app.py

import os
import sys
import logging
import gradio as gr
import re
import numpy as np
from sklearn.feature_extraction.text import CountVectorizer
from sklearn.naive_bayes import MultinomialNB
import asyncio
from huggingface_hub import InferenceClient
import json
import warnings

# Suppress all deprecation warnings
warnings.filterwarnings("ignore", category=DeprecationWarning)

# Set up logging
logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
logger = logging.getLogger(__name__)

def get_huggingface_api_token():
    """ Retrieves the Hugging Face API token from environment variables or a config file. """
    token = os.getenv('HUGGINGFACEHUB_API_TOKEN')
    if token:
        logger.info("Hugging Face API token found in environment variables.")
        return token

    try:
        with open('config.json', 'r') as config_file:
            config = json.load(config_file)
            token = config.get('HUGGINGFACEHUB_API_TOKEN')
            if token:
                logger.info("Hugging Face API token found in config.json file.")
                return token
    except FileNotFoundError:
        logger.warning("Config file not found.")
    except json.JSONDecodeError:
        logger.error("Error reading the config file. Please check its format.")

    logger.error("Hugging Face API token not found. Please set it up.")
    return None

def initialize_hf_client():
    """ Initializes the Hugging Face Inference Client with the API token. """
    try:
        hf_token = get_huggingface_api_token()
        if not hf_token:
            raise ValueError("Hugging Face API token is not set. Please set it up before running the application.")
        client = InferenceClient(model="mistralai/Mistral-7B-Instruct-v0.2", token=hf_token)
        logger.info("Hugging Face Inference Client initialized successfully.")
        return client
    except Exception as e:
        logger.error(f"Failed to initialize Hugging Face client: {e}")
        sys.exit(1)

client = initialize_hf_client()

def sanitize_input(input_text):
    """ Sanitizes input text by removing specific characters. """
    return re.sub(r'[<>&\']', '', input_text)

def setup_classifier():
    """ Sets up and trains a classifier for checking the relevance of a query. """
    approved_topics = ['account opening', 'trading', 'fees', 'platforms', 'funds', 'regulations', 'support']
    vectorizer = CountVectorizer()
    X = vectorizer.fit_transform(approved_topics)
    y = np.arange(len(approved_topics))
    classifier = MultinomialNB()
    classifier.fit(X, y)
    return vectorizer, classifier

vectorizer, classifier = setup_classifier()

def is_relevant_topic(query):
    """ Checks if the query is relevant based on pre-defined topics. """
    query_vector = vectorizer.transform([query])
    prediction = classifier.predict(query_vector)
    return prediction[0] in range(len(approved_topics))

def redact_sensitive_info(text):
    """ Redacts sensitive information from the text. """
    text = re.sub(r'\b\d{10,12}\b', '[REDACTED]', text)
    text = re.sub(r'[A-Z]{5}[0-9]{4}[A-Z]', '[REDACTED]', text)
    return text

def check_response_content(response):
    """ Checks response content for unauthorized claims or advice. """
    unauthorized_patterns = [
        r'\b(guarantee|assured|certain)\b.*\b(returns|profit)\b',
        r'\b(buy|sell)\b.*\b(specific stocks?|shares?)\b'
    ]
    return not any(re.search(pattern, response, re.IGNORECASE) for pattern in unauthorized_patterns)

async def generate_response(prompt):
    """ Generates a response using the Hugging Face inference client. """
    try:
        response = await client.text_generation(prompt, max_new_tokens=500, temperature=0.7)
        return response
    except Exception as e:
        logger.error(f"Error generating response: {e}")
        return "I apologize, but I'm having trouble generating a response at the moment. Please try again later."

def post_process_response(response):
    """ Post-processes the response to ensure it ends with helpful suggestions. """
    response = re.sub(r'\b(stupid|dumb|idiotic|foolish)\b', 'mistaken', response, flags=re.IGNORECASE)
    
    if not re.search(r'(Thank you|Is there anything else|Hope this helps|Let me know if you need more information)\s*$', response, re.IGNORECASE):
        response += "\n\nIs there anything else I can help you with regarding Zerodha's services?"
    
    if re.search(r'\b(invest|trade|buy|sell|market)\b', response, re.IGNORECASE):
        response += "\n\nPlease note that this information is for educational purposes only and should not be considered as financial advice. Always do your own research and consider consulting with a qualified financial advisor before making investment decisions."
    
    return response

# Gradio interface setup
with gr.Blocks() as app:
    with gr.Row():
        username = gr.Textbox(label="Username")
        password = gr.Textbox(label="Password", type="password")
        login_button = gr.Button("Login")
    
    with gr.Row():
        query_input = gr.Textbox(label="Enter your query")
        submit_button = gr.Button("Submit")
        response_output = gr.Textbox(label="Response")

    login_button.click(
        fn=lambda u, p: "Login successful" if u == "admin" and p == "admin" else "Login failed",
        inputs=[username, password],
        outputs=[gr.Text(label="Login status")]
    )

    submit_button.click(
        fn=lambda x: asyncio.run(generate_response(x)),
        inputs=[query_input],
        outputs=[response_output]
    )

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