#include <WiFi.h> //library for wifi
#include <PubSubClient.h> //library for MQtt 
#include <time.h>
#include "DHT.h" // Library for dht11
#define DHTPIN 15  // what pin we're connected to
#define DHTTYPE DHT22  // define type of sensor DHT 11
#define LED 2

DHT dht (DHTPIN, DHTTYPE); // creating the instance by passing pin and typr of dht connected

void callback(char* subscribetopic, byte* payload, unsigned int payloadLength); 

//-------credentials of IBM Accounts------
#define ORG "1s2adz"//IBM ORGANITION ID
#define DEVICE_TYPE "ardiuno"//Device type mentioned in ibm watson IOT Platform
#define DEVICE_ID "0910"//Device ID mentioned in ibm watson IOT Platform
#define TOKEN "12345678" //Token
String data3;
float h, t;


//-------- Customise the above values --------
char server[] = ORG ".messaging.internetofthings.ibmcloud.com"; // Server Name
char publishTopic[] = "iot-2/evt/Data/fmt/json"; // topic name and type of event perform and format in which data to be send
char subscribetopic[] = "iot-2/cmd/command/fmt/String"; // cmd  REPRESENT command type AND COMMAND IS TEST OF FORMAT STRING
char authMethod[] = "use-token-auth"; // authentication method
char token[] = TOKEN;
char clientId[] = "d:" ORG ":" DEVICE_TYPE ":" DEVICE_ID; //client id


//-----------------------------------------
WiFiClient wifiClient; // creating the instance for wificlient
PubSubClient client(server, 1883, callback ,wifiClient); //calling the predefined client id by passing parameter like server id,portand wificredential

//ADDCODE:.................
bool exhaust_fan_on=false;
bool sprinkler_on=false;
int g=0;
String accident_status="";
String sprinkler_status="";
//ADDCODEend..............

void setup() // configureing the ESP32 
{
  Serial.begin(9600);
  dht.begin();
  pinMode(LED,OUTPUT);
  delay(10);
  Serial.println();
  wificonnect();
  mqttconnect();
}

void loop() // Recursive Function
{
  //ADDCODE
  g=random(0,300);
  //ADDCODEend

  h = dht.readHumidity();
  t = dht.readTemperature();
  Serial.print("temp:");
  Serial.println(t);
  Serial.print("humid:");
  Serial.println(h);
  Serial.print("gas:");
  Serial.println(g);

  //ADDCODE
  if(t<55 && h>60)
  {
    PublishData(t,h,g);
    Serial.println("Flame Status: NO FIRE");
    Serial.println("Humidity Status: Air is GOOD");
    Serial.println("Sprinkler Status: Sprinkler OFF");
    Serial.println("Air conditioner Status: OFF");
  }
  else if(t>55 && h<60)
  {
    PublishData(t,h,g);
    Serial.println("Flame Status: FIRE IS DETECTED !");
    Serial.println("Gas Status: HARMFUL AIR DETECTED !");
    Serial.println("Sprinkler Status: Sprinkler ON");
    Serial.println("Air conditioner Status: ON");
  }
  else if(t>55 && h>60)
  {
    PublishData(t,h,g);
    Serial.println("Flame Status: FIRE IS DETECTED !");
    Serial.println("Gas Status: AIR IS GOOD");
    Serial.println("Sprinkler Status: Sprinkler ON");
    Serial.println("Air conditioner Status: OFF");
  }
  else if(t<55 && h<60)
  {
    PublishData(t,h,g);
    Serial.println("Gas Status: HARMFUL AIR DETECTED !");
    Serial.println("Flame Status: NO FIRE");
    Serial.println("Air conditioner Status: ON");
    Serial.println("Sprinkler Status: Sprinkler OFF");
  }

  if(g<70)
  {
    Serial.println("Gas Status: NO GAS DETECTED !");
    Serial.println("Exhaust Fan Status: OFF");
  }
  else
  {
    Serial.println("Gas Status: HIGH GAS DETECTED !");
    Serial.println("Exhaust Fan Status: ON");
  }
//ADDCODEend

  PublishData(t, h, g);
  delay(1000);
  if (!client.loop()) {
    mqttconnect();
  }
}



/*.....................................retrieving to Cloud...............................*/

void PublishData(float temp, float humid, float gas) {
  mqttconnect(); //function call for connecting to ibm
  /*
     creating the String in in form JSon to update the data to ibm cloud
  */
  String payload = "{\"temp\":";
  payload += temp;
  payload += "," "\"humid\":";
  payload += humid;
  payload += ",""\"gas\":";
  payload += gas;
  payload += "}";

  
  Serial.print("Sending payload: ");
  Serial.println(payload);

  
  if (client.publish(publishTopic, (char*) payload.c_str())) {
    Serial.println("Publish ok"); // if it sucessfully upload data on the cloud then it will print publish ok in Serial monitor or else it will print publish failed
  } else {
    Serial.println("Publish failed");
  }
  Serial.println("------------------------------------------------");
  
}


void mqttconnect() {
  if (!client.connected()) {
    Serial.print("Reconnecting client to ");
    Serial.println(server);
    while (!!!client.connect(clientId, authMethod, token)) {
      Serial.print(".");
      delay(500);
    }
      
     initManagedDevice();
     Serial.println();
  }
}
void wificonnect() //function defination for wificonnect
{
  Serial.println();
  Serial.print("Connecting to ");

  WiFi.begin("Wokwi-GUEST", "", 6);//passing the wifi credentials to establish the connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void initManagedDevice() {
  if (client.subscribe(subscribetopic)) {
    Serial.println((subscribetopic));
    Serial.println("subscribe to cmd OK");
  } else {
    Serial.println("subscribe to cmd FAILED");
  }
}

void callback(char* subscribetopic, byte* payload, unsigned int payloadLength) 
{
  
  Serial.print("callback invoked for topic: ");
  Serial.println(subscribetopic);
  for (int i = 0; i < payloadLength; i++) {
    //Serial.print((char)payload[i]);
    data3 += (char)payload[i];
  } 
  Serial.println("data: "+ data3); 
  if(data3=="sprinklerON")
  {
Serial.println(data3);
digitalWrite(LED,HIGH);
  }
  else 
  {
Serial.println(data3);
digitalWrite(LED,LOW);
  }
data3="";  
}