.show_confirmation:
+    clear_chat_button = st.button("Clear Chat")
+    if clear_chat_button:
+        st.session_state.show_confirmation = True
+        st.rerun()
+else:
+    confirmation_col1, confirmation_col2 = st.columns(2)
+    with confirmation_col1:
+        confirm_clear = st.button("Yes, clear chat")
+    with confirmation_col2:
+        cancel_clear = st.button("Cancel")
+    
+    if confirm_clear:
+        try:
+            with db_lock:
+                c.execute("DELETE FROM messages")
+                conn.commit()
+            st.session_state.show_confirmation = False
+            st.session_state.last_message = ""
+            st.success("Chat history cleared successfully.")
+            st.rerun()  # Refresh the page to show empty chat
+        except sqlite3.Error as e:
+            st.error(f"Error clearing chat history: {e}")
+    elif cancel_clear:
+        st.session_state.show_confirmation = False
+        st.rerun()  # Refresh the page to remove confirmation buttons
+
 # Input + Send
 if prompt := st.chat_input("Type your message..."):
     try:
@@ -170,4 +203,11 @@ def check_for_new_messages():
         time.sleep(5)
 
 
-check_for_new_messages()
+# Start the message checking thread only once as a daemon thread
+if not hasattr(st, "message_checker_started"):
+    try:
+        message_thread = threading.Thread(target=check_for_new_messages, daemon=True)
+        message_thread.start()
+        st.message_checker_started = True
+    except Exception as e:
+        logging.error(f"Error starting message checker thread: {e}")