#include <WiFi.h>
#include "PubSubClient.h"
#include <ArduinoJson.h> 
// WiFi
char ssid[]="Asmaa's iPhone";
char pass[]="asmaa1234567";
int status = WL_IDLE_STATUS; 
// MQTT Broker
const char *mqtt_broker = "broker.emqx.io";//Public Broker
const char *mqtt_username ="Wokwi-GUEST";
const char *mqtt_password="";
const int mqtt_port = 8883;
// App Protcol ---> Port 
const char *topic_publish = "Led";//Topic ESP32 Pusblish
const char *topic_subsrcibe = "Led";//Topic ESp32 Subs
//const char *topic_subsrcibe2 = "emqx/esp32/s2";//Topic ESp32 Subs "Not Usable"

WiFiClient hamada;//WIFI Opject
PubSubClient client(hamada);//OOP

void callback(char *topic, byte *payload, unsigned int length);
#define sensor 32

void setup(){
   // Setting LED pin as output
pinMode(OUTPUT,sensor);
    Serial.begin(115200);
    // Connecting to a Wi-Fi network
    WiFi.begin("Wokwi-GUEST", "");
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.println("Connecting to WiFi..");
    }
        Serial.println("Connected to the Wi-Fi network");
      
    //connecting to a mqtt broker
    Serial.println("Before Connect MQTT");
    //Broker Configuration 
    client.setServer(mqtt_broker, mqtt_port);

    while (!client.connected()) {
        String client_id = "esp32-client-";
        client_id =client_id+ String(WiFi.macAddress());

        //ESP32-ID -----> esp32-client-macaddress
        //variable.c_str()--->char [] , String
        Serial.printf("The client %s connects to the public MQTT broker\n", client_id.c_str());
        if (client.connect(client_id.c_str(), mqtt_username, mqtt_password)) {
            Serial.println("Public MQTT broker connected");
        } else {
            Serial.print("failed with state ");
            Serial.print(client.state());//1 , 2 , 5
            delay(2000);
        }
    }
    Serial.println("After Connect MQTT");
    client.publish(topic_publish, "Hi, I'm ESP32 ^^");
}

int irread = 0;
long distance = 0;
char DISCOVERY_STRING_01[1000];
void loop() {
    irread = analogRead(sensor);
distance = map(irread, 0, 4095, 0, 11);
  StaticJsonDocument<1000> doc;
  doc["distance"] = distance;


  serializeJson(doc, DISCOVERY_STRING_01);
  client.publish(topic_publish, DISCOVERY_STRING_01);
    client.subscribe(topic_subsrcibe);
    client.setCallback(callback);

  client.loop();

}



void callback(char* topic, byte* message, unsigned int length) {
  printPayload(topic, message, length);  
}

void printPayload(char* topic, byte* message, unsigned int length) {
  // Printing Received Message
  Serial.print("Message received on topic: ");
  Serial.println(topic);

  String messageTemp;
  for(int i=0; i<length; i+=1) {
    messageTemp += (char)message[i];
  }
  if(String(topic) == "Led"){
    StaticJsonDocument<1024> doc;
  auto error = deserializeJson(doc, DISCOVERY_STRING_01);// string to object
  if ( error ) { 
    Serial.println("Error interpreting config file");
  
  }

  const long _distance = doc["distance"];
  

  distance = _distance;

      Serial.println("OK sensor reading: ");
   Serial.println(messageTemp);
  }

  else{
    Serial.print("Any Thing");  
  }
  
}