import os
import logging
from pathlib import Path


def allowed_file(filename, allowed_extensions):
    """Check if file extension is allowed."""
    return '.' in filename and \
           filename.rsplit('.', 1)[1].lower() in allowed_extensions


def setup_logging():
    """Setup simple logging configuration."""
    # Create logs directory
    log_dir = Path('logs')
    log_dir.mkdir(exist_ok=True)
    
    # Configure logging
    logging.basicConfig(
        level=logging.INFO,
        format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
        handlers=[
            logging.FileHandler('logs/app.log'),
            logging.StreamHandler()
        ]
    )
    
    # Set levels for noisy libraries
    logging.getLogger('werkzeug').setLevel(logging.WARNING)
    logging.getLogger('ultralytics').setLevel(logging.WARNING)


def validate_image_size(file_size, max_size):
    """Validate image file size."""
    return file_size <= max_size


def get_file_extension(filename):
    """Get file extension from filename."""
    return filename.rsplit('.', 1)[1].lower() if '.' in filename else ''