"""Unit coverage for shared pexpect REPL test helpers."""

from __future__ import annotations

from pathlib import Path

import pytest

from tests.e2e.omnigent._pexpect_harness import ensure_repl_test_theme_env


def test_ensure_repl_test_theme_env_seeds_isolated_home(tmp_path: Path) -> None:
    """Helper writes a persisted theme into a caller-provided fake HOME.

    :param tmp_path: Pytest temporary directory used as the fake HOME root.
    """
    home = tmp_path / "home"
    env = ensure_repl_test_theme_env({"HOME": str(home)})

    config = home / ".omnigent" / "config.yaml"
    assert env["HOME"] == str(home)
    assert "theme: light" in config.read_text(encoding="utf-8")


def test_ensure_repl_test_theme_env_does_not_write_real_home(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """Inherited real HOME is replaced with a temp HOME for the subprocess.

    :param tmp_path: Pytest temporary directory used to model the real HOME.
    :param monkeypatch: Pytest monkeypatch fixture for overriding
        :meth:`Path.home`.
    """
    real_home = tmp_path / "real-home"
    real_home.mkdir()
    databrickscfg = real_home / ".databrickscfg"
    databrickscfg.write_text(
        "[profile]\nhost = https://example.databricks.com\n",
        encoding="utf-8",
    )
    monkeypatch.setattr(Path, "home", lambda: real_home)

    env = ensure_repl_test_theme_env({"HOME": str(real_home)})
    prepared_home = Path(env["HOME"])

    assert prepared_home != real_home
    assert not (real_home / ".omnigent" / "config.yaml").exists()
    assert (prepared_home / ".databrickscfg").samefile(databrickscfg)
    assert "theme: light" in (prepared_home / ".omnigent" / "config.yaml").read_text(
        encoding="utf-8"
    )