app.py

import gradio as gr
from huggingface_hub import InferenceClient
import uuid

# Hugging Face inference client
client = InferenceClient("HuggingFaceH4/zephyr-7b-beta")

def respond(message, history, system_message, max_tokens, temperature, top_p):
    messages = [{"role": "system", "content": system_message}]

    for user_msg, bot_msg in history:
        if user_msg:
            messages.append({"role": "user", "content": user_msg})
        if bot_msg:
            messages.append({"role": "assistant", "content": bot_msg})
    
    messages.append({"role": "user", "content": message})
    response = ""
    
    for msg in client.chat_completion(
        messages,
        max_tokens=max_tokens,
        stream=True,
        temperature=temperature,
        top_p=top_p,
    ):
        token = msg.choices[0].delta.content
        response += token
        yield response

# ChatGPT-style UI with modern styling
css = """
    body {
        background-color: #121212;
        color: white;
        font-family: Arial, sans-serif;
    }
    .gradio-container {
        max-width: 900px;
        margin: auto;
        padding: 20px;
    }
    .chat-container {
        display: flex;
        flex-direction: column;
        height: 80vh;
        overflow-y: auto;
        padding: 20px;
        border-radius: 10px;
        background: #1E1E1E;
    }
    .chat-message {
        max-width: 75%;
        padding: 12px 16px;
        margin: 8px 0;
        border-radius: 10px;
        font-size: 16px;
        display: inline-block;
    }
    .user-message {
        background-color: #007AFF;
        align-self: flex-end;
        color: white;
    }
    .bot-message {
        background-color: #333;
        align-self: flex-start;
    }
    .input-box {
        background: #333;
        border: none;
        color: white;
        border-radius: 8px;
        padding: 12px;
        font-size: 16px;
        width: 100%;
    }
    .controls {
        display: flex;
        justify-content: center;
        gap: 10px;
        margin-top: 10px;
    }
"""

with gr.Blocks(css=css) as demo:
    gr.Markdown("""
    <h1 style='text-align: center; color: #FFFFFF;'>💬 AI Chat Assistant</h1>
    <p style='text-align: center;'>A sleek, modern chatbot experience.</p>
    """)
    
    chatbot = gr.ChatInterface(
        respond,
        additional_inputs=[],
        textbox=gr.Textbox(placeholder="Type a message...", lines=1, interactive=True, elem_classes="input-box"),
    )

demo.launch()