138 lines
4.0 KiB
Python
138 lines
4.0 KiB
Python
"""Helpers for sun events."""
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from __future__ import annotations
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import datetime
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from typing import TYPE_CHECKING
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from homeassistant.const import SUN_EVENT_SUNRISE, SUN_EVENT_SUNSET
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from homeassistant.core import HomeAssistant, callback
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from homeassistant.loader import bind_hass
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from homeassistant.util import dt as dt_util
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if TYPE_CHECKING:
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import astral
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DATA_LOCATION_CACHE = "astral_location_cache"
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ELEVATION_AGNOSTIC_EVENTS = ("noon", "midnight")
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@callback
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@bind_hass
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def get_astral_location(
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hass: HomeAssistant,
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) -> tuple[astral.location.Location, astral.Elevation]:
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"""Get an astral location for the current Home Assistant configuration."""
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from astral import LocationInfo # pylint: disable=import-outside-toplevel
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from astral.location import Location # pylint: disable=import-outside-toplevel
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latitude = hass.config.latitude
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longitude = hass.config.longitude
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timezone = str(hass.config.time_zone)
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elevation = hass.config.elevation
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info = ("", "", timezone, latitude, longitude)
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# Cache astral locations so they aren't recreated with the same args
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if DATA_LOCATION_CACHE not in hass.data:
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hass.data[DATA_LOCATION_CACHE] = {}
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if info not in hass.data[DATA_LOCATION_CACHE]:
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hass.data[DATA_LOCATION_CACHE][info] = Location(LocationInfo(*info))
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return hass.data[DATA_LOCATION_CACHE][info], elevation
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@callback
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@bind_hass
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def get_astral_event_next(
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hass: HomeAssistant,
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event: str,
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utc_point_in_time: datetime.datetime | None = None,
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offset: datetime.timedelta | None = None,
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) -> datetime.datetime:
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"""Calculate the next specified solar event."""
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location, elevation = get_astral_location(hass)
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return get_location_astral_event_next(
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location, elevation, event, utc_point_in_time, offset
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)
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@callback
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def get_location_astral_event_next(
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location: astral.location.Location,
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elevation: astral.Elevation,
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event: str,
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utc_point_in_time: datetime.datetime | None = None,
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offset: datetime.timedelta | None = None,
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) -> datetime.datetime:
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"""Calculate the next specified solar event."""
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if offset is None:
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offset = datetime.timedelta()
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if utc_point_in_time is None:
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utc_point_in_time = dt_util.utcnow()
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kwargs = {"local": False}
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if event not in ELEVATION_AGNOSTIC_EVENTS:
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kwargs["observer_elevation"] = elevation
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mod = -1
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while True:
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try:
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next_dt: datetime.datetime = (
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getattr(location, event)(
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dt_util.as_local(utc_point_in_time).date()
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+ datetime.timedelta(days=mod),
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**kwargs,
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)
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+ offset
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)
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if next_dt > utc_point_in_time:
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return next_dt
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except ValueError:
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pass
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mod += 1
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@callback
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@bind_hass
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def get_astral_event_date(
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hass: HomeAssistant,
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event: str,
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date: datetime.date | datetime.datetime | None = None,
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) -> datetime.datetime | None:
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"""Calculate the astral event time for the specified date."""
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location, elevation = get_astral_location(hass)
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if date is None:
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date = dt_util.now().date()
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if isinstance(date, datetime.datetime):
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date = dt_util.as_local(date).date()
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kwargs = {"local": False}
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if event not in ELEVATION_AGNOSTIC_EVENTS:
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kwargs["observer_elevation"] = elevation
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try:
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return getattr(location, event)(date, **kwargs) # type: ignore
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except ValueError:
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# Event never occurs for specified date.
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return None
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@callback
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@bind_hass
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def is_up(
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hass: HomeAssistant, utc_point_in_time: datetime.datetime | None = None
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) -> bool:
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"""Calculate if the sun is currently up."""
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if utc_point_in_time is None:
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utc_point_in_time = dt_util.utcnow()
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next_sunrise = get_astral_event_next(hass, SUN_EVENT_SUNRISE, utc_point_in_time)
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next_sunset = get_astral_event_next(hass, SUN_EVENT_SUNSET, utc_point_in_time)
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return next_sunrise > next_sunset
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