Code Editor for app.py

import streamlit as st
import random
import time

def response_generator():
    responses = [
        "Hello there! How can I assist you today?",
        "Hi, human! Is there anything I can help you with?",
        "Do you need help?",
    ]
    return random.choice(responses)

st.set_page_config(page_title="Simple Chat Bot")
st.title("Simple Chat Bot")

# Initialize chat history and waiting state in session_state
if "messages" not in st.session_state:
    st.session_state.messages = []
if "waiting_for_response" not in st.session_state:
    st.session_state.waiting_for_response = False

# 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 and control its disabled state based on waiting_for_response
if not st.session_state.waiting_for_response:
    prompt = st.chat_input("What is up?", disabled=st.session_state.waiting_for_response)
    if prompt:
        # Add user message to chat history
        st.session_state.messages.append({"role": "user", "content": prompt})
        # Display user message in chat message container
        with st.chat_message("user"):
            st.markdown(prompt)
        
        # Set state to wait for assistant response
        st.session_state.waiting_for_response = True
        st.rerun()  # Re-render the page to disable the input

# If waiting for assistant response, generate and display it
if st.session_state.waiting_for_response:
    with st.spinner("Assistant is typing..."):
        # Simulate response time
        time.sleep(1)  # Adjust the sleep time as needed
        response = response_generator()
        # Add assistant response to chat history
        st.session_state.messages.append({"role": "assistant", "content": response})
        # Display assistant response in chat message container
        with st.chat_message("assistant"):
            st.markdown(response)
    
    # Reset the waiting state to re-enable input
    st.session_state.waiting_for_response = False
    st.rerun()  # Re-render the page to enable the input