#include <WiFi.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <NTPClient.h>
#include <DHT.h>

#define SCREEN_WIDTH 128 // Lebar layar OLED (piksel)
#define SCREEN_HEIGHT 64 // Tinggi layar OLED (piksel)
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define NTP_SERVER "pool.ntp.org" // Server NTP
#define UTC_OFFSET 7 // Setting zona waktu, WIB = UTC+7
#define UTC_OFFSET_DST 0 // Daylight Saving Time

const char *ssid = "Wokwi-GUEST"; // Nama WiFi
const char *password = ""; // Kata sandi WiFi
const long utcOffsetInSeconds = 25200; // UTC offset untuk GMT+7 (WIB)
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, NTP_SERVER, utcOffsetInSeconds);

bool wifiConnected = false;

#define DHT_PIN 18     // Pin DHT22 terhubung ke pin GPIO 4 (atau D2 pada ESP32)
#define DHT_TYPE DHT22   // Tipe sensor DHT

DHT dht(DHT_PIN, DHT_TYPE);

void setup() {
  Serial.begin(115200);
  
  // Inisialisasi layar OLED
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);

  // Tampilkan informasi nama, NIM, dan kelas
  display.println("Name: Dia Dicksy A");
  display.println("NIM: 210411100079");
  display.println("Class: IoT - 2");
  display.display();
  delay(2000);

  // Tampilkan pesan "Connecting WiFi..."
  display.clearDisplay();
  display.setCursor(0,0);
  display.println("Connecting WiFi...");
  display.display();

  // Koneksi WiFi
  WiFi.begin(ssid, password);
  dht.begin();
}

void loop() {
  if (!wifiConnected) {
    // Tunggu hingga koneksi WiFi berhasil
    if (WiFi.status() == WL_CONNECTED) {
      Serial.println("Connected");
      Serial.print("IP Address: ");
      Serial.println(WiFi.localIP());
      wifiConnected = true;
      display.clearDisplay();
      display.println("Online");
      display.println("Updating Time...");
      display.display();
      delay(1000);
      // Mulai sinkronisasi waktu dengan server NTP
      configTime(UTC_OFFSET * 3600, UTC_OFFSET_DST * 3600, NTP_SERVER);
    }
    delay(500);
  }
  else {
    struct tm timeinfo;
    if (!getLocalTime(&timeinfo)) {
      Serial.println("Failed to obtain time");
      return;
    }

    // Tampilkan waktu dan tanggal pada layar OLED
    display.clearDisplay();
    display.setCursor(0, 20);
    display.print("Online ");
    display.setCursor(70, 20);
    display.println(&timeinfo, "%H:%M:%S");
    display.setCursor(70, 30);
    display.print(" WIB ");
    display.setCursor(0, 30);
    display.print("");
    display.println(&timeinfo, "%d/%m/%Y");

    display.display();
    delay(2000); // Tampilkan data setiap 2 detik

    // Baca data suhu dan kelembaban dari sensor DHT22
    display.clearDisplay();
    float tempC = dht.readTemperature();
    float humidity = dht.readHumidity();
    float tempF = (tempC * 9/5) + 32;
    float tempK = tempC + 273.15;

    display.setTextSize(1);
    display.setTextColor(SSD1306_WHITE);
    display.setCursor(0, 0);
    display.println("Celcius : " + String(tempC) + " C");
    display.println("Farenheit : " + String(tempF) + " F");
    display.println("Kelvin : " + String(tempK) + " K");
    display.println("Humidity: " + String(humidity) + " %");
    display.display();
    delay(2000);


  }
}