# -*- coding: utf-8 -*-
import sys

from . import _tzpath
from ._tzpath import reset_tzpath
from .tz import *
from .tz import __doc__

__all__ = [
    "tzutc",
    "tzoffset",
    "tzlocal",
    "tzfile",
    "tzrange",
    "tzstr",
    "tzical",
    "tzwin",
    "tzwinlocal",
    "gettz",
    "enfold",
    "datetime_ambiguous",
    "datetime_exists",
    "resolve_imaginary",
    "available_iana_timezones",
    "UTC",
    "TZPATH",
    "reset_tzpath",
    "DeprecatedTzFormatWarning",
    "DeprecatedTzKeyWarning",
]

if sys.version_info < (3, 7):
    # Module-level __getattr__ was added in Python 3.7, so instead of lazily
    # populating TZPATH on every access, we will register a callback with
    # reset_tzpath to update the top-level tuple.
    TZPATH = _tzpath.TZPATH

    def _tzpath_callback(new_tzpath):
        global TZPATH
        TZPATH = new_tzpath

    _tzpath.TZPATH_CALLBACKS.append(_tzpath_callback)

else:

    def __getattr__(name):
        if name == "TZPATH":
            return _tzpath.TZPATH
        else:
            raise AttributeError(
                "Module %s has no attribute %s" % (repr(__name__), repr(name))
            )


def __dir__():
    return sorted(list(globals()) + ["TZPATH"])


class DeprecatedTzFormatWarning(Warning):
    """Warning raised when time zones are parsed from deprecated formats."""