// Module #5 project

const int red_LED1 = 14;   // The red LED1 is wired to ESP32 board pin GPIO14
const int yellow_LED1 = 12; // The yellow LED1 is wired to ESP32 board pin GPIO12
const int green_LED1 = 13;  // The green LED1 is wired to ESP32 board pin GPIO13

const int red_LED2 = 25;   // The red LED2 is wired to ESP32 board pin GPIO25
const int yellow_LED2 = 26; // The yellow LED2 is wired to ESP32 board pin GPIO26
const int green_LED2 = 27;  // The green LED2 is wired to ESP32 board pin GPIO27

int Xw_value;

const int Xw_button = 19; // Cross Walk button (GPIO19)

// === NEW: interrupt flag and ISR ===
volatile bool xwRequested = false;              // set in ISR, read in loop
void IRAM_ATTR onXwPress() { xwRequested = true; }  // keep ISR tiny

// the setup function runs once when you press reset or power the board
void setup() {
  pinMode(Xw_button, INPUT_PULLUP); // 0 = pressed, 1 = unpressed button
  attachInterrupt(digitalPinToInterrupt(Xw_button), onXwPress, FALLING); // NEW

  Serial.begin(115200);
  pinMode(red_LED1, OUTPUT);    // initialize digital pin 14 (Red LED1) as an output.
  pinMode(yellow_LED1, OUTPUT); // initialize digital pin 12 (yellow LED1) as an output.
  pinMode(green_LED1, OUTPUT);  // initialize digital pin 13 (green LED1) as an output.

  pinMode(red_LED2, OUTPUT);    // initialize digital pin 25 (Red LED2) as an output.
  pinMode(yellow_LED2, OUTPUT); // initialize digital pin 26 (yellow LED2) as an output.
  pinMode(green_LED2, OUTPUT);  // initialize digital pin 27 (green LED2) as an output.
}

// the loop function runs over and over again forever
void loop() {

  // === NEW: replace digitalRead with flag-driven value ===
  // We mirror your original logic: Xw_value LOW = "pressed".
  Xw_value = xwRequested ? LOW : HIGH;

  if (Xw_value == LOW) { // if crosswalk button (X-button) pressed

    digitalWrite(yellow_LED1 , LOW);  // This should turn off the YELLOW LED1
    digitalWrite(green_LED1, LOW);    // This should turn off the GREEN LED1
    digitalWrite(yellow_LED2 , LOW);  // This should turn off the YELLOW LED2
    digitalWrite(green_LED2, LOW);    // This should turn off the GREEN LED2

    for (int i = 10; i > 0; i--) {
      Serial.print(" Count = "); Serial.print(i);
      Serial.println(" == Walk == ");

      digitalWrite(red_LED1, HIGH);  // This should turn on the RED LED1
      digitalWrite(red_LED2, HIGH);  // This should turn on the RED LED2
      delay(500);  // wait 0.5 seconds
      digitalWrite(red_LED1, LOW);   // This should turn off the RED LED1
      digitalWrite(red_LED2, LOW);   // This should turn off the RED LED2
      delay(500);  // wait 0.5 seconds
    } // End of counter

    // === NEW: clear the request after servicing it ===
    xwRequested = false;
    Xw_value = HIGH;

  } else { // No Emergency ===

    Serial.println(" == Do Not Walk == ");

    // The next three lines of code turn on the red LED1
    digitalWrite(red_LED1, HIGH); // This should turn on the RED LED1
    digitalWrite(yellow_LED1 , LOW);  // This should turn off the YELLOW LED1
    digitalWrite(green_LED1, LOW);    // This should turn off the GREEN LED1

    delay(1000); //Extended time for Red light#1 before the Green of the other side turns ON

    // The next three lines of code turn on the red LED2
    digitalWrite(red_LED2, LOW);    // This should turn off the RED LED2
    digitalWrite(yellow_LED2 , LOW); // This should turn off the YELLOW LED2
    digitalWrite(green_LED2, HIGH); // This should turn on the GREEN LED2

    delay(2000);  // wait for 1 second

    // The next three lines of code turn on the red LED1
    digitalWrite(red_LED1, HIGH);   // This should turn on the RED LED1
    digitalWrite(yellow_LED1 , LOW);  // This should turn off the YELLOW LED1
    digitalWrite(green_LED1, LOW);    // This should turn off the GREEN LED1

    // The next three lines of code turn on the red LED2
    digitalWrite(red_LED2, LOW);     // This should turn off the RED LED2
    digitalWrite(yellow_LED2 , HIGH);// This should turn on the YELLOW LED2
    digitalWrite(green_LED2, LOW);   // This should turn off the GREEN LED2

    delay(2000);  // wait for 1 second

    // The next three lines of code turn on the red LED2
    digitalWrite(red_LED2, HIGH);    // This should turn on the RED LED2
    digitalWrite(yellow_LED2 , LOW); // This should turn off the YELLOW LED2
    digitalWrite(green_LED2, LOW);   // This should turn off the GREEN LED2

    delay(1000); //Extended time for Red light#2 before the Green of the other side turns

    // The next three lines of code turn on the yellow LED1
    digitalWrite(red_LED1, LOW);     // This should turn off the RED LED1
    digitalWrite(yellow_LED1 , LOW); // This should turn off the YELLOW LED1
    digitalWrite(green_LED1, HIGH);  // This should turn on the GREEN LED1

    delay(2000);  // wait for 1 second

    // The next three lines of code turn on the yellow LED1
    digitalWrite(red_LED1, LOW);     // This should turn off the RED LED1
    digitalWrite(yellow_LED1 , HIGH);// This should turn on the YELLOW LED1
    digitalWrite(green_LED1, LOW);   // This should turn off the GREEN LED1

    // The next three lines of code turn on the red LED2
    digitalWrite(red_LED2, HIGH);    // This should turn on the RED LED2
    digitalWrite(yellow_LED2 , LOW); // This should turn off the YELLOW LED2
    digitalWrite(green_LED2, LOW);   // This should turn off the GREEN LED2

    delay(2000);  // wait for 1 second
  } // Emergency Button closing ============
}