#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include <WiFi.h>
#include <NTPClient.h>
#include <WiFiUdp.h>

#define DHTPIN 4
#define DHTTYPE DHT11

LiquidCrystal_I2C lcd(0x27, 16, 2);
DHT dht(DHTPIN, DHTTYPE);

unsigned long previousMillis = 0;
bool showTempHumidity = false; // Memulai dengan menampilkan tanggal dan waktu

// WiFi credentials
const char* ssid = "B66";
const char* password = "M9RHEJN5";

// NTP configuration
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org", 28800, 60000); // UTC+8 (WITA)

// Array nama hari dalam bahasa Indonesia
const char* days[] = {"Minggu", "Senin", "Selasa", "Rabu", "Kamis", "Jumat", "Sabtu"};

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  dht.begin();

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

  // Start NTP client
  timeClient.begin();
}

void loop() {
  timeClient.update();
  unsigned long currentMillis = millis();
  
  // Cek apakah sudah 5 detik berlalu
  if (currentMillis - previousMillis >= 5000) {
    previousMillis = currentMillis;
    showTempHumidity = !showTempHumidity; // Bergantian antara tanggal dan suhu/kelembapan
  }

  if (showTempHumidity) {
    // Tampilkan Suhu dan Kelembapan
    float temperature = dht.readTemperature();
    float humidity = dht.readHumidity();
    
    lcd.setCursor(0, 0);
    if (isnan(temperature) || isnan(humidity)) {
      lcd.print("Error membaca DHT");
    } else {
      lcd.print("Suhu: ");
      lcd.print(temperature, 0);
      lcd.print((char)223); // Simbol derajat
      lcd.print("C ");
      lcd.print(humidity, 0);
      lcd.print("%  ");
    }
  } else {
    // Ambil data waktu dari NTP
    time_t rawTime = timeClient.getEpochTime();
    struct tm *timeInfo = localtime(&rawTime);
    
    // Format nama hari + tanggal "Senin 4-3-2025"
    lcd.setCursor(0, 0);
    lcd.print(days[timeInfo->tm_wday]);
    lcd.print(" ");
    lcd.print(timeInfo->tm_mday);
    lcd.print("-");
    lcd.print(timeInfo->tm_mon + 1);
    lcd.print("-2025   ");
  }

  // Tampilkan waktu di baris kedua (konstan)
  lcd.setCursor(0, 1);
  lcd.print("Waktu: ");
  lcd.print(timeClient.getHours());
  lcd.print(":");
  lcd.print(timeClient.getMinutes());
  lcd.print(":");
  lcd.print(timeClient.getSeconds());
  lcd.print("   ");
  
  delay(1000); // Perbarui setiap detik
}