#include <DHT.h>
#include <ArduinoJson.h>
#include <PubSubClient.h>
#include "WiFi.h"

byte motion = 12;
byte light = 14;
byte relay_buzzer = 19;
byte relay_led = 16;
byte temperature = 27;

const char* mqttServer = "broker.hivemq.com";
int port = 1883;
char clientId[50];
const char* ssid = "Wokwi-GUEST";
int channel = 6;
const char* password = "";
WiFiClient espClient;
PubSubClient client(espClient);
DynamicJsonDocument doc(1024);


DHT dht(temperature, DHT22);
DynamicJsonDocument doc1(1024);

String msg_recieved = "";
float temp;
String brightness;
String movement;
String jsonOutput;
String JsonData;


void setup()
{
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  dht.begin();
  pinMode(motion, INPUT);
  pinMode(light, INPUT);
  pinMode(relay_buzzer, OUTPUT);
  pinMode(relay_led, OUTPUT);
  Serial.print("Connecting to ");
  Serial.println(ssid);
  wifiConnect();
  client.setServer(mqttServer, port);
  client.setCallback(callback);
  delay(1000);
}

void loop()
{
  delay(10);
  if (digitalRead(light) == LOW && digitalRead(motion) == 1)
  {
    brightness = "LOW";
    movement = "YES";
  }
  else if (digitalRead(light) == HIGH && digitalRead(motion) == 0)
  {
    movement = "NO";
    brightness = "HIGH";
  }

  temp = dht.readTemperature();

  doc["Motion"] = movement;
  doc["Brightness"] = brightness;
  doc["Temperature"] = temp;
  serializeJson(doc, JsonData);
  Serial.println(JsonData);

  if (!client.connected())
  {
    mqttReconnect();
  }
  else
  {
    client.publish("Final", JsonData.c_str());//topic,data
    //variable.c_str() -->str to const char
  }
  client.loop();
  delay(2000);

}



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

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("Reply");
    } 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.println(topic);
  Serial.print("Message is :  ");
  String stmsg;
  for (int i = 0; i < length; i++)
  {
    Serial.print((char)message[i]);
    stmsg += (char)message[i];
  }
  Serial.println(stmsg);
  DeserializationError error = deserializeJson(doc1, stmsg);
  if (error)
  {
    Serial.print("Parsing failed: ");
    Serial.println(error.c_str());
    return;
  }
  float Temperature = doc1["Temperature"];
  String Bright = doc1["Brightness"].as<String>();
  String Move = doc1["Motion"].as<String>();

  Serial.println();

  if(Move=="YES" && Bright=="LOW")
     digitalWrite(relay_led, HIGH);
  else 
     digitalWrite(relay_led, LOW);
  if(Temperature>15.0)

     digitalWrite(relay_buzzer, HIGH);
  else
     digitalWrite(relay_buzzer,LOW);
}