"""Preferenze persistenti del modulo Linker (prefs.json)."""
import json
from pathlib import Path

_PREFS_FILE = Path(__file__).resolve().parent / 'prefs.json'

_DEFAULTS = {
    'wizard_aggancio': None,   # None=chiedi, True=usa sempre, False=non usare mai
}


def _load() -> dict:
    if _PREFS_FILE.exists():
        try:
            return json.loads(_PREFS_FILE.read_text(encoding='utf-8'))
        except Exception:
            pass
    return {}


def _save(data: dict):
    _PREFS_FILE.write_text(json.dumps(data, indent=2, ensure_ascii=False),
                           encoding='utf-8')


def get(key: str):
    return _load().get(key, _DEFAULTS.get(key))


def set_pref(key: str, value):
    data = _load()
    data[key] = value
    _save(data)