#define BLYNK_TEMPLATE_ID "TMPL6SRR_yVVw"
#define BLYNK_TEMPLATE_NAME "TesIoT"
#define BLYNK_AUTH_TOKEN "YGI279aCaxOs81gRL909Lkm5xwrCYTDU"

#include <WiFi.h>
#include <PubSubClient.h>
#include <DHTesp.h>
#include <ESP32Servo.h>

const int DHT_PIN = 15;  
const int LED_PIN = 2; 
const int SERVO_PIN = 4; 

DHTesp dht; 
Servo myServo;


const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "broker.emqx.io";

WiFiClient espClient;
PubSubClient client(espClient);

unsigned long lastMsg = 0;

// ===== WiFi Setup =====
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(".");
  }

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

void callback(char* topic, byte* payload, unsigned int length) { 
  payload[length] = '\0'; 
  String message = String((char*)payload);

  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  Serial.println(message);

  // Kontrol servo
  if (String(topic) == "/ThinkIOT/control/servo") {
    int angle = message.toInt();
    if (angle >= 0 && angle <= 180) {
      myServo.write(angle);
      Serial.print("Servo bergerak ke: ");
      Serial.println(angle);
    } else {
      Serial.println("⚠️ Nilai servo harus 0–180");
    }
  }

  // Kontrol LED manual via MQTT
  if (String(topic) == "/ThinkIOT/control/led") {
    if (message == "ON") {
      digitalWrite(LED_PIN, HIGH);
      Serial.println("LED ON (manual)");
    } else if (message == "OFF") {
      digitalWrite(LED_PIN, LOW);
      Serial.println("LED OFF (manual)");
    }
  }
}

// ===== Reconnect MQTT =====
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", "ESP32 Connected");

      // Subscribe ke topik kontrol
      client.subscribe("/ThinkIOT/control/servo"); 
      client.subscribe("/ThinkIOT/control/led"); 
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

// ===== Setup =====
void setup() {
  pinMode(LED_PIN, OUTPUT);     
  Serial.begin(115200);

  setup_wifi(); 
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback); 

  dht.setup(DHT_PIN, DHTesp::DHT22);
  myServo.attach(SERVO_PIN);
  myServo.write(90); // posisi awal servo
}

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

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

    String temp = String(data.temperature, 2);
    String hum = String(data.humidity, 1);

    client.publish("/Test-Zan/temp", temp.c_str()); 
    client.publish("/Test-Zan/hum", hum.c_str()); 

    Serial.print("Temperature: ");
    Serial.println(temp);
    Serial.print("Humidity: ");
    Serial.println(hum);

    // LED otomatis (bisa override manual via MQTT)
    if (data.temperature >= 30 || data.humidity >= 60) {
      digitalWrite(LED_PIN, HIGH);
      client.publish("/Test-Zan/ledStatus", "ON");
    } else {
      digitalWrite(LED_PIN, LOW);
      client.publish("/Test-Zan/ledStatus", "OFF");
    }
  }
}