"""This file intent is to make library with python3.8
    compatibility with asyncio.
    High-level support for working with threads in asyncio"""
import asyncio
import functools
import contextvars

from asyncio import events


async def to_thread(func, /, *args, **kwargs):  # pragma: no cover
    """Asynchronously run function *func* in a separate thread.

    Any *args and **kwargs supplied for this function are directly passed
    to *func*. Also, the current :class:`contextvars.Context` is propagated,
    allowing context variables from the main thread to be accessed in the
    separate thread.

    Return a coroutine that can be awaited
    to get the eventual result of *func*.
    """
    loop = events.get_running_loop()
    ctx = contextvars.copy_context()
    func_call = functools.partial(ctx.run, func, *args, **kwargs)
    return await loop.run_in_executor(None, func_call)

if not hasattr(asyncio, "to_thread"):  # pragma: no cover
    asyncio.to_thread = to_thread