import streamlit as st
import random
import time

# Page config
st.set_page_config(page_title="Simple ChatBot", page_icon="🤖")

# Session state for messages
if "messages" not in st.session_state:
    st.session_state.messages = []

# Title
st.title("💬 Simple ChatBot")
st.caption("Type your message below and press Enter.")

# Display chat history
for msg in st.session_state.messages:
    with st.chat_message(msg["role"]):
        st.markdown(msg["content"])

# Chat input
if prompt := st.chat_input("Ask me anything..."):
    # User message
    st.session_state.messages.append({"role": "user", "content": prompt})
    with st.chat_message("user"):
        st.markdown(prompt)

    # Bot response (simple echo + random choice)
    bot_response = random.choice(
        [
            f"Got it: {prompt}",
            f"You said: {prompt}",
            f"Interesting! You mentioned: {prompt}",
            f"Echo: {prompt}",
        ]
    )

    # Simulate typing
    with st.chat_message("assistant"):
        message_placeholder = st.empty()
        full_response = ""
        for chunk in bot_response.split():
            full_response += chunk + " "
            time.sleep(0.05)
            message_placeholder.markdown(full_response + "▌")
        message_placeholder.markdown(full_response)

    st.session_state.messages.append({"role": "assistant", "content": full_response})