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

#define Trig 25
#define Echo 26
const int DHT_PIN = 15;  
const int LED_PIN = 13;
const int LED_PIN1 = 21;
const int Buzzer = 18;

DHTesp dht; 
const char* ssid ="Wokwi-GUEST";
const char* password = "";

const char* mqtt_server = "test.mosquitto.org";
const char* SUBTOPIC_LED = "/room/led";
const char* SUBTOPIC_TEMP = "/room/temp";
const char* SUBTOPIC_HUMIDITY = "/room/hum";
const char* SUBTOPIC_DISTANCE = "/room/SEC/";
const char* SUBTOPIC_LEDBUZ="/contro/led/buzzer";

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

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 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.subscribe(SUBTOPIC_LED);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }}
}

void callback(char *topic, byte *payload, unsigned int length) {
  Serial.print("Receive Topic: ");
  Serial.println(topic);
  Serial.print("Payload: ");
  Serial.println((char *)payload);
  if (!strcmp(topic, SUBTOPIC_LED)) {
    if (!strncmp((char *)payload, "on", length)) {
      Serial.println("LED ON");
      digitalWrite(LED_PIN, HIGH);
    } else if (!strncmp((char *)payload, "of", length)) {
      Serial.println("LED OF");
      digitalWrite(LED_PIN, LOW);
    }
  }
}
void setup() {
  pinMode(LED_PIN, OUTPUT);     
  pinMode(LED_PIN1, OUTPUT);
  pinMode(Buzzer , OUTPUT);
  pinMode(Trig, OUTPUT);
  pinMode(Echo, INPUT);
  Serial.begin(115200);
  setup_wifi(); 
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback); 
  dht.setup(DHT_PIN, DHTesp::DHT22);
}
void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  
  unsigned long now = millis();
  if (now - lastMsg > 1000) { //perintah publish data
    lastMsg = now;

    digitalWrite(Trig, HIGH);
    delay(100);
    digitalWrite(Trig, LOW);

    duration = pulseIn(Echo, HIGH);
    distance = (duration/2)/29.1;
    client.publish(SUBTOPIC_DISTANCE, String(distance).c_str());
    Serial.print("Distence:");
    Serial.println(distance);

    if(distance <= 20){
      digitalWrite(LED_PIN1, HIGH);
      digitalWrite(Buzzer, HIGH);
      tone(Buzzer, 100);
      delay(5000);
      Serial.println("LED ON");
    }else if( distance > 20 ){
      digitalWrite(LED_PIN1, LOW);
      digitalWrite(Buzzer , LOW);
      noTone(Buzzer);
      Serial.println("LED OF");
      Serial.println("Buzzer OF");
    }


    TempAndHumidity  data = dht.getTempAndHumidity();
    String temp = String(data.temperature, 2);
    client.publish(SUBTOPIC_TEMP, temp.c_str()); 
    String hum = String(data.humidity, 1); 
    client.publish(SUBTOPIC_HUMIDITY, hum.c_str()); 
    Serial.print("Temperature: ");
    Serial.println(temp);
    Serial.print("Humidity: ");
    Serial.println(hum);
  }
}