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

#define buzzer 7

RTC_DS3231 rtc;

LiquidCrystal_I2C lcd(0x27, 16, 2); 

// Tone for buzzer
int song[] = {500, 1000, 250, 750, 700, 600, 400, 550, 220, 800};
// Duration of the buzzer
int durasi[] = {100, 200, 100, 200, 100, 200, 100, 200, 100, 200};

char seminggu[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

void setup() {
  lcd.begin(16, 2);
  lcd.backlight();

  if (!rtc.begin()) {
    lcd.print("Tidak dapat menemukan RTC");
    while (1);
  }

  if (rtc.lostPower()) {
    lcd.print("RTC kehilangan daya, Atur waktu!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  pinMode(buzzer, OUTPUT);
  while (!Serial);
  Serial.begin(57600);

}

void alarm(int tgl_alarm, int jam_alarm, int mnt_alarm) {
  DateTime now = rtc.now();
  int day = now.day();
  int jam = now.hour();
  int menit = now.minute();

  if (tgl_alarm == day) {
    if (jam_alarm == jam) {
      if (mnt_alarm == menit) {
        for (int note = 0; note < 10; note++) {
          tone(buzzer, song[note], durasi[note]);
          delay(durasi[note]);
          Serial.println("ALARM BUNYI!!");
        }
      }
    }
  }
  delay(1000);
}

void loop() {
  DateTime now = rtc.now();

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  lcd.print(formatDigits(now.hour()));
  lcd.print(":");
  lcd.print(formatDigits(now.minute()));
  lcd.print(":");
  lcd.print(formatDigits(now.second()));

  lcd.setCursor(0, 1);
  lcd.print("Date: ");
  lcd.print(formatDigits(now.day()));
  lcd.print("/");
  lcd.print(formatDigits(now.month()));
  lcd.print("/");
  lcd.print(now.year());

  delay(1000); 

  Serial.print(now.year(), DEC);
  Serial.print('/');
  Serial.print(now.month(), DEC);
  Serial.print('/');
  Serial.print(now.day(), DEC);
  Serial.print(" (");
  Serial.print(seminggu[now.dayOfTheWeek()]);
  Serial.print(") ");
  Serial.print(now.hour(), DEC);
  Serial.print(':');
  Serial.print(now.minute(), DEC);
  Serial.print(':');
  Serial.println(now.second(), DEC);
  
  delay(1000);

  // Set alarm (Tanggal, Jam, Menit)
  alarm(29, 9, 19);
}

String formatDigits(int digits) {
  if (digits < 10) {
    return "0" + String(digits);
  } else {
    return String(digits);
  }
}