const int leftButton = 8;   // Button controlling the left LED
const int rightButton = 11; // Button controlling the right LED
const int leftTurnLED = A0; // LED for left turn signal
const int rightTurnLED = A1;// LED for right turn signal

unsigned long lastLeftBlink = 0;   // Tracks last time left LED blinked
unsigned long lastRightBlink = 0;  // Tracks last time right LED blinked
unsigned long lastBothBlink = 0;   // Tracks last time both LEDs blinked together
unsigned long lastUpdate = 0;      // Tracks time for state update
unsigned long lastBothCheck = 0;   // Tracks time to check if both buttons are pressed

int blinkInterval = 300;           // Blinking interval for LEDs
int leftButtonState = 0;           // Tracks left button presses
int rightButtonState = 0;          // Tracks right button presses
bool bothButtonsPressed = false;   // Flag for both buttons pressed
int leftDoubleState = 0;           // Double press state for left button
int rightDoubleState = 0;          // Double press state for right button

int lastLeftButtonState = LOW;     // Last state of the left button
int lastRightButtonState = LOW;    // Last state of the right button

void setup() {
  pinMode(leftButton, INPUT);    
  pinMode(rightButton, INPUT);   
  pinMode(leftTurnLED, OUTPUT);  
  pinMode(rightTurnLED, OUTPUT); 
}

void controlTurnSignals() {
  int leftButtonValue = digitalRead(leftButton);   
  int rightButtonValue = digitalRead(rightButton); 

  // Handle left button press
  if (leftButtonValue == HIGH && lastLeftButtonState == LOW) {
    leftDoubleState++;
    leftButtonState++;
    rightButtonState = 0; // Reset right button state
  }

  // Handle right button press
  if (rightButtonValue == HIGH && lastRightButtonState == LOW) {
    rightButtonState++;
    rightDoubleState++;
    leftButtonState = 0;  // Reset left button state
  }

  // Check if both buttons are pressed
  if (millis() - lastBothCheck >= 200) {
    if (leftDoubleState == 1 && rightDoubleState == 1) {
      leftButtonState = 0;
      rightButtonState = 0;
      bothButtonsPressed = true;

      // Blink both LEDs together
      if (millis() - lastBothBlink >= blinkInterval) {
        digitalWrite(rightTurnLED, !digitalRead(rightTurnLED));  
        digitalWrite(leftTurnLED, digitalRead(rightTurnLED));    
        lastBothBlink = millis();
      }
    } else {
      leftDoubleState = 0;
      rightDoubleState = 0;
      bothButtonsPressed = false;
    }
    lastBothCheck = millis();
  }

  // Handle individual button control
  if (millis() - lastUpdate >= 200 && !bothButtonsPressed) {
    // Left button active
    if (leftButtonState == 1 && millis() - lastLeftBlink >= blinkInterval) {
      digitalWrite(leftTurnLED, !digitalRead(leftTurnLED));  
      digitalWrite(rightTurnLED, LOW);                       
      lastLeftBlink = millis();
      rightButtonState = 0; 
    } else if (leftButtonState == 0 && rightDoubleState == 0) {
      digitalWrite(leftTurnLED, LOW);  
    }

    // Right button active
    if (rightButtonState == 1 && millis() - lastRightBlink >= blinkInterval) {
      digitalWrite(rightTurnLED, !digitalRead(rightTurnLED));  
      digitalWrite(leftTurnLED, LOW);                          
      lastRightBlink = millis();
    } else if (rightButtonState == 0 && leftDoubleState == 0) {
      digitalWrite(rightTurnLED, LOW);  
    }

    lastUpdate = millis();
  }

  // Update the last button states
  lastLeftButtonState = leftButtonValue;
  lastRightButtonState = rightButtonValue;

  // Reset button states if both are pressed multiple times
  if (leftDoubleState > 1 && rightDoubleState > 1) {
    leftDoubleState = 0;
    rightDoubleState = 0;
    leftButtonState = 0;
    rightButtonState = 0;
  }

  // Ensure buttons don't remain at 1 unless pressed together
  if (leftButtonState > 1) leftButtonState = 0;
  if (rightButtonState > 1) rightButtonState = 0;
}

void loop() {
  controlTurnSignals();  // Continuously control the turn signals
}