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

// Replace with your network credentials (STATION)
#define ssid "Wokwi-GUEST"
#define password ""

// MQTT Broker settings
const char* mqtt_server = "192.168.0.11";  // ใช้ MQTT Broker ฟรี
const int mqtt_port = 1883;
const char* mqtt_topic = "/Face/Test";

WiFiClient espClient;
PubSubClient client(espClient);

// LED pin
const int ledPin = 2;

String oldname;

void initWiFi() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi ..");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print('.');
    delay(1000);
  }
  Serial.println();
  Serial.println("Connected to WiFi");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.println(topic);
  
  String receivedMessage;
  for (int i = 0; i < length; i++) {
    receivedMessage += (char)payload[i];  // อ่าน payload เป็น String
  }
  Serial.print("Message: ");
  Serial.println(receivedMessage);

  // ตรวจสอบข้อความว่าไม่ใช่ "Unknown"
  if (receivedMessage != "Unknown") {
    if (receivedMessage != oldname){
      digitalWrite(ledPin, HIGH);  // เปิดไฟ LED
      Serial.println("LED ON: Recognized face");
    }
    
  } else {
    digitalWrite(ledPin, LOW);  // ปิดไฟ LED
    Serial.println("LED OFF: Unknown face");
  }
  delay(3000);
  digitalWrite(ledPin, LOW);
  oldname = receivedMessage;
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // สร้าง clientId ที่ไม่ซ้ำกัน
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    // พยายามเชื่อมต่อ MQTT Broker
    if (client.connect(clientId.c_str())) {
      Serial.println("connected");
      // สมัครสมาชิก topic
      client.subscribe(mqtt_topic);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }

    
  }
}

void setup() {
  Serial.begin(115200);
  
  // ตั้งค่า LED
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);  // เริ่มต้นปิดไฟ LED

  initWiFi();
  
  // ตั้งค่า MQTT
  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
}

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

  // Other code can be added here if needed.
}