/*
   Forum: 
   Wokwi: https://wokwi.com/projects/439167530687499265

  2025/08/13
  ec2021

  Two signal lights synchronized by time
  The signals are for cars and pedestrians moving in the same or opposite direction
  * left: Car signals
  * right: Pedestrian signals 
  

*/


constexpr unsigned long durationRed {4000};
constexpr unsigned long durationYellowRed {2000};
constexpr unsigned long durationYellow {2000};
constexpr unsigned long durationGreen {4000};


struct signalPins {
  uint8_t Red;
  uint8_t Yellow;
  uint8_t Green;
};


enum signalState {RED, YELLOWRED, YELLOW, GREEN};

class SignalLightClass {
  private:
    signalPins carPin;
    signalPins persPin;
    signalState carState;
    unsigned long startTime = 0;
    unsigned long duration;
    void changeState() {
      switch (carState) {
        case RED:
          carState = YELLOWRED;
          setSignal(HIGH, HIGH, LOW, HIGH, LOW);
          duration = durationYellowRed;
          break;
        case YELLOWRED:
          carState = GREEN;
          setSignal(LOW, LOW, HIGH, LOW, HIGH);
          duration = durationGreen;
          break;
        case YELLOW:
          carState = RED;
          setSignal(HIGH, LOW, LOW, HIGH, LOW);
          duration = durationRed;
          break;
        case GREEN:
          carState = YELLOW;
          setSignal(LOW, HIGH, LOW, HIGH, LOW);
          duration = durationYellow;
          break;
      }
    };
    void setSignal(byte Red, byte Yellow, byte Green, byte pRed, byte pGreen) {
      digitalWrite(carPin.Red, Red);
      digitalWrite(carPin.Yellow, Yellow);
      digitalWrite(carPin.Green, Green);
      digitalWrite(persPin.Red, pRed);
      digitalWrite(persPin.Green, pGreen);
    };

  public:
    SignalLightClass(signalPins cPins, signalPins pPins) : carPin(cPins), persPin(pPins) {};
    void init(signalState startState) {
      pinMode(carPin.Red, OUTPUT);
      pinMode(carPin.Yellow, OUTPUT);
      pinMode(carPin.Green, OUTPUT);
      pinMode(persPin.Red, OUTPUT);
      pinMode(persPin.Green, OUTPUT);
      switch (startState) {
        case RED:
          carState = YELLOW;
          break;
        case YELLOWRED:
          carState = RED;
          break;
        case YELLOW:
          carState = GREEN;
          break;
        case GREEN:
          carState = YELLOWRED;
          break;
      }
      startTime = millis();
      changeState();
    };
    void run() {
      if (millis() - startTime > duration) {
        startTime = millis();
        changeState();
      }
    };
};

SignalLightClass signal1 = {{11, 12, 13}, {9, 0, 10}};
SignalLightClass signal2 = {{17, 16, 15}, {19, 0, 18}};

void setup() {
  signal1.init(GREEN);
  signal2.init(RED);

}

void loop() {
  signal1.run();
  signal2.run();

}