from typing import TypeVar, Callable, Optional, List, Dict, Union, Tuple, Any, Iterable
from django.http import HttpResponse

ViewFuncT = TypeVar('ViewFuncT', bound=Callable[..., HttpResponse])

# See zerver/lib/validator.py for more details of Validators,
# including many examples
Validator = Callable[[str, object], Optional[str]]

# This type is specific for zerver.lib.actions.extract_recipients. After
# deciding to support IDs for some of our API, extract_recipients'
# implementation diverged from other converter functions in many ways.
# See zerver/lib/request.pyi to see how this is used.
ExtractRecipients = Callable[[Union[str, Iterable[str], Iterable[int]]], Union[List[str], List[int]]]
ExtendedValidator = Callable[[str, str, object], Optional[str]]
RealmUserValidator = Callable[[int, List[int], bool], Optional[str]]

ProfileDataElement = Dict[str, Union[int, float, Optional[str]]]
ProfileData = List[ProfileDataElement]

FieldElement = Tuple[int, str, Validator, Callable[[Any], Any], str]
ExtendedFieldElement = Tuple[int, str, ExtendedValidator, Callable[[Any], Any], str]
UserFieldElement = Tuple[int, str, RealmUserValidator, Callable[[Any], Any], str]

ProfileFieldData = Dict[str, Union[Dict[str, str], str]]