// Pin settings
const int ledPins[] = {6, 7, 8, 9, 10, 11, 12, 13}; // LED pins
const int btnPin = 2;  // Button pin

// Variables
int pattern = 0;         // Pattern index
bool btnPressed = false; // Button state
unsigned long prevMillis = 0;
const unsigned long interval = 500; // Time interval for LED changes

void setup() {
  for (int i = 0; i < 8; i++) {
    pinMode(ledPins[i], OUTPUT); // Set LED pins as output
  }
  pinMode(btnPin, INPUT_PULLUP); // Set button pin as input
}

void loop() {
  if (digitalRead(btnPin) == LOW && !btnPressed) {
    btnPressed = true;
    pattern = (pattern + 1) % 5;  // Cycle through 5 patterns
    delay(200); // Debounce delay
  } else if (digitalRead(btnPin) == HIGH) {
    btnPressed = false;
  }

  switch (pattern) {
    case 0:
      pattern1();
      break;
    case 1:
      pattern2();
      break;
    case 2:
      pattern3();
      break;
    case 3:
      pattern4();
      break;
    case 4:
      pattern5();
      break;
  }
}

// Pattern 1: LED chase from pin 6 to pin 13, on then off
void pattern1() {
  static int cnt = 0;
  unsigned long curMillis = millis();
  if (curMillis - prevMillis >= interval) {
    prevMillis = curMillis;
    allOff();
    digitalWrite(ledPins[cnt], HIGH);
    cnt++;
    if (cnt >= 8) cnt = 0;
  }
}

// Pattern 2: LED chase from pin 13 to pin 6, on then off
void pattern2() {
  static int cnt = 7;
  unsigned long curMillis = millis();
  if (curMillis - prevMillis >= interval) {
    prevMillis = curMillis;
    allOff();
    digitalWrite(ledPins[cnt], HIGH);
    cnt--;
    if (cnt < 0) cnt = 7;
  }
}

// Pattern 3: LEDs from pin 13 and 6 run towards each other, then back
void pattern3() {
  static int cnt = 0;
  unsigned long curMillis = millis();
  if (curMillis - prevMillis >= interval) {
    prevMillis = curMillis;
    allOff();
    digitalWrite(ledPins[cnt], HIGH);
    digitalWrite(ledPins[7 - cnt], HIGH);
    cnt++;
    if (cnt > 3) cnt = 0;
  }
}

// Pattern 4: LEDs chase from pin 6 to pin 13, stay on, then off all and repeat
void pattern4() {
  static int cnt = 0;
  unsigned long curMillis = millis();
  if (curMillis - prevMillis >= interval) {
    prevMillis = curMillis;
    allOff();
    for (int i = 0; i <= cnt; i++) {
      digitalWrite(ledPins[i], HIGH);
    }
    cnt++;
    if (cnt >= 8) {
      allOff();
      cnt = 0;
    }
  }
}

// Pattern 5: All LEDs on, then off
void pattern5() {
  static bool ledsOn = false;
  unsigned long curMillis = millis();
  if (curMillis - prevMillis >= 1000) {
    prevMillis = curMillis;
    ledsOn = !ledsOn;
    if (ledsOn) allOn();
    else allOff();
  }
}

// Turn all LEDs off
void allOff() {
  for (int i = 0; i < 8; i++) {
    digitalWrite(ledPins[i], LOW);
  }
}

// Turn all LEDs on
void allOn() {
  for (int i = 0; i < 8; i++) {
    digitalWrite(ledPins[i], HIGH);
  }
}