#include <WiFi.h>  
#include <PubSubClient.h>
#include <DHTesp.h>
#include <LiquidCrystal_I2C.h> 

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int DHT_PIN = 15;  
DHTesp dht; 
const char* ssid = "Wokwi-GUEST"; // Wifi SSID 
const char* password = "";
const char* mqtt_server = "test.mosquitto.org"; // Mosquitto server URL

WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
int led1 = 2; // Assigning the pins correctly
int led2 = 4; // Example pin

void setup_wifi() { 
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA); 
  WiFi.begin(ssid, password);

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

  randomSeed(micros());

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

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

void reconnect() { 
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected");
      client.publish("/ThinkIOT/Publish", "Welcome");
      client.subscribe("/ThinkIOT/Subscribe"); 
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  pinMode(led1, OUTPUT); // Set pins as outputs    
  pinMode(led2, OUTPUT); // Set pins as outputs

  Serial.begin(115200);
  setup_wifi(); 
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  lcd.init();
  lcd.backlight(); 
  dht.setup(DHT_PIN, DHTesp::DHT22);
}

void loop() {
  if (!client.connected()) {
    reconnect();
    lcd.setCursor(0,0);
  }
  client.loop();
  sendSensor();
}

void sendSensor() {
  TempAndHumidity data = dht.getTempAndHumidity();
  if (isnan(data.humidity) || isnan(data.temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  unsigned long now = millis();
  if (now - lastMsg > 2000) { //perintah publish data
    lastMsg = now;

    String tempStr = String(data.temperature, 2);
    client.publish("/IOT/Poltekkes/temp2", tempStr.c_str()); // publish temp topic /ThinkIOT/temp

    String humStr = String(data.humidity, 1); 
    client.publish("/IOT/Poltekkes/hum2", humStr.c_str());   // publish hum topic /ThinkIOT/hum

    lcd.setCursor(0, 0); // Set posisi kursor LCD baris 1
    lcd.print("Suhu: "); // Tampilkan teks "Suhu: "
    lcd.print(tempStr); // Tampilkan nilai suhu
    lcd.print(" "); // Tampilkan satuan Celsius
    lcd.print((char)223);
    lcd.print("C");
    lcd.setCursor(0, 1); // Set posisi kursor LCD baris 2
    lcd.print("Kelembaban: "); // Tampilkan teks "Kelembaban: "
    lcd.print(humStr); // Tampilkan nilai kelembaban
    lcd.print(" %"); // Tampilkan persen kelembapan
    delay(2000); // Jeda 2 detik
    lcd.clear(); // Bersihkan tampilan LCD

    Serial.print("Temperature: ");
    Serial.println(tempStr);
    Serial.print("Humidity: ");
    Serial.println(humStr);

    if (data.temperature > 35) {
      digitalWrite(led1, HIGH);
    } else {
      digitalWrite(led1, LOW);
    }

    if (data.humidity > 50) {
      digitalWrite(led2, HIGH);
    } else {
      digitalWrite(led2, LOW);
    }
  }
}