"""Shared fixtures for the customer app UI tests.

The tests render real Qt widgets with the offscreen platform plugin, so they need
no display and no camera hardware. A single ``QApplication`` is shared by the
whole session (Qt forbids creating more than one).
"""

from __future__ import annotations

import os
import sys
from pathlib import Path

import pytest

os.environ.setdefault("QT_QPA_PLATFORM", "offscreen")
if sys.platform == "win32" and "QT_QPA_FONTDIR" not in os.environ:
    _fonts = Path(os.environ.get("WINDIR", r"C:\Windows")) / "Fonts"
    if _fonts.is_dir():
        os.environ["QT_QPA_FONTDIR"] = str(_fonts)

# ``tools/ui_check.py`` owns the palette rules; importing it keeps one source of
# truth between the pytest suite and the dependency-free checker.
_TOOLS_DIR = Path(__file__).resolve().parents[1] / "tools"
if _TOOLS_DIR.is_dir() and str(_TOOLS_DIR) not in sys.path:
    sys.path.insert(0, str(_TOOLS_DIR))


@pytest.fixture(scope="session")
def qt_app():
    from PyQt5.QtWidgets import QApplication

    app = QApplication.instance() or QApplication([])
    yield app


@pytest.fixture
def make_window(qt_app, tmp_path, monkeypatch):
    """Build a ``CustomerMainWindow`` whose preference writes stay in tmp_path."""
    from orisys_app_shared import prefs as prefs_pkg
    from orisys_app_shared import paths as paths_mod
    from orisys_customer.app_window import CustomerMainWindow

    prefs_file = tmp_path / "preference.json"
    monkeypatch.setattr(paths_mod, "preference_path", lambda: prefs_file)
    monkeypatch.setattr(prefs_pkg.store, "preference_path", lambda: prefs_file)

    default_prefs = {
        "language": "zh_CN",
        "theme": "dark",
        "sensor_type": "box",
        "source_mode": "camera",
    }

    created = []

    def _make(**overrides):
        data = dict(default_prefs)
        data.update(overrides)
        window = CustomerMainWindow(prefs=data)
        created.append(window)
        return window

    yield _make

    for window in created:
        try:
            window.close()
        except Exception:
            pass


def visible_descendants(widget):
    """Yield every visible descendant widget of ``widget``."""
    for child in widget.findChildren(object):
        if not hasattr(child, "isVisible") or not hasattr(child, "geometry"):
            continue
        if child.isVisible():
            yield child