#define POT A0

#define BTN1 11
#define BTN2 12
#define BTN3 13

#define BUZ1 9
#define BUZ2 10
#define LED A1

// Define pins for seven-segment display
const byte sevseg[] = {7, 8, 2, 3, 4, 6, 5};

bool btn1Pressed = false;
byte angka = 0;
bool bunyi = false;

void setup() {
  Serial.begin(9600);
   // Clear the serial monitor
  Serial.flush();

  // Move the cursor to the specified position
  Serial.println("AFIS");   // AFIS on the first line
  Serial.println("21650096");  // 21650096 on the second line

  pinMode(BTN1, INPUT_PULLUP);
  pinMode(BTN2, INPUT_PULLUP);
  pinMode(BTN3, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
  pinMode(BUZ1, OUTPUT);
  pinMode(BUZ2, OUTPUT);

  // Set up pins for seven-segment display
  for (byte i : sevseg) {
    pinMode(i, OUTPUT);
    digitalWrite(i, HIGH);
  }

  attachInterrupt(digitalPinToInterrupt(BTN3), tombolInterrupt, RISING);
}

void loop() {
  bool btn1 = digitalRead(BTN1);
  bool btn2 = digitalRead(BTN2);
  bool btn3 = digitalRead(BTN3);

  // Check if BTN1 is pressed
  if (btn1 == LOW) {
    delay(250);
    int notes[] = {262, 262, 294, 262, 349, 330, 262, 262, 294, 262, 392, 349, 262, 262, 523, 440, 349, 330, 294, 466, 466, 440, 349, 392, 349, 262, 262, 294, 262, 349, 330, 262, 262, 294, 262, 392, 349, 330};
    int duration[] = {250, 250, 500, 500, 500, 500, 250, 250, 500, 500, 500, 500, 250, 250, 500, 500, 500, 500, 500, 500, 250, 250, 500, 500, 500, 500, 250, 250, 500, 500, 500, 500, 250, 250, 500, 500, 500, 500, 250, 250, 500};
    
    for (int i = 0; i < sizeof(notes) / sizeof(notes[0]); i++) {
      tone(BUZ2, notes[i], duration[i]);
      delay(duration[i] + 50); // add a small delay between notes
      tampilAngka(angka);
      angka = (angka + 1) % 10;
    }
    noTone(BUZ2); // Stop the buzzer
    matikan();
    bunyi = false;
  }

  // Check if BTN2 is pressed
  if (btn2 == LOW) {
    delay(250);
    // Blink the LED
    digitalWrite(LED, HIGH);
    delay(500);
    digitalWrite(LED, LOW);
    delay(500);
    bunyi = false;
  }

  // Check if BTN3 is pressed
  if (btn3 == LOW) {
    delay(250);
    bunyi = !bunyi;
    
    digitalWrite(LED, HIGH);    
    delay(300);
    digitalWrite(LED, LOW);
  }

  if (bunyi) {
    int mq = analogRead(POT);
    mq = map(mq, 0, 1023, 0, 100);

    Serial.print("Intensitas Gas: ");
    Serial.print(mq);
    Serial.println("%");

    if (mq < 50) return;

    tone(BUZ1, 200);
    delay(100);
    noTone(BUZ1);
    delay(300);
  }

  delay(100);
}

void tombolInterrupt() {
  bunyi = false;
}

void tampilAngka(byte num) {
 switch (num) {
    case 1: nyalakan("bc"); break;    
    case 2: nyalakan("abdeg"); break;    
    case 3: nyalakan("abcdg"); break;    
    case 4: nyalakan("bcfg"); break;    
    case 5: nyalakan("acdfg"); break;    
    case 6: nyalakan("acdefg"); break;    
    case 7: nyalakan("abc"); break;    
    case 8: nyalakan("abcdefg"); break;    
    case 9: nyalakan("abcdfg"); break;    
    default: nyalakan("abcdef"); break;
  }
}

void nyalakan(String l) {
  matikan();

  for (char c : l)
    digitalWrite(sevseg[convertToNumber(c)], LOW);
}

void matikan() {
  for (byte e : sevseg)
    digitalWrite(e, HIGH);
}

int convertToNumber(char input) {
  switch (input) {
    case 'a': return 0;
    case 'b': return 1;
    case 'c': return 2;
    case 'd': return 3;
    case 'e': return 4;
    case 'f': return 5;
    case 'g': return 6;
  }
}