#include <DHTesp.h>

#define BLYNK_TEMPLATE_ID           "TMPL6wWb6IXN8"
#define BLYNK_TEMPLATE_NAME         "Quickstart Template"
#define BLYNK_AUTH_TOKEN            "Bb8VhNhD9dpKcisPsMHwwy-_2tkjOaOm"

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <BlynkSimpleEsp32.h>
#include <WiFi.h>
#include <WiFiClient.h>

const int DHTPIN = 15;  // Pin where you connect the output of the DHT22 sensor

DHTesp dhtSensor;

LiquidCrystal_I2C lcd(0x27, 16, 2);  // I2C LCD address and number of columns and rows

#define RELAY_PIN_2 25 // Pin for Relay 2

bool fanStatus = false; // variable to store the fan status

char ssid[] = "Wokwi-GUEST"; // replace xxx with your wifi ssid
char pass[] = ""; // replace xxx with your wifi password

void setup() {
  Serial.begin(115200);
  dhtSensor.setup(DHTPIN, DHTesp::DHT22);

  lcd.init();  // Initialize LCD
  lcd.backlight();

  pinMode(RELAY_PIN_2, OUTPUT);

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
}

BLYNK_CONNECTED() {
  Blynk.syncVirtual(V2);  // Request the current state of the button (V2) from the server
}

BLYNK_WRITE(V2) {
  int buttonState = param.asInt();
  fanStatus = buttonState;

  if (fanStatus == 1) {
    controlRelays(0);
  }
}

BLYNK_WRITE(V3) {
  Serial.println("Historical Graph Updated");
}

void loop() {
  Blynk.run();
  delay(2000);  // Delay before reading the sensor
  float temperature = dhtSensor.getTemperature();  // Read temperature from the DHT22 sensor
  float humidity = dhtSensor.getHumidity();  // Read humidity from the DHT22 sensor

  if (!isnan(temperature) && !isnan(humidity)) {
    Blynk.virtualWrite(V0, temperature);
    Blynk.virtualWrite(V1, humidity);
    Blynk.virtualWrite(V3, temperature);
    Blynk.virtualWrite(V3, humidity);

    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.print(" C | Humidity: ");
    Serial.print(humidity);
    Serial.print(" % | Fan Status: ");

    displayTemperature(temperature, humidity);
    controlRelays(temperature);
  }
  delay(2000);   // Delay before reading the sensor again
}

void displayTemperature(float temperature, float humidity) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");

  lcd.setCursor(0, 1);
  lcd.print("Humid: ");
  lcd.print(humidity);
  lcd.print(" %");

  delay(2000);
}

void controlRelays(float temperature) {
  if (temperature >= 25.0 || fanStatus) {
    lcd.clear();
    digitalWrite(RELAY_PIN_2, HIGH);
    lcd.setCursor(0, 1);
    lcd.print("FAN ON");
    Blynk.virtualWrite(V2, 1);
    Serial.println("ON");
  } else {
    digitalWrite(RELAY_PIN_2, LOW);
    delay(3000);
    Blynk.virtualWrite(V2, 0);
    Serial.println("OFF");
  }
}