from __future__ import annotations

import subprocess
from unittest.mock import patch

from django.test import SimpleTestCase

from pobsync_backend.self_check import _systemd_checks


class SystemdSelfCheckTests(SimpleTestCase):
    def test_journal_permission_hint_is_reported_as_failure(self) -> None:
        def which(binary: str) -> str | None:
            if binary in {"systemctl", "journalctl"}:
                return f"/usr/bin/{binary}"
            return None

        active_result = subprocess.CompletedProcess(
            args=["systemctl"],
            returncode=0,
            stdout="active\n",
            stderr="",
        )
        journal_result = subprocess.CompletedProcess(
            args=["journalctl"],
            returncode=0,
            stdout="",
            stderr="No journal files were opened due to insufficient permissions.",
        )

        with patch("pobsync_backend.self_check.Path.exists", return_value=True), patch(
            "pobsync_backend.self_check.shutil.which",
            side_effect=which,
        ), patch(
            "pobsync_backend.self_check.subprocess.run",
            side_effect=[active_result, active_result, active_result, journal_result],
        ):
            checks = _systemd_checks()

        journal_check = next(check for check in checks if check.name == "Journal access")
        self.assertEqual(journal_check.status, "failed")
        self.assertEqual(journal_check.message, "pobsync cannot read service logs.")