"""Preferences must never be written outside the test scratch directory.

The installed app reads ``apps/autocal/preference.json`` at startup. A test that
builds a window and closes it saves preferences through ``closeEvent``, so a test
that forgets to redirect the path rewrites the operator's real settings — which is
exactly what happened: the finger screen started up pointing at a scratch bundle
from a previous run and reported it as missing.

``conftest._isolate_preference_file`` is the net. These tests pin it, because a
fixture that silently stopped applying would look like nothing at all until the app
was next launched by hand.
"""

from __future__ import annotations

from pathlib import Path

APP_ROOT = Path(__file__).resolve().parents[1]
INSTALLED = APP_ROOT / "preference.json"


def test_the_preference_path_is_redirected_under_the_scratch_root():
    from orisys_autocal.preferences import path

    resolved = Path(path()).resolve()
    scratch = (APP_ROOT / "outputs" / "_test_scratch").resolve()
    assert resolved != INSTALLED.resolve()
    assert scratch in resolved.parents, resolved


def test_saving_preferences_leaves_the_installed_file_alone():
    from orisys_autocal import preferences as prefs_mod

    before = INSTALLED.read_bytes() if INSTALLED.is_file() else None

    prefs = prefs_mod.default_preferences()
    prefs["finger_bundle_path"] = str(APP_ROOT / "outputs" / "_test_scratch" / "gone")
    written = Path(prefs_mod.save_preferences(prefs)).resolve()

    assert written != INSTALLED.resolve()
    assert written.is_file(), "the save did not reach the redirected file either"

    after = INSTALLED.read_bytes() if INSTALLED.is_file() else None
    assert after == before, "a test rewrote the installed preference.json"


def test_a_window_that_closes_still_lands_in_the_scratch_directory(qt_app):
    """The failure mode itself: construct, close, check where it wrote."""
    from orisys_autocal import preferences as prefs_mod
    from orisys_autocal.ui.window import AutoCalMainWindow

    before = INSTALLED.read_bytes() if INSTALLED.is_file() else None

    prefs = prefs_mod.default_preferences()
    prefs["finger_bundle_path"] = str(APP_ROOT / "outputs" / "_test_scratch" / "gone")
    window = AutoCalMainWindow(prefs=prefs, auto_load_bundle=False)
    try:
        window.poller.shutdown()
        window.close()
    finally:
        window.poller.shutdown()

    after = INSTALLED.read_bytes() if INSTALLED.is_file() else None
    assert after == before, "closing a test window rewrote the installed preferences"