#include <WiFi.h>
#include "ThingSpeak.h"
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"
#include <SoftwareSerial.h>

WiFiClient client;

const char* WIFI_NAME = "Wokwi-GEUST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber =2523065 ;
const char* writeApiKey = "MR60I1WU78ZCQGZ8";
const char* server = "api.thingspeak.com";
int statusCode = 0;
byte LED=1;

#define AIO_SERVER      "io.adafruit.com"
#define AIO_SERVERPORT  1883
#define AIO_USERNAME    "Arulx06"
#define AIO_KEY         "aio_xOlw169GloaVdNjYsUSjcR68pQJ2" 

Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);
Adafruit_MQTT_Subscribe light = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME "/feeds/light");

void setup() {
  // put your setup code here, to run once:
  Serial1.begin(115200);
  Serial1.println("Wifi not connected");
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  pinMode(13, OUTPUT);
  while (WiFi.status() != WL_CONNECTED){
    delay(1000);
    Serial1.println("Wifi not connected");
  }

  Serial1.println("Wifi connected !");
  Serial1.println("Local IP: ");
  Serial1.println(WiFi.localIP().toString());
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
  connect();
  mqtt.subscribe(&light);
}

void connect() {
  Serial1.print("Connecting to MQTT...");
  int8_t ret;

  while ((ret = mqtt.connect()) != 0) {
    Serial1.println(mqtt.connectErrorString(ret));
    Serial1.println("Retrying MQTT connection...");
    delay(5000);
  }

  Serial1.println("Connected to MQTT");
}

void loop() {
     if(! mqtt.ping(3)) {
    // reconnect to adafruit io
    if(! mqtt.connected())
      connect();
  }
  // These constants should match the photoresistor's "gamma" and "rl10" attributes
const float GAMMA = 0.7;
const float RL10 = 50;

// Convert the analog value into lux value:
int analogValue = analogRead(27);
float voltage = analogValue / 1024. * 5;
float resistance = 2000 * voltage / (1 - voltage / 5);
float Lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));

  ThingSpeak.setField(1,Lux);

  int status = ThingSpeak.writeFields(myChannelNumber, writeApiKey);
  
  if (status == 200) {
    Serial1.println("Data sent to ThingSpeak successfully");
  } else {
    Serial1.println("Failed to send data to ThingSpeak");
  }
  Adafruit_MQTT_Subscribe *subscription;
  while ((subscription = mqtt.readSubscription(5000))) {
    if (subscription == &light) {
      Serial1.print("Received Feed Value: ");
      Serial1.println((char *)light.lastread);
      uint8_t ledState = *light.lastread;
      LED = ledState;
      Serial1.print(LED);
    }
  }
    /* getting on or off condition from user from application via thinkspeak
         if 1 is sent the light wont glow if 0 is sent the light glows*/
      if(LED==0)
      {
        digitalWrite(13,LOW);
        Serial1.println(Lux);
      }
      if(LED==1){
        if(Lux<100){
          digitalWrite(13,HIGH);
          Serial1.println(Lux);
        }else{
          digitalWrite(13,LOW);
          Serial1.println(Lux);
        }
      }

  
}