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

// Ganti dengan kredensial WiFi Anda
const char* ssid = "kutynidx";
const char* password = "kuznetsov";

// Ganti dengan alamat broker MQTT Anda
const char* mqtt_server = "192.168.1.100";  // IP Gateway / Broker lokal
const int mqtt_port = 1883;
const char* mqtt_topic = "node/data";

// Pin Sensor
const int trigPin = 18;
const int echoPin = 5;
const int ldrPin = 12;

// MQTT & WiFi
WiFiClient espClient;
PubSubClient client(espClient);

// Variabel non-blocking
unsigned long lastSendTime = 0;
const unsigned long interval = 1000; // 1 detik

void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Menghubungkan ke ");
  Serial.println(ssid);

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

  Serial.println("");
  Serial.println("WiFi terkoneksi");
  Serial.println(WiFi.localIP());
}

void reconnect() {
  // Loop sampai terkoneksi ke broker
  while (!client.connected()) {
    Serial.print("Menghubungkan ke MQTT...");
    String clientId = "ESP32Node-";
    clientId += String(random(0xffff), HEX);
    
    if (client.connect(clientId.c_str())) {
      Serial.println("terhubung");
    } else {
      Serial.print("gagal, rc=");
      Serial.print(client.state());
      Serial.println(" mencoba lagi dalam 5 detik");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  setup_wifi();
  client.setServer(mqtt_server, mqtt_port);
}

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

  unsigned long currentMillis = millis();
  if (currentMillis - lastSendTime >= interval) {
    lastSendTime = currentMillis;

    // Baca LDR
    int ldrValue = analogRead(ldrPin);

    // Baca Ultrasonik
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2);
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin, LOW);
    float duration_us = pulseIn(echoPin, HIGH, 30000);  // Timeout 30ms
    float distance_cm = duration_us * 0.034 / 2;

    // Buat JSON string
    StaticJsonDocument<128> doc;
    doc["ldr"] = ldrValue;
    doc["distance"] = distance_cm;

    char buffer[128];
    serializeJson(doc, buffer);

    // Kirim ke MQTT
    client.publish(mqtt_topic, buffer);
    Serial.println(buffer);
  }
}


// #include <Wire.h>

// const int trigPin = 18;
// const int echoPin = 5;
// const int ldrPin = 12;
// float adcValue = 0;
// float duration_us, distance_cm;

// void setup() {
//   // put your setup code here, to run once:
//   Serial.begin(9600);
//   pinMode(trigPin, OUTPUT);
//   pinMode(echoPin, INPUT);
// }

// void loop() {

//   adcValue = analogRead(ldrPin);
//   digitalWrite(trigPin, HIGH);
//   delay(10); // this speeds up the simulation
//   digitalWrite(trigPin, LOW);

//   duration_us = pulseIn(echoPin, HIGH);
//   distance_cm = 0.017 * duration_us;

//   Serial.print("Nilai ADC: ");
//   Serial.println(adcValue);

//   Serial.println("Distance: ");
//   Serial.print(distance_cm);
//   Serial.print(" cm");
//   delay(1000);
// }