app.py

import streamlit as st
import requests
import logging
import time

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Set page configuration
st.set_page_config(
    page_title="DeepSeek Chatbot - NextGenWebAI",
    page_icon="🤖",
    layout="wide"
)

# Custom CSS for UI Enhancements
st.markdown("""
    <style>
    body {
        font-family: 'Arial', sans-serif;
    }
    .stChatMessage {
        border-radius: 10px;
        padding: 10px;
        margin: 5px 0;
    }
    .user {
        background-color: #007BFF;
        color: white;
        text-align: right;
        border-radius: 12px 12px 0px 12px;
    }
    .assistant {
        background-color: #F1F1F1;
        color: black;
        text-align: left;
        border-radius: 12px 12px 12px 0px;
    }
    .sidebar .sidebar-content {
        background-color: #222;
        color: white;
    }
    </style>
""", unsafe_allow_html=True)

# Initialize session state for chat history
if "messages" not in st.session_state:
    st.session_state.messages = []

# Sidebar Configuration
with st.sidebar:
    st.image("https://huggingface.co/front/thumbnails/hf-logo.png", width=150)
    st.header("⚙️ Model Configuration")
    st.markdown("[🔑 Get HuggingFace Token](https://huggingface.co/settings/tokens)")

    # Model selection
    model_options = [
        "deepseek-ai/DeepSeek-R1-Distill-Qwen-32B",
    ]
    selected_model = st.selectbox("🔍 Select AI Model", model_options, index=0)

    # System prompt
    system_message = st.text_area(
        "📜 System Instructions",
        value="You are a friendly chatbot. Provide clear and engaging responses.",
        height=80
    )

    # Chat settings
    max_tokens = st.slider("🔢 Max Tokens", 10, 4000, 300)
    temperature = st.slider("🔥 Temperature", 0.1, 2.0, 0.7)
    top_p = st.slider("🎯 Top-p", 0.1, 1.0, 0.9)

# Function to query the Hugging Face API
def query(payload, api_url):
    headers = {"Authorization": f"Bearer {st.secrets['HF_TOKEN']}"}
    try:
        response = requests.post(api_url, headers=headers, json=payload)
        response.raise_for_status()  # Raise HTTP errors if any
        return response.json()
    except requests.exceptions.RequestException as e:
        logger.error(f"Request Error: {e}")
        return None

# Main Chat Interface
st.title("🤖 DeepSeek Chatbot")
st.caption("🚀 AI-powered chatbot using Hugging Face API")

# Display chat history with enhanced UI
for message in st.session_state.messages:
    with st.chat_message(message["role"]):
        class_name = "user" if message["role"] == "user" else "assistant"
        st.markdown(f"<div class='{class_name}'>{message['content']}</div>", unsafe_allow_html=True)

# Handle user input
if prompt := st.chat_input("💬 Type your message..."):
    st.session_state.messages.append({"role": "user", "content": prompt})

    with st.chat_message("user"):
        st.markdown(f"<div class='user'>{prompt}</div>", unsafe_allow_html=True)

    try:
        with st.spinner("🤖 Thinking..."):
            time.sleep(1)  # Simulate processing time
            full_prompt = f"{system_message}\n\nUser: {prompt}\nAssistant:"
            payload = {
                "inputs": full_prompt,
                "parameters": {
                    "max_new_tokens": max_tokens,
                    "temperature": temperature,
                    "top_p": top_p,
                    "return_full_text": False
                }
            }

            api_url = f"https://api-inference.huggingface.co/models/{selected_model}"
            output = query(payload, api_url)

            if output and isinstance(output, list) and 'generated_text' in output[0]:
                assistant_response = output[0]['generated_text'].strip()
                with st.chat_message("assistant"):
                    st.markdown(f"<div class='assistant'>{assistant_response}</div>", unsafe_allow_html=True)
                st.session_state.messages.append({"role": "assistant", "content": assistant_response})
            else:
                st.error("⚠️ Unable to generate a response. Please try again.")
    except Exception as e:
        logger.error(f"Application Error: {str(e)}", exc_info=True)
        st.error(f"⚠️ Error: {str(e)}")