#include <WiFi.h>
#include <PubSubClient.h>
#include "DHTesp.h"
#include <NTPClient.h> //to take time
#include <WiFiUdp.h>

#define DHT_PIN 12
#define BUZZER 5
#define LDRPINL A0
#define LDRPINR A3
#define SERVMOTOR 16

WiFiClient espClient;
PubSubClient mqttClient(espClient);

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP);

char tempAr[6];

DHTesp dhtSensor;

bool isScheduledON= false;
unsigned long scheduledOnTime;


void setup() {

  Serial.begin(115200);
  setupWiFi();
  setupMqtt();

  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);

  timeClient.begin();
  timeClient.setTimeOffset(5.5 * 3600);  

  
  pinMode(BUZZER, OUTPUT);
  digitalWrite(BUZZER,LOW);

  

}

void loop() {
  if(!mqttClient.connected()){
    connectToBroker();
  }
  mqttClient.loop();


  updateTemperature();
  Serial.println(tempAr);
  mqttClient.publish("ENTC-ADMIN-TEMP", tempAr);

  checkSchedule();
  delay(1000);
  

}


void buzzerOn(bool on){
  if (on){
    tone(BUZZER,256);

  }else{
    noTone(BUZZER);
  }
}

void setupMqtt(){
  mqttClient.setServer("test.mosquitto.org",1883);
  mqttClient.setCallback(receiveCallback);
}

void receiveCallback(char* topic,byte* payload, unsigned int length){
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");

  char payloadCharAr[length];
  for (int i=0; i<length; i++){
    Serial.print((char)payload[i]);
    payloadCharAr[i]=(char)payload[i];
  }

  Serial.println();



  if (strcmp(topic, "ENTC-ADMIN-MAIN-ON-OFF")==0){
    buzzerOn(payloadCharAr[0]=='1');
  }else if(strcmp(topic, "ENTC-ADMIN-SCH-ON")==0){
    if(payloadCharAr[0]=='N'){
      isScheduledON = false;
    }else{
      isScheduledON = true;
      scheduledOnTime=atol(payloadCharAr);

    }
  }

  

}
void connectToBroker(){
  while (!mqttClient.connected()){
    Serial.print("Attempting MQTT connection...");
    if(mqttClient.connect("ESP32- 12345645454")){
      Serial.println("connected ");
      mqttClient.subscribe("ENTC-ADMIN-MAIN-ON-OFF");
      mqttClient.subscribe("ENTC-ADMIN-SCH-ON");

      //subscribe
    }else{
      Serial.print("failed ");
      Serial.print(mqttClient.state());
      delay(5000);
    }
  }
}

void updateTemperature(){
  TempAndHumidity data = dhtSensor.getTempAndHumidity();
  String(data.temperature,2).toCharArray(tempAr,6);
}

void setupWiFi(){
  Serial.println();
  Serial.print("Connecting to WiFi");
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Connected!");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());


}

unsigned long getTime(){
  timeClient.update();
  return timeClient.getEpochTime();
}

void checkSchedule(){
  if(isScheduledON){
    unsigned long currentTime = getTime();
    if (currentTime > scheduledOnTime ){
      buzzerOn(true);
      isScheduledON= false;
      mqttClient.publish("ENTC-ADMIN-MAIN-ON-OFF-ESP","1");
      mqttClient.publish("ENTC-ADMIN-SCH-ESP-ON","0");

      Serial.println("Scheduled ON");



    }


  }

}