int ledGREEN1 = 1;
int ledYELLOW1 = 2;
int ledRED1 = 3;

int ledGREEN2 = 4;
int ledYELLOW2 = 5;
int ledRED2 = 6;

int btnPin1 = 8;
int btnPin2 = 9;

int currentState = 0;

unsigned long startTime = 0;

void setup() {
  pinMode(ledGREEN1, OUTPUT);
  pinMode(ledYELLOW1, OUTPUT);
  pinMode(ledRED1, OUTPUT);

  pinMode(ledGREEN2, OUTPUT);
  pinMode(ledYELLOW2, OUTPUT);
  pinMode(ledRED2, OUTPUT);

  pinMode(btnPin1, INPUT);
  pinMode(btnPin2, INPUT);

  startTime = millis();
}

void loop() {
  int buttonState1 = digitalRead(btnPin1);
  int buttonState2 = digitalRead(btnPin2);

  unsigned long currentTime = millis();
  unsigned long elapsedTime = currentTime - startTime;

  if (buttonState1 == HIGH && digitalRead(ledGREEN1) == HIGH) {
    if (currentState != 4) {
      currentState = 4;
      startTime = currentTime;
    }
  }
  else if (buttonState1 == HIGH) {
    currentState = 2;
    startTime = currentTime;
  }

  if (buttonState2 == HIGH && digitalRead(ledGREEN2) == HIGH) {
    if (currentState != 5) {
      currentState = 5;
      startTime = currentTime;
    }
  }
  else if (buttonState2 == HIGH) {
    currentState = 0;
    startTime = currentTime;
  }

  trafficLightsSequence();
}

void trafficLightsSequence(){
  unsigned long currentTime = millis();
  unsigned long elapsedTime = currentTime - startTime;

  switch (currentState) {
    case 0:
      if (elapsedTime <= 5000) {
      digitalWrite(ledGREEN1, HIGH);
      digitalWrite(ledYELLOW1, LOW);
      digitalWrite(ledRED1, LOW);

      digitalWrite(ledGREEN2, LOW);
      digitalWrite(ledYELLOW2, LOW);
      digitalWrite(ledRED2, HIGH);
      }
      else {
        currentState = 1;
        startTime = currentTime;
      }
    break;

    case 1:
      if (elapsedTime <= 2000) {
        digitalWrite(ledGREEN1, LOW);
        digitalWrite(ledYELLOW1, HIGH);
        digitalWrite(ledRED1, LOW);

        digitalWrite(ledGREEN2, LOW);
        digitalWrite(ledYELLOW2, LOW);
        digitalWrite(ledRED2, HIGH);
      } 
      else {
        currentState = 2;
        startTime = currentTime;
      }
    break;

    case 2:
      if (elapsedTime <= 5000) {
        digitalWrite(ledGREEN1, LOW);
        digitalWrite(ledYELLOW1, LOW);
        digitalWrite(ledRED1, HIGH);

        digitalWrite(ledGREEN2, HIGH);
        digitalWrite(ledYELLOW2, LOW);
        digitalWrite(ledRED2, LOW);
      }
      else {
        currentState = 3;
        startTime = currentTime;
      }
    break;

    case 3:
      if (elapsedTime <= 2000) {
        digitalWrite(ledGREEN1, LOW);
        digitalWrite(ledYELLOW1, LOW);
        digitalWrite(ledRED1, HIGH);

        digitalWrite(ledGREEN2, LOW);
        digitalWrite(ledYELLOW2, HIGH);
        digitalWrite(ledRED2, LOW);
      }
      else {
        currentState = 0;
        startTime = currentTime;
      }
    break;

    case 4:
      if (elapsedTime <= 500) {
        digitalWrite(ledGREEN1, LOW);
        delay(100);
        digitalWrite(ledYELLOW1, HIGH);
        digitalWrite(ledRED1, LOW);

        digitalWrite(ledGREEN2, LOW);
        digitalWrite(ledYELLOW2, LOW);
        digitalWrite(ledRED2, HIGH);
      }
      else {
        currentState = 2;
        startTime = currentTime;
      }
    break;

    case 5:
      if (elapsedTime <= 500) {
        digitalWrite(ledGREEN1, LOW);
        digitalWrite(ledYELLOW1, LOW);
        digitalWrite(ledRED1, HIGH);

        digitalWrite(ledGREEN2, LOW);
        delay(100);
        digitalWrite(ledYELLOW2, HIGH);
        digitalWrite(ledRED2, LOW);
      }
      else {
        currentState = 0;
        startTime = currentTime;
      }
    break;
  }
}