//Challenge 1: make the red button work as green button (15 minutes)
//Challenge 2 (30 minutes) - add green LED for green buttton and
//red led for red button- let them glow. Turn green off when hit green button
//turn red off when hit red button
const int greenbutton = 2; // Green Button
const int redbutton = 3;   // Red Button

const int greenLED = 4; // Green LED
const int redLED = 5;   // Red LED

volatile bool greenbuttonPressed = false;
volatile bool redbuttonPressed = false;

bool greenLEDState = false;
bool redLEDState = false;

void setup() {

  Serial.begin(9600);
  
  pinMode(greenbutton, INPUT_PULLUP);
  pinMode(redbutton, INPUT_PULLUP);

  pinMode(greenLED, OUTPUT);
  pinMode(redLED, OUTPUT);

  digitalWrite(greenLED, LOW); // LED for Green Button OFF
  digitalWrite(redLED, LOW);   // LED for Red Button OFF

  attachInterrupt(digitalPinToInterrupt(greenbutton), greenbuttonISR, FALLING);
  attachInterrupt(digitalPinToInterrupt(redbutton), redbuttonISR, FALLING);
}

void loop() {
  // Check if Green button was pressed
  if (greenbuttonPressed) {
    greenbuttonPressed = false; // Reset the flag
    greenLEDState = !greenLEDState; // Toggle the state of the Green LED
    digitalWrite(greenLED, greenLEDState ? HIGH : LOW); // Set LED state

    // If the Green LED is turned ON, turn OFF the Red LED
    if (greenLEDState) {
      redLEDState = false; // Update the state
      digitalWrite(redLED, LOW); // Turn off Red LED
      Serial.println("Green Button was pressed! LED ON");
    } else {
      Serial.println("Green Button was pressed again! LED OFF");
    }
  }

  // Check if Red button was pressed
  if (redbuttonPressed) {
    redbuttonPressed = false; // Reset the flag
    redLEDState = !redLEDState; // Toggle the state of the Red LED
    digitalWrite(redLED, redLEDState ? HIGH : LOW); // Set LED state

    // If the Red LED is turned ON, turn OFF the Green LED
    if (redLEDState) {
      greenLEDState = false; // Update the state
      digitalWrite(greenLED, LOW); // Turn off Green LED
      Serial.println("Red Button was pressed! LED ON");
    } else {
      Serial.println("Red Button was pressed again! LED OFF");
    }
  }
}

// ISR for Green button
void greenbuttonISR() {
  greenbuttonPressed = true; // Set the flag for the Green button
}

// ISR for Red button
void redbuttonISR() {
  redbuttonPressed = true; // Set the flag for the Red button
}