// Switch and LED Pins
const int redSwitch = 2;
const int greenSwitch = 3;
const int blueSwitch = 4;
const int DefaultSwitch = 8;
const int redLED = 5;
const int greenLED = 6;
const int blueLED = 7;
const int DefaultLED = 9;

// Timing variables for non-blocking blinking
unsigned long previousMillisRed = 0;
unsigned long previousMillisGreen = 0;
unsigned long previousMillisBlue = 0;
unsigned long previousMillisDeafult = 0;
const long interval = 200;
bool redState = LOW;
bool greenState = LOW;
bool blueState = LOW;
bool DefaultState = LOW;

void setup() {
  // Initialize switches as inputs with pull-up resistors
  pinMode(redSwitch, INPUT_PULLUP);
  pinMode(greenSwitch, INPUT_PULLUP);
  pinMode(blueSwitch, INPUT_PULLUP);
  pinMode(DefaultSwitch, INPUT_PULLUP);

  // Initialize LEDs as outputs
  pinMode(redLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(blueLED, OUTPUT);
  pinMode(DefaultLED, OUTPUT);
}

void loop() {
  if (digitalRead(redSwitch) == LOW) {
    blinkLED(redLED, previousMillisRed, redState);
  } else {
    digitalWrite(redLED, LOW);
  }

  if (digitalRead(greenSwitch) == LOW) {
    blinkLED(greenLED, previousMillisGreen, greenState);
  } else {
    digitalWrite(greenLED, LOW);
  }

  if (digitalRead(blueSwitch) == LOW) {
    blinkLED(blueLED, previousMillisBlue, blueState);
  } else {
    digitalWrite(blueLED, LOW);
  }

    if (digitalRead(DefaultSwitch) == LOW) {
    blinkLED(DefaultLED, previousMillisBlue, DefaultState);
  } else {
    digitalWrite(DefaultLED, LOW);
  }
}

// Non-blocking LED blinking function
void blinkLED(int ledPin, unsigned long &previousMillis, bool &state) {
  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    state = !state;
    digitalWrite(ledPin, state);
  }
}