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

RTC_DS3231 rtc;
char daysOfTheWeek[7][12] = {"Minggu", "Senin", "Selasa", "Rabu", "Kamis", "Jumat", "Sabtu"};
int jam, menit, detik;
int tanggal, bulan, tahun;
String hari;
#define BUZZER_PIN 8 

LiquidCrystal_I2C lcd(0x27, 16, 2); 

// Definisi nada
#define Do 262
#define Re 294
#define Mi 330
#define Fa 349
#define So 392
#define La 440
#define Si 494
#define Do2 523
#define Re2 587
#define Mi2 659
#define Fa2 698
#define So2 784
#define La2 880
#define Si2 988

void setup() {
  Serial.begin(9600);
  lcd.init();                 
  lcd.backlight();                
  lcd.setCursor(0, 0);
  lcd.print("PKL: 00:00");       
  lcd.setCursor(0, 1);          
  lcd.print("Tanggal...");        

  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }

  if (rtc.lostPower()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  pinMode(BUZZER_PIN, OUTPUT);
}

void loop() {
  DateTime now = rtc.now();
  jam     = now.hour();
  menit   = now.minute();
  detik   = now.second();
  tanggal = now.day();
  bulan   = now.month();
  tahun   = now.year();
  hari    = daysOfTheWeek[now.dayOfTheWeek()];

  // Update jam di LCD
  lcd.setCursor(5, 0);
  lcd.print(String(jam) + ":" + String(menit) + ":" + String(detik));

  // Format dan tampilkan tanggal
  char tanggalLengkap[16];
  sprintf(tanggalLengkap, "%02d-%02d-%04d", tanggal, bulan, tahun);
  lcd.setCursor(0, 1); 
  lcd.print(hari + " "); 
  lcd.print(tanggalLengkap); 

  // Bunyikan buzzer setiap 15 detik
  if (detik % 15 == 0) {
    alarm(); 
  }
  
  delay(1000);
}

void alarm() {
  int lagu[] = {
    Do2, Do2, Do2, Do2, Do2, Si, La, Do2, Si, La, So, 
    So, Re2, Re2, Re2, Re2, Re2, Do2, Re2, Mi2, Fa2, Mi2, Re2, Do2,
    Do2, Do2, Do2, Do2, Do2, Si, La, Do2, Si, La, So, 
    So, Re2, Re2, Re2, Re2, Re2, Do2, Re2, Mi2, Fa2, Mi2, Re2, Do2,
    Fa2, Fa2, Fa2, Fa2, Fa2, La2, La2, Mi2, Mi2, Mi2, Mi2, Mi2, So2, So2,
    Re2, Re2, Re2, Re2, Re2, Do2, Re2, Mi2, Fa2, Mi2, Re2, Do2,
    Fa2, Fa2, Fa2, Fa2, Fa2, La2, La2, Mi2, Mi2, Mi2, Mi2, Mi2, So2, So2,
    Re2, Re2, Re2, Re2, Re2, Do2, Re2, Mi2, Fa2, Mi2, Re2, Do2
  }; // Lagu "Anak Kambing Saya"

  int tempo[] = {
    100,100,100,100,150,100,100,100,100,100,150,
    100,100,100,100,100,150,100,100,100,100,100,
    100,200,
    100,100,100,100,150,100,100,100,100,100,150,
    100,100,100,100,100,150,100,100,100,100,100,
    100,200,
    100,100,100,100,100,100,150,
    100,100,100,100,100,100,150,
    100,100,100,100,150,100,100,100,100,100,100,150,
    100,100,100,100,100,100,150,
    100,100,100,100,100,100,150,
    100,100,100,100,150,100,100,100,100,100,100,150
  };

  int j = sizeof(lagu) / sizeof(lagu[0]);

  for (int i = 0; i < j; i++) {
    tone(BUZZER_PIN, lagu[i]); // Mainkan nada
    delay(tempo[i]);           // Tunggu sesuai tempo
    noTone(BUZZER_PIN);        // Matikan nada
    delay(100);                // Jeda antar nada
}
}