#define PIN_TRIG 13
#define PIN_ECHO 14
int jarak, tinggi;
int tinggiMaksimal = 450;

#include <WiFi.h>
#include <HTTPClient.h>
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* botToken = "";
const char* chatID = "";

boolean flag = false;

void setup() {
  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
}

void loop() {

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

  int duration = pulseIn(PIN_ECHO, HIGH);
  jarak = (duration / 2) / 29.1;
  tinggi = tinggiMaksimal - jarak;
  Serial.print("Jarak CM: ");
  Serial.println(jarak);
  Serial.print("Tinggi CM: ");
  Serial.println(tinggi);

  if( (tinggi > 400) && (flag == false) ){
    sendTelegramMessage("WARNING!!! SUNGAI SUDAH PENUH...");
    flag = true;
  }

  if(tinggi <= 400){
    flag = false;
  }

  delay(1000);
}

void sendTelegramMessage(String message) {
  HTTPClient http;
  String url = "https://api.telegram.org/bot" 
  + String(botToken) + "/sendMessage?chat_id=" 
  + String(chatID) + "&text=" + message;
  http.begin(url);
  int httpResponseCode = http.GET();
  if (httpResponseCode > 0) {
    Serial.print("HTTP Response code: ");
    Serial.println(httpResponseCode);
  } else {
    Serial.println("Error in sending message");
  }
  http.end();
}