from collections.abc import Sequence
from copy import copy
from dataclasses import dataclass, is_dataclass
from enum import Enum
from typing import (
    Any,
    Callable,
    Union,
)

from fastapi._compat import shared
from fastapi.openapi.constants import REF_PREFIX as REF_PREFIX
from fastapi.types import ModelNameMap
from pydantic.v1 import BaseConfig as BaseConfig
from pydantic.v1 import BaseModel as BaseModel
from pydantic.v1 import ValidationError as ValidationError
from pydantic.v1 import create_model as create_model
from pydantic.v1.class_validators import Validator as Validator
from pydantic.v1.color import Color as Color
from pydantic.v1.error_wrappers import ErrorWrapper as ErrorWrapper
from pydantic.v1.fields import (
    SHAPE_FROZENSET,
    SHAPE_LIST,
    SHAPE_SEQUENCE,
    SHAPE_SET,
    SHAPE_SINGLETON,
    SHAPE_TUPLE,
    SHAPE_TUPLE_ELLIPSIS,
)
from pydantic.v1.fields import FieldInfo as FieldInfo
from pydantic.v1.fields import ModelField as ModelField
from pydantic.v1.fields import Undefined as Undefined
from pydantic.v1.fields import UndefinedType as UndefinedType
from pydantic.v1.networks import AnyUrl as AnyUrl
from pydantic.v1.networks import NameEmail as NameEmail
from pydantic.v1.schema import TypeModelSet as TypeModelSet
from pydantic.v1.schema import field_schema, model_process_schema
from pydantic.v1.schema import (
    get_annotation_from_field_info as get_annotation_from_field_info,
)
from pydantic.v1.schema import (
    get_flat_models_from_field as get_flat_models_from_field,
)
from pydantic.v1.schema import (
    get_flat_models_from_fields as get_flat_models_from_fields,
)
from pydantic.v1.schema import get_model_name_map as get_model_name_map
from pydantic.v1.types import SecretBytes as SecretBytes
from pydantic.v1.types import SecretStr as SecretStr
from pydantic.v1.typing import evaluate_forwardref as evaluate_forwardref
from pydantic.v1.utils import lenient_issubclass as lenient_issubclass
from pydantic.version import VERSION as PYDANTIC_VERSION
from typing_extensions import Literal

PYDANTIC_VERSION_MINOR_TUPLE = tuple(int(x) for x in PYDANTIC_VERSION.split(".")[:2])
PYDANTIC_V2 = PYDANTIC_VERSION_MINOR_TUPLE[0] == 2
# Keeping old "Required" functionality from Pydantic V1, without
# shadowing typing.Required.
RequiredParam: Any = Ellipsis


GetJsonSchemaHandler = Any
JsonSchemaValue = dict[str, Any]
CoreSchema = Any
Url = AnyUrl

sequence_shapes = {
    SHAPE_LIST,
    SHAPE_SET,
    SHAPE_FROZENSET,
    SHAPE_TUPLE,
    SHAPE_SEQUENCE,
    SHAPE_TUPLE_ELLIPSIS,
}
sequence_shape_to_type = {
    SHAPE_LIST: list,
    SHAPE_SET: set,
    SHAPE_TUPLE: tuple,
    SHAPE_SEQUENCE: list,
    SHAPE_TUPLE_ELLIPSIS: list,
}


@dataclass
class GenerateJsonSchema:
    ref_template: str


class PydanticSchemaGenerationError(Exception):
    pass


RequestErrorModel: type[BaseModel] = create_model("Request")


def with_info_plain_validator_function(
    function: Callable[..., Any],
    *,
    ref: Union[str, None] = None,
    metadata: Any = None,
    serialization: Any = None,
) -> Any:
    return {}


def get_model_definitions(
    *,
    flat_models: set[Union[type[BaseModel], type[Enum]]],
    model_name_map: dict[Union[type[BaseModel], type[Enum]], str],
) -> dict[str, Any]:
    definitions: dict[str, dict[str, Any]] = {}
    for model in flat_models:
        m_schema, m_definitions, m_nested_models = model_process_schema(
            model, model_name_map=model_name_map, ref_prefix=REF_PREFIX
        )
        definitions.update(m_definitions)
        model_name = model_name_map[model]
        definitions[model_name] = m_schema
    for m_schema in definitions.values():
        if "description" in m_schema:
            m_schema["description"] = m_schema["description"].split("\f")[0]
    return definitions


def is_pv1_scalar_field(field: ModelField) -> bool:
    from fastapi import params

    field_info = field.field_info
    if not (
        field.shape == SHAPE_SINGLETON
        and not lenient_issubclass(field.type_, BaseModel)
        and not lenient_issubclass(field.type_, dict)
        and not shared.field_annotation_is_sequence(field.type_)
        and not is_dataclass(field.type_)
        and not isinstance(field_info, params.Body)
    ):
        return False
    if field.sub_fields:
        if not all(is_pv1_scalar_field(f) for f in field.sub_fields):
            return False
    return True


def _model_dump(
    model: BaseModel, mode: Literal["json", "python"] = "json", **kwargs: Any
) -> Any:
    return model.dict(**kwargs)


def _get_model_config(model: BaseModel) -> Any:
    return model.__config__


def get_schema_from_model_field(
    *,
    field: ModelField,
    model_name_map: ModelNameMap,
    field_mapping: dict[
        tuple[ModelField, Literal["validation", "serialization"]], JsonSchemaValue
    ],
    separate_input_output_schemas: bool = True,
) -> dict[str, Any]:
    return field_schema(
        field,
        model_name_map=model_name_map,  # type: ignore[arg-type]
        ref_prefix=REF_PREFIX,
    )[0]


# def get_compat_model_name_map(fields: List[ModelField]) -> ModelNameMap:
#     models = get_flat_models_from_fields(fields, known_models=set())
#     return get_model_name_map(models)  # type: ignore[no-any-return]


def get_definitions(
    *,
    fields: list[ModelField],
    model_name_map: ModelNameMap,
    separate_input_output_schemas: bool = True,
) -> tuple[
    dict[tuple[ModelField, Literal["validation", "serialization"]], JsonSchemaValue],
    dict[str, dict[str, Any]],
]:
    models = get_flat_models_from_fields(fields, known_models=set())
    return {}, get_model_definitions(flat_models=models, model_name_map=model_name_map)  # type: ignore[arg-type]


def is_scalar_field(field: ModelField) -> bool:
    return is_pv1_scalar_field(field)


def is_sequence_field(field: ModelField) -> bool:
    return field.shape in sequence_shapes or shared._annotation_is_sequence(field.type_)


def is_bytes_field(field: ModelField) -> bool:
    return lenient_issubclass(field.type_, bytes)


def is_bytes_sequence_field(field: ModelField) -> bool:
    return field.shape in sequence_shapes and lenient_issubclass(field.type_, bytes)


def copy_field_info(*, field_info: FieldInfo, annotation: Any) -> FieldInfo:
    return copy(field_info)


def serialize_sequence_value(*, field: ModelField, value: Any) -> Sequence[Any]:
    return sequence_shape_to_type[field.shape](value)  # type: ignore[no-any-return]


def create_body_model(
    *, fields: Sequence[ModelField], model_name: str
) -> type[BaseModel]:
    BodyModel = create_model(model_name)
    for f in fields:
        BodyModel.__fields__[f.name] = f
    return BodyModel


def get_model_fields(model: type[BaseModel]) -> list[ModelField]:
    return list(model.__fields__.values())