#include <Adafruit_SSD1306.h>
#include <WiFi.h>
#include <WiFiUdp.h>
#include <NTPClient.h> 
#include <TimeLib.h> 

#define SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 64 

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

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

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP);

int last_second;

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while ( WiFi.status() != WL_CONNECTED ) {
    delay ( 500 );
    Serial.print ( "." );
  }
  timeClient.begin();

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
 
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 1);
  display.println("Senin 27/9/2021");
  
  display.setTextSize(4);
  display.setTextColor(WHITE);
  display.setCursor(0, 20);
  display.println("13:20");
  
  display.display(); 
}

void loop() {
  timeClient.update();
  //Serial.println(timeClient.getFormattedTime());
  //Serial.println(timeClient.getEpochTime());
  unsigned long rawTime = timeClient.getEpochTime() + 25200;

  if (rawTime != last_second){
  time_t t = rawTime;
 
  int jam = hour(t);
  String jamStr = jam < 10 ? "0" + String(jam) : String(jam);
  int menit = minute(t);
  String menitStr = menit < 10 ? "0" + String(menit) : String(menit);
  int detik = second(t);
  String detikStr = detik < 10 ? "0" + String(detik) : String(detik);
    
  String hari;
  switch (weekday(t)){
    case 1 :
      hari = "Minggu";
      break;
    case 2 :
      hari = "Senin";
      break;
    case 3 :
      hari = "Selasa";
      break;
    case 4 :
      hari = "Rabu";
      break;
    case 5 :
      hari = "Kamis";
      break;
    case 6 :
      hari = "Jumat";
      break;
    case 7 :
      hari = "Sabtu";
      break;
    }
  int tgl = day(t);
  String tglStr = tgl < 10 ? "0" + String(tgl) : String(tgl);
  int bln = month(t);
  String blnStr = bln < 10 ? "0" + String(bln) : String(bln);
  int thn = year(t);
  String thnStr = String(thn);

  String tanggal = hari + " " + tglStr + "/" + blnStr + "/" + thnStr;
  String waktu = jamStr + ":" + menitStr + ":" + detikStr;

  Serial.println(tanggal);
  Serial.println(waktu);
  display.clearDisplay();
 
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 1);
  display.println(tanggal);
  
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0, 20);
  display.println(waktu);
  
  display.display(); 
  delay(100);
  last_second = rawTime;
  }
}