"""File extraction utilities for DMARC reports"""

import gzip
import zipfile
import tempfile
import os
from pathlib import Path


def extract_files(file_path):
    """Extract XML content from gzip or zip files

    Args:
        file_path: Path to the compressed file

    Returns:
        str: XML content if successful, None otherwise
    """
    file_path = Path(file_path)

    try:
        if file_path.suffix == '.gz':
            return _extract_gzip(file_path)
        elif file_path.suffix == '.zip':
            return _extract_zip(file_path)
        else:
            # Assume it's already XML
            return file_path.read_text()
    except Exception as e:
        print(f"Error extracting {file_path}: {e}")
        return None


def _extract_gzip(file_path):
    """Extract content from gzip file"""
    with gzip.open(file_path, 'rt') as f:
        return f.read()


def _extract_zip(file_path):
    """Extract content from zip file

    For zip files, we look for XML files inside and return the first one
    """
    with zipfile.ZipFile(file_path, 'r') as zip_ref:
        # List all files in the zip
        file_list = zip_ref.namelist()

        # Find the first XML file
        xml_file = None
        for filename in file_list:
            if filename.lower().endswith('.xml'):
                xml_file = filename
                break

        if xml_file:
            with zip_ref.open(xml_file) as f:
                return f.read().decode('utf-8')
        else:
            # If no XML file found, try the first file
            if file_list:
                with zip_ref.open(file_list[0]) as f:
                    return f.read().decode('utf-8')

    return None