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"""Geolocation + sunrise/sunset lookup with a manual-refresh JSON cache."""
from __future__ import annotations
import json
from datetime import datetime, tzinfo
from pathlib import Path
from typing import Optional
def to_local_hm(iso_utc: str, tz: Optional[tzinfo] = None) -> str:
"""Convert an ISO-8601 UTC timestamp to local HH:MM."""
dt = datetime.fromisoformat(iso_utc)
local = dt.astimezone(tz) # tz=None -> system local zone
return local.strftime("%H:%M")
def read_cache(path: Path) -> Optional[dict]:
path = Path(path)
if not path.exists():
return None
try:
return json.loads(path.read_text())
except (json.JSONDecodeError, OSError):
return None
def write_cache(payload: dict, path: Path) -> None:
path = Path(path)
path.parent.mkdir(parents=True, exist_ok=True)
path.write_text(json.dumps(payload, indent=2))
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