from types import SimpleNamespace

import pytest

from l4d2host.logs import stream_instance_logs


class DummyProcess:
    def __init__(self, lines: list[str]) -> None:
        self.stdout = SimpleNamespace(readline=self._readline)
        self.stderr = SimpleNamespace(readline=lambda: "")
        self._lines = iter(lines)
        self.terminated = False
        self.waited = False

    def _readline(self) -> str:
        return next(self._lines, "")

    def poll(self):
        return None if not self.waited else 0

    def terminate(self) -> None:
        self.terminated = True

    def wait(self, timeout: int) -> None:
        del timeout
        self.waited = True


def test_stream_instance_logs_yields_lines(monkeypatch: pytest.MonkeyPatch) -> None:
    proc = DummyProcess(["line1\n", "line2\n", ""])

    def fake_popen(cmd, **kwargs):
        del cmd
        del kwargs
        return proc

    monkeypatch.setattr("l4d2host.logs.subprocess.Popen", fake_popen)

    lines = list(stream_instance_logs("alpha", lines=10, follow=False))
    assert lines == ["line1", "line2"]
    assert proc.terminated is True