const byte butPins[9] = {9, 8, 10};

#define monoPin 7
#define audioPin 6

const int butTimer = 300;
uint64_t lastButTimers[3]; // = {0, 0, 0};
byte lastButStates[3];

bool warning = false;
const long warningTimer = 15000;
const long offTimer = 30000;
uint64_t lastWarningTime;
uint64_t lastOffTime;

bool pusk = false;
bool expec = false;

void setup() {
  Serial.begin(9600);
  
  for(byte i {0}; i < 3; i++) {
    pinMode(butPins[i], INPUT_PULLUP);
  }
  pinMode(monoPin, INPUT);
  pinMode(audioPin, OUTPUT);
}

void loop() {
  for(byte i {0}; i < 3; i++) {
    checkBut(i);
  }

  if(pusk && digitalRead(monoPin) == LOW) {
    delay(100);
    digitalWrite(audioPin, HIGH);
    Serial.write(3);
    Serial.read();
    lastWarningTime = millis();
    expec = true;
    while(expec) {
      if(Serial.available()) {
        expec = false;
      }
      
      if (millis() - lastWarningTime > warningTimer && !warning) {
        warning = true;
        lastOffTime = millis();
        Serial.println(4);
        Serial.write(4);
        Serial.read();
      }
      else if(millis() - lastOffTime > offTimer && warning) {
        warning = false;
        expec = false;
        Serial.write(5);
        Serial.println(5);
        Serial.read();
      }
    }
    Serial.read();
    pusk = false;
    digitalWrite(audioPin, LOW);
  }

}

void checkBut(byte i) {
  byte butState = digitalRead(butPins[i]);
  if(butState == LOW && butState != lastButStates[i]) {
    if (millis() - lastButTimers[i] > butTimer) {
      lastButTimers[i] = millis();
      Serial.println(i);
      Serial.write(i);
      Serial.read();
      if(i == 2) {
        pusk = true;
      }
    }
  }
  lastButStates[i] = butState;
}