import functools
import logging

logging.basicConfig(level=logging.INFO, format="%(asctime)s — %(message)s")
logger = logging.getLogger(__name__)

def log_step(func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        logger.info(f"START  {func.__name__}")
        try:
            result = func(*args, **kwargs)
            logger.info(f"END    {func.__name__} — OK")
            return result
        except Exception as e:
            logger.error(f"FAIL   {func.__name__} — {type(e).__name__}: {e}")
            raise
    return wrapper