"""Logging configuration for the sync service.

Configures the root logger with a RotatingFileHandler (10 MB x 5, UTF-8) plus
a console StreamHandler. The level and log path come from ``cfg.logging``.
"""
import logging
import logging.handlers
import os


def setup_logging(cfg_dict: dict | None):
    """Configure root logging from the ``cfg.logging`` dict.

    ``cfg_dict`` is ``SyncConfig.logging`` (a dict or None). ``level`` is a
    logging-level name string (default ``"INFO"``); ``path`` is the log file
    path (default ``"sync.log"``). The parent directory is created if missing.
    """
    level = getattr(logging, (cfg_dict or {}).get("level", "INFO")) if cfg_dict else logging.INFO
    path = (cfg_dict or {}).get("path", "sync.log")
    os.makedirs(os.path.dirname(path) or ".", exist_ok=True)
    h = logging.handlers.RotatingFileHandler(
        path, maxBytes=10 * 1024 * 1024, backupCount=5, encoding="utf-8"
    )
    h.setFormatter(logging.Formatter("%(asctime)s %(levelname)s [%(name)s] %(message)s"))
    root = logging.getLogger()
    root.setLevel(level)
    root.addHandler(h)
    sh = logging.StreamHandler()
    sh.setFormatter(logging.Formatter("%(levelname)s %(message)s"))
    root.addHandler(sh)