app/src/App.jsx

// App shell: layers in z order - scene canvas (1), halftone (2), CRT (5),
// HUD + touch overlay (9-12), BIOS readout (20), dance controls (25),
// title menu (30). Also owns the pre-game device detection and title -> enter flow.
import { useEffect } from "react";
import GameCanvas from "./scene/GameCanvas.jsx";
import { Halftone, CrtOverlay } from "./ui/Overlays.jsx";
import Hud from "./ui/Hud.jsx";
import TouchOverlay from "./ui/TouchOverlay.jsx";
import BiosOverlay from "./ui/BiosOverlay.jsx";
import TitleMenu from "./ui/TitleMenu.jsx";
import DanceControls from "./ui/DanceControls.jsx";
import { useGame } from "./store.js";

export default function App() {
  useEffect(() => {
    const params = new URLSearchParams(location.search);

    // Gamepad presence for the tutorial variant, before the game controller
    // takes over polling (the game loop keeps mirroring it afterwards).
    const pollPad = () => {
      const gp = [...(navigator.getGamepads?.() ?? [])].find(
        (p) => p && p.connected,
      );
      useGame.setState({ padConnected: !!gp });
    };

    window.addEventListener("gamepadconnected", pollPad);
    window.addEventListener("gamepaddisconnected", pollPad);
    pollPad();

    // Touch detection, latching.
    const coarse = matchMedia("(pointer: coarse)");

    const armTouch = () => {
      window.__microduckTouched = true;
      useGame.setState({ touchMode: true });
    };

    const onCoarse = () => {
      if (coarse.matches) armTouch();
    };

    if (coarse.matches) armTouch();
    else coarse.addEventListener("change", onCoarse);

    window.addEventListener("touchstart", armTouch, {
      once: true,
      passive: true,
    });

    if (params.get("touch") === "1") armTouch();

    // ?boot=1 skips the title entirely - testing hook.
    if (params.get("boot") === "1") {
      useGame.setState({
        prebootDone: true,
        entered: true,
        menuOpen: false,
      });
    } else {
      useGame.setState({
        prebootDone: true,
        menuOpen: true,
      });
    }

    return () => {
      window.removeEventListener("gamepadconnected", pollPad);
      window.removeEventListener("gamepaddisconnected", pollPad);
      coarse.removeEventListener("change", onCoarse);
      window.removeEventListener("touchstart", armTouch);
    };
  }, []);

  return (
    <>
      <GameCanvas />
      <Halftone />
      <CrtOverlay />
      <Hud />
      <TouchOverlay />
      <BiosOverlay />

      {/* N = neck isolation, H = circular neck isolation */}
      <DanceControls />

      <TitleMenu />
    </>
  );
}