#define NUM_LEDS 10
#define DELAY_TIME 500

int ledPins[NUM_LEDS] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
int patternIndex = 0;

void setup() {
  // Initialize all LED pins as outputs
  for (int i = 0; i < NUM_LEDS; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}

void loop() {
  // Call different patterns based on patternIndex
  switch (patternIndex) {
    case 0: pattern0(); break;
    case 1: pattern1(); break;
    case 2: pattern2(); break;
    case 3: pattern3(); break;
    case 4: pattern4(); break;
    case 5: pattern5(); break;
    case 6: pattern6(); break;
    case 7: pattern7(); break;
    case 8: pattern8(); break;
    case 9: pattern9(); break;
  }
  
  // Move to the next pattern
  patternIndex = (patternIndex + 1) % 10;
  delay(3000); // Display each pattern for 3 seconds
}

void pattern0() {
  // All LEDs ON and OFF
  for (int i = 0; i < NUM_LEDS; i++) {
    digitalWrite(ledPins[i], HIGH);
  }
  delay(DELAY_TIME);
  for (int i = 0; i < NUM_LEDS; i++) {
    digitalWrite(ledPins[i], LOW);
  }
  delay(DELAY_TIME);
}

void pattern1() {
  // Alternate LEDs ON and OFF
  for (int i = 0; i < NUM_LEDS; i += 2) {
    digitalWrite(ledPins[i], HIGH);
  }
  delay(DELAY_TIME);
  for (int i = 0; i < NUM_LEDS; i += 2) {
    digitalWrite(ledPins[i], LOW);
  }
  delay(DELAY_TIME);
}

void pattern2() {
  // LEDs ON one by one
  for (int i = 0; i < NUM_LEDS; i++) {
    digitalWrite(ledPins[i], HIGH);
    delay(DELAY_TIME);
    digitalWrite(ledPins[i], LOW);
  }
}

void pattern3() {
  // LEDs OFF one by one
  for (int i = NUM_LEDS - 1; i >= 0; i--) {
    digitalWrite(ledPins[i], HIGH);
    delay(DELAY_TIME);
    digitalWrite(ledPins[i], LOW);
  }
}

void pattern4() {
  // LEDs blink in pairs
  for (int i = 0; i < NUM_LEDS; i += 2) {
    digitalWrite(ledPins[i], HIGH);
    digitalWrite(ledPins[i+1], HIGH);
    delay(DELAY_TIME);
    digitalWrite(ledPins[i], LOW);
    digitalWrite(ledPins[i+1], LOW);
    delay(DELAY_TIME);
  }
}

void pattern5() {
  // LEDs blink from the edges to the center
  for (int i = 0; i < NUM_LEDS / 2; i++) {
    digitalWrite(ledPins[i], HIGH);
    digitalWrite(ledPins[NUM_LEDS-1-i], HIGH);
    delay(DELAY_TIME);
    digitalWrite(ledPins[i], LOW);
    digitalWrite(ledPins[NUM_LEDS-1-i], LOW);
    delay(DELAY_TIME);
  }
}

void pattern6() {
  // LEDs blink from the center to the edges
  for (int i = 0; i < NUM_LEDS / 2; i++) {
    digitalWrite(ledPins[NUM_LEDS/2 - 1 - i], HIGH);
    digitalWrite(ledPins[NUM_LEDS/2 + i], HIGH);
    delay(DELAY_TIME);
    digitalWrite(ledPins[NUM_LEDS/2 - 1 - i], LOW);
    digitalWrite(ledPins[NUM_LEDS/2 + i], LOW);
    delay(DELAY_TIME);
  }
}

void pattern7() {
  // All LEDs blink rapidly
  for (int j = 0; j < 10; j++) {
    for (int i = 0; i < NUM_LEDS; i++) {
      digitalWrite(ledPins[i], HIGH);
    }
    delay(DELAY_TIME / 10);
    for (int i = 0; i < NUM_LEDS; i++) {
      digitalWrite(ledPins[i], LOW);
    }
    delay(DELAY_TIME / 10);
  }
}

void pattern8() {
  // Chaser effect
  for (int i = 0; i < NUM_LEDS; i++) {
    digitalWrite(ledPins[i], HIGH);
    delay(DELAY_TIME);
    digitalWrite(ledPins[i], LOW);
  }
  for (int i = NUM_LEDS - 2; i >= 0; i--) {
    digitalWrite(ledPins[i], HIGH);
    delay(DELAY_TIME);
    digitalWrite(ledPins[i], LOW);
  }
}

void pattern9() {
  // Random LED blinking
  for (int j = 0; j < 20; j++) {
    int randomLED = random(NUM_LEDS);
    digitalWrite(ledPins[randomLED], HIGH);
    delay(DELAY_TIME / 2);
    digitalWrite(ledPins[randomLED], LOW);
    delay(DELAY_TIME / 2);
  }
}