import json
import os
import pathlib
import sys
from typing import TYPE_CHECKING, Any, Callable, Iterable, Mapping, Tuple, Union

from multidict import CIMultiDict, CIMultiDictProxy, MultiDict, MultiDictProxy, istr
from yarl import URL

DEFAULT_JSON_ENCODER = json.dumps
DEFAULT_JSON_DECODER = json.loads

if TYPE_CHECKING:  # pragma: no cover
    _CIMultiDict = CIMultiDict[str]
    _CIMultiDictProxy = CIMultiDictProxy[str]
    _MultiDict = MultiDict[str]
    _MultiDictProxy = MultiDictProxy[str]
    from http.cookies import BaseCookie, Morsel
else:
    _CIMultiDict = CIMultiDict
    _CIMultiDictProxy = CIMultiDictProxy
    _MultiDict = MultiDict
    _MultiDictProxy = MultiDictProxy

Byteish = Union[bytes, bytearray, memoryview]
JSONEncoder = Callable[[Any], str]
JSONDecoder = Callable[[str], Any]
LooseHeaders = Union[Mapping[Union[str, istr], str], _CIMultiDict, _CIMultiDictProxy]
RawHeaders = Tuple[Tuple[bytes, bytes], ...]
StrOrURL = Union[str, URL]

LooseCookiesMappings = Mapping[str, Union[str, "BaseCookie[str]", "Morsel[Any]"]]
LooseCookiesIterables = Iterable[
    Tuple[str, Union[str, "BaseCookie[str]", "Morsel[Any]"]]
]
LooseCookies = Union[
    LooseCookiesMappings,
    LooseCookiesIterables,
    "BaseCookie[str]",
]


if sys.version_info >= (3, 6):
    PathLike = Union[str, "os.PathLike[str]"]
else:
    PathLike = Union[str, pathlib.PurePath]