/* Project Aug 2024
 * Name: Gan Lin
 * class: B
 * Date: 1st Aug 2024
*/

int led =23;             //LED is connected to esp32 D23
int pirdata =15;         //pir D is connected to D15
int pirstate =LOW;       // assuming no motion
int value =0;            // to read pin status
#define Buzzer 4         // Buzzer connected to D4

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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* hostname = "broker.hivemq.com";

WiFiClient espClient;
PubSubClient client(espClient);
const char* espClientName = "esp32Client_S10251644B";
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) )
    {
      Serial.println("Connected");
      client.subscribe("Candice/10251644/motion");  // Subscribe to motion topic
    }
    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("Message: ");
  for (int i = 0; i<length; i++)
  {
    Serial.print( (char)payload[i] );
    messageTemp += (char)payload[i];
  }
  Serial.println();

  // Perform actions based on the message received
  if (String(topic) == "Candice/10251644/motion")
  {
    if (messageTemp == "ON")
    {
      digitalWrite(led, HIGH);  //Turn on LED
      Serial.println("LED turned ON");
    }
    else if (messageTemp == "OFF")
    {
      digitalWrite(led, LOW);  //Turn off LED
      Serial.println("LED turned OFF");
    }
  }
}

void MQTTSubscribe() 
{
 
}

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

void setup()
{
  Serial.begin(115200);
  Serial.println("Hello Buzz!");
  pinMode(pirdata, INPUT);
  pinMode(led, OUTPUT);     // LED as output
  pinMode(Buzzer, OUTPUT);

  setup_wifi();
  setup_MQTT();
}

void loop()
{
  value = digitalRead(pirdata);  //Reading status of sensor pin
  if (value == HIGH)         // If motion detected
  {
    if (pirstate == LOW)
    {
      Serial.println("motion detected ...");
      pirstate = HIGH;
      client.publish("Candice/10251644/motion","ON");  //Publish motion detected
      tone(Buzzer, 1000); // Activate buzzer at 1000Hz
      delay(500); // Buzz for 500ms (adjust as needed)
    }
    else
    {
    if (pirstate == HIGH)
      {
      Serial.println("no motion ...");
      
      pirstate = LOW;
      client.publish("Candice/10251644/motion","OFF"); //Publish no motion
      noTone(Buzzer); // Turn off buzzer
      }
 
    }
  }

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

}