101 lines
3.2 KiB
Python
101 lines
3.2 KiB
Python
'''
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Simple location provider, serving as a fallback when more detailed data isn't available
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'''
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from __future__ import annotations
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from collections.abc import Iterator, Sequence
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from dataclasses import dataclass
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from datetime import datetime, time, timezone
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from functools import cache
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from typing import cast
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from my.config import location as user_config
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from my.location.common import DateIsh, LatLon
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from my.location.fallback.common import DateExact, FallbackLocation
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@dataclass
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class Config(user_config):
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home: LatLon | Sequence[tuple[DateIsh, LatLon]]
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# default ~30km accuracy
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# this is called 'home_accuracy' since it lives on the base location.config object,
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# to differentiate it from accuracy for other providers
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home_accuracy: float = 30_000.0
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# TODO could make current Optional and somehow determine from system settings?
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@property
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def _history(self) -> Sequence[tuple[datetime, LatLon]]:
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home1 = self.home
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# todo ugh, can't test for isnstance LatLon, it's a tuple itself
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home2: Sequence[tuple[DateIsh, LatLon]]
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if isinstance(home1[0], tuple):
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# already a sequence
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home2 = cast(Sequence[tuple[DateIsh, LatLon]], home1)
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else:
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# must be a pair of coordinates. also doesn't really matter which date to pick?
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loc = cast(LatLon, home1)
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home2 = [(datetime.min, loc)]
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# todo cache?
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res = []
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for x, loc in home2:
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dt: datetime
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if isinstance(x, str):
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dt = datetime.fromisoformat(x)
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elif isinstance(x, datetime):
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dt = x
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else:
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dt = datetime.combine(x, time.min)
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# todo not sure about doing it here, but makes it easier to compare..
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if dt.tzinfo is None:
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dt = dt.replace(tzinfo=timezone.utc)
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res.append((dt, loc))
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res = sorted(res, key=lambda p: p[0])
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return res
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from ...core.cfg import make_config
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config = make_config(Config)
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@cache
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def get_location(dt: datetime) -> LatLon:
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'''
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Interpolates the location at dt
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'''
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loc = list(estimate_location(dt))
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assert len(loc) == 1
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return loc[0].lat, loc[0].lon
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# TODO: in python3.8, use functools.cached_property instead?
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@cache
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def homes_cached() -> list[tuple[datetime, LatLon]]:
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return list(config._history)
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def estimate_location(dt: DateExact) -> Iterator[FallbackLocation]:
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from my.location.fallback.common import _datetime_timestamp
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d: float = _datetime_timestamp(dt)
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hist = list(reversed(homes_cached()))
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for pdt, (lat, lon) in hist:
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if d >= pdt.timestamp():
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yield FallbackLocation(
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lat=lat,
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lon=lon,
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accuracy=config.home_accuracy,
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dt=datetime.fromtimestamp(d, timezone.utc),
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datasource='via_home')
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return
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# I guess the most reasonable is to fallback on the first location
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lat, lon = hist[-1][1]
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yield FallbackLocation(
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lat=lat,
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lon=lon,
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accuracy=config.home_accuracy,
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dt=datetime.fromtimestamp(d, timezone.utc),
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datasource='via_home')
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