"""AR Display Manager entry point."""
from __future__ import annotations

import signal
import sys
from pathlib import Path

REPO_ROOT = Path(__file__).resolve().parents[1]


def run(argv: list[str] | None = None) -> int:
    """Launch the AR Display Manager daemon."""
    try:
        from PySide6.QtWidgets import QApplication
    except ImportError:
        sys.stderr.write(
            "PySide6 is not installed. Run:\n\n"
            "    pip install PySide6\n"
        )
        return 2

    signal.signal(signal.SIGINT, signal.SIG_DFL)  # Ctrl+C kills the process

    app = QApplication(argv if argv is not None else sys.argv)
    app.setApplicationName("AR Display Manager")
    app.setQuitOnLastWindowClosed(False)   # keep running when popup closes

    # Brand icon
    from PySide6.QtGui import QIcon
    _logo = REPO_ROOT / "display" / "assets" / "images" / "ar_logo_full.png"
    if _logo.exists():
        app.setWindowIcon(QIcon(str(_logo)))

    # Apply brand stylesheet
    from arautopilot.studio.ar_style import apply_ar_style
    apply_ar_style(app)

    from display_manager.display_manager import DisplayManager
    _mgr = DisplayManager(app)  # noqa: F841 — kept alive via QObject parent=None

    return app.exec()


if __name__ == "__main__":
    sys.exit(run())