// Pin definitions
const int led1 = 8;
const int led2 = 9;
const int button1 = 2; // Interrupt pin 1
const int button2 = 3; // Interrupt pin 2

// Flags for interrupt events
volatile bool led1State = false;
volatile bool led2State = false;
unsigned long lastDebounceTime1 = 0;  // Last debounce time for button 1
unsigned long lastDebounceTime2 = 0;  // Last debounce time for button 2
unsigned long debounceDelay = 150;     // debounce time in milliseconds

void setup() {
  // Set LED pins as OUTPUT
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);

  // Set button pins as INPUT_PULLUP (internal pull-up resistors)
  pinMode(button1, INPUT_PULLUP);
  pinMode(button2, INPUT_PULLUP);

  // Attach interrupts to the button pins
  attachInterrupt(digitalPinToInterrupt(button1), toggleLed1, FALLING); // Trigger on falling edge
  attachInterrupt(digitalPinToInterrupt(button2), toggleLed2, FALLING); // Trigger on falling edge

  // Start serial communication
  Serial.begin(9600);
}

void loop() {
  // Main loop with a long delay
  Serial.println("Waiting for interrupt...");
  Serial.println("Executing Delay...");
  delay(5000); // Simulate a long delay
  
  // Main loop does not handle LED logic anymore
}

// Interrupt service routines
void toggleLed1() {
  // Debounce logic for button1 (button1 interrupt)
  if ((millis() - lastDebounceTime1) > debounceDelay) {
    led1State = !led1State; // Toggle the state of LED1
    digitalWrite(led1, led1State); // Control LED1 directly in ISR
    Serial.print("Interrupt on pin ");
    Serial.print(button1);
    Serial.println(" triggered LED1 toggle");
    lastDebounceTime1 = millis(); // Update debounce timer
  }
}

void toggleLed2() {
  // Debounce logic for button2 (button2 interrupt)
  if ((millis() - lastDebounceTime2) > debounceDelay) {
    led2State = !led2State; // Toggle the state of LED2
    digitalWrite(led2, led2State); // Control LED2 directly in ISR
    Serial.print("Interrupt on pin ");
    Serial.print(button2);
    Serial.println(" triggered LED2 toggle");
    lastDebounceTime2 = millis(); // Update debounce timer
  }
}