import logging
import os


def get_logger(name: str) -> logging.Logger:
    """Return a named logger with a StreamHandler, creating handlers only once.

    Level defaults to INFO; override with the LOG_LEVEL environment variable.
    """
    logger = logging.getLogger(name)
    if not logger.handlers:
        handler = logging.StreamHandler()
        handler.setFormatter(
            logging.Formatter(
                "%(asctime)s | %(levelname)-8s | %(name)s — %(message)s",
                datefmt="%Y-%m-%d %H:%M:%S",
            )
        )
        logger.addHandler(handler)
    logger.setLevel(os.getenv("LOG_LEVEL", "INFO").upper())
    return logger