//inisialisasi library
#include <WiFi.h>
#include <PubSubClient.h>
#include <DHTesp.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

const int RELAY_PIN = 18;
const int DHT_PIN = 15;
DHTesp dht; 
String state_out;

// Konfigurasi WiFi dan MQTT
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "kmi-iot.id";

WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
float temp = 0;
float hum = 0;

// Fungsi koneksi WIFI
void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Menghubungkan ke jaringan WiFi ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA); // MODE STA
  WiFi.begin(ssid, password); // Memulai koneksi ke WiFi

  while (WiFi.status() != WL_CONNECTED) { // Menunggu koneksi berhasil
    delay(500);
    Serial.print(".");
  }

  randomSeed(micros());
  Serial.println("WiFi berhasil terhubung");
  Serial.println("Alamat IP: ");
  Serial.println(WiFi.localIP());
}

// Fungsi callback
void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Pesan diterima [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();
}

// Fungsi Reconnect MQTT
void reconnect() {
  while (!client.connected()) { 
    Serial.print("Mencoba menghubungkan ke MQTT broker...");
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("HUBUNGKAN MQTT..");
    client.subscribe("TI2A/tubes/kelompok_4"); // Berlangganan topik
    client.publish("TI2A/tubes/kelompok_4/koneksi", "menghubungkan", true);

    if (client.connect(clientId.c_str())) {
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("KONEKSI BERHASIL");
      delay(1000);
      lcd.clear();
      Serial.println("Terhubung ke MQTT broker");
      client.publish("TI2A/tubes/kelompok_4/koneksi", "terhubung", true); // Mengirim pesan awal

    } else {
      Serial.print("Gagal, rc=");
      Serial.print(client.state());
      Serial.println(". Coba lagi dalam 5 detik");
      client.publish("TI2A/tubes/kelompok_4/koneksi", "menghubungkan",true);
      delay(5000);
    }
  }
}


void setup() {
  pinMode(RELAY_PIN, OUTPUT);

  lcd.init();
  lcd.backlight();
  lcd.setCursor(3,0);
  lcd.print("MONITORING");
  lcd.setCursor(6,1);
  lcd.print("SUHU");
  delay(2000);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("HUBUNGKAN MQTT..");
  delay(2000);
  lcd.clear();

  Serial.begin(115200);
  setup_wifi(); 
  client.setServer(mqtt_server, 1885); // broker mqtt
  client.setCallback(callback); 
  dht.setup(DHT_PIN, DHTesp::DHT22); // Inisialisasi  DHT22
  
}

void loop() {
  if (!client.connected()) { // Cek koneksi 
    reconnect(); 
  }
  client.loop();

  unsigned long now = millis();
  if (now - lastMsg > 2000) { 
    lastMsg = now;
    TempAndHumidity data = dht.getTempAndHumidity(); 

    // Mengirim data suhu ke MQTT
    String temp = String(data.temperature, 2);
    client.publish("TI2A/tubes/kelompok_4/temp", temp.c_str(), true);

    // Mengirim data kelembaban ke MQTT
    String hum = String(data.humidity, 1);
    client.publish("TI2A/tubes/kelompok_4/hum", hum.c_str(), true);

    // Menampilkan data di serial monitor
    Serial.print("Temperature: ");
    Serial.println(temp);
    Serial.print("Humidity: ");
    Serial.println(hum);

    // Menampilkan data di layar LCD
    lcd.setCursor(0,0);
    lcd.print("TEMP :");
    lcd.setCursor(7,0);
    lcd.print(temp);
    lcd.setCursor(0,1);
    lcd.print("HUM  :");
    lcd.setCursor(7,1);
    lcd.print(hum);

     state_out = String(digitalRead(RELAY_PIN));
    if(temp >= "25") {
      digitalWrite(RELAY_PIN, HIGH);
 
      client.publish("TI2A/tubes/kelompok_4/output", state_out.c_str(), true);
    }
    else{
      digitalWrite(RELAY_PIN, LOW);
      client.publish("TI2A/tubes/kelompok_4/output", state_out.c_str(), true);
    }
    delay(2000);
    lcd.clear();

  }
}