#include <WiFi.h>
#include <WiFiClient.h>
#include <PubSubClient.h>

int GLED = 18;

const char* ssid = "Wokwi-GUEST";	// Given by Wokwi
const char* password = "";	// no password
const char* hostname = "broker.hivemq.com"; // MQTT broker address that we are connecting


//Initializes the espClient
WiFiClient espClient;
PubSubClient client(espClient);
const char* espClientName = "esp32Client_StudentID";
int PORTNUM = 1883;



void setup_wifi()
{
  WiFi.begin(ssid, password);
  while(WiFi.status() != WL_CONNECTED )
  {
    delay(1000);
    Serial.print(".");
  }
  Serial.println();
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("Given IP by the router to ESP32 is ");
  Serial.println(WiFi.localIP());
}


void connectMQTT()
{
  while(!client.connected() )
  {
    Serial.println("Connecting to MQTT ...");
    if (client.connect(espClientName) ) //, mqttUser, mqttPassword) )
    {
      Serial.println("Connected");
      MQTTSubscribe();
    }
    else
    {
      Serial.print("Failed with state ");
      Serial.print(client.state() );
      delay(2000);
    }
  }
}


void setup_MQTT()
{
  client.setServer(hostname, PORTNUM);
  client.setCallback(callback); 
}



void MQTTSubscribe()
{
   client.subscribe("sph2/room/LED");
}


void callback(String topic, byte* payload, unsigned int length)
{
	String messageTemp;
  Serial.print("Message received in topic: ");
  Serial.print(topic);
  Serial.print(" length is: ");
  Serial.println(length);

  Serial.print("Data received from broker: ");
  for (int i = 0; i<length; i++)
  {
    Serial.print( (char)payload[i] );
    messageTemp += (char)payload[i];
  }

  if (topic == "Times ")
 	{
    Serial.print("Changing room LED to ");
	if (messageTemp == "off")
  {
    digitalWrite(GLED, LOW);
    Serial.print("off");
  }
  else if (messageTemp == "On")
  {
   digitalWrite(GLED, LOW);
   Serial.begin ("on");
  }
 }
}