"""Provide a compatibility layer for requests.auth.HTTPDigestAuth."""
import requests


class _ThreadingDescriptor(object):
    def __init__(self, prop, default):
        self.prop = prop
        self.default = default

    def __get__(self, obj, objtype=None):
        return getattr(obj._thread_local, self.prop, self.default)

    def __set__(self, obj, value):
        setattr(obj._thread_local, self.prop, value)


class _HTTPDigestAuth(requests.auth.HTTPDigestAuth):
    init = _ThreadingDescriptor("init", True)
    last_nonce = _ThreadingDescriptor("last_nonce", "")
    nonce_count = _ThreadingDescriptor("nonce_count", 0)
    chal = _ThreadingDescriptor("chal", {})
    pos = _ThreadingDescriptor("pos", None)
    num_401_calls = _ThreadingDescriptor("num_401_calls", 1)


if requests.__build__ < 0x020800:
    HTTPDigestAuth = requests.auth.HTTPDigestAuth
else:
    HTTPDigestAuth = _HTTPDigestAuth
