#include <WiFi.h>
#include <HTTPClient.h>
#include "DHT.h"

#define DHTPIN 4
#define DHTTYPE DHT22

#define TRIG_PIN 5
#define ECHO_PIN 18

const char* ssid = "Wokwi-GUEST";
const char* password = "";

String apiKey = "HFOUXVQW6OI1CE9R";

DHT dht(DHTPIN, DHTTYPE);

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

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  dht.begin();

  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");

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

  Serial.println("Connected!");
}

float getDistance() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);

  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  long duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;

  return distance;
}

void loop() {
  if (WiFi.status() == WL_CONNECTED) {
    float temp = dht.readTemperature();
    float hum = dht.readHumidity();
    float dist = getDistance();

    if (isnan(temp) || isnan(hum)) {
      Serial.println("Failed to read from DHT!");
      return;
    }

    Serial.println("Temp: " + String(temp));
    Serial.println("Humidity: " + String(hum));
    Serial.println("Distance: " + String(dist));

    HTTPClient http;

    String url = "http://api.thingspeak.com/update?api_key=" + apiKey +
                 "&field1=" + String(temp) +
                 "&field2=" + String(hum) +
                 "&field3=" + String(dist);

    http.begin(url);
    int httpResponseCode = http.GET();

    if (httpResponseCode > 0) {
      Serial.println("Data sent to ThingSpeak");
    } else {
      Serial.println("Error sending data");
    }

    http.end();
  }

  delay(1500); // ThingSpeak limit (15 sec)
}