from pathlib import Path
import PyPDF2
from typing import Optional

class PDFUtils:
    @staticmethod
    def extract_text_from_pdf(pdf_file: Path) -> str:
        """
        Extract text content from a PDF file
        """
        if not pdf_file.exists():
            raise FileNotFoundError(f"PDF file not found: {pdf_file}")

        text = ""
        with open(pdf_file, 'rb') as file:
            pdf_reader = PyPDF2.PdfReader(file)
            for page in pdf_reader.pages:
                text += page.extract_text() + "\n"

        return text

    @staticmethod
    def get_pdf_metadata(pdf_file: Path) -> dict:
        """
        Get metadata from a PDF file
        """
        if not pdf_file.exists():
            raise FileNotFoundError(f"PDF file not found: {pdf_file}")

        with open(pdf_file, 'rb') as file:
            pdf_reader = PyPDF2.PdfReader(file)
            metadata = pdf_reader.metadata or {}
            
            # Convert metadata to a dictionary
            result = {}
            for key, value in metadata.items():
                if value:
                    result[key] = str(value)
            
            # Add additional information
            result['num_pages'] = len(pdf_reader.pages)
            
            return result