import logging
import os
from typing import Final


DEFAULT_LOG_LEVEL: Final[str] = "INFO"
DEFAULT_LOG_FORMAT: Final[str] = (
    "%(asctime)s | %(levelname)s | %(name)s | %(message)s"
)

_configured = False


def _resolve_log_level() -> int:
    level_name = os.getenv("LOG_LEVEL", DEFAULT_LOG_LEVEL).upper()
    return getattr(logging, level_name, logging.INFO)


def setup_logging() -> None:
    global _configured

    if _configured:
        return

    root_logger = logging.getLogger()
    root_logger.setLevel(_resolve_log_level())

    if not root_logger.handlers:
        handler = logging.StreamHandler()
        handler.setFormatter(logging.Formatter(DEFAULT_LOG_FORMAT))
        root_logger.addHandler(handler)

    _configured = True


def get_logger(name: str) -> logging.Logger:
    setup_logging()
    return logging.getLogger(name)