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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "demo.thingsboard.io";
const char* token = "";

WiFiClient espClient;
PubSubClient client(espClient);

const int relayPin = 23;
const int ledPin1 = 21;
const int ledPin2 = 19;
const int ledPin3 = 18;
const int ldrPin = 34;

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);

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

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

  pinMode(relayPin, OUTPUT);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
}

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

  int ldrValue = analogRead(ldrPin);

  // If it's dark, turn on lights
  if (ldrValue < 500) {
    digitalWrite(relayPin, HIGH);
    digitalWrite(ledPin1, HIGH);
    digitalWrite(ledPin2, HIGH);
    
  } else {
    digitalWrite(relayPin, LOW);
    digitalWrite(ledPin1, LOW);
    digitalWrite(ledPin2, LOW);
    
  }

  // Send LDR data to ThingBoard
  String payload = "{\"ldrValue\": " + String(ldrValue) + "}";
  client.publish("v1/devices/me/telemetry", payload.c_str());

  delay(2000);
}

void reconnect() {
  while (!client.connected()) {
    if (client.connect("ESP32Client", token, NULL)) {
      client.subscribe("v1/devices/me/rpc/request/+");
    } else {
      delay(5000);
    }
  }
}

void callback(char* topic, byte* payload, unsigned int length) {
  String message;
  for (int i = 0; i < length; i++) {
    message += (char)payload[i];
  }
  Serial.println(message[31]);
  message = String(message);
  if (message[31] == 't') {
    
    digitalWrite(ledPin3, HIGH);
  } else if (message[31] == 'f') {
   
    digitalWrite(ledPin3, LOW);
  }
}