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import inspect
import typing as t
from functools import wraps

from .utils import _PassArg
from .utils import pass_eval_context

V = t.TypeVar("V")


def async_variant(normal_func):  # type: ignore
    def decorator(async_func):  # type: ignore
        pass_arg = _PassArg.from_obj(normal_func)
        need_eval_context = pass_arg is None

        if pass_arg is _PassArg.environment:

            def is_async(args: t.Any) -> bool:
                return t.cast(bool, args[0].is_async)

        else:

            def is_async(args: t.Any) -> bool:
                return t.cast(bool, args[0].environment.is_async)

        @wraps(normal_func)
        def wrapper(*args, **kwargs):  # type: ignore
            b = is_async(args)

            if need_eval_context:
                args = args[1:]

            if b:
                return async_func(*args, **kwargs)

            return normal_func(*args, **kwargs)

        if need_eval_context:
            wrapper = pass_eval_context(wrapper)

        wrapper.jinja_async_variant = True
        return wrapper

    return decorator


_common_primitives = {int, float, bool, str, list, dict, tuple, type(None)}


async def auto_await(value: t.Union[t.Awaitable["V"], "V"]) -> "V":
    # Avoid a costly call to isawaitable
    if type(value) in _common_primitives:
        return t.cast("V", value)

    if inspect.isawaitable(value):
        return await t.cast("t.Awaitable[V]", value)

    return t.cast("V", value)


async def auto_aiter(
    iterable: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
) -> "t.AsyncIterator[V]":
    if hasattr(iterable, "__aiter__"):
        async for item in t.cast("t.AsyncIterable[V]", iterable):
            yield item
    else:
        for item in t.cast("t.Iterable[V]", iterable):
            yield item


async def auto_to_list(
    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
) -> t.List["V"]:
    return [x async for x in auto_aiter(value)]