from __future__ import annotations

from os import PathLike
from abc import ABC, abstractmethod
from typing import (
    IO,
    TYPE_CHECKING,
    Any,
    Dict,
    List,
    Type,
    Tuple,
    Union,
    Mapping,
    TypeVar,
    Callable,
    Iterator,
    Optional,
    Sequence,
    AsyncIterator,
)
from typing_extensions import (
    Literal,
    Protocol,
    TypeAlias,
    TypedDict,
    override,
    runtime_checkable,
)

import pydantic
from httpx import URL, Proxy, Timeout, Response, BaseTransport, AsyncBaseTransport

if TYPE_CHECKING:
    from ._models import BaseModel

Transport = BaseTransport
AsyncTransport = AsyncBaseTransport
Query = Mapping[str, object]
Body = object
AnyMapping = Mapping[str, object]
ModelT = TypeVar("ModelT", bound=pydantic.BaseModel)
_T = TypeVar("_T")


class BinaryResponseContent(ABC):
    def __init__(
        self,
        response: Any,
    ) -> None:
        ...

    @property
    @abstractmethod
    def content(self) -> bytes:
        pass

    @property
    @abstractmethod
    def text(self) -> str:
        pass

    @property
    @abstractmethod
    def encoding(self) -> Optional[str]:
        """
        Return an encoding to use for decoding the byte content into text.
        The priority for determining this is given by...

        * `.encoding = <>` has been set explicitly.
        * The encoding as specified by the charset parameter in the Content-Type header.
        * The encoding as determined by `default_encoding`, which may either be
          a string like "utf-8" indicating the encoding to use, or may be a callable
          which enables charset autodetection.
        """
        pass

    @property
    @abstractmethod
    def charset_encoding(self) -> Optional[str]:
        """
        Return the encoding, as specified by the Content-Type header.
        """
        pass

    @abstractmethod
    def json(self, **kwargs: Any) -> Any:
        pass

    @abstractmethod
    def read(self) -> bytes:
        """
        Read and return the response content.
        """
        pass

    @abstractmethod
    def iter_bytes(self, chunk_size: Optional[int] = None) -> Iterator[bytes]:
        """
        A byte-iterator over the decoded response content.
        This allows us to handle gzip, deflate, and brotli encoded responses.
        """
        pass

    @abstractmethod
    def iter_text(self, chunk_size: Optional[int] = None) -> Iterator[str]:
        """
        A str-iterator over the decoded response content
        that handles both gzip, deflate, etc but also detects the content's
        string encoding.
        """
        pass

    @abstractmethod
    def iter_lines(self) -> Iterator[str]:
        pass

    @abstractmethod
    def iter_raw(self, chunk_size: Optional[int] = None) -> Iterator[bytes]:
        """
        A byte-iterator over the raw response content.
        """
        pass

    @abstractmethod
    def stream_to_file(
        self,
        file: str | PathLike[str],
        *,
        chunk_size: int | None = None,
    ) -> None:
        """
        Stream the output to the given file.
        """
        pass

    @abstractmethod
    def close(self) -> None:
        """
        Close the response and release the connection.
        Automatically called if the response body is read to completion.
        """
        pass

    @abstractmethod
    async def aread(self) -> bytes:
        """
        Read and return the response content.
        """
        pass

    @abstractmethod
    async def aiter_bytes(self, chunk_size: Optional[int] = None) -> AsyncIterator[bytes]:
        """
        A byte-iterator over the decoded response content.
        This allows us to handle gzip, deflate, and brotli encoded responses.
        """
        pass

    @abstractmethod
    async def aiter_text(self, chunk_size: Optional[int] = None) -> AsyncIterator[str]:
        """
        A str-iterator over the decoded response content
        that handles both gzip, deflate, etc but also detects the content's
        string encoding.
        """
        pass

    @abstractmethod
    async def aiter_lines(self) -> AsyncIterator[str]:
        pass

    @abstractmethod
    async def aiter_raw(self, chunk_size: Optional[int] = None) -> AsyncIterator[bytes]:
        """
        A byte-iterator over the raw response content.
        """
        pass

    @abstractmethod
    async def astream_to_file(
        self,
        file: str | PathLike[str],
        *,
        chunk_size: int | None = None,
    ) -> None:
        """
        Stream the output to the given file.
        """
        pass

    @abstractmethod
    async def aclose(self) -> None:
        """
        Close the response and release the connection.
        Automatically called if the response body is read to completion.
        """
        pass


# Approximates httpx internal ProxiesTypes and RequestFiles types
# while adding support for `PathLike` instances
ProxiesDict = Dict["str | URL", Union[None, str, URL, Proxy]]
ProxiesTypes = Union[str, Proxy, ProxiesDict]
if TYPE_CHECKING:
    FileContent = Union[IO[bytes], bytes, PathLike[str]]
else:
    FileContent = Union[IO[bytes], bytes, PathLike]  # PathLike is not subscriptable in Python 3.8.
FileTypes = Union[
    # file (or bytes)
    FileContent,
    # (filename, file (or bytes))
    Tuple[Optional[str], FileContent],
    # (filename, file (or bytes), content_type)
    Tuple[Optional[str], FileContent, Optional[str]],
    # (filename, file (or bytes), content_type, headers)
    Tuple[Optional[str], FileContent, Optional[str], Mapping[str, str]],
]
RequestFiles = Union[Mapping[str, FileTypes], Sequence[Tuple[str, FileTypes]]]

# duplicate of the above but without our custom file support
HttpxFileContent = Union[IO[bytes], bytes]
HttpxFileTypes = Union[
    # file (or bytes)
    HttpxFileContent,
    # (filename, file (or bytes))
    Tuple[Optional[str], HttpxFileContent],
    # (filename, file (or bytes), content_type)
    Tuple[Optional[str], HttpxFileContent, Optional[str]],
    # (filename, file (or bytes), content_type, headers)
    Tuple[Optional[str], HttpxFileContent, Optional[str], Mapping[str, str]],
]
HttpxRequestFiles = Union[Mapping[str, HttpxFileTypes], Sequence[Tuple[str, HttpxFileTypes]]]

# Workaround to support (cast_to: Type[ResponseT]) -> ResponseT
# where ResponseT includes `None`. In order to support directly
# passing `None`, overloads would have to be defined for every
# method that uses `ResponseT` which would lead to an unacceptable
# amount of code duplication and make it unreadable. See _base_client.py
# for example usage.
#
# This unfortunately means that you will either have
# to import this type and pass it explicitly:
#
# from openai import NoneType
# client.get('/foo', cast_to=NoneType)
#
# or build it yourself:
#
# client.get('/foo', cast_to=type(None))
if TYPE_CHECKING:
    NoneType: Type[None]
else:
    NoneType = type(None)


class RequestOptions(TypedDict, total=False):
    headers: Headers
    max_retries: int
    timeout: float | Timeout | None
    params: Query
    extra_json: AnyMapping
    idempotency_key: str


# Sentinel class used when the response type is an object with an unknown schema
class UnknownResponse:
    ...


# Sentinel class used until PEP 0661 is accepted
class NotGiven:
    """
    A sentinel singleton class used to distinguish omitted keyword arguments
    from those passed in with the value None (which may have different behavior).

    For example:

    ```py
    def get(timeout: Union[int, NotGiven, None] = NotGiven()) -> Response: ...

    get(timeout=1) # 1s timeout
    get(timeout=None) # No timeout
    get() # Default timeout behavior, which may not be statically known at the method definition.
    ```
    """

    def __bool__(self) -> Literal[False]:
        return False

    @override
    def __repr__(self) -> str:
        return "NOT_GIVEN"


NotGivenOr = Union[_T, NotGiven]
NOT_GIVEN = NotGiven()


class Omit:
    """In certain situations you need to be able to represent a case where a default value has
    to be explicitly removed and `None` is not an appropriate substitute, for example:

    ```py
    # as the default `Content-Type` header is `application/json` that will be sent
    client.post('/upload/files', files={'file': b'my raw file content'})

    # you can't explicitly override the header as it has to be dynamically generated
    # to look something like: 'multipart/form-data; boundary=0d8382fcf5f8c3be01ca2e11002d2983'
    client.post(..., headers={'Content-Type': 'multipart/form-data'})

    # instead you can remove the default `application/json` header by passing Omit
    client.post(..., headers={'Content-Type': Omit()})
    ```
    """

    def __bool__(self) -> Literal[False]:
        return False


@runtime_checkable
class ModelBuilderProtocol(Protocol):
    @classmethod
    def build(
        cls: type[_T],
        *,
        response: Response,
        data: object,
    ) -> _T:
        ...


Headers = Mapping[str, Union[str, Omit]]


class HeadersLikeProtocol(Protocol):
    def get(self, __key: str) -> str | None:
        ...


HeadersLike = Union[Headers, HeadersLikeProtocol]

ResponseT = TypeVar(
    "ResponseT",
    bound="Union[str, None, BaseModel, List[Any], Dict[str, Any], Response, UnknownResponse, ModelBuilderProtocol, BinaryResponseContent]",
)

StrBytesIntFloat = Union[str, bytes, int, float]

# Note: copied from Pydantic
# https://github.com/pydantic/pydantic/blob/32ea570bf96e84234d2992e1ddf40ab8a565925a/pydantic/main.py#L49
IncEx: TypeAlias = "set[int] | set[str] | dict[int, Any] | dict[str, Any] | None"

PostParser = Callable[[Any], Any]
