"""
Handles processing of document inputs (e.g., PDFs, Word docs).
"""
import logging

logger = logging.getLogger(__name__)

def process_document_input(doc_data: bytes) -> str:
    """
    Placeholder for document input processing.
    This will eventually involve text extraction from files like PDFs.

    Args:
        doc_data: The raw bytes of the document file.

    Returns:
        The extracted text, or an empty string if failed.
    """
    logger.info("Processing document input (stub).")
    # In a real implementation, you would use a library like PyMuPDF for PDFs.
    # For example:
    # try:
    #     import fitz  # PyMuPDF
    #     with fitz.open(stream=doc_data, filetype="pdf") as doc:
    #         text = "".join(page.get_text() for page in doc)
    #     return text
    # except Exception as e:
    #     logger.error(f"PDF processing failed: {e}")
    #     return ""

    return "Sample text extracted from PDF document."