"""PDF text extraction utilities."""
import io
from typing import Optional
from PyPDF2 import PdfReader


def extract_text_from_pdf(pdf_bytes: bytes) -> Optional[str]:
    """
    Extract text content from a PDF file.
    
    Args:
        pdf_bytes: PDF file content as bytes
        
    Returns:
        Extracted text as string, or None if extraction fails
    """
    try:
        pdf_file = io.BytesIO(pdf_bytes)
        reader = PdfReader(pdf_file)
        
        text_parts = []
        for page in reader.pages:
            text = page.extract_text()
            if text:
                text_parts.append(text)
        
        full_text = "\n\n".join(text_parts)
        return full_text if full_text.strip() else None
    except Exception as e:
        print(f"Error extracting text from PDF: {e}")
        return None