#include <Wire.h>
#include <LiquidCrystal_I2C.h> 

LiquidCrystal_I2C lcd(0x27, 20, 4); 

const int segA = 2;
const int segB = 3;
const int segC = 4;
const int segD = 5;
const int segE = 6;
const int segF = 7;
const int segG = 8;

const int buzzerPin = 9;

int melody[] = {
  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
};

int noteDurations[] = {
  4, 8, 4, 4, 4, 2,
  4, 8, 4, 4, 4, 2,
  4, 8, 4, 4, 4, 4, 2,
  4, 8, 4, 4, 4, 2
};

// Tabel tampilan 7-segment untuk angka 3, 2, 1, 0
const byte digit[4] = {
  0b0111111,   // 0
  0b0000110,   // 1
  0b1011011,   // 2
  0b1001111    // 3
};

unsigned long previousMillisBuzzer = 0;
unsigned long previousMillisScroll = 0;
unsigned long intervalBuzzer = 500;
unsigned long intervalScroll = 200;
int currentNote = 0;
bool buzzerPlaying = false;

void displayDigit(int number) {
  byte segments = digit[number];
  digitalWrite(segA, segments & 0b00000001);
  digitalWrite(segB, segments & 0b00000010);
  digitalWrite(segC, segments & 0b00000100);
  digitalWrite(segD, segments & 0b00001000);
  digitalWrite(segE, segments & 0b00010000);
  digitalWrite(segF, segments & 0b00100000);
  digitalWrite(segG, segments & 0b01000000);
}

void setup() {
  pinMode(segA, OUTPUT);
  pinMode(segB, OUTPUT);
  pinMode(segC, OUTPUT);
  pinMode(segD, OUTPUT);
  pinMode(segE, OUTPUT);
  pinMode(segF, OUTPUT);
  pinMode(segG, OUTPUT);

  pinMode(buzzerPin, OUTPUT);

  lcd.init();
  lcd.backlight();

  for (int i = 3; i >= 0; i--) {
    displayDigit(i);
    delay(1000);  
  }

  buzzerPlaying = true;
}

void loop() {
  unsigned long currentMillis = millis();

  if (buzzerPlaying) {
    if (currentMillis - previousMillisBuzzer >= intervalBuzzer) {
      previousMillisBuzzer = currentMillis;

      int noteDuration = 1000 / noteDurations[currentNote];
      tone(buzzerPin, melody[currentNote], noteDuration);
      delay(noteDuration); 

      currentNote++;
      if (currentNote >= sizeof(melody) / sizeof(melody[0])) {
        buzzerPlaying = false;  
        noTone(buzzerPin);
      }
    }
  }

  if (currentMillis - previousMillisScroll >= intervalScroll) {
    previousMillisScroll = currentMillis;

    lcd.setCursor(15, 0);
             //012345678912345
    lcd.print("Yaumul Milad ");
    lcd.setCursor(15, 1);
    lcd.print("Barakallahu Fii Umrik");

    lcd.scrollDisplayLeft();
  }

  if (!buzzerPlaying && currentMillis - previousMillisScroll >= intervalScroll) {
    previousMillisScroll = currentMillis;
    lcd.scrollDisplayLeft();  
  }
}