// Define constants for LED pins
const int LED_PIN_1 = 5;
const int LED_PIN_2 = 6;
const int LED_PIN_3 = 7;

// Define constants for button pins
const int BUTTON_PIN_1 = 2;
const int BUTTON_PIN_2 = 3;
const int BUTTON_PIN_3 = 4;

// Variables to track active LED
int activeLED = 0;

void setup() {
    // Initialize LED pins as outputs
    pinMode(LED_PIN_1, OUTPUT);
    pinMode(LED_PIN_2, OUTPUT);
    pinMode(LED_PIN_3, OUTPUT);

    // Initialize button pins as inputs with internal pull-ups
    pinMode(BUTTON_PIN_1, INPUT_PULLUP);
    pinMode(BUTTON_PIN_2, INPUT_PULLUP);
    pinMode(BUTTON_PIN_3, INPUT_PULLUP);
}

void loop() {
    // Check button 1 state
    if (digitalRead(BUTTON_PIN_1) == LOW) {
        // Button 1 pressed, switch active LED to 1 and turn off others
        activeLED = 1;
        digitalWrite(LED_PIN_2, LOW);
        digitalWrite(LED_PIN_3, LOW);
    }

    // Check button 2 state
    else if (digitalRead(BUTTON_PIN_2) == LOW) {
        // Button 2 pressed, switch active LED to 2 and turn off others
        activeLED = 2;
        digitalWrite(LED_PIN_1, LOW);
        digitalWrite(LED_PIN_3, LOW);
    }

    // Check button 3 state
    else if (digitalRead(BUTTON_PIN_3) == LOW) {
        // Button 3 pressed, switch active LED to 3 and turn off others
        activeLED = 3;
        digitalWrite(LED_PIN_1, LOW);
        digitalWrite(LED_PIN_2, LOW);
    }
    
    // Blink the active LED
    if (activeLED == 1) {
        blinkLED(LED_PIN_1);
    } else if (activeLED == 2) {
        blinkLED(LED_PIN_2);
    } else if (activeLED == 3) {
        blinkLED(LED_PIN_3);
    }
}

// Function to blink an LED
void blinkLED(int pin) {
    digitalWrite(pin, !digitalRead(pin)); // Toggle the LED state
    delay(200);      // Adjust blink rate as needed
}