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

RTC_DS1307 rtc;

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

// Alamat I2C LCD
#define I2C_ADDR 0x27

// Jumlah kolom dan baris LCD
#define LCD_COLS 16
#define LCD_ROWS 2

// Inisialisasi LCD
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLS, LCD_ROWS);

void setup() {
  while (!Serial); // for Leonardo/Micro/Zero
  Serial.begin(57600);
  
  // Inisialisasi LCD
  lcd.begin(LCD_COLS, LCD_ROWS);
  lcd.backlight();  // Nyalakan backlight jika ada
  lcd.clear();      // Bersihkan tampilan LCD

  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }
  
  if (!rtc.isrunning()) {
    Serial.println("RTC is NOT running!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0)); // Example: set a specific date and time
  }
}

void loop() {
  DateTime now = rtc.now();
  
  // Menampilkan ke Serial Monitor
  Serial.print(now.year(), DEC);
  Serial.print('/');
  Serial.print(now.month(), DEC);
  Serial.print('/');
  Serial.print(now.day(), DEC);
  Serial.print(" (");
  Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
  Serial.print(") ");
  Serial.print(now.hour(), DEC);
  Serial.print(':');
  Serial.print(now.minute(), DEC);
  Serial.print(':');
  Serial.print(now.second(), DEC);
  Serial.println();
  
  Serial.print(" since midnight 15/11/2023 = ");
  Serial.print(now.unixtime());
  Serial.print("s = ");
  Serial.print(now.unixtime() / 86400L);
  Serial.println("d");
  
  DateTime future = now + TimeSpan(7, 12, 30, 6);
  Serial.print(" now + 7d + 30s: ");
  Serial.print(future.year(), DEC);
  Serial.print('/');
  Serial.print(future.month(), DEC);
  Serial.print('/');
  Serial.print(future.day(), DEC);
  Serial.print(' ');
  Serial.print(future.hour(), DEC);
  Serial.print(':');
  Serial.print(future.minute(), DEC);
  Serial.print(':');
  Serial.print(future.second(), DEC);
  Serial.println();
  
  // Menampilkan ke LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Date: ");
  lcd.print(now.year(), DEC);
  lcd.print('/');
  lcd.print(now.month(), DEC);
  lcd.print('/');
  lcd.print(now.day(), DEC);
  
  lcd.setCursor(0, 1);
  lcd.print("Time: ");
  lcd.print(now.hour(), DEC);
  lcd.print(':');
  lcd.print(now.minute(), DEC);
  lcd.print(':');
  lcd.print(now.second(), DEC);
  
  delay(3000);
}