#include <Wire.h>
#include <RTClib.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

RTC_DS3231 rtc;
DHT dht(2, DHT22);

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  Serial.begin(9600);
  
  if (!rtc.begin()) {
    Serial.println("Tidak dapat menemukan RTC DS3231. Pastikan koneksi sudah benar!");
    while (1);
  }

  if (rtc.lostPower()) {
    Serial.println("RTC kehilangan daya. Atur waktu RTC terlebih dahulu.");
  }

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
  }
  display.display();
    delay(2000); 

  display.clearDisplay(); 
  display.display();
  dht.begin();
}

String DayOfTheWeek(uint8_t Day){
  String DayText;
  if (Day==1)  DayText="Monday";
  if (Day==2)  DayText="Tuesday";
  if (Day==3)  DayText="Wednesday";
  if (Day==4)  DayText="Thursday";
  if (Day==5)  DayText="Friday";
  if (Day==6)  DayText="Saturday";
  if (Day==7)  DayText="Sunday";
  return DayText;
}

String DayMonthYear(uint8_t Day,uint8_t Month,uint16_t Year){
  String DayMonthYearText;
  if (Month==1)  DayMonthYearText="JAN ";
  if (Month==2)  DayMonthYearText="FEB ";
  if (Month==3)  DayMonthYearText="MAR ";
  if (Month==4)  DayMonthYearText="APR ";
  if (Month==5)  DayMonthYearText="MAY ";
  if (Month==6)  DayMonthYearText="JUN ";
  if (Month==7)  DayMonthYearText="JUL ";
  if (Month==8)  DayMonthYearText="AUG ";
  if (Month==9)  DayMonthYearText="SEP ";
  if (Month==10)  DayMonthYearText="OCT ";
  if (Month==11)  DayMonthYearText="NOV ";
  if (Month==12)  DayMonthYearText="DEC ";

  DayMonthYearText=DayMonthYearText+Day;
  if (Day==1)DayMonthYearText=DayMonthYearText+"st ";
  if (Day==2)DayMonthYearText=DayMonthYearText+"nd ";
  if (Day>2)DayMonthYearText=DayMonthYearText+"th ";

  DayMonthYearText=DayMonthYearText+Year;
  
  return DayMonthYearText;
}

String AddLeadingZero(uint8_t x){
  String AddLeadingZeroText;
  if(x<10) AddLeadingZeroText="0"; 
  else AddLeadingZeroText=""; 
  AddLeadingZeroText=AddLeadingZeroText+x;
  return AddLeadingZeroText;
}

String CurrentTime(uint8_t h, uint8_t i ){
  String CurrentTimeText="";
  CurrentTimeText=CurrentTimeText + AddLeadingZero(h) +":"+AddLeadingZero(i);
  return CurrentTimeText;
}

void loop() {
  DateTime now = rtc.now();
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  display.fillRect(0, 0, 128, 16, SSD1306_WHITE);
  display.fillRect(0, 16, 128, 28, SSD1306_BLACK);
  display.fillRect(0, 28, 128, 46, SSD1306_WHITE);
  display.fillRect(0, 46, 128, 64, SSD1306_BLACK);

  display.setCursor(15, 1);
  display.setTextSize(2);
  display.setTextColor(SSD1306_BLACK);
  display.println(DayOfTheWeek(now.dayOfTheWeek()));

  display.setCursor(1, 18);
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.println(DayMonthYear(now.day(), now.month(), now.year()));

  display.setCursor(15, 30);
  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE);
  display.println(CurrentTime(now.hour(), now.minute()));

  display.setCursor(75, 30);
  display.setTextSize(2);
  display.setTextColor(SSD1306_BLACK);
  display.println(":");

  display.setCursor(87, 30);
  display.setTextSize(2);
  display.setTextColor(SSD1306_BLACK);
  display.println(AddLeadingZero(now.second()));

  display.setCursor(2, 48);
  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE);
  display.println("Temp");

  display.setCursor(55, 48);
  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE);
  display.print(temperature);
  display.setCursor(116, 46);
  display.setTextSize(1);
  display.print("o");

  display.display();
  delay(1000);
}