from django.apps.config import AppConfig
from django.db.backends.base.base import BaseDatabaseWrapper
from django.db.backends.sqlite3.base import DatabaseWrapper
from django.db.models.base import Model
from typing import (
    Any,
    Callable,
    Dict,
    List,
)


def load_backend(backend_name: str) -> Any: ...


class ConnectionHandler:
    def __getitem__(self, alias: str) -> BaseDatabaseWrapper: ...
    def __init__(self, databases: Dict[str, Dict[str, str]] = ...) -> None: ...
    def all(self) -> List[DatabaseWrapper]: ...
    def close_all(self) -> None: ...
    @cached_property
    def databases(self) -> Dict[str, Dict[str, str]]: ...
    def ensure_defaults(self, alias: str) -> None: ...
    def prepare_test_settings(self, alias: str) -> None: ...


class ConnectionRouter:
    def __init__(self, routers: None = ...) -> None: ...
    def allow_migrate(self, db: str, app_label: str, **hints) -> bool: ...
    def allow_migrate_model(self, db: str, model: Any) -> bool: ...
    def allow_relation(self, obj1: Model, obj2: Model, **hints) -> bool: ...
    def get_migratable_models(
        self,
        app_config: AppConfig,
        db: str,
        include_auto_created: bool = ...
    ) -> Any: ...
    @cached_property
    def routers(self) -> Any: ...


class DatabaseErrorWrapper:
    def __call__(self, func: Callable) -> Callable: ...
    def __enter__(self) -> None: ...
    def __exit__(self, exc_type: None, exc_value: None, traceback: None) -> None: ...
    def __init__(self, wrapper: DatabaseWrapper) -> None: ...