unsigned long taskSwButton_triggeredMillis = 0;
unsigned long taskSwButton_lastPressedMillis = 0;
unsigned long taskSwButton_disableMillis = 0;
unsigned long taskSwButton_tabKeyDownMillis = 0;
unsigned long taskSwButton_winKeyDownMillis = 0;
unsigned int taskSwButton_execLoopAfter = 250;
unsigned int taskSwButton_disableAfterAction = 1000;
unsigned int taskSwButton_pressDurationMin_veryShortHold = 1;
unsigned int taskSwButton_pressDurationMax_veryShortHold = 250;
unsigned int taskSwButton_pressDurationMin_shortHold = 350;
unsigned int taskSwButton_pressDurationMax_shortHold = 900;
unsigned int taskSwButton_pressDuration_longHold = 1000;

unsigned int taskSwButton_tabKey_Up_After = 2000;
//unsigned int taskSwButton_winKey_Up_After = 3000;

void handleTaskSwitchButton() {
  taskSwButton_lastPressedMillis = millis();
  if (taskSwButton_disableMillis > 0 ) taskSwButton_disableMillis = millis();

  if (taskSwButton_disableMillis == 0) {
    if (taskSwButton_triggeredMillis == 0) {
      taskSwButton_triggeredMillis = millis();
      if(useSerial) Serial.println(F("TASKSWITCH INITIALLY PRESSED"));

      if ( taskSwButton_tabKeyDownMillis > 0 ) {
        taskSwButton_tabKeyDownMillis = millis();
        BootKeyboard.write(KEY_TAB);
      }
      //      else if ( taskSwButton_winKeyDownMillis > 0 ) {
      //        taskSwButton_winKeyDownMillis = millis();
      //        BootKeyboard.write(KEY_ESC);
      //      }
    }
    else if ( (millis() - taskSwButton_triggeredMillis) >= taskSwButton_pressDuration_longHold) {
      // LONG PRESSED
      taskSwButton_triggeredMillis = 0;
      taskSwButton_lastPressedMillis = 0;
      taskSwButton_disableMillis = millis();
      if (useSerial) {
        Serial.println(F("TASKSWITCH LONG HOLD"));
      }
      if (sendHID) {
        if(useSerial) Serial.println(F("sending ALT+F4"));
        BootKeyboard.press(KEY_LEFT_ALT);
        BootKeyboard.press(KEY_F4);
        delay(50);
        BootKeyboard.releaseAll();
      }
    }
  }
}

void handleTaskSwitchButton_extendAltTabTimeout() {
  if(taskSwButton_tabKeyDownMillis > 0) taskSwButton_tabKeyDownMillis = millis();
}

void handleTaskSwitchButton_loop() {
  // handle Power Button short press

  if (taskSwButton_triggeredMillis > 0) {
    if (taskSwButton_lastPressedMillis > 0) {
      if ((millis() - taskSwButton_lastPressedMillis) > taskSwButton_execLoopAfter) {
        unsigned int tDelta;
        if(taskSwButton_lastPressedMillis == taskSwButton_triggeredMillis) tDelta = 1;
        else tDelta = taskSwButton_lastPressedMillis - taskSwButton_triggeredMillis;

        if (debug) {
          Serial.print(F("TASKSWITCH held for "));
          Serial.print(tDelta);
          Serial.println("ms");
        }

        if (tDelta >= taskSwButton_pressDurationMin_shortHold && tDelta <= taskSwButton_pressDurationMax_shortHold) {
          // SHORT PRESSED
          if (useSerial) {
            Serial.println(F("TASKSWITCH SHORT HOLD"));
            Serial.println("sending ALT+TAB");
          }
          if (sendHID) {
            // sending ALT+TAB (leaving TAB engaged
            BootKeyboard.press(KEY_LEFT_ALT);
            BootKeyboard.write(KEY_TAB);
          }
          taskSwButton_tabKeyDownMillis = millis();

          taskSwButton_triggeredMillis = 0;
          taskSwButton_lastPressedMillis = 0;
          //taskSwButton_disableMillis = millis();
        }
        else if (tDelta >= taskSwButton_pressDurationMin_veryShortHold && tDelta < taskSwButton_pressDurationMax_veryShortHold) {
          // VERY SHORT HOLD
          if (useSerial) Serial.println(F("POWER VERY SHORT HOLD"));

          //if ((millis() - taskSwButton_winKeyDownMillis) > taskSwButton_winKey_Up_After) {
          if (taskSwButton_tabKeyDownMillis == 0) {
            if (useSerial) Serial.println("sending WIN-KEY");
            if (sendHID) {
              BootKeyboard.write(KEY_LEFT_WINDOWS);
            }
            //taskSwButton_winKeyDownMillis = millis();
          }

          taskSwButton_triggeredMillis = 0;
          taskSwButton_lastPressedMillis = 0;
          //taskSwButton_disableMillis = millis();
        }
        else {
          // button was pressed too long for "SHORT PRESSED"
          if (useSerial) {
            Serial.println(F("TASKSWITCH BUTTON CANCELLED"));
          }
          taskSwButton_triggeredMillis = 0;
          taskSwButton_lastPressedMillis = 0;
        }
      }
    }
  }

  if (taskSwButton_disableMillis > 0) {
    if ((millis() - taskSwButton_disableMillis) > taskSwButton_disableAfterAction) {
      taskSwButton_triggeredMillis = 0;
      taskSwButton_lastPressedMillis = 0;
      taskSwButton_disableMillis = 0;
    }
  }

  if (taskSwButton_tabKeyDownMillis > 0) {
    if ((millis() - taskSwButton_tabKeyDownMillis) > taskSwButton_tabKey_Up_After) {
      taskSwButton_tabKeyDownMillis = 0;
      if (sendHID) BootKeyboard.releaseAll();
    }
  }

  //  if (taskSwButton_winKeyDownMillis > 0) {
  //    if ((millis() - taskSwButton_winKeyDownMillis) > taskSwButton_winKey_Up_After) {
  //      taskSwButton_winKeyDownMillis = 0;
  //    }
  //  }
}