#include <DHT.h>
#include <WiFi.h>
#include <PubSubClient.h> 
#include <ArduinoJson.h> 
#include <LiquidCrystal_I2C.h>

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

#define DHT_PIN 15
#define RELAY_PIN 17
#define DHTTYPE DHT22

char thingsboardServer[] = "thingsboard.cloud";

WiFiClient wifiClient;
PubSubClient mqttClient(wifiClient);

DHT dht(DHT_PIN, DHTTYPE);

LiquidCrystal_I2C lcd(0x27, 16, 2);

int status = WL_IDLE_STATUS;
unsigned long lastSend;

void setup() {
  Serial.begin(115200);
  dht.begin();
  delay(10);
  InitWiFi();
  mqttClient.setServer(thingsboardServer, 1883); 
  lastSend = 0;
  pinMode(RELAY_PIN, OUTPUT);

  // Initialize LCD
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temperature:");
}

/////
void loop() {

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

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

  mqttClient.loop();

  delay(2000);

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

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" C, Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  lcd.setCursor(12, 0);
  lcd.print(temperature);

  if (temperature <= 37.0) {
    Serial.println("Dingin, lampu nyala...");
    digitalWrite(RELAY_PIN, HIGH);
    lcd.setCursor(0, 3);
    lcd.print("Light: ON   ");
  }

  else if (temperature >= 39.0) {
    Serial.println("Panas, Lampu Mati...");
    digitalWrite(RELAY_PIN, LOW);
    lcd.setCursor(0, 3);
    lcd.print("Light: OFF  ");
  }
}

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

  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  int relayStatus = digitalRead(RELAY_PIN); // Membaca status lampu

  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.print(" °C\t");
  Serial.print("Light Status: ");
  Serial.println(relayStatus);

  String relayStatusString; // Variabel untuk menyimpan status lampu sebagai string

  // Konversi nilai relayStatus ke string "nyala" atau "mati"
  if (relayStatus == 1) {
    relayStatusString = "ON";
  } else if (relayStatus == 0) {
    relayStatusString = "OFF";
  } else {
    relayStatusString = "tidak valid"; // Jika nilai relayStatus tidak valid
  }

  // Membuat JSON Object
  StaticJsonDocument<200> jsonBuffer;
  jsonBuffer["temperature"] = temperature;
  jsonBuffer["humidity"] = humidity;
  jsonBuffer["light_status"] = relayStatusString; // Menambahkan status lampu sebagai string
  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);
    }
  }
}