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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "broker.emqx.io";
const int port = 1883;
char clientId[50];

WiFiClient espClient;
PubSubClient client(espClient);

// Röle pinleri
const int relayPins[4] = {5, 18, 19, 21};

void setup() {
  Serial.begin(115200);
  delay(10);

  snprintf(clientId, sizeof(clientId), "ESP32-%ld", random(1000000));

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi Connected!");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  client.setServer(mqttServer, port);
  client.setCallback(callback);

  // Röle pinlerini çıkış olarak ayarla
  for (int i = 0; i < 4; i++) {
    pinMode(relayPins[i], OUTPUT);
    digitalWrite(relayPins[i], LOW);
  }

  // Joker karakterle tüm röle konularına abone ol
  client.subscribe("role/led4lu/+");
  Serial.println("Subscribed to role/led4lu/+");
}

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

void mqttReconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection with client ID: ");
    Serial.println(clientId);
    if (client.connect(clientId)) {
      Serial.println("connected");
      client.subscribe("role/led4lu/+");
      Serial.println("Subscribed to role/led4lu/+");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void callback(char* topic, byte* message, unsigned int length) {
  String payload = "";
  for (unsigned int i = 0; i < length; i++) {
    payload += (char)message[i];
  }
  payload.trim();

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

  // Röle numarasını topic'ten ayıkla
  String topicStr = String(topic);
  int lastSlash = topicStr.lastIndexOf('/');
  String relayId = topicStr.substring(lastSlash + 1); // Örn: "R1"

  if (relayId.length() != 2 || relayId.charAt(0) != 'R') {
    Serial.println("Invalid topic format!");
    return;
  }

  int relayNum = relayId.substring(1).toInt();
  if (relayNum < 1 || relayNum > 4) {
    Serial.println("Invalid relay number!");
    return;
  }

  int relayIndex = relayNum - 1;

  if (payload == "1") {
    digitalWrite(relayPins[relayIndex], HIGH);
    Serial.printf("Relay %d ON\n", relayNum);
  } else if (payload == "0") {
    digitalWrite(relayPins[relayIndex], LOW);
    Serial.printf("Relay %d OFF\n", relayNum);
  } else {
    Serial.println("Unknown payload!");
  }
}