#include <Wire.h>
#include <RTClib.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"));
    for(;;);
  }
}

String Day(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 MonthDayYearText;
  if (Month==1)  MonthDayYearText="JAN ";
  if (Month==2)  MonthDayYearText="FEB ";
  if (Month==3)  MonthDayYearText="MAR ";
  if (Month==4)  MonthDayYearText="APR ";
  if (Month==5)  MonthDayYearText="MAY ";
  if (Month==6)  MonthDayYearText="JUN ";
  if (Month==7)  MonthDayYearText="JUL ";
  if (Month==8)  MonthDayYearText="AUG ";
  if (Month==9)  MonthDayYearText="SEP ";
  if (Month==10)  MonthDayYearText="OCT ";
  if (Month==11)  MonthDayYearText="NOV ";
  if (Month==12)  MonthDayYearText="DEC ";
  
  MonthDayYearText=MonthDayYearText+Day;
  if (Day==1)MonthDayYearText=MonthDayYearText+"st ";
  if (Day==2)MonthDayYearText=MonthDayYearText+"nd ";
  if (Day>2)MonthDayYearText=MonthDayYearText+"th ";

  MonthDayYearText=MonthDayYearText+Year;
  return MonthDayYearText;
}

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

String HourMinute(uint8_t h, uint8_t i ){
  String HourMinuteText="";
  HourMinuteText=HourMinuteText + Second(h) +":"+Second(i);
  return HourMinuteText;
}

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(1, 1);
  display.setTextSize(2);
  display.setTextColor(SSD1306_BLACK);
  display.print(Day(now.dayOfTheWeek()));

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

  display.setCursor(15, 30);
  display.setTextSize(2);
  display.setTextColor(SSD1306_BLACK);
  display.print(HourMinute(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(Second(now.second()));

  display.setCursor(0, 48);
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.println("Temp");

  display.setCursor(25, 48);
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.print(temperature);
  display.setCursor(56, 46);
  display.setTextSize(1);
  display.print("o");

  display.setCursor(64, 48);
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.println("Humi");

  display.setCursor(90, 48);
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.print(humidity);
  display.setCursor(121, 47);
  display.setTextSize(1);
  display.print("%");

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