#define RED_PIN_1 12
#define GREEN_PIN_1 11
#define YELLOW_PIN_1 10
#define RED_PIN_2 7
#define GREEN_PIN_2 6
#define YELLOW_PIN_2 5

#define RED_DELAY 5000
#define GREEN_DELAY 4000
#define YELLOW_DELAY 1000

// Setting up the parameters for each millisecond delay
unsigned long previousMillis_1 = 0;
unsigned long previousMillis_2 = 0;
unsigned long previousMillis_3 = 0;

void setup() {
  // Setting up output pins for Traffic light 1
  pinMode(RED_PIN_1, OUTPUT);
  pinMode(GREEN_PIN_1, OUTPUT);
  pinMode(YELLOW_PIN_1, OUTPUT);

  // Setting up output pins for Traffic light 2
  pinMode(RED_PIN_2, OUTPUT);
  pinMode(GREEN_PIN_2, OUTPUT);
  pinMode(YELLOW_PIN_2, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:

  unsigned long currentMillis = millis(); // Reads time from the start of program in milliseconds

  // ### Default scenario with no switches pressed ###
  // First interval
  digitalWrite(RED_PIN_1, HIGH);     // Turn on first red light
  digitalWrite(GREEN_PIN_2, HIGH);  // Turn on second green light
  delay(GREEN_DELAY);               // Wait for green light to turn off

  // Second interval
  digitalWrite(GREEN_PIN_2, LOW);   // Turn off second green light
  digitalWrite(YELLOW_PIN_2, HIGH); // Turn on second yellow light
  delay(YELLOW_DELAY);              // Wait for yellow light to turn off

  // Third interval
  digitalWrite(YELLOW_PIN_2, LOW);  // Turn off second yellow light
  digitalWrite(RED_PIN_2, HIGH);    // Turn on second red light
  digitalWrite(RED_PIN_1, LOW);     // Turn off second red light
  digitalWrite(GREEN_PIN_1, HIGH);  // Turn on first green light
  delay(GREEN_DELAY);               // Wait for green light to turn off

  // Fourth interval
  digitalWrite(GREEN_PIN_1, LOW);   // Turn off first green light
  digitalWrite(YELLOW_PIN_1, HIGH); // Turn on first yellow light
  delay(YELLOW_DELAY);       // Wait for yellow light to turn off
  
  digitalWrite(YELLOW_PIN_1, LOW);  // Turn off first yellow light
  digitalWrite(RED_PIN_2, LOW);     // Turn off second red light
  // #################################################

  
  

  // ### Code Example for millis() ###
  // if (currentMillis - previousMillis >= interval) {
  //  previousMillis = currentMillis;
  //}


}

void changeLights(int RED1, int RED2, int YELLOW1, int YELLOW2, int GREEN1, int GREEN2) {
  // Function for RESET each of the traffic lights upon switch press
  
  // For the first interval
  digitalWrite(GREEN2, LOW);    // Turn off opposite green light
  digitalWrite(YELLOW2, HIGH);  // Turn on opposite yellow light
  digitalWrite(RED1, HIGH);     // Turn on adjacent red light
  delay(YELLOW_DELAY);            // Set the time for opposite yellow light

  // For the second interval
  digitalWrite(RED1, LOW);      // Turn off adjacent red light
  digitalWrite(GREEN1, HIGH);   // Turn on adjacent green light
  digitalWrite(RED2, HIGH);     // Turn on opposite red light
  delay(GREEN_DELAY);           // Set the time for adjacent green light

  // For the third interval
  digitalWrite(GREEN1, LOW);    // Turn off adjacent green light
  digitalWrite(YELLOW1, HIGH);  // Turn on adjacent yellow light
  delay(YELLOW_DELAY);           // Set the time for adjacent yellow light

  // For the fourth and final interval
  digitalWrite(RED1, HIGH);     // Turn on adjacent red light
  digitalWrite(RED2, LOW);      // Turn off opposite red light
  digitalWrite(GREEN2, HIGH);   // Turn on opposite green light
}