#include <Arduino.h>
#include <Bounce2.h> // https://github.com/thomasfredericks/Bounce2/archive/refs/heads/master.zip

Bounce2::Button button = Bounce2::Button();

const int buttonPin = 4;
const int ledPin =  LED_BUILTIN;

byte step = 0;
int counter;
int counterLimit = 10;
bool start = false;

unsigned long previousMillis = 0;

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

  Serial.println("Please enter your name:");

  button.attach(buttonPin, INPUT_PULLUP);
  button.interval(5); // interval im ms
  button.setPressedState(LOW);
}

void loop()
{
  button.update();

  if (button.pressed())
  {
    if(step == 1)
    {
      counter = 0;
      step = 2;
      counterLimit = 20;
      start = true;
      previousMillis = millis();
      Serial.println("Starting countdown 2");
      Serial.println(counterLimit - counter);
    }
    else
    {
      counter = 0;
      step = 1;
      counterLimit = 10;
      start = true;
      previousMillis = millis();
      Serial.println("Starting countdown 1");
      Serial.println(counterLimit - counter);
    }
  }

  switch (step)
  {
    case 0:
      break;

    case 1:
      if ((millis() - previousMillis >= 1000) && (start == true))
      {
        counter++;
        previousMillis = millis();
        Serial.println(counterLimit - counter);
      }
      if((counter == counterLimit) && (start == true))
      {
        start = false;
        Serial.println("Done 1!");
      }
      break;
    case 2:
      if ((millis() - previousMillis >= 1000) && (start == true))
      {
        counter++;
        previousMillis = millis();
        Serial.println(counterLimit - counter);
      }
      if((counter == counterLimit) && (start == true))
      {
        start = false;
        Serial.println("Done 2!");
      }
      break;
    default:
      break;
  }
}