"""
Self-contained Gradio Chatbot demo.
Run:
    python gradio_chatbot.py
Then visit the URL printed in the terminal.
"""

import gradio as gr
import time


def slow_echo(message, history):
    """
    Very simple streaming echo bot.
    You can swap this for an LLM call (OpenAI, transformers, etc.).
    """
    response = f"Echo: {message}"
    for i in range(len(response)):
        time.sleep(0.02)  # pretend we’re “typing”
        yield response[: i + 1]


demo = gr.ChatInterface(
    fn=slow_echo,
    title="Echo Bot 🤖",
    description="Type anything and watch the bot echo you back, streaming.",
    examples=["Hello, world!", "Gradio rocks!"],
    theme="soft",
    cache_examples=False,
)

if __name__ == "__main__":
    demo.launch()