declare const com: any;

/**

* IMU (accelerometer) access. The G2 gates its accelerometer stream behind an

* ImuCtrl control message; once enabled, the firmware reports x/y/z samples as

* sys-events, which the Java communicator decodes and forwards here.

*

* Note: this stream has historically been unreliable — the firmware may not

* populate IMU data at all. Treat it as experimental.

*

* Talks to the active communicator via the FaceclawBleCommunicator.getActive()

* static, so it works from any isolate without threading the bridge through.

*/

export type ImuReading = { x: number; y: number; z: number; source: number };

function activeCommunicator(): any {

if (!global.isAndroid) return null;

try {

return com.faceclaw.app.FaceclawBleCommunicator.getActive();

} catch {

return null;

}

}

/** Enable/disable the accelerometer report stream. No-op if not connected. */

export function setImuReportEnabled(enable: boolean, reportFreq: number): void {

const active = activeCommunicator();

if (!active) return;

try {

active.setImuReportEnabled(enable, Math.max(0, Math.round(reportFreq)));

} catch (error) {

console.warn(`setImuReportEnabled failed: ${error}`);

}

}

/** Subscribe to IMU readings; returns an unsubscribe function. */

export function addImuListener(listener: (reading: ImuReading) => void): () => void {

const active = activeCommunicator();

if (!active) return () => {};

const proxy = new com.faceclaw.app.FaceclawImuListener({

onImuData: (x: number, y: number, z: number, source: number) => {

listener({ x: Number(x), y: Number(y), z: Number(z), source: Number(source) });

},

});

active.addImuListener(proxy);

return () => {

try {

activeCommunicator()?.removeImuListener(proxy);

} catch {

// The instance may be gone after a disconnect; nothing to clean up.

}

};

}

/** Map an IMU sample's EventSource to a short label. */

export function imuSourceLabel(source: number): string {

switch (source) {

case 1:

return "R arm";

case 2:

return "ring";

case 3:

return "L arm";

default:

return "device";

}

}