// Pin definitions
const int staticLEDs[] = {2, 3, 4, 5}; // Static LEDs on D2, D3, D4, D5
const int flashingLED = A1;            // Flashing LED on A1
const int flickerLEDs[] = {A2, A3, A4, A5}; // Flicker LEDs on A2, A3, A4, A5

// Timing for the flashing LED
const int flashOnTime = 150;  // On time in ms
const int flashOffTime1 = 150; // Off time in ms (first interval)
const int flashOffTime2 = 800; // Off time in ms (second interval)

// Variables for timing
unsigned long previousMillisFlashing = 0; // For flashing LED
unsigned long previousMillisFlicker[4];  // For each flickering LED

// State for the flashing LED
int flashState = 0;

// Setup
void setup() {
  // Initialize static LEDs
  for (int i = 0; i < 4; i++) {
    pinMode(staticLEDs[i], OUTPUT);
    digitalWrite(staticLEDs[i], HIGH); // Turn on static LEDs
  }

  // Initialize flashing LED
  pinMode(flashingLED, OUTPUT);
  digitalWrite(flashingLED, LOW); // Start with the LED off

  // Initialize flicker LEDs
  for (int i = 0; i < 4; i++) {
    pinMode(flickerLEDs[i], OUTPUT);
    previousMillisFlicker[i] = millis(); // Start timing for each flicker LED
  }
}

// Main loop
void loop() {
  // Handle the flashing LED
  handleFlashingLED();

  // Handle the flickering LEDs
  for (int i = 0; i < 4; i++) {
    handleFlickerLED(i);
  }
}

// Function to handle the flashing LED
void handleFlashingLED() {
  unsigned long currentMillis = millis();
  
  switch (flashState) {
    case 0: // Off for the first interval
      if (currentMillis - previousMillisFlashing >= flashOffTime1) {
        flashState = 1;
        previousMillisFlashing = currentMillis;
        digitalWrite(flashingLED, HIGH); // Turn the LED on
      }
      break;
    case 1: // On for 150ms
      if (currentMillis - previousMillisFlashing >= flashOnTime) {
        flashState = 2;
        previousMillisFlashing = currentMillis;
        digitalWrite(flashingLED, LOW); // Turn the LED off
      }
      break;
    case 2: // Off for the second interval
      if (currentMillis - previousMillisFlashing >= flashOffTime2) {
        flashState = 3;
        previousMillisFlashing = currentMillis;
        digitalWrite(flashingLED, HIGH); // Turn the LED on
      }
      break;
    case 3: // On for 150ms again
      if (currentMillis - previousMillisFlashing >= flashOnTime) {
        flashState = 0;
        previousMillisFlashing = currentMillis;
        digitalWrite(flashingLED, LOW); // Turn the LED off
      }
      break;
  }
}

// Function to handle the flickering LEDs
void handleFlickerLED(int index) {
  unsigned long currentMillis = millis();
  
  if (currentMillis - previousMillisFlicker[index] >= random(50, 300)) { // Random interval
    int brightness = random(100, 256); // Random brightness between 100 and 255
    analogWrite(flickerLEDs[index], brightness);
    previousMillisFlicker[index] = currentMillis;
  }
}