# log_fn.py
import asyncio
from collections.abc import Awaitable, Callable
from functools import wraps
from typing import Any, ParamSpec, TypeVar, overload

P = ParamSpec("P")
R = TypeVar("R")

@overload
def log_fn(fn: Callable[P, Awaitable[R]]) -> Callable[P, Awaitable[R]]: ...
@overload
def log_fn(fn: Callable[P, R]) -> Callable[P, R]: ...
def log_fn(fn: Any) -> Any:
    if asyncio.iscoroutinefunction(fn):
        @wraps(fn)
        async def async_wrapper(*args: Any, **kwargs: Any) -> Any:
            return await fn(*args, **kwargs)
        return async_wrapper
    @wraps(fn)
    def wrapper(*args: Any, **kwargs: Any) -> Any:
        return fn(*args, **kwargs)
    return wrapper

# use_case.py
from dataclasses import dataclass
from injector import inject
from log_fn import log_fn

@dataclass
class Result:
    value: str

@inject
@dataclass
class UseCase:
    @log_fn
    async def run(self) -> Result:
        return Result(value="test")

# router.py
from use_case import UseCase, Result

async def main():
    result = await UseCase().run()
    print(result.value)  # Error on 3.13: possibly-missing-attribute