// Blynk credentials
#define BLYNK_TEMPLATE_ID "TMPL6x8Vs3KDg"
#define BLYNK_TEMPLATE_NAME "EEE379"
#define BLYNK_AUTH_TOKEN "eZK_4MZiSChneFmn1ngC-VRdEyLUQDqm"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// Pin definitions
const int mq135Pin = A0;  // GPIO pin for ADC reading on ESP32
const int ledGreen = 14;
const int ledYellow = 12;
const int ledRed = 27;
const int buzzer = 4;
const int relay = 33;

// Variables to store state
BlynkTimer timer;

void setup() {
  Serial.begin(9600);
  Blynk.begin(auth, ssid, pass);

  pinMode(mq135Pin, INPUT);
  pinMode(ledGreen, OUTPUT);
  pinMode(ledYellow, OUTPUT);
  pinMode(ledRed, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(relay, OUTPUT);

  digitalWrite(ledGreen, LOW);
  digitalWrite(ledYellow, LOW);
  digitalWrite(ledRed, LOW);
  digitalWrite(buzzer, LOW);
  digitalWrite(relay, LOW);
  
  lcd.init();
  lcd.backlight();
  
  // Setup a function to be called every second
  timer.setInterval(1000L, checkAirQuality);
}

void checkAirQuality() {
  int airQualityRaw = analogRead(mq135Pin);
  int airQualityPercentage = map(airQualityRaw, 0, 4095, 0, 100);  // ESP32 ADC is 12-bit (0-4095)

  lcd.setCursor(0,0);
  lcd.print("Air Quality (%):");
  lcd.setCursor(7,1);
  lcd.println(airQualityPercentage);

  
  if (airQualityPercentage < 20) {
    // Poor air quality
    digitalWrite(ledGreen, LOW);
    digitalWrite(ledYellow, LOW);
    digitalWrite(ledRed, HIGH);
    analogWrite(buzzer, 5200);
    digitalWrite(relay, HIGH);
    lcd.clear();
    lcd.setCursor(2,0);
    lcd.print("No Smoking In");
    lcd.setCursor(2,1);
    lcd.print("This Area!!!");
    delay(5000);
    lcd.clear();
  } else if (airQualityPercentage >= 20 && airQualityPercentage < 80) {
    // Moderate air quality
    digitalWrite(ledGreen, LOW);
    digitalWrite(ledYellow, HIGH);
    digitalWrite(ledRed, LOW);
    digitalWrite(buzzer, LOW);
    digitalWrite(relay, LOW);
  } else {
    // Good air quality
    digitalWrite(ledGreen, HIGH);
    digitalWrite(ledYellow, LOW);
    digitalWrite(ledRed, LOW);
    digitalWrite(buzzer, LOW);
    digitalWrite(relay, LOW); 
  }

  // Blynk virtual writes
  Blynk.virtualWrite(V1, airQualityPercentage);

  if (airQualityPercentage < 20) {
    Blynk.virtualWrite(V2, 0);      //Green
    Blynk.virtualWrite(V3, 0);      //Yellow
    Blynk.virtualWrite(V4, 255);    //Red
    Blynk.logEvent("smoke_activities_detected","Smoking activities detected in no smoking area !");
  } else if (airQualityPercentage >= 20 && airQualityPercentage < 80) {
    Blynk.virtualWrite(V2, 0);   
    Blynk.virtualWrite(V3, 255); 
    Blynk.virtualWrite(V4, 0);   
  } else {
    Blynk.virtualWrite(V2, 255);   
    Blynk.virtualWrite(V3, 0);   
    Blynk.virtualWrite(V4, 0); 
  }
}


BLYNK_WRITE(V5) {
  int pinValue = param.asInt(); // Get value as integer

  if (pinValue == 1) {
    digitalWrite(relay, HIGH);  // Turn on air purifier
    delay(5000);
  } else {
    digitalWrite(relay, LOW);   // Turn off air purifier
  }
}

void loop() {
  Blynk.run();
  timer.run(); // Initiates BlynkTimer
}