# app/storage.py
from __future__ import annotations
from pathlib import Path
import json
from typing import Dict, Any

STATE_DIR = Path("data/user_state")
STATE_DIR.mkdir(parents=True, exist_ok=True)

def _file(user_id: str) -> Path:
    return STATE_DIR / f"{user_id}.json"

def load_state(user_id: str) -> Dict[str, Any]:
    p = _file(user_id)
    if not p.exists():
        return {"saved": [], "hidden": []}
    try:
        return json.loads(p.read_text(encoding="utf-8"))
    except Exception:
        return {"saved": [], "hidden": []}

def save_state(user_id: str, state: Dict[str, Any]) -> None:
    p = _file(user_id)
    p.write_text(json.dumps(state, ensure_ascii=False, indent=2), encoding="utf-8")