#include "WiFi.h"
#include <PubSubClient.h>
#include "DHT.h"
#include <ArduinoJson.h>
DynamicJsonDocument doc(1024);
#define DHTPIN 14
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "broker.hivemq.com";
int port = 1883;
char clientId[50];
WiFiClient espClient;
PubSubClient client(espClient);
byte analog_pin = 12;
const int triggerPin = 4;
const int echoPin = 25;
String sensorData;
byte led_pin=19;
byte buzzer_pin=27;
String ledValue;
String buzzerValue;

void setup()
{
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(triggerPin, OUTPUT);
  pinMode(echoPin, INPUT_PULLUP);
  pinMode(led_pin, OUTPUT);
  pinMode(buzzer_pin, OUTPUT);
  Serial.print("Connecting to ");
  Serial.println(ssid);
  wifiConnect();
  client.setServer(mqttServer, port);
  client.setCallback(callback);

  dht.begin();
}
void loop()
{
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  float duration = pulseIn(echoPin, HIGH);
  float distance = duration * 0.034 / 2;
  Serial.println("Distance: " + String(distance, 0) + " cm");
  Serial.println("Distance: " + String(distance / 30.48) + " feet");
  // float distance_in_cm =float(distance,0);
  float distance_in_feet = float(distance / 30.48);
  // doc["temperature"]=temperature;



  Serial.println(distance);
  int analogstatus = analogRead(analog_pin);
  Serial.println(analogstatus);
  float humidity = dht.readHumidity();
  Serial.println(humidity);
  float temperature = dht.readTemperature();
  Serial.println(temperature);


  doc["Temperature"] = temperature;
  doc["humidity"] = humidity;
  doc["analogstatus"] = analogstatus;
  doc["distance_in_cm"] = String(distance, 0);
  doc["distance_in_feet"] = distance_in_feet;
  doc.remove("led_value");
  doc.remove("buzzer_value");
  serializeJson(doc, sensorData);
  Serial.println(sensorData);

  if (!client.connected())
  {
    mqttReconnect();
  }
  else
  {
    client.publish("esp32-pub2", sensorData.c_str());
  }
  client.loop();
 // put delay(1000); // this speeds up the simulation
 delay(1000);
}

void mqttReconnect()
{
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    long r = random(1000);
    sprintf(clientId, "fcs-clientId-%ld", r);
    if (client.connect(clientId)) {
      Serial.print(clientId);
      Serial.println(" connected");
      client.subscribe("ESP32-data2");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void callback(char* topic, byte* message, unsigned int length){
  Serial.print("Message arrived on topic: ");
  Serial.print(topic);
  Serial.print(". Message: ");
  String stMessage;
  for (int i = 0; i < length; i++) {
    // Serial.print((char)message[i]);
    stMessage += (char)message[i];
  }
  Serial.println(stMessage);
  DeserializationError error = deserializeJson(doc,stMessage);
  if (error)
  {
  Serial.print("Parsing failed: ");
  Serial.println(error.c_str());
  return;
  }
  else{
    Serial.println("no error...");
  }
ledValue=doc["led_value"].as<String>();
buzzerValue=doc["buzzer_value"].as<String>();
Serial.println(ledValue);
Serial.println(buzzerValue);
if(ledValue=="led_on")
{
  digitalWrite(led_pin, HIGH);
}
if(buzzerValue=="buzzer_on")
{
    digitalWrite(buzzer_pin, HIGH);

}
else if(ledValue="led_off")
{
    digitalWrite(led_pin, LOW);

}
else if(buzzerValue="buzzer_off")
{
    digitalWrite(buzzer_pin, LOW);

}

}


void wifiConnect()
{
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
}