// Define pin numbers
const int buttonPin = 2;
const int led1Pin = 3;
const int led2Pin = 4;
const int sirenPin = 5;

// Define variables to track button state
int buttonState = 0;
int lastButtonState = 0;

// Define variables to track timing for flashing LEDs and siren activation
unsigned long previousMillis1 = 0;
unsigned long previousMillis2 = 100; // Start LED 2 flashing a bit after LED 1
const long interval = 400; // Flashing interval for both LEDs (milliseconds)
bool led1State = false; // Initial state of LED 1
bool led2State = false; // Initial state of LED 2
unsigned long activationTime = 0; // Time when the siren and lights were activated

// Define variable for siren state
bool sirenOn = false;

void setup() {
  // Set pin modes
  pinMode(buttonPin, INPUT);
  pinMode(led1Pin, OUTPUT);
  pinMode(led2Pin, OUTPUT);
  pinMode(sirenPin, OUTPUT);
}

void loop() {
  // Read the state of the button
  buttonState = digitalRead(buttonPin);

  // Check if the button state has changed
  if (buttonState != lastButtonState) {
    // If the button is pressed
    if (buttonState == HIGH) {
      // Toggle siren state
      sirenOn = !sirenOn;

      // If siren is activated, turn it on
      if (sirenOn) {
        // Also turn on the lights
        digitalWrite(led1Pin, HIGH);
        digitalWrite(led2Pin, HIGH);
        activationTime = millis(); // Record the activation time
      } else { // If siren is deactivated, turn it off
        // Also turn off the lights
        digitalWrite(led1Pin, LOW);
        digitalWrite(led2Pin, LOW);
      }
    }
    delay(50); // Debounce delay
  }

  // Store the current button state for the next iteration
  lastButtonState = buttonState;

  // Flashing LED 1
  unsigned long currentMillis1 = millis();
  if (currentMillis1 - previousMillis1 >= interval) {
    previousMillis1 = currentMillis1;
    led1State = !led1State;
    digitalWrite(led1Pin, led1State); // Toggle LED state
  }

  // Flashing LED 2
  unsigned long currentMillis2 = millis();
  if (currentMillis2 - previousMillis2 >= interval) {
    previousMillis2 = currentMillis2;
    led2State = !led2State;
    digitalWrite(led2Pin, led2State); // Toggle LED state
  }

  // If siren is activated
  if (sirenOn) {
    unsigned long elapsedTime = millis() - activationTime;

    // Modulate the siren frequency over time to create the police siren effect
    if (elapsedTime < 3000) {
      // Rising frequency phase
      tone(sirenPin, 300 + elapsedTime / 10); // Increase frequency over time
    } else if (elapsedTime < 6000) {
      // Falling frequency phase
      tone(sirenPin, 600 - (elapsedTime - 3000) / 10); // Decrease frequency over time
    } else {
      // Loop back to the start of the siren cycle after 6 seconds
      activationTime = millis(); // Restart the activation time
    }
  } else {
    // Turn off the siren if it's not activated
    noTone(sirenPin);
  }

  // Turn off the siren and lights after 10 seconds
  if (sirenOn && millis() - activationTime >= 10000) {
    sirenOn = false;
    digitalWrite(led1Pin, LOW);
    digitalWrite(led2Pin, LOW);
  }
}