// Define LED pins
const int ledPins[] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13};
const int numLeds = 12;
const int buttonPin =  A0; // Push button to change modes
int mode = 0;
int lastButtonState = HIGH;

void setup() {
    for (int i = 0; i < numLeds; i++) {
        pinMode(ledPins[i], OUTPUT);
    }
    pinMode(buttonPin, INPUT_PULLUP); // Internal pull-up resistor
}

void loop() {
    int buttonState = digitalRead(buttonPin);
    if (buttonState == LOW && lastButtonState == HIGH) {
        mode = (mode + 1) % 10; // Cycle through 10 modes
        delay(300); // Debounce delay
    }
    lastButtonState = buttonState;
    
    switch (mode) {
        case 0: allOn(); break;
        case 1: allOff(); break;
        case 2: chase(); break;
        case 3: reverseChase(); break;
        case 4: blinkAll(); break;
        case 5: alternateLeds(); break;
        case 6: knightRider(); break;
        case 7: waveEffect(); break;
        case 8: randomLeds(); break;
        case 9: breathingEffect(); break;
    }
}

void allOn() {
    for (int i = 0; i < numLeds; i++) {
        digitalWrite(ledPins[i], HIGH);
    }
}

void allOff() {
    for (int i = 0; i < numLeds; i++) {
        digitalWrite(ledPins[i], LOW);
    }
}

void chase() {
    for (int i = 0; i < numLeds; i++) {
        digitalWrite(ledPins[i], HIGH);
        delay(100);
        digitalWrite(ledPins[i], LOW);
    }
}

void reverseChase() {
    for (int i = numLeds - 1; i >= 0; i--) {
        digitalWrite(ledPins[i], HIGH);
        delay(100);
        digitalWrite(ledPins[i], LOW);
    }
}

void blinkAll() {
    allOn();
    delay(300);
    allOff();
    delay(300);
}

void alternateLeds() {
    for (int i = 0; i < numLeds; i += 2) {
        digitalWrite(ledPins[i], HIGH);
    }
    delay(300);
    for (int i = 0; i < numLeds; i += 2) {
        digitalWrite(ledPins[i], LOW);
    }
    for (int i = 1; i < numLeds; i += 2) {
        digitalWrite(ledPins[i], HIGH);
    }
    delay(300);
    allOff();
}

void knightRider() {
    for (int i = 0; i < numLeds; i++) {
        digitalWrite(ledPins[i], HIGH);
        delay(100);
        digitalWrite(ledPins[i], LOW);
    }
    for (int i = numLeds - 2; i > 0; i--) {
        digitalWrite(ledPins[i], HIGH);
        delay(100);
        digitalWrite(ledPins[i], LOW);
    }
}

void waveEffect() {
    for (int i = 0; i < numLeds; i++) {
        digitalWrite(ledPins[i], HIGH);
        if (i > 0) digitalWrite(ledPins[i - 1], LOW);
        delay(100);
    }
    allOff();
}

void randomLeds() {
    int randLed = random(0, numLeds);
    digitalWrite(ledPins[randLed], HIGH);
    delay(200);
    digitalWrite(ledPins[randLed], LOW);
}

void breathingEffect() {
    for (int brightness = 0; brightness <= 255; brightness += 5) {
        for (int i = 0; i < numLeds; i++) {
            analogWrite(ledPins[i], brightness);
        }
        delay(10);
    }
    for (int brightness = 255; brightness >= 0; brightness -= 5) {
        for (int i = 0; i < numLeds; i++) {
            analogWrite(ledPins[i], brightness);
        }
        delay(10);
    }
}