from pathlib import Path

import pytest


HELPER_PATH = "/usr/local/libexec/left4me/left4me-overlay"


def test_mount_invokes_helper_with_name_only(monkeypatch: pytest.MonkeyPatch) -> None:
    from l4d2host.fs.kernel_overlayfs import KernelOverlayFSMounter

    calls: list[list[str]] = []

    def fake_run_command(cmd, **kwargs):
        del kwargs
        calls.append(list(cmd))

    monkeypatch.setattr("l4d2host.fs.kernel_overlayfs.run_command", fake_run_command)

    KernelOverlayFSMounter().mount(
        lowerdirs="/var/lib/left4me/installation",
        upperdir=Path("/var/lib/left4me/runtime/alpha/upper"),
        workdir=Path("/var/lib/left4me/runtime/alpha/work"),
        merged=Path("/var/lib/left4me/runtime/alpha/merged"),
    )

    assert calls == [["sudo", "-n", HELPER_PATH, "mount", "alpha"]]


def test_unmount_invokes_helper_with_umount_verb(monkeypatch: pytest.MonkeyPatch) -> None:
    from l4d2host.fs.kernel_overlayfs import KernelOverlayFSMounter

    calls: list[list[str]] = []

    def fake_run_command(cmd, **kwargs):
        del kwargs
        calls.append(list(cmd))

    monkeypatch.setattr("l4d2host.fs.kernel_overlayfs.run_command", fake_run_command)

    KernelOverlayFSMounter().unmount(merged=Path("/var/lib/left4me/runtime/alpha/merged"))

    assert calls == [["sudo", "-n", HELPER_PATH, "umount", "alpha"]]


def test_mount_propagates_run_command_kwargs(monkeypatch: pytest.MonkeyPatch) -> None:
    from l4d2host.fs.kernel_overlayfs import KernelOverlayFSMounter

    captured: dict = {}

    def fake_run_command(cmd, **kwargs):
        captured["cmd"] = list(cmd)
        captured["kwargs"] = kwargs

    monkeypatch.setattr("l4d2host.fs.kernel_overlayfs.run_command", fake_run_command)

    out: list[str] = []
    err: list[str] = []
    KernelOverlayFSMounter().mount(
        lowerdirs="/var/lib/left4me/installation",
        upperdir=Path("/var/lib/left4me/runtime/alpha/upper"),
        workdir=Path("/var/lib/left4me/runtime/alpha/work"),
        merged=Path("/var/lib/left4me/runtime/alpha/merged"),
        on_stdout=out.append,
        on_stderr=err.append,
        passthrough=False,
        should_cancel=lambda: False,
    )

    assert captured["cmd"][0:3] == ["sudo", "-n", HELPER_PATH]
    captured["kwargs"]["on_stdout"]("hi")
    captured["kwargs"]["on_stderr"]("oops")
    assert out == ["hi"]
    assert err == ["oops"]
    assert captured["kwargs"]["passthrough"] is False
    assert callable(captured["kwargs"]["should_cancel"])