const options = new xb.Options();
options.enableReticles();
options.enableGestures();
// Opt specific gestures in (names: pinch, open-palm, fist, thumbs-up, point, spread).
options.gestures.setGestureEnabled('point', true);
options.gestures.setGestureEnabled('spread', true);
options.hands.enabled = true; // gestures need hands
options.simulator.defaultMode = xb.SimulatorMode.POSE; // pose hands on desktop
xb.init(options);

class GestureLogger extends xb.Script {
  init() {
    const gestures = xb.core.gestureRecognition;
    if (!gestures) {
      console.warn('Call options.enableGestures() before xb.init().');
      return;
    }
    this._onStart = (event) => {
      const {hand, name, confidence = 0} = event.detail; // hand: 'left'|'right'
      console.log(`${hand} started ${name} (${confidence.toFixed(2)})`);
    };
    this._onEnd = (event) => {
      const {hand, name} = event.detail;
      console.log(`${hand} ended ${name}`);
    };
    gestures.addEventListener('gesturestart', this._onStart);
    gestures.addEventListener('gestureend', this._onEnd);
    // 'gestureupdate' fires continuously while a gesture is held.
  }
  dispose() {
    const g = xb.core.gestureRecognition;
    if (!g) return;
    g.removeEventListener('gesturestart', this._onStart);
    g.removeEventListener('gestureend', this._onEnd);
  }
}