Process Warranty Claims with Marker and spaCy NER

                      
                     
"""
Production implementation for Processing Warranty Claims with Marker and spaCy NER.
Provides secure, scalable operations using advanced NLP techniques.
"""

import os
import logging
from typing import Dict, Any, List, Optional
import spacy
from sqlalchemy import create_engine, text
from sqlalchemy.orm import sessionmaker

# Set up logging for the application
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Load spaCy model for Named Entity Recognition
nlp = spacy.load('en_core_web_sm')

class Config:
    """
    Configuration class to load environment variables.
    """
    database_url: str = os.getenv('DATABASE_URL', 'sqlite:///warranty.db')

# Establish a connection pool for database interactions
engine = create_engine(Config.database_url, pool_pre_ping=True)
Session = sessionmaker(bind=engine)

async def validate_input(data: Dict[str, Any]) -> bool:
    """Validate request data for warranty claims.
    
    Args:
        data: Input data to validate
    Returns:
        True if valid
    Raises:
        ValueError: If validation fails
    """
    if 'customer_id' not in data or 'claim_description' not in data:
        raise ValueError('Missing customer_id or claim_description')
    return True

async def sanitize_fields(data: Dict[str, Any]) -> Dict[str, Any]:
    """Sanitize input fields to prevent injection attacks.
    
    Args:
        data: Input data to sanitize
    Returns:
        Sanitized data
    """
    return {key: str(value).strip() for key, value in data.items()}

async def process_batch(data: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
    """Process a batch of warranty claims.
    
    Args:
        data: List of claims to process
    Returns:
        Processed claims with entities
    """
    processed = []
    for item in data:
        # Process each claim description for NER
        doc = nlp(item['claim_description'])
        entities = [(ent.text, ent.label_) for ent in doc.ents]
        item['entities'] = entities
        processed.append(item)
    return processed

async def save_to_db(claims: List[Dict[str, Any]]) -> None:
    """Save processed claims to the database.
    
    Args:
        claims: List of claims to save
    """
    with Session() as session:
        for claim in claims:
            # Insert claim into the database
            session.execute(text("INSERT INTO claims (customer_id, claim_description, entities) VALUES (:customer_id, :claim_description, :entities)"),
                           {'customer_id': claim['customer_id'],
                            'claim_description': claim['claim_description'],
                            'entities': str(claim['entities'])})
        session.commit()

async def fetch_data() -> List[Dict[str, Any]]:
    """Fetch warranty claims from the database.
    
    Returns:
        List of claims
    """
    with Session() as session:
        result = session.execute(text("SELECT * FROM claims"))
        return [{'customer_id': row.customer_id, 'claim_description': row.claim_description} for row in result] 

async def format_output(claims: List[Dict[str, Any]]) -> str:
    """Format output for user display.
    
    Args:
        claims: List of claims to format
    Returns:
        Formatted string output
    """
    return '\n'.join([f'Customer ID: {claim['customer_id']}, Entities: {claim['entities']}' for claim in claims])

async def handle_errors(func):
    """Decorator for handling errors in async functions.
    
    Args:
        func: The async function to wrap
    Returns:
        Wrapper function
    """
    async def wrapper(*args, **kwargs):
        try:
            return await func(*args, **kwargs)
        except Exception as e:
            logger.error(f'Error occurred: {e}')
            raise
    return wrapper

class WarrantyClaimProcessor:
    """Main class to process warranty claims.
    """
    @handle_errors
    async def process_claims(self, data: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
        await validate_input(data)
        sanitized_data = await sanitize_fields(data)
        processed_claims = await process_batch(sanitized_data)
        await save_to_db(processed_claims)
        return processed_claims

if __name__ == '__main__':
    # Example usage
    processor = WarrantyClaimProcessor()
    claims_data = [{'customer_id': 1, 'claim_description': 'The product stopped working after 2 weeks.'},
                   {'customer_id': 2, 'claim_description': 'I received a defective item.'}]
    import asyncio
    results = asyncio.run(processor.process_claims(claims_data))
    print(results)