#!/usr/bin/env python3
"""
utils.py - Shared utilities: config loading, logging setup.
"""

import logging
import logging.handlers
import sys
from pathlib import Path

try:
    import yaml
except ImportError:
    yaml = None


DEFAULT_CONFIG_PATHS = [
    "/etc/ns8-backup-monitor/config.yml",
    "/opt/ns8-backup-monitor/config/config.yml",
    "config/config.yml",
]


def load_config(path: str = None) -> dict:
    if yaml is None:
        raise ImportError("PyYAML not installed. Run: pip3 install pyyaml")

    paths = [path] if path else DEFAULT_CONFIG_PATHS
    for p in paths:
        if p and Path(p).exists():
            with open(p) as f:
                return yaml.safe_load(f) or {}

    raise FileNotFoundError(
        f"No config file found. Tried: {paths}\n"
        "Copy config/config.yml.example to config/config.yml and edit it."
    )


def setup_logging(config: dict):
    log_cfg = config.get("logging", {})
    level = getattr(logging, log_cfg.get("level", "INFO").upper(), logging.INFO)
    log_file = log_cfg.get("file", "")

    handlers = [logging.StreamHandler(sys.stdout)]
    if log_file:
        handlers.append(
            logging.handlers.RotatingFileHandler(
                log_file, maxBytes=5 * 1024 * 1024, backupCount=3
            )
        )

    logging.basicConfig(
        level=level,
        format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
        handlers=handlers,
    )