import logging
from pathlib import Path

def setup_logger(name: str, log_file: Path = None, level=logging.INFO):
    """Sets up a logger with the given name."""
    logger = logging.getLogger(name)
    logger.setLevel(level)
    
    formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
    
    if log_file:
        file_handler = logging.FileHandler(log_file)
        file_handler.setFormatter(formatter)
        logger.addHandler(file_handler)
        
    stream_handler = logging.StreamHandler()
    stream_handler.setFormatter(formatter)
    logger.addHandler(stream_handler)
    
    return logger

def ensure_directory(path: Path):
    """Ensures a directory exists."""
    if not path.exists():
        path.mkdir(parents=True, exist_ok=True)