"""
Allow conda_package_streaming to work in .tar.bz2-only mode if zstandard is not
available (please immediately install zstandard if this is the case).
"""

import importlib
import sys
import tarfile
import zipfile
from pathlib import Path

import pytest


def test_degraded(tmpdir):
    try:
        sys.modules["zstandard"] = None  # type: ignore

        import conda_package_streaming.extract
        import conda_package_streaming.package_streaming

        importlib.reload(conda_package_streaming.package_streaming)

        testconda = Path(tmpdir, "testconda.conda")
        with zipfile.ZipFile(testconda, "w"):
            pass

        testtar = Path(tmpdir, "test.tar.bz2")
        with tarfile.open(testtar, "w:bz2") as tar:
            pass

        for (
            tar,
            member,
        ) in conda_package_streaming.package_streaming.stream_conda_component(testtar):
            pass

        with pytest.raises(RuntimeError):
            for (
                tar,
                member,
            ) in conda_package_streaming.package_streaming.stream_conda_component(
                testconda
            ):
                pass

        with pytest.raises(RuntimeError):
            conda_package_streaming.extract.extract(testconda, tmpdir)

    finally:
        sys.modules.pop("zstandard", None)

        import conda_package_streaming.package_streaming

        importlib.reload(conda_package_streaming.package_streaming)
        assert conda_package_streaming.package_streaming.zstandard
