from collections.abc import MutableMapping
from typing import (
    TYPE_CHECKING,
    Any,
    Optional,
    Union,
)
from weakref import WeakKeyDictionary

import fastapi
from fastapi._compat import (
    BaseConfig,
    ModelField,
    PydanticSchemaGenerationError,
    Undefined,
    UndefinedType,
    Validator,
    annotation_is_pydantic_v1,
)
from fastapi.datastructures import DefaultPlaceholder, DefaultType

)
from .shared import lenient_issubclass as lenient_issubclass
from .shared import sequence_types as sequence_types
from .shared import value_is_sequence as value_is_sequence
from .v2 import BaseConfig as BaseConfig
from .v2 import ModelField as ModelField
from .v2 import PydanticSchemaGenerationError as PydanticSchemaGenerationError
from .v2 import RequiredParam as RequiredParam
from .v2 import Undefined as Undefined

            attributes[attr] = value
    return {
        "annotation": field_info.annotation,
        "metadata": field_info.metadata,
        "attributes": attributes,
    }


class BaseConfig:
    pass


class ErrorWrapper(Exception):
    pass


@dataclass
class ModelField:
    field_info: FieldInfo
    name: str
    mode: Literal["validation", "serialization"] = "validation"