// https://wokwi.com/projects/423250666579251201

# include <Servo.h>

const byte clapButton = 7;    // clap! button

Servo myServo;  // Create a servo object

const int soundSensorPin = A0;  
const int servoPin = 9;       

int soundLevel = 0;     
int previousSoundLevel = 0;
int clapThreshold = 50; 
int clapCount = 0;    

//...
int servoPosition = 90;
const int servoDeviation = 30;    //.. something we can see!
bool direction = true; 
unsigned long lastClapTime = 0; 
unsigned long clapInterval = 1000; 
bool servoMoved = false; 

void setup() {
  Serial.begin(9600);  

  pinMode(clapButton, INPUT_PULLUP);

  myServo.attach(servoPin); 
  myServo.write(servoPosition); 
  delay(100);   //... life too short 
}

void loop() {
  soundLevel = analogRead(soundSensorPin);  
//... you can if you need to  Serial.println(soundLevel);

//... detect a clap served in on the button
  static bool lastButton;
  static bool aButtonClap;
  bool gotClapped = false;

  aButtonClap = digitalRead(clapButton) == LOW;

  if (aButtonClap != lastButton) {
    gotClapped = aButtonClap;
    lastButton = aButtonClap;

    if (gotClapped) Serial.println("              CLAP!");
  }



//  if (abs(soundLevel - previousSoundLevel) > clapThreshold) {
  if (gotClapped) {
    gotClapped = false;
    unsigned long currentTime = millis(); 
//... the first clap... doesn't need to check time!
    if (!clapCount) {
      clapCount = 1;
//      Serial.print("clap now "); Serial.println(clapCount);
    }
    else if (currentTime - lastClapTime < clapInterval) {
      clapCount++; 
//      Serial.print("clap now "); Serial.println(clapCount);
    }
//...    else clapCount = 0; ???

    Serial.print("clap now "); Serial.println(clapCount);

    previousSoundLevel = soundLevel; 
    lastClapTime = currentTime; 
  }

  if (clapCount >= 2 && !servoMoved) {

    if (direction) {
      myServo.write(servoPosition + servoDeviation);  
      delay(500);  
      myServo.write(servoPosition);  
    } else {
      myServo.write(servoPosition - servoDeviation); 
      delay(500); 
      myServo.write(servoPosition);  
    }

    direction = !direction;  
    clapCount = 0;  
    servoMoved = true;  
  }

  if (servoMoved && (millis() - lastClapTime) > clapInterval) {
    servoMoved = false;
  }

  delay(50); 
}