backend/cache.py

from __future__ import annotations

import json
from pathlib import Path

from backend.models import SpaceItem


ROOT_DIR = Path(__file__).resolve().parents[1]
DATA_DIR = ROOT_DIR / "data"


def _ensure_parent(path: Path) -> None:
    path.parent.mkdir(parents=True, exist_ok=True)


def load_spaces_cache(path: str = "data/spaces_cache.json") -> list[SpaceItem]:
    cache_path = Path(path)
    if not cache_path.exists():
        return []
    try:
        payload = json.loads(cache_path.read_text(encoding="utf-8"))
    except Exception:
        return []
    if not isinstance(payload, list):
        return []
    return [SpaceItem.from_dict(item) for item in payload if isinstance(item, dict)]


def save_spaces_cache(spaces: list[SpaceItem], path: str = "data/spaces_cache.json") -> None:
    cache_path = Path(path)
    _ensure_parent(cache_path)
    cache_path.write_text(
        json.dumps([space.to_dict() for space in spaces], indent=2, ensure_ascii=False),
        encoding="utf-8",
    )


def load_sample_spaces(path: str = "data/sample_spaces.json") -> list[SpaceItem]:
    sample_path = Path(path)
    if not sample_path.exists():
        return []
    try:
        payload = json.loads(sample_path.read_text(encoding="utf-8"))
    except Exception:
        return []
    if not isinstance(payload, list):
        return []
    return [SpaceItem.from_dict(item) for item in payload if isinstance(item, dict)]