// Linux commands
void keyboard_Mode0() {
  if (key) {
    switch (key) {
      case KEYBOARD_KEY1:
        Consumer.write(MEDIA_VOLUME_MUTE);
        break;
      case KEYBOARD_KEY2: 
        Keyboard.press(KEY_LEFT_GUI); delay(SYSTEM_KEY_WAIT); Keyboard.release(KEY_LEFT_GUI); delay(SYSTEM_GUI_WAIT);
        Keyboard.print("firefox"); delay(SYSTEM_GUI_WAIT);
        Keyboard.press(KEY_RETURN); delay(SYSTEM_KEY_WAIT); Keyboard.release(KEY_RETURN); 
        pixels.setPixelColor(KEYBOARD_KEY2, pixels.Color(  0, 127,   0));
        break;
      case KEYBOARD_KEY3:
        Keyboard.press(KEY_LEFT_GUI); delay(SYSTEM_KEY_WAIT); Keyboard.release(KEY_LEFT_GUI); delay(SYSTEM_GUI_WAIT); 
        Keyboard.print("spotify"); delay(SYSTEM_GUI_WAIT);
        Keyboard.press(KEY_RETURN);
        pixels.setPixelColor(KEYBOARD_KEY3, pixels.Color(  0, 127,   0));
        break;
      case KEYBOARD_KEY4:
        Consumer.write(MEDIA_PLAY_PAUSE);
        break;
      case KEYBOARD_KEY5:
        Keyboard.press(KEY_LEFT_GUI); delay(SYSTEM_KEY_WAIT); Keyboard.release(KEY_LEFT_GUI); delay(SYSTEM_GUI_WAIT);
        Keyboard.println("keepassxc"); delay(SYSTEM_GUI_WAIT);
        Keyboard.press(KEY_ENTER); 
        pixels.setPixelColor(KEYBOARD_KEY5, pixels.Color(  0, 127,   0));
        break;
      case KEYBOARD_KEY6:
        Keyboard.press(KEY_LEFT_GUI); delay(SYSTEM_KEY_WAIT); Keyboard.release(KEY_LEFT_GUI); delay(SYSTEM_GUI_WAIT);
        Keyboard.print("kicad"); delay(SYSTEM_GUI_WAIT);
        Keyboard.press(KEY_RETURN);
        pixels.setPixelColor(KEYBOARD_KEY6, pixels.Color(  0, 127,   0));
        break;
      case KEYBOARD_KEY7:
        Keyboard.press(KEY_LEFT_GUI); delay(SYSTEM_KEY_WAIT); Keyboard.release(KEY_LEFT_GUI); delay(SYSTEM_GUI_WAIT);
        Keyboard.print("inkscape"); delay(SYSTEM_GUI_WAIT);
        Keyboard.press(KEY_RETURN);
        pixels.setPixelColor(KEYBOARD_KEY7, pixels.Color(  0, 127,   0));
        break;
      case KEYBOARD_KEY8:
        Keyboard.press(KEY_LEFT_GUI); delay(SYSTEM_KEY_WAIT); Keyboard.release(KEY_LEFT_GUI); delay(SYSTEM_GUI_WAIT);
        Keyboard.print("freecad"); delay(SYSTEM_GUI_WAIT);
        Keyboard.press(KEY_RETURN);
        pixels.setPixelColor(KEYBOARD_KEY8, pixels.Color(  0, 127,   0));
        break;
      case KEYBOARD_KEY9:
        Keyboard.press(KEY_LEFT_GUI); delay(SYSTEM_KEY_WAIT); Keyboard.release(KEY_LEFT_GUI); delay(SYSTEM_GUI_WAIT);
        Keyboard.print("nautilus"); delay(SYSTEM_GUI_WAIT);
        Keyboard.press(KEY_RETURN);
        pixels.setPixelColor(KEYBOARD_KEY9, pixels.Color(  0, 127,   0));
        break;
      case KEYBOARD_KEYA:
        Keyboard.press(KEY_LEFT_GUI); delay(SYSTEM_KEY_WAIT); Keyboard.release(KEY_LEFT_GUI); delay(SYSTEM_GUI_WAIT); 
        Keyboard.print("terminal"); delay(SYSTEM_GUI_WAIT);
        Keyboard.press(KEY_RETURN);
        pixels.setPixelColor(KEYBOARD_KEYA, pixels.Color(  0, 127,   0));
        break;
      case KEYBOARD_KEYB: 
        Keyboard.press(KEY_LEFT_GUI); delay(SYSTEM_KEY_WAIT); Keyboard.release(KEY_LEFT_GUI); delay(SYSTEM_GUI_WAIT); 
        Keyboard.print("lightburn"); delay(SYSTEM_GUI_WAIT);
        Keyboard.press(KEY_RETURN);
        pixels.setPixelColor(KEYBOARD_KEYB, pixels.Color(  0, 127,   0));
        break;
      case KEYBOARD_KEYC:
        Keyboard.press(KEY_LEFT_GUI); delay(SYSTEM_KEY_WAIT); Keyboard.release(KEY_LEFT_GUI); delay(SYSTEM_GUI_WAIT);
        Keyboard.print("prusaslicer"); delay(SYSTEM_GUI_WAIT);
        Keyboard.press(KEY_RETURN);
        pixels.setPixelColor(KEYBOARD_KEYC, pixels.Color(  0, 127,   0));
        break;
    }
    pixels.show();
    delay(SYSTEM_KEY_WAIT);
    Keyboard.releaseAll();
    colorUpdate = 1;
  }
}

void colors_Mode0() {
  if (colorUpdate == 1) {
    pixels.setPixelColor(KEYBOARD_KEY0, pixels.Color(   0,   0,   0));  // off
    pixels.setPixelColor(KEYBOARD_KEY1, pixels.Color(   0,   0,   0));  // off
    pixels.setPixelColor(KEYBOARD_KEY2, pixels.Color( 127,  31,   0));  // orange
    pixels.setPixelColor(KEYBOARD_KEY3, pixels.Color(   0,  63,   0));  // green
    pixels.setPixelColor(KEYBOARD_KEY4, pixels.Color(   0,   0,   0));  // off
    pixels.setPixelColor(KEYBOARD_KEY5, pixels.Color(   0, 127,   0));  // green
    pixels.setPixelColor(KEYBOARD_KEY6, pixels.Color( 127,  63,   0));  // yellow
    pixels.setPixelColor(KEYBOARD_KEY7, pixels.Color(  15,  15,  15));  // gray
    pixels.setPixelColor(KEYBOARD_KEY8, pixels.Color(  31,  31, 127));  // blue
    pixels.setPixelColor(KEYBOARD_KEY9, pixels.Color(  31,  63,  31));  // gray
    pixels.setPixelColor(KEYBOARD_KEYA, pixels.Color(   7,   7,   7));  // gray
    pixels.setPixelColor(KEYBOARD_KEYB, pixels.Color( 127,   0,   0));  // red
    pixels.setPixelColor(KEYBOARD_KEYC, pixels.Color( 127,  31,   0));  // orange

    pixels.show();
    
    colorUpdate = 0;
  }
}

void encoderA_Mode0(){
  long newPos = RotaryEncoderA.read()/ROTARY_SENSITIVITY; 
  if (newPos != positionEncoderA && newPos < positionEncoderA) {
    positionEncoderA = newPos;
    Consumer.write(MEDIA_VOLUME_UP);
  }

  if (newPos != positionEncoderA && newPos > positionEncoderA) {
    positionEncoderA = newPos;
    Consumer.write(MEDIA_VOLUME_DOWN);
  }
}

void encoderB_Mode1(){
  long newPos = RotaryEncoderB.read()/ROTARY_SENSITIVITY; 
  if (newPos != positionEncoderB && newPos < positionEncoderB) {
    positionEncoderB = newPos;
    Consumer.write(MEDIA_NEXT);
  }

  if (newPos != positionEncoderB && newPos > positionEncoderB) {
    positionEncoderB = newPos;
    Consumer.write(MEDIA_PREVIOUS);
  }
}

void display_Mode0() {
    unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= 3000) { // if the elasped time greater than 3 seconds
    previousMillis = currentMillis;             // save the last time you checked the interval
    switch (updateLCD_flag) {
      case 0:    
        lcd.clear();
        lcd.setCursor(0, 0); lcd.print("1: empty");
        lcd.setCursor(0, 1); lcd.print("2: Terminal");
        lcd.setCursor(0, 2); lcd.print("3: Firefox");
        lcd.setCursor(0, 3); lcd.print("4: alt+F4");
        updateLCD_flag = 1;
        break;
      case 1:    
        lcd.clear();
        lcd.setCursor(0, 0); lcd.print("5: empty");
        lcd.setCursor(0, 1); lcd.print("6: KiCAD");
        lcd.setCursor(0, 2); lcd.print("7: Inkscape");
        lcd.setCursor(0, 3); lcd.print("8: FreeCAD");
        updateLCD_flag = 2;
        break;
      case 2:    
        lcd.clear();
        lcd.setCursor(0, 0); lcd.print(" 9: empty");
        lcd.setCursor(0, 1); lcd.print("SYSTEM_KEY_WAIT: empty");
        lcd.setCursor(0, 2); lcd.print("11: LightBurn");
        lcd.setCursor(0, 3); lcd.print("12: PrusaSlicer");
        updateLCD_flag = 0;
        break; 
    }
  }
}