#include <WiFi.h>
#include <ESPAsyncWebServer.h>
#include <AsyncTCP.h>

// WiFi-Konfiguration
const char* ssid = "Dein_WLAN_SSID";
const char* password = "Dein_WLAN_Passwort";

// WebSocket-Server
AsyncWebServer server(80);
AsyncWebSocket ws("/ws");

volatile int impulseCount = 0;
volatile unsigned long lastImpulseTime = 0;
volatile unsigned long impulseInterval = 0;

void IRAM_ATTR handleImpulse() {
  unsigned long currentTime = micros();
  impulseInterval = currentTime - lastImpulseTime;
  lastImpulseTime = currentTime;
  impulseCount++;
}

void notifyClients() {
  // Berechnung der Impulsfrequenz
  float frequency = (impulseInterval > 0) ? (1000000.0 / impulseInterval) : 0;
  
  // JSON-Payload erstellen
  String json = "{\"impulseCount\":" + String(impulseCount) + 
                ",\"frequency\":" + String(frequency) + "}";
  ws.textAll(json);
}

void setup() {
  Serial.begin(115200);
  pinMode(4, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(4), handleImpulse, FALLING);

  // WLAN-Verbindung
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Verbinde mit WLAN...");
  }
  Serial.println("Verbunden! IP-Adresse: " + WiFi.localIP().toString());

  // WebSocket einrichten
  ws.onEvent([](AsyncWebSocket * server, AsyncWebSocketClient * client, 
                AwsEventType type, void * arg, uint8_t *data, size_t len) {
    if (type == WS_EVT_CONNECT) {
      Serial.println("WebSocket verbunden");
    }
  });
  server.addHandler(&ws);
  server.begin();
}

void loop() {
  notifyClients();
  delay(1000);  // Update alle 1 Sekunde
}