from dataclasses import MISSING
from inspect import Signature
from typing import Any, Final

from msgspec import UnsetType

from litestar.enums import MediaType
from litestar.types import Empty
from litestar.utils.deprecation import warn_deprecation

DEFAULT_ALLOWED_CORS_HEADERS: Final = {"Accept", "Accept-Language", "Content-Language", "Content-Type"}
DEFAULT_CHUNK_SIZE: Final = 1024 * 128  # 128KB
HTTP_DISCONNECT: Final = "http.disconnect"
HTTP_RESPONSE_BODY: Final = "http.response.body"
HTTP_RESPONSE_START: Final = "http.response.start"
ONE_MEGABYTE: Final = 1024 * 1024
OPENAPI_NOT_INITIALIZED: Final = "Litestar has not been instantiated with OpenAPIConfig"
REDIRECT_STATUS_CODES: Final = {301, 302, 303, 307, 308}
REDIRECT_ALLOWED_MEDIA_TYPES: Final = {MediaType.TEXT, MediaType.HTML, MediaType.JSON}
RESERVED_KWARGS: Final = {"state", "headers", "cookies", "request", "socket", "data", "query", "scope", "body"}
SKIP_VALIDATION_NAMES: Final = {"request", "socket", "scope", "receive", "send"}
UNDEFINED_SENTINELS: Final = {Signature.empty, Empty, Ellipsis, MISSING, UnsetType}
WEBSOCKET_CLOSE: Final = "websocket.close"
WEBSOCKET_DISCONNECT: Final = "websocket.disconnect"


# deprecated constants
_SCOPE_STATE_CSRF_TOKEN_KEY = "csrf_token"  # noqa: S105  # possible hardcoded password
_SCOPE_STATE_DEPENDENCY_CACHE: Final = "dependency_cache"
_SCOPE_STATE_NAMESPACE: Final = "__litestar__"
_SCOPE_STATE_RESPONSE_COMPRESSED: Final = "response_compressed"
_SCOPE_STATE_DO_CACHE: Final = "do_cache"
_SCOPE_STATE_IS_CACHED: Final = "is_cached"

_deprecated_names = {
    "SCOPE_STATE_CSRF_TOKEN_KEY": _SCOPE_STATE_CSRF_TOKEN_KEY,
    "SCOPE_STATE_DEPENDENCY_CACHE": _SCOPE_STATE_DEPENDENCY_CACHE,
    "SCOPE_STATE_NAMESPACE": _SCOPE_STATE_NAMESPACE,
    "SCOPE_STATE_RESPONSE_COMPRESSED": _SCOPE_STATE_RESPONSE_COMPRESSED,
    "SCOPE_STATE_DO_CACHE": _SCOPE_STATE_DO_CACHE,
    "SCOPE_STATE_IS_CACHED": _SCOPE_STATE_IS_CACHED,
}


def __getattr__(name: str) -> Any:
    if name in _deprecated_names:
        warn_deprecation(
            deprecated_name=f"litestar.constants.{name}",
            version="2.4",
            kind="import",
            removal_in="3.0",
            info=f"'{name}' from 'litestar.constants' is deprecated and will be removed in 3.0. "
            "Direct access to Litestar scope state is not recommended.",
        )

        return globals()["_deprecated_names"][name]
    raise AttributeError(f"module {__name__} has no attribute {name}")  # pragma: no cover