#include <WiFi.h>
#include <WiFiUdp.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
#define SCREEN_ADDRESS 0x3C

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

const char *ssid = "Wokwi-GUEST";
const char *password = "";

const char *ntpServer = "pool.ntp.org"; // Server NTP untuk WIB (Waktu Indonesia Barat)
const long gmtOffset_sec = 7 * 3600; // WIB (UTC + 7 hours)
const int daylightOffset_sec = 0;

void setup() {
  Serial.begin(115200);
  
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);

  // Connect to WiFi
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi..");
  display.print("Connecting to wiFi..");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
    display.print(".");
    display.display();
  }
  Serial.println("Connected!");

  // Initialize and set the system time using NTP
  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
}

void loop() {
  display.clearDisplay();
  display.setCursor(0,0);

  // Get current time
  struct tm timeinfo;
  if(!getLocalTime(&timeinfo)){
    Serial.println("Failed to obtain time");
    return;
  }

  // Print time
  char timeString[20];
  strftime(timeString, sizeof(timeString), "%H:%M:%S", &timeinfo);
  display.println(timeString);

  // Print date
  char dateString[20];
  strftime(dateString, sizeof(dateString), "%A, %d %B %Y", &timeinfo);
  display.println(dateString);

  display.display();
  delay(1000); // Update once per second
}