#include <WiFi.h>
#include <ThingsBoard.h>
#include <Arduino_MQTT_Client.h>
#include <ArduinoHttpClient.h>
#include <PubSubClient.h>
#include <OneWire.h>
#include <DallasTemperature.h>

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

// ThingsBoard server and token
#define TB_SERVER "thingsboard.cloud"
#define TB_TOKEN "neqb3nKSmD1h9YYwOgg4"

// Ultrasonic sensor pins
const int trigPin = 16;
const int echoPin = 17;

// DS18B20 temperature sensor pin
const int ONE_WIRE_BUS = 4; // GPIO pin connected to the DS18B20 data pin

// WiFi credentials
#define WIFI_AP "Wokwi-GUEST"
#define WIFI_PASS ""

// Maximum message size for ThingsBoard
constexpr uint16_t MAX_MESSAGE_SIZE = 128U;

// Create WiFi and MQTT clients
WiFiClient espClient;
Arduino_MQTT_Client mqttClient(espClient);
ThingsBoard tb(mqttClient, MAX_MESSAGE_SIZE);

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

long duration;
float distanceCm;
float distanceInch;

void setup() {
  // Initialize serial communication
  Serial.begin(115200);

  // Initialize ultrasonic sensor pins
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Start up the DS18B20 temperature sensor
  sensors.begin();

  // Connect to WiFi
  WiFi.begin(WIFI_AP, WIFI_PASS);
  Serial.println("Connecting to WiFi...");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());

  // Connect to ThingsBoard
  Serial.println("Connecting to ThingsBoard Server....");
  while(!tb.connect(TB_SERVER, TB_TOKEN)) {
    Serial.println("Failed to connect to ThingsBoard...");
    delay(500);
  }
  Serial.println("Connected to ThingsBoard...");
}

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

  // Set the trigPin on HIGH state for 10 microseconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance in centimeters
  distanceCm = duration * SOUND_SPEED / 2;

  // Convert the distance to inches
  distanceInch = distanceCm * CM_TO_INCH;

  // Print the distance in the Serial Monitor
  Serial.print("Distance (cm): ");
  Serial.println(distanceCm);
  Serial.print("Distance (inch): ");
  Serial.println(distanceInch);
  delay(500);

  // Send distance data to ThingsBoard
  String distanceCmJson = "{\"Distance_Cm\":" + String(distanceCm) + "}";
  tb.sendTelemetryJson(distanceCmJson.c_str());
  Serial.println("Distance data sent to ThingsBoard (cm)");

  String distanceInchJson = "{\"Distance_Inch\":" + String(distanceInch) + "}";
  tb.sendTelemetryJson(distanceInchJson.c_str());
  Serial.println("Distance data sent to ThingsBoard (inch)");

  // Read temperature from the DS18B20 sensor
  sensors.requestTemperatures();
  float temperatureC = sensors.getTempCByIndex(0);
  float temperatureF = sensors.toFahrenheit(temperatureC);

  // Print the temperature in the Serial Monitor
  Serial.print("Temperature (C): ");
  Serial.println(temperatureC);
  Serial.print("Temperature (F): ");
  Serial.println(temperatureF);

  // Send temperature data to ThingsBoard
  String temperatureCJson = "{\"Temperature_C\":" + String(temperatureC) + "}";
  tb.sendTelemetryJson(temperatureCJson.c_str());
  Serial.println("Temperature data sent to ThingsBoard (C)");

  String temperatureFJson = "{\"Temperature_F\":" + String(temperatureF) + "}";
  tb.sendTelemetryJson(temperatureFJson.c_str());
  Serial.println("Temperature data sent to ThingsBoard (F)");

  delay(1000);
}