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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "test.mosquitto.org";
const int mqttPort = 1883;
const char* mqttTopic = "fingerprint_detected";

WiFiClient espClient;
PubSubClient client(espClient);

const int buttonPin = 2;

void setup() {
  Serial.begin(115200);
  pinMode(buttonPin, INPUT);

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

  client.setServer(mqttServer, mqttPort);
  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");
    if (client.connect("ESP32FingerprintClient")) {
      Serial.println("Connected to MQTT");
      client.subscribe("fingerprint_detected");
    } else {
      Serial.print("Failed. State: ");
      Serial.println(client.state());
      delay(2000);

  Serial.println("ESP32 Connected to MQTT!");
}
  }
}

void loop() {
  client.loop();

  if (digitalRead(buttonPin) == HIGH ) {
    delay(300);  // debounce

    int userID = random(1, 4);  // Simulate fingerprint match (1–3)

    String payload = "{\"id\":" + String(userID) + "}";
    client.publish("fingerprint_detected", payload.c_str());

    Serial.println("Published: " + payload);
    delay(2000);  // prevent spamming
  }
}