#include <WiFi.h>
#include <ThingSpeak.h>

WiFiClient client;

unsigned long myChannelNumber = 3290294;
const char * myWriteAPIKey = "M45EL8OAVWZDR6AF";

void setup() {

  Serial.begin(9600);
  Serial.println("ESP32 STARTED");

  WiFi.begin("Wokwi-GUEST", "", 6);

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

  Serial.println("\nWiFi Connected");

  ThingSpeak.begin(client);
}

void loop() {

  if (Serial.available()) {

    String data = Serial.readStringUntil('\n');

    Serial.println(data);   // 👈 ADD THIS LINE (debug)

    int firstComma = data.indexOf(',');
    int secondComma = data.indexOf(',', firstComma + 1);

    if (firstComma != -1 && secondComma != -1) {

      float temp = data.substring(0, firstComma).toFloat();
      float hum  = data.substring(firstComma + 1, secondComma).toFloat();
      float pres = data.substring(secondComma + 1).toFloat();

      ThingSpeak.setField(1, temp);
      ThingSpeak.setField(2, hum);
      ThingSpeak.setField(3, pres);

      int status = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

      if (status == 200)
        Serial.println("Upload successful");
      else
        Serial.println("Upload failed");
    }
  }
}