// Traffic lights
#define GREEN1 32
#define ORANGE1 17
#define RED1 18
#define GREEN2 23
#define ORANGE2 21
#define RED2 19

// Pedestrian lights
#define PED_RED 16
#define PED_GREEN 4

// 7-Segment display pins
int segPins[7] = {25, 26, 27, 14, 12, 33, 22};

const byte digits[10][7] = {
  {1,1,1,1,1,1,0}, // 0
  {0,1,1,0,0,0,0}, // 1
  {1,1,0,1,1,0,1}, // 2
  {1,1,1,1,0,0,1}, // 3
  {0,1,1,0,0,1,1}, // 4
  {1,0,1,1,0,1,1}, // 5
  {1,0,1,1,1,1,1}, // 6
  {1,1,1,0,0,0,0}, // 7
  {1,1,1,1,1,1,1}, // 8
  {1,1,1,1,0,1,1}  // 9
};

void displayDigit(int num) {
  for (int k = 0; k < 7; k++) {
    digitalWrite(segPins[k], digits[num][k]);
  }
}

// NEW: Countdown function for pedestrian crossing
void Countdown(int seconds) {
  for (int i = seconds; i >= 0; i--) {
    displayDigit(i); // Show countdown on 7-segment display
    delay(1000);     // Wait 1 second
  }
}

void setup() {
  // Initialize traffic lights
  pinMode(RED1, OUTPUT);
  pinMode(ORANGE1, OUTPUT);
  pinMode(GREEN1, OUTPUT);
  pinMode(RED2, OUTPUT);
  pinMode(ORANGE2, OUTPUT);
  pinMode(GREEN2, OUTPUT);
  
  // Initialize pedestrian lights
  pinMode(PED_RED, OUTPUT);
  pinMode(PED_GREEN, OUTPUT);

  // Initialize 7-segment display
  for (int k = 0; k < 7; k++) {
    pinMode(segPins[k], OUTPUT);
  }
  
  // Start with all lights off (safety)
  allLightsOff();
}

void allLightsOff() {
  digitalWrite(RED1, LOW);
  digitalWrite(ORANGE1, LOW);
  digitalWrite(GREEN1, LOW);
  digitalWrite(RED2, LOW);
  digitalWrite(ORANGE2, LOW);
  digitalWrite(GREEN2, LOW);
  digitalWrite(PED_RED, LOW);
  digitalWrite(PED_GREEN, LOW);
}

void loop() {
  // Phase 1: Traffic light 1 green, traffic light 2 red, pedestrians red
  digitalWrite(RED1, LOW);
  digitalWrite(GREEN1, HIGH);
  digitalWrite(RED2, HIGH);
  digitalWrite(PED_RED, HIGH);  // Pedestrian red
  digitalWrite(PED_GREEN, LOW);
  delay(5000);  // 5 seconds green light
  
  // Phase 2: Traffic light 1 yellow, traffic light 2 red, pedestrians red
  digitalWrite(GREEN1, LOW);
  digitalWrite(ORANGE1, HIGH);
  delay(2000);  // 2 seconds warning
  
  // Phase 3: All traffic lights red for safety
  digitalWrite(ORANGE1, LOW);
  digitalWrite(RED1, HIGH);
  delay(100);  // all-red
  
  // Phase 4: Traffic light 1 red, traffic light 2 green, pedestrians green with countdown
  digitalWrite(RED2, LOW);
  digitalWrite(GREEN2, HIGH);
  digitalWrite(PED_RED, LOW);
  digitalWrite(PED_GREEN, HIGH);
  Countdown(9);  // 9-second pedestrian crossing
  
  // Blink pedestrian green before turning red
  for (int i = 0; i < 3; i++) {
    digitalWrite(PED_GREEN, LOW);
    delay(50);
    digitalWrite(PED_GREEN, HIGH);
    delay(50);
  }
  digitalWrite(PED_GREEN, LOW);
  digitalWrite(PED_RED, HIGH);
  
  // Phase 5: Traffic light 1 red, traffic light 2 yellow
  digitalWrite(GREEN2, LOW);
  digitalWrite(ORANGE2, HIGH);
  delay(2000);  // 2 seconds warning
  
  // Phase 6: All traffic lights red for safety
  digitalWrite(ORANGE2, LOW);
  digitalWrite(RED2, HIGH);
  delay(100);  //  all-red
}