/*	Lab Trial Test 
 *	Name:	Eunice Santamina
 * Class: DEEC1(B)
 *	Date: 12/07/24
*/ 
#include <WiFi.h>
#include <WiFiClient.h>
#include <PubSubClient.h>

int LEDState = 1;
int interval = 2000;
long previousMillis = 0;
int intervalA = 500;
long previousMillisA = 0;
#define ADC_IN A5
#define ADC_REF 3.3


const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* hostname = "broker.hivemq.com";

WiFiClient espClient;
PubSubClient client(espClient);
const char* espClientName = "esp32Client_10145291"; // yourStudentID must be unique
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 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 == "IoT/2198663T/10145291")
  {
    Serial.print("Changing room LED to ");
    if (messageTemp == "0")
    {
      digitalWrite(19,LOW);
    }
    else
    {
      digitalWrite(19,HIGH);
    }
  }
}

void MQTTSubscribe() 
{
  client.subscribe("IoT/2198663T/10145291");
}

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

}

void setup() 
{
  Serial.begin(115200);
  pinMode(19,OUTPUT);  
  pinMode(23,OUTPUT);
  setup_wifi();
  setup_MQTT();
}

void loop() 
{
  long currentMillis = millis();
  if (currentMillis - previousMillis >= interval)
  {
    previousMillis = currentMillis;
    if (LEDState == LOW)
    {
      LEDState = HIGH;
      Serial.print("Off");
    }
    else
    {
      LEDState = LOW;
      Serial.print("On");
    }
    digitalWrite(23, LEDState);
  }

  long currentMillisA = millis();
  if (currentMillisA - previousMillisA >= intervalA)
  {
    previousMillisA = currentMillisA;
    int adcRes = analogRead( ADC_IN );
    Serial.println(adcRes);
    Serial.print("Analog Reading: ");

    String payload = String(adcRes);
    client.publish("IoT/2198663T/10145291", payload.c_str());
  }
  

  if ( !client.connected() )
  {
    connectMQTT();
  }
  client.loop();
}