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import importlib
import os
from pkgutil import walk_packages

from _pytest.python import Metafunc

from aoc.__main__ import day

dir_path = os.path.dirname(os.path.realpath(__file__))

def pytest_generate_tests(metafunc: Metafunc):
    if 'assignment' in metafunc.fixturenames:
        packages = [
            importlib.import_module(package.name)
            for package in walk_packages([dir_path])
        ]

        assignments = [
            (getattr(package, f'Assignment{day(part)}', None), package)
            for package in packages
            for part in ['1', '2']
        ]

        metafunc.parametrize(
            argnames=f'assignment',
            argvalues=[
                Assignment(path=package.__path__[0])
                for (Assignment, package) in assignments
                if Assignment is not None
            ],
            ids=lambda assignment: str(assignment)
        )