from __future__ import annotations

import contextlib
import inspect
import io
import json
import math
import queue
import sys
import typing
import warnings
from concurrent.futures import Future
from functools import cached_property
from types import GeneratorType
from urllib.parse import unquote, urljoin

import anyio
import anyio.abc
import anyio.from_thread
from anyio.abc import ObjectReceiveStream, ObjectSendStream
from anyio.streams.stapled import StapledObjectStream

from starlette._utils import is_async_callable
from starlette.types import ASGIApp, Message, Receive, Scope, Send
from starlette.websockets import WebSocketDisconnect

if sys.version_info >= (3, 10):  # pragma: no cover
    from typing import TypeGuard
else:  # pragma: no cover
    from typing_extensions import TypeGuard

try:
    import httpx
except ModuleNotFoundError:  # pragma: no cover
    raise RuntimeError(
        "The starlette.testclient module requires the httpx package to be installed.\n"
        "You can install this with:\n"
        "    $ pip install httpx\n"
    )
_PortalFactoryType = typing.Callable[[], typing.ContextManager[anyio.abc.BlockingPortal]]

ASGIInstance = typing.Callable[[Receive, Send], typing.Awaitable[None]]
ASGI2App = typing.Callable[[Scope], ASGIInstance]
ASGI3App = typing.Callable[[Scope, Receive, Send], typing.Awaitable[None]]


_RequestData = typing.Mapping[str, typing.Union[str, typing.Iterable[str], bytes]]


def _is_asgi3(app: ASGI2App | ASGI3App) -> TypeGuard[ASGI3App]:
    if inspect.isclass(app):
        return hasattr(app, "__await__")
    return is_async_callable(app)


class _WrapASGI2:
    """
    Provide an ASGI3 interface onto an ASGI2 app.
    """

    def __init__(self, app: ASGI2App) -> None:
        self.app = app

    async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
        instance = self.app(scope)
        await instance(receive, send)


class _AsyncBackend(typing.TypedDict):
    backend: str
    backend_options: dict[str, typing.Any]


class _Upgrade(Exception):
    def __init__(self, session: WebSocketTestSession) -> None:
        self.session = session


class WebSocketDenialResponse(  # type: ignore[misc]
    httpx.Response,
    WebSocketDisconnect,
):
    """
    A special case of `WebSocketDisconnect`, raised in the `TestClient` if the
    `WebSocket` is closed before being accepted with a `send_denial_response()`.
    """


class WebSocketTestSession:
    def __init__(
        self,
        app: ASGI3App,
        scope: Scope,
        portal_factory: _PortalFactoryType,
    ) -> None:
        self.app = app
        self.scope = scope
        self.accepted_subprotocol = None
        self.portal_factory = portal_factory
        self._receive_queue: queue.Queue[Message] = queue.Queue()
        self._send_queue: queue.Queue[Message | BaseException] = queue.Queue()
        self.extra_headers = None

    def __enter__(self) -> WebSocketTestSession:
        self.exit_stack = contextlib.ExitStack()
        self.portal = self.exit_stack.enter_context(self.portal_factory())

        try:
            _: Future[None] = self.portal.start_task_soon(self._run)
            self.send({"type": "websocket.connect"})
            message = self.receive()
            self._raise_on_close(message)
        except Exception:
            self.exit_stack.close()
            raise
        self.accepted_subprotocol = message.get("subprotocol", None)
        self.extra_headers = message.get("headers", None)
        return self

    @cached_property
    def should_close(self) -> anyio.Event:
        return anyio.Event()

    async def _notify_close(self) -> None:
        self.should_close.set()

    def __exit__(self, *args: typing.Any) -> None:
        try:
            self.close(1000)
        finally:
            self.portal.start_task_soon(self._notify_close)
            self.exit_stack.close()
        while not self._send_queue.empty():
            message = self._send_queue.get()
            if isinstance(message, BaseException):
                raise message

    async def _run(self) -> None:
        """
        The sub-thread in which the websocket session runs.
        """

        async def run_app(tg: anyio.abc.TaskGroup) -> None:
            try:
                await self.app(self.scope, self._asgi_receive, self._asgi_send)
            except anyio.get_cancelled_exc_class():
                ...
            except BaseException as exc:
                self._send_queue.put(exc)
                raise
            finally:
                tg.cancel_scope.cancel()

        async with anyio.create_task_group() as tg:
            tg.start_soon(run_app, tg)
            await self.should_close.wait()
            tg.cancel_scope.cancel()

    async def _asgi_receive(self) -> Message:
        while self._receive_queue.empty():
            self._queue_event = anyio.Event()
            await self._queue_event.wait()
        return self._receive_queue.get()

    async def _asgi_send(self, message: Message) -> None:
        self._send_queue.put(message)

    def _raise_on_close(self, message: Message) -> None:
        if message["type"] == "websocket.close":
            raise WebSocketDisconnect(code=message.get("code", 1000), reason=message.get("reason", ""))
        elif message["type"] == "websocket.http.response.start":
            status_code: int = message["status"]
            headers: list[tuple[bytes, bytes]] = message["headers"]
            body: list[bytes] = []
            while True:
                message = self.receive()
                assert message["type"] == "websocket.http.response.body"
                body.append(message["body"])
                if not message.get("more_body", False):
                    break
            raise WebSocketDenialResponse(status_code=status_code, headers=headers, content=b"".join(body))

    def send(self, message: Message) -> None:
        self._receive_queue.put(message)
        if hasattr(self, "_queue_event"):
            self.portal.start_task_soon(self._queue_event.set)

    def send_text(self, data: str) -> None:
        self.send({"type": "websocket.receive", "text": data})

    def send_bytes(self, data: bytes) -> None:
        self.send({"type": "websocket.receive", "bytes": data})

    def send_json(self, data: typing.Any, mode: typing.Literal["text", "binary"] = "text") -> None:
        text = json.dumps(data, separators=(",", ":"), ensure_ascii=False)
        if mode == "text":
            self.send({"type": "websocket.receive", "text": text})
        else:
            self.send({"type": "websocket.receive", "bytes": text.encode("utf-8")})

    def close(self, code: int = 1000, reason: str | None = None) -> None:
        self.send({"type": "websocket.disconnect", "code": code, "reason": reason})

    def receive(self) -> Message:
        message = self._send_queue.get()
        if isinstance(message, BaseException):
            raise message
        return message

    def receive_text(self) -> str:
        message = self.receive()
        self._raise_on_close(message)
        return typing.cast(str, message["text"])

    def receive_bytes(self) -> bytes:
        message = self.receive()
        self._raise_on_close(message)
        return typing.cast(bytes, message["bytes"])

    def receive_json(self, mode: typing.Literal["text", "binary"] = "text") -> typing.Any:
        message = self.receive()
        self._raise_on_close(message)
        if mode == "text":
            text = message["text"]
        else:
            text = message["bytes"].decode("utf-8")
        return json.loads(text)


class _TestClientTransport(httpx.BaseTransport):
    def __init__(
        self,
        app: ASGI3App,
        portal_factory: _PortalFactoryType,
        raise_server_exceptions: bool = True,
        root_path: str = "",
        *,
        app_state: dict[str, typing.Any],
    ) -> None:
        self.app = app
        self.raise_server_exceptions = raise_server_exceptions
        self.root_path = root_path
        self.portal_factory = portal_factory
        self.app_state = app_state

    def handle_request(self, request: httpx.Request) -> httpx.Response:
        scheme = request.url.scheme
        netloc = request.url.netloc.decode(encoding="ascii")
        path = request.url.path
        raw_path = request.url.raw_path
        query = request.url.query.decode(encoding="ascii")

        default_port = {"http": 80, "ws": 80, "https": 443, "wss": 443}[scheme]

        if ":" in netloc:
            host, port_string = netloc.split(":", 1)
            port = int(port_string)
        else:
            host = netloc
            port = default_port

        # Include the 'host' header.
        if "host" in request.headers:
            headers: list[tuple[bytes, bytes]] = []
        elif port == default_port:  # pragma: no cover
            headers = [(b"host", host.encode())]
        else:  # pragma: no cover
            headers = [(b"host", (f"{host}:{port}").encode())]

        # Include other request headers.
        headers += [(key.lower().encode(), value.encode()) for key, value in request.headers.multi_items()]

        scope: dict[str, typing.Any]

        if scheme in {"ws", "wss"}:
            subprotocol = request.headers.get("sec-websocket-protocol", None)
            if subprotocol is None:
                subprotocols: typing.Sequence[str] = []
            else:
                subprotocols = [value.strip() for value in subprotocol.split(",")]
            scope = {
                "type": "websocket",
                "path": unquote(path),
                "raw_path": raw_path,
                "root_path": self.root_path,
                "scheme": scheme,
                "query_string": query.encode(),
                "headers": headers,
                "client": ["testclient", 50000],
                "server": [host, port],
                "subprotocols": subprotocols,
                "state": self.app_state.copy(),
                "extensions": {"websocket.http.response": {}},
            }
            session = WebSocketTestSession(self.app, scope, self.portal_factory)
            raise _Upgrade(session)

        scope = {
            "type": "http",
            "http_version": "1.1",
            "method": request.method,
            "path": unquote(path),
            "raw_path": raw_path,
            "root_path": self.root_path,
            "scheme": scheme,
            "query_string": query.encode(),
            "headers": headers,
            "client": ["testclient", 50000],
            "server": [host, port],
            "extensions": {"http.response.debug": {}},
            "state": self.app_state.copy(),
        }

        request_complete = False
        response_started = False
        response_complete: anyio.Event
        raw_kwargs: dict[str, typing.Any] = {"stream": io.BytesIO()}
        template = None
        context = None

        async def receive() -> Message:
            nonlocal request_complete

            if request_complete:
                if not response_complete.is_set():
                    await response_complete.wait()
                return {"type": "http.disconnect"}

            body = request.read()
            if isinstance(body, str):
                body_bytes: bytes = body.encode("utf-8")  # pragma: no cover
            elif body is None:
                body_bytes = b""  # pragma: no cover
            elif isinstance(body, GeneratorType):
                try:  # pragma: no cover
                    chunk = body.send(None)
                    if isinstance(chunk, str):
                        chunk = chunk.encode("utf-8")
                    return {"type": "http.request", "body": chunk, "more_body": True}
                except StopIteration:  # pragma: no cover
                    request_complete = True
                    return {"type": "http.request", "body": b""}
            else:
                body_bytes = body

            request_complete = True
            return {"type": "http.request", "body": body_bytes}

        async def send(message: Message) -> None:
            nonlocal raw_kwargs, response_started, template, context

            if message["type"] == "http.response.start":
                assert not response_started, 'Received multiple "http.response.start" messages.'
                raw_kwargs["status_code"] = message["status"]
                raw_kwargs["headers"] = [(key.decode(), value.decode()) for key, value in message.get("headers", [])]
                response_started = True
            elif message["type"] == "http.response.body":
                assert response_started, 'Received "http.response.body" without "http.response.start".'
                assert not response_complete.is_set(), 'Received "http.response.body" after response completed.'
                body = message.get("body", b"")
                more_body = message.get("more_body", False)
                if request.method != "HEAD":
                    raw_kwargs["stream"].write(body)
                if not more_body:
                    raw_kwargs["stream"].seek(0)
                    response_complete.set()
            elif message["type"] == "http.response.debug":
                template = message["info"]["template"]
                context = message["info"]["context"]

        try:
            with self.portal_factory() as portal:
                response_complete = portal.call(anyio.Event)
                portal.call(self.app, scope, receive, send)
        except BaseException as exc:
            if self.raise_server_exceptions:
                raise exc

        if self.raise_server_exceptions:
            assert response_started, "TestClient did not receive any response."
        elif not response_started:
            raw_kwargs = {
                "status_code": 500,
                "headers": [],
                "stream": io.BytesIO(),
            }

        raw_kwargs["stream"] = httpx.ByteStream(raw_kwargs["stream"].read())

        response = httpx.Response(**raw_kwargs, request=request)
        if template is not None:
            response.template = template  # type: ignore[attr-defined]
            response.context = context  # type: ignore[attr-defined]
        return response


class TestClient(httpx.Client):
    __test__ = False
    task: Future[None]
    portal: anyio.abc.BlockingPortal | None = None

    def __init__(
        self,
        app: ASGIApp,
        base_url: str = "http://testserver",
        raise_server_exceptions: bool = True,
        root_path: str = "",
        backend: typing.Literal["asyncio", "trio"] = "asyncio",
        backend_options: dict[str, typing.Any] | None = None,
        cookies: httpx._types.CookieTypes | None = None,
        headers: dict[str, str] | None = None,
        follow_redirects: bool = True,
    ) -> None:
        self.async_backend = _AsyncBackend(backend=backend, backend_options=backend_options or {})
        if _is_asgi3(app):
            asgi_app = app
        else:
            app = typing.cast(ASGI2App, app)  # type: ignore[assignment]
            asgi_app = _WrapASGI2(app)  # type: ignore[arg-type]
        self.app = asgi_app
        self.app_state: dict[str, typing.Any] = {}
        transport = _TestClientTransport(
            self.app,
            portal_factory=self._portal_factory,
            raise_server_exceptions=raise_server_exceptions,
            root_path=root_path,
            app_state=self.app_state,
        )
        if headers is None:
            headers = {}
        headers.setdefault("user-agent", "testclient")
        super().__init__(
            base_url=base_url,
            headers=headers,
            transport=transport,
            follow_redirects=follow_redirects,
            cookies=cookies,
        )

    @contextlib.contextmanager
    def _portal_factory(self) -> typing.Generator[anyio.abc.BlockingPortal, None, None]:
        if self.portal is not None:
            yield self.portal
        else:
            with anyio.from_thread.start_blocking_portal(**self.async_backend) as portal:
                yield portal

    def _choose_redirect_arg(
        self, follow_redirects: bool | None, allow_redirects: bool | None
    ) -> bool | httpx._client.UseClientDefault:
        redirect: bool | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT
        if allow_redirects is not None:
            message = "The `allow_redirects` argument is deprecated. Use `follow_redirects` instead."
            warnings.warn(message, DeprecationWarning)
            redirect = allow_redirects
        if follow_redirects is not None:
            redirect = follow_redirects
        elif allow_redirects is not None and follow_redirects is not None:
            raise RuntimeError(  # pragma: no cover
                "Cannot use both `allow_redirects` and `follow_redirects`."
            )
        return redirect

    def request(  # type: ignore[override]
        self,
        method: str,
        url: httpx._types.URLTypes,
        *,
        content: httpx._types.RequestContent | None = None,
        data: _RequestData | None = None,
        files: httpx._types.RequestFiles | None = None,
        json: typing.Any = None,
        params: httpx._types.QueryParamTypes | None = None,
        headers: httpx._types.HeaderTypes | None = None,
        cookies: httpx._types.CookieTypes | None = None,
        auth: httpx._types.AuthTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        follow_redirects: bool | None = None,
        allow_redirects: bool | None = None,
        timeout: httpx._types.TimeoutTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        extensions: dict[str, typing.Any] | None = None,
    ) -> httpx.Response:
        url = self._merge_url(url)
        redirect = self._choose_redirect_arg(follow_redirects, allow_redirects)
        return super().request(
            method,
            url,
            content=content,
            data=data,
            files=files,
            json=json,
            params=params,
            headers=headers,
            cookies=cookies,
            auth=auth,
            follow_redirects=redirect,
            timeout=timeout,
            extensions=extensions,
        )

    def get(  # type: ignore[override]
        self,
        url: httpx._types.URLTypes,
        *,
        params: httpx._types.QueryParamTypes | None = None,
        headers: httpx._types.HeaderTypes | None = None,
        cookies: httpx._types.CookieTypes | None = None,
        auth: httpx._types.AuthTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        follow_redirects: bool | None = None,
        allow_redirects: bool | None = None,
        timeout: httpx._types.TimeoutTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        extensions: dict[str, typing.Any] | None = None,
    ) -> httpx.Response:
        redirect = self._choose_redirect_arg(follow_redirects, allow_redirects)
        return super().get(
            url,
            params=params,
            headers=headers,
            cookies=cookies,
            auth=auth,
            follow_redirects=redirect,
            timeout=timeout,
            extensions=extensions,
        )

    def options(  # type: ignore[override]
        self,
        url: httpx._types.URLTypes,
        *,
        params: httpx._types.QueryParamTypes | None = None,
        headers: httpx._types.HeaderTypes | None = None,
        cookies: httpx._types.CookieTypes | None = None,
        auth: httpx._types.AuthTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        follow_redirects: bool | None = None,
        allow_redirects: bool | None = None,
        timeout: httpx._types.TimeoutTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        extensions: dict[str, typing.Any] | None = None,
    ) -> httpx.Response:
        redirect = self._choose_redirect_arg(follow_redirects, allow_redirects)
        return super().options(
            url,
            params=params,
            headers=headers,
            cookies=cookies,
            auth=auth,
            follow_redirects=redirect,
            timeout=timeout,
            extensions=extensions,
        )

    def head(  # type: ignore[override]
        self,
        url: httpx._types.URLTypes,
        *,
        params: httpx._types.QueryParamTypes | None = None,
        headers: httpx._types.HeaderTypes | None = None,
        cookies: httpx._types.CookieTypes | None = None,
        auth: httpx._types.AuthTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        follow_redirects: bool | None = None,
        allow_redirects: bool | None = None,
        timeout: httpx._types.TimeoutTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        extensions: dict[str, typing.Any] | None = None,
    ) -> httpx.Response:
        redirect = self._choose_redirect_arg(follow_redirects, allow_redirects)
        return super().head(
            url,
            params=params,
            headers=headers,
            cookies=cookies,
            auth=auth,
            follow_redirects=redirect,
            timeout=timeout,
            extensions=extensions,
        )

    def post(  # type: ignore[override]
        self,
        url: httpx._types.URLTypes,
        *,
        content: httpx._types.RequestContent | None = None,
        data: _RequestData | None = None,
        files: httpx._types.RequestFiles | None = None,
        json: typing.Any = None,
        params: httpx._types.QueryParamTypes | None = None,
        headers: httpx._types.HeaderTypes | None = None,
        cookies: httpx._types.CookieTypes | None = None,
        auth: httpx._types.AuthTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        follow_redirects: bool | None = None,
        allow_redirects: bool | None = None,
        timeout: httpx._types.TimeoutTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        extensions: dict[str, typing.Any] | None = None,
    ) -> httpx.Response:
        redirect = self._choose_redirect_arg(follow_redirects, allow_redirects)
        return super().post(
            url,
            content=content,
            data=data,
            files=files,
            json=json,
            params=params,
            headers=headers,
            cookies=cookies,
            auth=auth,
            follow_redirects=redirect,
            timeout=timeout,
            extensions=extensions,
        )

    def put(  # type: ignore[override]
        self,
        url: httpx._types.URLTypes,
        *,
        content: httpx._types.RequestContent | None = None,
        data: _RequestData | None = None,
        files: httpx._types.RequestFiles | None = None,
        json: typing.Any = None,
        params: httpx._types.QueryParamTypes | None = None,
        headers: httpx._types.HeaderTypes | None = None,
        cookies: httpx._types.CookieTypes | None = None,
        auth: httpx._types.AuthTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        follow_redirects: bool | None = None,
        allow_redirects: bool | None = None,
        timeout: httpx._types.TimeoutTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        extensions: dict[str, typing.Any] | None = None,
    ) -> httpx.Response:
        redirect = self._choose_redirect_arg(follow_redirects, allow_redirects)
        return super().put(
            url,
            content=content,
            data=data,
            files=files,
            json=json,
            params=params,
            headers=headers,
            cookies=cookies,
            auth=auth,
            follow_redirects=redirect,
            timeout=timeout,
            extensions=extensions,
        )

    def patch(  # type: ignore[override]
        self,
        url: httpx._types.URLTypes,
        *,
        content: httpx._types.RequestContent | None = None,
        data: _RequestData | None = None,
        files: httpx._types.RequestFiles | None = None,
        json: typing.Any = None,
        params: httpx._types.QueryParamTypes | None = None,
        headers: httpx._types.HeaderTypes | None = None,
        cookies: httpx._types.CookieTypes | None = None,
        auth: httpx._types.AuthTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        follow_redirects: bool | None = None,
        allow_redirects: bool | None = None,
        timeout: httpx._types.TimeoutTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        extensions: dict[str, typing.Any] | None = None,
    ) -> httpx.Response:
        redirect = self._choose_redirect_arg(follow_redirects, allow_redirects)
        return super().patch(
            url,
            content=content,
            data=data,
            files=files,
            json=json,
            params=params,
            headers=headers,
            cookies=cookies,
            auth=auth,
            follow_redirects=redirect,
            timeout=timeout,
            extensions=extensions,
        )

    def delete(  # type: ignore[override]
        self,
        url: httpx._types.URLTypes,
        *,
        params: httpx._types.QueryParamTypes | None = None,
        headers: httpx._types.HeaderTypes | None = None,
        cookies: httpx._types.CookieTypes | None = None,
        auth: httpx._types.AuthTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        follow_redirects: bool | None = None,
        allow_redirects: bool | None = None,
        timeout: httpx._types.TimeoutTypes | httpx._client.UseClientDefault = httpx._client.USE_CLIENT_DEFAULT,
        extensions: dict[str, typing.Any] | None = None,
    ) -> httpx.Response:
        redirect = self._choose_redirect_arg(follow_redirects, allow_redirects)
        return super().delete(
            url,
            params=params,
            headers=headers,
            cookies=cookies,
            auth=auth,
            follow_redirects=redirect,
            timeout=timeout,
            extensions=extensions,
        )

    def websocket_connect(
        self,
        url: str,
        subprotocols: typing.Sequence[str] | None = None,
        **kwargs: typing.Any,
    ) -> WebSocketTestSession:
        url = urljoin("ws://testserver", url)
        headers = kwargs.get("headers", {})
        headers.setdefault("connection", "upgrade")
        headers.setdefault("sec-websocket-key", "testserver==")
        headers.setdefault("sec-websocket-version", "13")
        if subprotocols is not None:
            headers.setdefault("sec-websocket-protocol", ", ".join(subprotocols))
        kwargs["headers"] = headers
        try:
            super().request("GET", url, **kwargs)
        except _Upgrade as exc:
            session = exc.session
        else:
            raise RuntimeError("Expected WebSocket upgrade")  # pragma: no cover

        return session

    def __enter__(self) -> TestClient:
        with contextlib.ExitStack() as stack:
            self.portal = portal = stack.enter_context(anyio.from_thread.start_blocking_portal(**self.async_backend))

            @stack.callback
            def reset_portal() -> None:
                self.portal = None

            send1: ObjectSendStream[typing.MutableMapping[str, typing.Any] | None]
            receive1: ObjectReceiveStream[typing.MutableMapping[str, typing.Any] | None]
            send2: ObjectSendStream[typing.MutableMapping[str, typing.Any]]
            receive2: ObjectReceiveStream[typing.MutableMapping[str, typing.Any]]
            send1, receive1 = anyio.create_memory_object_stream(math.inf)
            send2, receive2 = anyio.create_memory_object_stream(math.inf)
            self.stream_send = StapledObjectStream(send1, receive1)
            self.stream_receive = StapledObjectStream(send2, receive2)
            self.task = portal.start_task_soon(self.lifespan)
            portal.call(self.wait_startup)

            @stack.callback
            def wait_shutdown() -> None:
                portal.call(self.wait_shutdown)

            self.exit_stack = stack.pop_all()

        return self

    def __exit__(self, *args: typing.Any) -> None:
        self.exit_stack.close()

    async def lifespan(self) -> None:
        scope = {"type": "lifespan", "state": self.app_state}
        try:
            await self.app(scope, self.stream_receive.receive, self.stream_send.send)
        finally:
            await self.stream_send.send(None)

    async def wait_startup(self) -> None:
        await self.stream_receive.send({"type": "lifespan.startup"})

        async def receive() -> typing.Any:
            message = await self.stream_send.receive()
            if message is None:
                self.task.result()
            return message

        message = await receive()
        assert message["type"] in (
            "lifespan.startup.complete",
            "lifespan.startup.failed",
        )
        if message["type"] == "lifespan.startup.failed":
            await receive()

    async def wait_shutdown(self) -> None:
        async def receive() -> typing.Any:
            message = await self.stream_send.receive()
            if message is None:
                self.task.result()
            return message

        async with self.stream_send, self.stream_receive:
            await self.stream_receive.send({"type": "lifespan.shutdown"})
            message = await receive()
            assert message["type"] in (
                "lifespan.shutdown.complete",
                "lifespan.shutdown.failed",
            )
            if message["type"] == "lifespan.shutdown.failed":
                await receive()
