from functools import wraps, partial

from .. import _core
from ..abc import Clock, Instrument


# Use:
#
#    @trio_test
#    async def test_whatever():
#        await ...
#
# Also: if a pytest fixture is passed in that subclasses the Clock abc, then
# that clock is passed to trio.run().
def trio_test(fn):
    @wraps(fn)
    def wrapper(**kwargs):
        __tracebackhide__ = True
        clocks = [c for c in kwargs.values() if isinstance(c, Clock)]
        if not clocks:
            clock = None
        elif len(clocks) == 1:
            clock = clocks[0]
        else:
            raise ValueError("too many clocks spoil the broth!")
        instruments = [i for i in kwargs.values() if isinstance(i, Instrument)]
        return _core.run(partial(fn, **kwargs), clock=clock, instruments=instruments)

    return wrapper