#include <DHT.h> // Library DHT
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <PubSubClient.h> // Untuk MQTT
#include <ArduinoJson.h>  // Untuk memudahkan pembuatan JSON

#define WIFI_AP "Wokwi-GUEST"
#define WIFI_PASSWORD ""

#define TOKEN "monitoringkipasangin"
char thingsboardServer[] = "thingsboard.cloud";

int status = WL_IDLE_STATUS;
unsigned long lastSend;

WiFiClient wifiClient;
PubSubClient mqttClient(wifiClient); // Menggunakan PubSubClient sebagai MQTT client

LiquidCrystal_I2C lcd(0x27, 16, 2);
DHT dht(5, DHT22); // Pin, Jenis DHT
#define fan 2
#define relay 4

void setup() {
  Serial.begin(9600);
  pinMode(fan, OUTPUT);
  digitalWrite(fan, 1);
  lcd.begin(16, 2);
  dht.begin();
  InitWiFi();
  mqttClient.setServer(thingsboardServer, 1883); // Port default untuk MQTT non-SSL
  lastSend = 0;
  lcd.init();
  lcd.backlight();
}

void loop() {
  if (!mqttClient.connected()) {
    reconnect();
  }

  if (millis() - lastSend > 1000) { // Update dan kirim tiap 1 detik
    kirimDataKeThingsboard();
    lastSend = millis();
  }

  mqttClient.loop();
}

void kirimDataKeThingsboard() {
  Serial.println("Mengambil data sensor");

  byte humidity = dht.readHumidity();
  byte temperature = dht.readTemperature();

  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Gagal membaca sensor DHT!");
    return;
  }

  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C ");


  if (temperature >= 30) {
    digitalWrite(fan, 1);
    digitalWrite(4, HIGH);
    ngeprint("Suhu panas", "Kipas angin on");
  } else {
    digitalWrite(fan, 0);
    digitalWrite(4, LOW);
    ngeprint("Suhu normal", "Kipas angin off");
  }

  // Membuat JSON Object
  StaticJsonDocument<200> jsonBuffer;
  jsonBuffer["temperature"] = temperature;
  jsonBuffer["humidity"] = humidity;
  char JSONmessageBuffer[100];
  serializeJson(jsonBuffer, JSONmessageBuffer);
  
  mqttClient.publish("v1/devices/me/telemetry", JSONmessageBuffer);
}

void InitWiFi() {
  Serial.println("Menghubungkan ...");
  WiFi.begin(WIFI_AP, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Berhasil terhubung!");
}

void reconnect() {
  while (!mqttClient.connected()) {
    Serial.print("Menghubungkan ke ThingsBoard server...");
    // Menggunakan token sebagai ID klien MQTT
    if (mqttClient.connect("DHTClientID", TOKEN, NULL)) {
      Serial.println("[BERHASIL]");
    } else {
      Serial.print("[GAGAL] [ rc = ");
      Serial.print(mqttClient.state());
      Serial.println(" ] [Coba lagi dalam 5 detik]");
      // Tunggu 5 detik sebelum mencoba lagi
      delay(5000);
    }
  }
}

void ngeprint(const char* line1, const char* line2) {
  lcd.setCursor(0, 0);
  lcd.print(line1);
  lcd.setCursor(0, 1);
  lcd.print(line2);
}