#include <Arduino.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <LiquidCrystal_I2C.h>
//#include "DHTesp.h"

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

//define sound speed in cm/uS
#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701

long duration;
float distanceCm;
float distanceInch;

LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 16, 2);

String wifiSSID = "Wokwi-GUEST";
String wifiPassword = "";


String tbHost = "eu.thingsboard.cloud";
String tbToken = "Omid27I8y6VDPEBtcfUD";

//const int DHT_PIN = 15;
//DHTesp dhtSensor;

void connectWifi() {
  WiFi.begin(wifiSSID.c_str(), wifiPassword.c_str());
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }
}

void sendDataToThingsBoard(String distanceCm, String distanceInch) {
  HTTPClient http;
  String url = "http://" + tbHost + "/api/v1/" + tbToken + "/telemetry";
  //String payload = "{\"temperature\":" + temperature + ",\"humidity\":" + humidity + "}";
 String payload = "{\"distanceCm\":" + distanceCm + ",\"distanceInch\":" + distanceInch + "}";

  http.begin(url);
  http.addHeader("Content-Type", "application/json");

  int httpResponseCode = http.POST(payload);

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

  http.end();
}

void setup() {
  Serial.begin(115200);
  connectWifi();
   pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
 // dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  lcd.init();
  lcd.backlight();
}

void loop() {
  //TempAndHumidity  data = dhtSensor.getTempAndHumidity();


// Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  
  // Calculate the distance
  distanceCm = duration * SOUND_SPEED/2;
  
  // Convert to inches
  distanceInch = distanceCm * CM_TO_INCH;
  
  // Prints the distance in the Serial Monitor
  Serial.print("Distance (cm): ");
  Serial.println(distanceCm);
  Serial.print("Distance (inch): ");
  Serial.println(distanceInch);
  
  
  delay(1000);

String distanceCm2=String(distanceCm);
String distanceInch2=String(distanceInch);
 // String temp = String(data.temperature,2);
 // String hum = String(data.humidity,1);

  // Serial.println("Temp: " + String(temp) + "°C");
  // Serial.println("Humidity: " + String(hum) + "%");
  // Serial.println("---");

  lcd.setCursor(0, 0);
  lcd.print("Distance (cm): "); 
  lcd.print("distanceCm" ); 
  lcd.setCursor(0, 1);
  lcd.print("Distance (inch): ");  
lcd.print("distanceInch" );
  sendDataToThingsBoard(distanceCm2 , distanceInch2);
  delay(1000); // Wait for a new reading from the sensor (DHT22 has ~0.5Hz sample rate)
}