"""Skills 快照读写。"""

from __future__ import annotations

import json
from typing import Any

from daily.config import CACHE_DIR, SNAPSHOT_FILE


def skill_id(item: dict[str, Any]) -> str:
    return str(item.get("id") or f"{item.get('source')}/{item.get('title')}")


def load_snapshot() -> set[str]:
    if not SNAPSHOT_FILE.exists():
        return set()
    try:
        data = json.loads(SNAPSHOT_FILE.read_text(encoding="utf-8"))
        return set(str(x) for x in (data.get("skill_ids") or []))
    except (OSError, json.JSONDecodeError):
        return set()


def save_snapshot(feed: dict[str, Any], date_str: str) -> None:
    CACHE_DIR.mkdir(parents=True, exist_ok=True)
    ids: list[str] = []
    for board in ("topTrending", "topHot"):
        for item in feed.get(board, [])[:20]:
            sid = skill_id(item)
            if sid not in ids:
                ids.append(sid)
    SNAPSHOT_FILE.write_text(
        json.dumps({"date": date_str, "skill_ids": ids}, ensure_ascii=False, indent=2),
        encoding="utf-8",
    )