"""Construct desktop fixtures without touching a running application's resources."""

from pathlib import Path
from typing import TypeVar
from PyQt6.QtWidgets import QWidget
from python_app.gui.controllers.sections.views import SectionView

_Widget = TypeVar("_Widget", bound=QWidget)
import json
import os
import tempfile
from unittest import mock

from PyQt6.QtCore import QCoreApplication, QEvent

from python_app.gui.app_window import AppWindow
from python_app.gui.controllers.web_controller import WebBridge


def isolated_window(add_cleanup) -> AppWindow:
    temporary = tempfile.TemporaryDirectory(prefix="radar_gui_test_")
    add_cleanup(temporary.cleanup)
    root = Path(temporary.name)
    source = Path(__file__).resolve().parents[2]
    payload = json.loads((source / "run_config_examples/run_config_simulator.example.json").read_text(encoding="utf-8"))
    for name, ring in payload["rings"].items():
        ring["name"] = f"/{root.name}_{name}"
    payload["run"]["processing_live_config_path"] = str(root / "python_app/runtime/processing_live.json")
    payload["control_button"]["enabled"] = False
    profile = root / "run_config.json"
    profile.write_text(json.dumps(payload), encoding="utf-8")
    with mock.patch.dict(os.environ, {
        "RADAR_SYSTEM_PROFILE": str(profile), "RADAR_SYSTEM_AUTO_START": "0",
        "RADAR_SYSTEM_AUTO_APPLY_RADAR": "0",
    }), mock.patch.object(WebBridge, "start_server"):
        window = AppWindow(root)

    def destroy_window() -> None:
        window.close()
        # Close stops services; Qt must destroy the widget tree before Python GC
        # can collect the controller callbacks and their graphics objects.
        window.deleteLater()
        QCoreApplication.sendPostedEvents(window, QEvent.Type.DeferredDelete)

    add_cleanup(destroy_window)
    return window


def widget(view: SectionView, name: str, kind: type[_Widget]) -> _Widget:
    value = view.fields[name]
    assert isinstance(value, kind), name
    return value