#include <WiFi.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <PubSubClient.h>
// Inisialisasi LCD I2C dengan alamat 0x27 dan ukuran 16x2
int suhu;
int kelembapan;

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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "mqtt-dashboard.com";

WiFiClient espClient;
PubSubClient client(espClient);

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

  // Inisialisasi LCD
  LCD.init();
  LCD.backlight();

  // Menampilkan pesan "Selamat pagi..."
  LCD.setCursor(0, 0);
  LCD.print("Selamat pagi");
  LCD.setCursor(0, 1);
  LCD.print("Semoga hari mu");

  delay(3000); // Tampilkan pesan selama 3 detik

  // Koneksi ke WiFi
  LCD.clear();
  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);
    Serial.print(".");
  }

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

  client.setServer(mqtt_server, 1883); //perintah connecting / koneksi awal ke broker
  client.setCallback(callback); //perintah menghubungkan ke mqtt broker untuk subscribe data

}

void reconnect() { //perintah koneksi esp32 ke mqtt broker baik itu sebagai publusher atau subscriber
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // perintah membuat client id agar mqtt broker mengenali board yang kita gunakan
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected");
      // Once connected, publish an announcement...
      client.publish("/indobot/p/mqtt", "Indobot"); //perintah publish data ke alamat topik yang di setting
      // ... and resubscribe
      client.subscribe("/polinema/3B/suhu"); //perintah subscribe data ke mqtt broker
      client.subscribe("/polinema/3B/kelembapan");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void callback(char* topic, byte* payload, unsigned int length) { //perintah untuk menampilkan data ketika esp32 di setting sebagai subscriber
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) { //mengecek jumlah data yang ada di topik mqtt
    Serial.print((char)payload[i]);
  }
  Serial.println();
  char buff[30];
  memcpy(buff, (char*) payload, 30);

  if ( strcmp("/polinema/3B/suhu",topic) == 0 ) // strings are equal
    {
      //Serial.print("Topik Suhu");
      if (sscanf(buff,"suhu=%d", &suhu)==1)
      {
        Serial.printf("Suhu yang masuk=%d", suhu);
      }
    }

  if( strcmp("/polinema/3B/kelembapan",topic) == 0 ) // strings are equal
    {
      //Serial.print("Topik kelembapan");
      if (sscanf(buff,"kelembapan=%d", &kelembapan)==1)
      {
        Serial.printf("Kelembapannya=%d", kelembapan);
      }
    }
  // Switch on the LED if an 1 was received as first character
  if ((char)payload[0] == '1') {
    digitalWrite(2, LOW);   // Turn the LED on (Note that LOW is the voltage level
    // but actually the LED is on; this is because
    // it is active low on the ESP-01)
  } else {
    digitalWrite(2, HIGH);  // Turn the LED off by making the voltage HIGH
  }
}

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


  // Menampilkan waktu dan tanggal pada LCD
  LCD.clear();  // Bersihkan layar setiap kali waktu di-update
  LCD.setCursor(0, 0);
  LCD.print("Suhu : ");
  LCD.print(suhu);


  delay(1000); // Update waktu setiap detik
}