import logging
import os
from logging.handlers import TimedRotatingFileHandler


def setup_logging(cfg: dict) -> None:
    log_cfg = cfg.get("logging", {})
    if not log_cfg.get("enabled", True):
        return

    path = log_cfg.get("path", "/var/server-bot/bot.log")
    rotate_when = log_cfg.get("rotate_when", "W0")
    backup_count = int(log_cfg.get("backup_count", 8))
    level = str(log_cfg.get("level", "INFO")).upper()

    os.makedirs(os.path.dirname(path), exist_ok=True)

    root = logging.getLogger()
    for handler in root.handlers:
        if isinstance(handler, TimedRotatingFileHandler) and handler.baseFilename == path:
            return

    handler = TimedRotatingFileHandler(
        path,
        when=rotate_when,
        interval=1,
        backupCount=backup_count,
        encoding="utf-8",
        utc=True,
    )
    formatter = logging.Formatter("%(asctime)s\t%(levelname)s\t%(name)s\t%(message)s")
    handler.setFormatter(formatter)

    root.setLevel(level)
    root.addHandler(handler)