#define BLYNK_TEMPLATE_ID "TMPL2Na-Eb8sK"
#define BLYNK_TEMPLATE_NAME "Temperature and Humidity Monitor"
#define BLYNK_AUTH_TOKEN "AbQ5JuSGQjKTZvo9eMIPJbL-OP1wFtDz"

#include <WiFi.h>              // Include Wi-Fi library
#include <BlynkSimpleEsp32.h>  // Include Blynk ESP32 library
#include <DHT.h>               // Include DHT library
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Wi-Fi credentials
#define WIFI_SSID "Wokwi-GUEST" // Use Wokwi-Guest for Wokwi simulator
#define WIFI_PASSWORD ""        // Empty password for Wokwi

// DHT sensor pin and type
#define DHTPIN 4
#define DHTTYPE DHT22

// Potentiometer pin
#define POT_PIN 34 // Pin connected to Potentiometer

// Initialize DHT sensor and LCD
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 20, 4);

// Variables for sensor data
float temperature;
float humidity;
int airQuality = 0;

// Simulated variables for testing
float simulatedTemp = 24.0;
float simulatedHum = 40.0;

void connectToWiFi() {
  Serial.println("Connecting to Wi-Fi...");
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);

  int retryCount = 0;
  while (WiFi.status() != WL_CONNECTED && retryCount < 20) {
    delay(1000);
    Serial.print(".");
    retryCount++;
  }

  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("\nWi-Fi connected!");
  } else {
    Serial.println("\nWi-Fi connection failed.");
    while (true) {
      delay(1000);
    }
  }
}

void setup() {
  lcd.begin(20, 4);    // Initialize 20x4 LCD
  lcd.init();            // Initialize the LCD
  lcd.backlight();       // Turn on LCD backlight
  Serial.begin(115200);  // Start serial for debugging
  dht.begin();           // Initialize the DHT sensor
  connectToWiFi();       // Connect to Wi-Fi
  Blynk.begin(BLYNK_AUTH_TOKEN, WIFI_SSID, WIFI_PASSWORD); // Connect to Blynk
}

void loop() {
  Blynk.run();

  // Simulate changes in temperature and humidity
  simulatedTemp += random(-10, 11) / 10.0; // Random change between -1.0 and +1.0
  simulatedHum += random(-5, 6) / 10.0;    // Random change between -0.5 and +0.5

  // Clamp simulated values to realistic ranges
  if (simulatedTemp < 15) simulatedTemp = 15;
  if (simulatedTemp > 35) simulatedTemp = 35;
  if (simulatedHum < 20) simulatedHum = 20;
  if (simulatedHum > 80) simulatedHum = 80;

  // Read potentiometer value and map to air quality range
  int potValue = analogRead(POT_PIN);         // Read potentiometer value (0-4095)
  airQuality = map(potValue, 0, 4095, 200, 400); // Map value to air quality range (200-400)

  // Simulate the effect of air quality on temperature
  if (airQuality < 250) {
    simulatedTemp += 0.5;  // Higher temperature with worse air quality
  } else {
    simulatedTemp -= 0.5;  // Lower temperature with better air quality
  }

  // Display temperature on LCD (Row 1)
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(simulatedTemp); // Use simulatedTemp instead of temperature
  lcd.print("C");

  // Display humidity on LCD (Row 2)
  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(simulatedHum); // Use simulatedHum instead of humidity
  lcd.print("%");

  // Display air quality on LCD (Row 3)
  lcd.setCursor(0, 2);
  lcd.print("Air Quality: ");
  lcd.print(airQuality);

  // Send data to Blynk
  Blynk.virtualWrite(V0, simulatedTemp);  // Use simulatedTemp for Blynk
  Blynk.virtualWrite(V1, simulatedHum);   // Use simulatedHum for Blynk
  Blynk.virtualWrite(V2, airQuality);

  // Log data to Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(simulatedTemp);
  Serial.print(" C, Humidity: ");
  Serial.print(simulatedHum);
  Serial.print(" %, Air Quality: ");
  Serial.print(airQuality);
  Serial.print(" (Pot Value: ");
  Serial.print(potValue);
  Serial.println(")");

  delay(2000); // Wait before next update
}