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"""
    babel.localtime._fallback
    ~~~~~~~~~~~~~~~~~~~~~~~~~

    Emulated fallback local timezone when all else fails.

    :copyright: (c) 2013-2023 by the Babel Team.
    :license: BSD, see LICENSE for more details.
"""

import datetime
import time

STDOFFSET = datetime.timedelta(seconds=-time.timezone)
DSTOFFSET = datetime.timedelta(seconds=-time.altzone) if time.daylight else STDOFFSET

DSTDIFF = DSTOFFSET - STDOFFSET
ZERO = datetime.timedelta(0)


class _FallbackLocalTimezone(datetime.tzinfo):

    def utcoffset(self, dt: datetime.datetime) -> datetime.timedelta:
        if self._isdst(dt):
            return DSTOFFSET
        else:
            return STDOFFSET

    def dst(self, dt: datetime.datetime) -> datetime.timedelta:
        if self._isdst(dt):
            return DSTDIFF
        else:
            return ZERO

    def tzname(self, dt: datetime.datetime) -> str:
        return time.tzname[self._isdst(dt)]

    def _isdst(self, dt: datetime.datetime) -> bool:
        tt = (dt.year, dt.month, dt.day,
              dt.hour, dt.minute, dt.second,
              dt.weekday(), 0, -1)
        stamp = time.mktime(tt)
        tt = time.localtime(stamp)
        return tt.tm_isdst > 0