// Display Setup
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4); // I2C address 0x27, 20 columns and 4 rows

// WiFi Setup
#include <WiFi.h>

// NL NTP Server Setup
#define NTP_SERVER     "nl.pool.ntp.org"
#define UTC_OFFSET     0
#define UTC_OFFSET_DST 0

// DHT22
#include "DHT.h"
#define DHTPIN 12
#define DHTTYPE DHT22 // DHT 22
DHT dht(DHTPIN, DHTTYPE);

void spinner() {
  static int8_t counter = 0;
  const char* glyphs = "\xa1\xa5\xdb";
  lcd.setCursor(15, 1);
  lcd.print(glyphs[counter % 3]);
  counter++;
}

void printLocalTime() {
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    lcd.setCursor(0, 1);
    lcd.print("Connection Err");
    return;
  }

  lcd.setCursor(15, 0);
  lcd.print(&timeinfo, "%H:%M");
}

void setup() {
  Serial.begin(115200);
  dht.begin();

  lcd.init(); // initialize the lcd
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Connecting to WiFi");

  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(250);
    spinner();
  }
  Serial.println("\nWiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Updating time...");
  delay(3250);
  lcd.clear();
  lcd.setCursor(14, 3);
  lcd.print("Online");

  configTime(UTC_OFFSET, UTC_OFFSET_DST, NTP_SERVER);
}

void loop() {
  printLocalTime();
  dhtloop();
  delay(250);
}

void dhtloop() {
  delay(2000);

  float h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);

  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  float hif = dht.computeHeatIndex(f, h);
  float hic = dht.computeHeatIndex(t, h, false);

  lcd.setCursor(0, 0);
  lcd.print(F("LVI: "));
  lcd.setCursor(5, 0);
  lcd.print(h);
  lcd.setCursor(0, 1);
  lcd.print(F("TEI: "));
  lcd.setCursor(5, 1);
  lcd.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));
}