#include <WiFi.h>
#include <HTTPClient.h>
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* token = "2BVONtoXmBh5nogutyDXZMqAktDk1cG7KitA4a9oBul"; //Line token form https://notify-bot.line.me/th/
#define ECHO_PIN 27
#define TRIG_PIN 14
#define RED_LED 12
#define GREEN_LED 13
bool passing = false;
int counter = 1;
int distance = 100;
String text;
void setup() {
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(RED_LED,OUTPUT);
  pinMode(GREEN_LED,OUTPUT);
  Serial.begin(115200);
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
  Serial.println(" READY ");
}
float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}

void loop(){
    if (WiFi.status() == WL_CONNECTED) {
        HTTPClient http;
        http.begin("https://notify-api.line.me/api/notify");
        http.addHeader("Authorization", "Bearer " + String(token));
        http.addHeader("Content-Type", "application/x-www-form-urlencoded");
      float cm = readDistanceCM();
      digitalWrite(GREEN_LED,HIGH);
      if(cm < distance && !passing && cm!=0){
        http.POST("message=Ehe Tutor Bot");
        http.POST("message=มีนักเรียนเข้าห้องเรียน");
        http.POST("message=ขณะนี้มีนักเรียนในห้องเรียน "+String(counter)+" คน");
        digitalWrite(RED_LED,HIGH);
	      passing = true;
        counter++; 
      }
      if(cm > distance) passing = false;
      int httpCode = http.POST("READY");
      if (httpCode > 0) String response = http.getString();
      else Serial.println(".....");
      http.end();
      delay(250);
  }
}