"""
Isolated PDF parser to avoid import conflicts in deployment
"""
import os
import re
from pathlib import Path
from typing import List, Dict, Any

def simple_pdf_text_extract(pdf_path: str) -> str:
    """
    Simple PDF text extraction using only PyMuPDF to avoid dependency conflicts
    """
    try:
        import fitz  # PyMuPDF
        
        doc = fitz.open(pdf_path)
        text = ""
        
        for page_num in range(len(doc)):
            page = doc[page_num]
            page_text = page.get_text()
            # Ensure page_text is a string
            if isinstance(page_text, str):
                text += page_text + "\n"
        
        doc.close()
        return text.strip()
        
    except Exception as e:
        raise RuntimeError(f"Error extracting text from PDF: {e}")


def fallback_parse_document(pdf_path: str) -> Dict[str, Any]:
    """
    Fallback PDF parsing function that avoids complex dependencies
    """
    try:
        text_content = simple_pdf_text_extract(pdf_path)
        
        return {
            'document_name': os.path.basename(pdf_path),
            'content': text_content,
            'total_pages': 1,  # We don't track pages in simple mode
            'parsing_method': 'simple_fallback',
            'processing_time': 0,
            'metadata': {
                'total_elements': 1,
                'text_elements': 1,
                'table_elements': 0,
                'pages_processed': 1,
                'characters_extracted': len(text_content)
            }
        }
    except Exception as e:
        return {
            'document_name': os.path.basename(pdf_path),
            'content': "",
            'total_pages': 0,
            'parsing_method': 'fallback_error',
            'processing_time': 0,
            'metadata': {
                'total_elements': 0,
                'text_elements': 0,
                'table_elements': 0,
                'pages_processed': 0,
                'characters_extracted': 0,
                'error': str(e)
            }
        }