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#include "Adafruit_TinyUSB.h"

// HID report descriptor
uint8_t const desc_hid_report[] = {
    TUD_HID_REPORT_DESC_KEYBOARD()
};

Adafruit_USBD_HID usb_hid;

void setup() {
  // Initialize Serial for logging
  Serial.begin(115200);
  while (!Serial) {
    delay(10); // Wait for Serial connection
  }
  Serial.println("Starting TinyUSB Keyboard...");

  if (!TinyUSBDevice.isInitialized()) {
    TinyUSBDevice.begin(0);
  }

  usb_hid.setBootProtocol(HID_ITF_PROTOCOL_KEYBOARD);
  usb_hid.setPollInterval(2);
  usb_hid.setReportDescriptor(desc_hid_report, sizeof(desc_hid_report));
  usb_hid.begin();
  Serial.println("USB HID initialized.");

  if (TinyUSBDevice.mounted()) {
    TinyUSBDevice.detach();
    delay(10);
    TinyUSBDevice.attach();
    Serial.println("Device re-enumerated.");
  }
}

void loop() {
#ifdef TINYUSB_NEED_POLLING_TASK
  TinyUSBDevice.task();
#endif

  if (!TinyUSBDevice.mounted()) {
    Serial.println("Device not mounted. Waiting...");
    delay(500);
    return;
  }

  if (!usb_hid.ready()) {
    Serial.println("USB HID not ready. Waiting...");
    delay(100);
    return;
  }

  // Send 'a' key
  uint8_t keycode[6] = {HID_KEY_A, 0, 0, 0, 0, 0};
  usb_hid.keyboardReport(0, 0, keycode);
  Serial.println("Sent 'a' key.");
  delay(100);

  // Release key
  usb_hid.keyboardRelease(0);
  delay(100);
}