Update app.py

app.py

@@ -1,9 +1,22 @@
 import streamlit as st
+import random
+import time
 
-st.title("Chat UI")
+st.title("Simple chat")
 
-user_input = st.text_input("You: ")
+# Initialize chat history
+if "messages" not in st.session_state:
+    st.session_state.messages = []
 
-if st.button("Send"):
-    st.write("You: ", user_input)
-    st.write("Bot: Hello, How can I help you?")
+# Display chat messages from history on app rerun
+for message in st.session_state.messages:
+    with st.chat_message(message["role"]):
+        st.markdown(message["content"])
+
+# Accept user input
+if prompt := st.chat_input("What is up?"):
+    # Display user message in chat message container
+    with st.chat_message("user"):
+        st.markdown(prompt)
+    # Add user message to chat history
+    st.session_state.messages.append({"role": "user", "content": prompt})