#include <WiFi.h>
#include <HTTPClient.h>
#define LED 2

//diganti sesuai ssid sama pass wifi yg ada
const char* ssid = "Wokwi-GUEST";
const char* password = "";

//diganti sesuai akunmu
const char* twilioAccountSID = "AC910e7e7f8bb6c5bab30f3e36fc7ef996";
const char* twilioAuthToken = "d49f00b9475ac534f354bd1c1898947d";
const char* twilioPhoneNumber = "+12542805995";
const char* recipientPhoneNumber = "+6285768591873";

const int trigPin = 18;
const int echoPin = 5;
int buzzer = 13;

long duration;
int jarakCm;

void setup() {
  pinMode(LED, OUTPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

  Serial.println("Connected to WiFi");

}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  jarakCm = duration*0.034/2;

  if (jarakCm >= 300 && jarakCm <= 500){
    tone(buzzer, 900);
    digitalWrite(LED, HIGH);
    delay(400);
    digitalWrite(LED, LOW);
    sendTwilioMessage("Hello from ESP32!");
  }else{
    digitalWrite(LED, LOW);
    noTone(8);
    delay(100);
  }
}

void sendTwilioMessage(const char* message) {
  String url = "https://api.twilio.com/2010-04-01/Accounts/";
  url += twilioAccountSID;
  url += "/Messages.json";

  HTTPClient http;
  http.begin(url);
  http.setAuthorization(twilioAccountSID, twilioAuthToken);

  String postData = "To=";
  postData += recipientPhoneNumber;
  postData += "&From=";
  postData += twilioPhoneNumber;
  postData += "&Body=";
  postData += message;

  http.addHeader("Content-Type", "application/x-www-form-urlencoded");

  int httpResponseCode = http.POST(postData);

  if (httpResponseCode > 0) {
    String response = http.getString();
    Serial.println(httpResponseCode);
    Serial.println(response);
  } else {
    Serial.print("Error sending message. HTTP Response code: ");
    Serial.println(httpResponseCode);
  }

  http.end();
}