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

// Define OLED display size
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// Create RTC object
RTC_DS3231 rtc;

// Array of day names in Indonesian
const char* daysOfTheWeek[] = {"Minggu", "Senin", "Selasa", "Rabu", "Kamis", "Jumat", "Sabtu"};

void setup() {
  // Initialize serial communication (optional)
  Serial.begin(9600);

  // Initialize OLED display with I2C address 0x3C
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  
  // Clear the buffer
  display.clearDisplay();
  display.display();

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

  if (rtc.lostPower()) {
    Serial.println("RTC lost power, let's set the time!");
    // When the RTC loses power, set the time to the compile time
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
}

void loop() {
  // Get the current date and time from the RTC
  DateTime now = rtc.now();
  
  // Clear the display
  display.clearDisplay();

  // Set text color to white (since OLED is monochrome)
  display.setTextColor(SSD1306_WHITE);

  // Display the day of the week in small size at the top
  display.setTextSize(1); // Smaller text size
  display.setCursor(47, 37);
  display.print(daysOfTheWeek[now.dayOfTheWeek()]);

  // Display the date in small size below the day of the week
  display.setCursor(40, 50);
  display.print(now.day());
  display.print('/');
  display.print(now.month());
  display.print('/');
  display.print(now.year());

  // Display the time in large size
  display.setTextSize(3); // Larger text size
  display.setCursor(18, 8); // Adjust as needed to center the time
  if (now.hour() < 10) display.print('0'); // Leading zero for hours
  display.print(now.hour());
  display.print(':');
  if (now.minute() < 10) display.print('0'); // Leading zero for minutes
  display.print(now.minute());

  // Display the buffer
  display.display();

  // Delay for a second before updating the time again
  delay(1000);
}