let device = null;

// Connect to the ASUS keyboard HID device
async function connectDevice() {
  const [d] = await navigator.hid.requestDevice({
    filters: [{ vendorId: 0x0b05, productId: 0x4543 }],
  });
  if (!d) throw new Error("❌ No device selected");
  await d.open();
  device = d;
  console.log("✅ Connected to:", d.productName);
}

// Send a 4-byte command wrapped in 64-byte HID report
async function sendCommand(b0, b1, b2, b3) {
  if (!device || !device.opened) throw new Error("❌ Device not connected");
  const report = new Uint8Array(64);
  report[0] = b0;
  report[1] = b1;
  report[2] = b2;
  report[3] = b3;

  const hex = [b0, b1, b2, b3].map(b => b.toString(16).padStart(2, '0')).join(' ');
  console.log(`➡️ Sending: ${hex}`);
  await device.sendFeatureReport(0x5a, report);
}

// Disable touchpad
async function disableTouchpad() {
  await sendCommand(0xf4, 0x00, 0x00, 0x00);
}

// Enable touchpad
async function enableTouchpad() {
  await sendCommand(0xf4, 0x00, 0x00, 0x01);
}