app.py

import streamlit as st

# Set page config
st.set_page_config(
    page_title="Echo Chatbot",
    page_icon="🤖",
    layout="centered",
    initial_sidebar_state="collapsed"
)

# App title and description
st.title("🤖 Echo Chatbot")
st.write("I'm a simple echo bot - I'll repeat everything you say!")

# Initialize chat history
if "messages" not in st.session_state:
    st.session_state.messages = []
    # Add a welcome message
    st.session_state.messages.append({
        "role": "assistant", 
        "content": "Hello! I'm your echo bot. Type something and I'll echo it back to 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("Type your message here..."):
    # Add user message to chat history
    st.session_state.messages.append({"role": "user", "content": prompt})
    
    # Display user message
    with st.chat_message("user"):
        st.markdown(prompt)
    
    # Generate echo response
    echo_response = f"You said: '{prompt}'"
    
    # Add assistant response to chat history
    st.session_state.messages.append({"role": "assistant", "content": echo_response})
    
    # Display assistant response
    with st.chat_message("assistant"):
        st.markdown(echo_response)

# Add a sidebar with info
with st.sidebar:
    st.header("ℹ️ About")
    st.write("This is a simple echo chatbot built with Streamlit.")
    st.write("**Features:**")
    st.write("- Echoes your messages")
    st.write("- Maintains chat history")
    st.write("- Clean chat interface")
    
    if st.button("Clear Chat History"):
        st.session_state.messages = []
        st.session_state.messages.append({
            "role": "assistant", 
            "content": "Hello! I'm your echo bot. Type something and I'll echo it back to you! 👋"
        })
        st.rerun()

# Footer
st.markdown("---")
st.markdown("Built with ❤️ using Streamlit")