"""Configuration management — persists Mealie connection settings to a JSON file."""

import json
import os
from pathlib import Path

DATA_DIR = Path(os.environ.get("DATA_DIR", "/data"))
CONFIG_FILE = DATA_DIR / "config.json"

_DEFAULTS = {
    "mealie_url": "",
    "mealie_api_key": "",
}


def _ensure_dir():
    DATA_DIR.mkdir(parents=True, exist_ok=True)


def load() -> dict:
    """Return the current config dict, merged with defaults."""
    cfg = dict(_DEFAULTS)
    if CONFIG_FILE.exists():
        try:
            with open(CONFIG_FILE, "r", encoding="utf-8") as f:
                cfg.update(json.load(f))
        except (json.JSONDecodeError, OSError):
            pass
    return cfg


def save(cfg: dict):
    """Atomically persist *cfg* to disk."""
    _ensure_dir()
    tmp = CONFIG_FILE.with_suffix(".tmp")
    with open(tmp, "w", encoding="utf-8") as f:
        json.dump(cfg, f, indent=2, ensure_ascii=False)
    tmp.replace(CONFIG_FILE)