// Define pins for each bi-color LED
const int led1Pin1 = 2;   // Pin for one direction
const int led1Pin2 = 15;   // Pin for the opposite direction

const int led2Pin1 = 4;   // Pin for one direction
const int led2Pin2 = 5;   // Pin for the opposite direction

// Variables to control fast/slow blink modes
bool fastBlinkMode = false;   // Flag for fast blinking
unsigned long lastBlinkTime = 0;   // To keep track of timing
unsigned long blinkDuration = 0;   // Duration for the current blink phase

void setup() {
  // Initialize LED pins as outputs
  pinMode(led1Pin1, OUTPUT);
  pinMode(led1Pin2, OUTPUT);
  pinMode(led2Pin1, OUTPUT);
  pinMode(led2Pin2, OUTPUT);

  // Seed the random function with an unpredictable value
  randomSeed(analogRead(A0));  // Assuming A0 is unused and can pick up noise

  // Start with a random blink duration
  blinkDuration = random(5000, 10000);  // Random initial phase duration (5-10 seconds)
}

void loop() {
  unsigned long currentTime = millis();

  // Switch between fast and slow blink modes periodically
  if (currentTime - lastBlinkTime > blinkDuration) {
    fastBlinkMode = !fastBlinkMode;   // Toggle between fast and slow modes
    lastBlinkTime = currentTime;
    if (fastBlinkMode) {
      // Fast mode: shorter phase
      blinkDuration = random(2000, 5000);  // 2-5 seconds for fast blinking
    } else {
      // Slow mode: longer phase
      blinkDuration = random(5000, 10000);  // 5-10 seconds for slow blinking
    }
  }

  // Randomize blinking based on the mode
  if (fastBlinkMode) {
    // Quick, short blinks for fast mode
    randomBlink(led1Pin1, led1Pin2, 20, 150);  // Blink between 20ms to 150ms
    randomBlink(led2Pin1, led2Pin2, 20, 150);
  } else {
    // Slow, relaxed blinks for slow mode
    randomBlink(led1Pin1, led1Pin2, 200, 800);  // Blink between 200ms to 800ms
    randomBlink(led2Pin1, led2Pin2, 200, 800);
  }

  // Short delay between blinks to make them more independent
  delay(random(50, 200));
}

// Function to randomize color and blink pattern based on mode
void randomBlink(int pin1, int pin2, int minDuration, int maxDuration) {
  int state = random(0, 4);  // 4 possible states: Off, Red, Green, Yellow (alternating quickly)
  
  switch (state) {
    case 0:
      // Off
      digitalWrite(pin1, LOW);
      digitalWrite(pin2, LOW);
      break;
    case 1:
      // Red (pin1 HIGH, pin2 LOW)
      digitalWrite(pin1, HIGH);
      digitalWrite(pin2, LOW);
      break;
    case 2:
      // Green (pin1 LOW, pin2 HIGH)
      digitalWrite(pin1, LOW);
      digitalWrite(pin2, HIGH);
      break;
    case 3:
      // Yellow (quickly alternate between red and green)
      for (int i = 0; i < random(5, 15); i++) {  // Alternate 5-15 times for yellow effect
        digitalWrite(pin1, HIGH);
        digitalWrite(pin2, LOW);
        delay(10);  // Very short on time for red
        digitalWrite(pin1, LOW);
        digitalWrite(pin2, HIGH);
        delay(10);  // Very short on time for green
      }
      break;
  }

  // Random blink duration based on mode
  delay(random(minDuration, maxDuration));
}