#include <WiFi.h>
#include <Wire.h>
#include <DHT_U.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

#define NTP_SERVER "sg.pool.ntp.org"
// DHT parameters
#define DHTTYPE    DHT22     // DHT 11
#define DHTPIN 12
DHT_Unified dht(DHTPIN, DHTTYPE);
uint32_t delayMS;

// Parameters for using non-blocking delay
unsigned long previousMillis = 0;
const long interval = 1000;
String msgStr = "";      // MQTT message buffer
float temp, hum;

void spinner() {
  static int8_t counter = 0;
  const char* glyphs = "\xa1\xa5\xdb";
  LCD.setCursor(15, 1);
  LCD.print(glyphs[counter++]);
  if (counter == strlen(glyphs)) {
    counter = 0;
  }
}

void printTemHum() {
  unsigned long currentMillis = millis(); // Read current time
  if (currentMillis - previousMillis >= interval) { // If current time - last time > 5 sec
    previousMillis = currentMillis;
    // Read temperature and humidity
    sensors_event_t event;
    dht.temperature().getEvent(&event);
    if (isnan(event.temperature)) {
      Serial.println(F("Error reading temperature!"));
    }
    else {
      Serial.print(F("Temperature: "));
      temp = event.temperature;
      Serial.print(temp);
      Serial.println(F("°C"));
    }
    // Get humidity event and print its value
    dht.humidity().getEvent(&event);
    if (isnan(event.relative_humidity)) {
      Serial.println(F("Error reading humidity!"));
    }
    else {
      Serial.print(F("Humidity: "));
      hum = event.relative_humidity;
      Serial.print(hum);
      Serial.println(F("%"));
      LCD.setCursor(0, 0);
      LCD.print("Humidity:");
      LCD.print(hum);
      LCD.print("%");

      LCD.setCursor(0, 1);
      LCD.print("Temperature:");
      LCD.print(temp);
      LCD.print("C");
    }
    }
    
}

void setup() {
  Serial.begin(115200);
  
  // Initialize device.
  dht.begin();
  // Get temperature sensor details.
  sensor_t sensor;
  dht.temperature().getSensor(&sensor);
  dht.humidity().getSensor(&sensor);

  LCD.init();
  LCD.backlight();
  LCD.setCursor(0, 0);
  LCD.print("Connecting to ");
  LCD.setCursor(0, 1);
  LCD.print("WiFi ");

  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(250);
    spinner();
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  LCD.clear();
  

  // Manually set the UTC offset for Singapore (UTC+8, no daylight saving time)
  configTime(8 * 3600, 0, NTP_SERVER);
}

void loop() {
  printTemHum();
  

  delay(250);
}