// Pin definitions
const int ledPins[] = {2, 3, 4, 5, 6, 7, 8, 9};  // LED pins from 2 to 9
const int switchPins[] = {10, 11, 12, 13};       // Switch pins 10, 11, 12, 13

void setup() {
  // Set LED pins as outputs
  for (int i = 0; i < 8; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
  // Set switch pins as inputs
  for (int i = 0; i < 4; i++) {
    pinMode(switchPins[i], INPUT);
  }
  // Start serial communication
  Serial.begin(9600);
}

void loop() {
  // Read switch states
  bool sw1 = digitalRead(switchPins[0]) == HIGH;
  bool sw2 = digitalRead(switchPins[1]) == HIGH;
  bool sw3 = digitalRead(switchPins[2]) == HIGH;
  bool sw4 = digitalRead(switchPins[3]) == HIGH;

  // Determine speed based on switches
  int speed = getSpeed(sw1, sw2);  // Get the delay time based on speed level

  // Determine the pattern based on the switch combinations
  if (!sw3 && sw4) {
    patternLeftToRightThenRightToLeft(speed);  // 0 0 0 1: Left to Right, then Right to Left
  } else if (sw3 && !sw4) {
    patternInwardToOutwardThenOutwardToInward(speed);  // 0 0 1 0: Inward to Outward, then Outward to Inward
  } else if (sw3 && sw4) {
    patternAlternateBlink(speed);  // 0 0 1 1: Alternate Blink
  } else {
    turnOffAllLEDs();  // Default state: All LEDs off
  }
}

// Function to determine speed based on switches
int getSpeed(bool sw1, bool sw2) {
  if (sw1 && sw2) {
    return 100;  // Very fast
  } else if (sw1 || sw2) {
    return 500;  // Moderate speed
  } else {
    return 1000;  // Slow speed
  }
}

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

// Pattern 1: LED will go from 2 to 9 (left to right) and back from 9 to 2 (right to left)
void patternLeftToRightThenRightToLeft(int speed) {
  // Left to right
  for (int i = 0; i < 8; i++) {
    digitalWrite(ledPins[i], HIGH);
    delay(speed);
    digitalWrite(ledPins[i], LOW);
  }
  // Right to left
  for (int i = 7; i >= 0; i--) {
    digitalWrite(ledPins[i], HIGH);
    delay(speed);
    digitalWrite(ledPins[i], LOW);
  }
}

// Pattern 2: LED will go inward to outward and then outward to inward
void patternInwardToOutwardThenOutwardToInward(int speed) {
  // Inward to outward
  for (int i = 0; i < 4; i++) {
    digitalWrite(ledPins[i], HIGH);
    digitalWrite(ledPins[7 - i], HIGH);
    delay(speed);
    digitalWrite(ledPins[i], LOW);
    digitalWrite(ledPins[7 - i], LOW);
  }
  // Outward to inward
  for (int i = 3; i >= 0; i--) {
    digitalWrite(ledPins[i], HIGH);
    digitalWrite(ledPins[7 - i], HIGH);
    delay(speed);
    digitalWrite(ledPins[i], LOW);
    digitalWrite(ledPins[7 - i], LOW);
  }
}

// Pattern 3: Alternating blink
void patternAlternateBlink(int speed) {
  for (int i = 0; i < 4; i++) {
    digitalWrite(ledPins[i * 2], HIGH);  // Light even-numbered LEDs
  }
  delay(speed);
  for (int i = 0; i < 4; i++) {
    digitalWrite(ledPins[i * 2], LOW);
  }
  for (int i = 0; i < 4; i++) {
    digitalWrite(ledPins[i * 2 + 1], HIGH);  // Light odd-numbered LEDs
  }
  delay(speed);
  for (int i = 0; i < 4; i++) {
    digitalWrite(ledPins[i * 2 + 1], LOW);
  }
}