#define ledRed 7
#define ledGrn 8
#define ledBlue 9
#define btn 2

int btnReading = 0 ; // variable used to read the button state 
int clicksCounter = 0; // variable used to count the number of clicks on the button
unsigned long start = 0; // variable to be used to make use of millis instead of delay


void setup() {
  // put your setup code here, to run once:
  pinMode(ledRed, OUTPUT);
  pinMode(ledGrn, OUTPUT);
  pinMode(ledBlue, OUTPUT);
  pinMode(btn, INPUT);
  Serial.begin(9600);

}

void blinkingLeds() {
  //if the time passed is less than a second
  if (millis() - start < 1000) {
    digitalWrite(ledRed, HIGH);
    digitalWrite(ledBlue, LOW);
  }
  //if the time passed is more than 1 second and less than 2 seconds
  else if (millis() - start < 2 * 1000) {
    digitalWrite(ledGrn, HIGH);
    digitalWrite(ledRed, LOW);
  }
    //if the time passed is more than 2 seconds and less than 3 seconds
  else if (millis() - start < 3 * 1000) {
    digitalWrite(ledBlue, HIGH);
    digitalWrite(ledGrn, LOW);
  }
  // if more than 3 seconds has passed restart the start variable (to start from the first led again)
  else {
    start = millis();
  }
}

void loop() {
//read button state
  btnReading = digitalRead(btn);
// a small debounce delay is used for the mechanical issues that comes from clicking the button
  delay(50);
  // detect if button is pressed 
  if ( btnReading == 1) {

    //increase counter by 1
    clicksCounter++;
    //stay in a loop until button is released to detect a the release of button press (press and release)
    while(digitalRead(btn));
    delay(50);
  }


  //check if couter is odd
  if (clicksCounter % 2 != 0) {
    Serial.print(" Counter: ");
    Serial.print(clicksCounter);
    //start blinking
    blinkingLeds();
  }
  else {
    // if counter is even, turn off all leds
    digitalWrite(ledRed, LOW);
    digitalWrite(ledGrn, LOW);
    digitalWrite(ledBlue, LOW);

  }


}