#define BLYNK_TEMPLATE_ID "TMPL6ILB77YxK"
#define BLYNK_TEMPLATE_NAME "Home Automation"
#define BLYNK_AUTH_TOKEN "FZE3bFXaziDMlFegp8uuKO-PavpWUuFS"

#define BLYNK_PRINT Serial

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

#include <Wire.h>
#include <LiquidCrystal_I2C.h>  // Include I2C LCD library
#include <DHT.h>

char auth[] = BLYNK_AUTH_TOKEN;

// WiFi credentials.
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

BlynkTimer timer;

#define DHTPIN 15  // Pin connected to the DHT sensor
#define DHTTYPE DHT22 // DHT 22 sensor type
#define LEDPIN 5    // Pin connected to the LED

#define LCD_ADDRESS 0x27  //  LCD's I2C address
#define LCD_ROWS 2        // Number of LCD rows
#define LCD_COLUMNS 16    // Number of LCD columns

LiquidCrystal_I2C lcd(LCD_ADDRESS, LCD_ROWS, LCD_COLUMNS); //LCD object

DHT dht(DHTPIN, DHTTYPE);

#define button1_pin 26
#define button2_pin 25
#define button3_pin 33
#define button4_pin 32

#define relay1_pin 13
#define relay2_pin 12
#define relay3_pin 14
#define relay4_pin 27

int relay1_state = 0;
int relay2_state = 0;
int relay3_state = 0;
int relay4_state = 0;


// virtual pins according the rooms
#define button1_vpin    V1
#define button2_vpin    V2
#define button3_vpin    V3 
#define button4_vpin    V4

// This function is called every time the device is connected to the Blynk.Cloud
BLYNK_CONNECTED() {
  Blynk.syncVirtual(button1_vpin);
  Blynk.syncVirtual(button2_vpin);
  Blynk.syncVirtual(button3_vpin);
  Blynk.syncVirtual(button4_vpin);
}

// This function is called every time the Virtual Pin state change
BLYNK_WRITE(button1_vpin) {
  relay1_state = param.asInt();
  digitalWrite(relay1_pin, relay1_state);
}

BLYNK_WRITE(button2_vpin) {
  relay2_state = param.asInt();
  digitalWrite(relay2_pin, relay2_state);
}

BLYNK_WRITE(button3_vpin) {
  relay3_state = param.asInt();
  digitalWrite(relay3_pin, relay3_state);
}

BLYNK_WRITE(button4_vpin) {
  relay4_state = param.asInt();
  digitalWrite(relay4_pin, relay4_state);
}

//--------------------------------------------------------------------------

void setup()
{
  // Debug console
  Serial.begin(115200);

  pinMode(button1_pin, INPUT_PULLUP);
  pinMode(button2_pin, INPUT_PULLUP);
  pinMode(button3_pin, INPUT_PULLUP);
  pinMode(button4_pin, INPUT_PULLUP);
  
  pinMode(relay1_pin, OUTPUT);
  pinMode(relay2_pin, OUTPUT);
  pinMode(relay3_pin, OUTPUT);
  pinMode(relay4_pin, OUTPUT);
  
  //During Starting all Relays should TURN OFF
  digitalWrite(relay1_pin, HIGH);
  digitalWrite(relay2_pin, HIGH);
  digitalWrite(relay3_pin, HIGH);
  digitalWrite(relay4_pin, HIGH);
  
  Blynk.begin(auth, ssid, pass);
  pinMode(LEDPIN, OUTPUT); // Set LED pin as output
  Serial.begin(9600);      // Initialize serial communication for debugging
  dht.begin();             // Initialize DHT sensor
  lcd.init();              // Initialize LCD display
  lcd.backlight();         // Turn on backlight (optional)

}

void loop()
{
  Blynk.run();
  timer.run();
  
  listen_push_buttons();
  
  // Read temperature from the sensor
  float temp = dht.readTemperature();
  float humidity = dht.readHumidity();

  
  // Check if reading was successful
  if (isnan(temp) || isnan(humidity)){
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Control LED based on temperature
  if (temp > 40) {
    digitalWrite(LEDPIN, HIGH); // Turn on LED
  } else {
    digitalWrite(LEDPIN, LOW); // Turn off LED
  }

  // Display temperature on LCD
  lcd.clear();
  lcd.print("Temp: ");
  lcd.print(temp);  
  lcd.print(" C ");
  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print("%");

  delay(1000); 
}


void listen_push_buttons(){
   
    if(digitalRead(button1_pin) == LOW){
      delay(50);
      control_relay(1);
      Blynk.virtualWrite(button1_vpin, relay1_state); //update button state
    }
   
    else if (digitalRead(button2_pin) == LOW){
      delay(50);
      control_relay(2);
      Blynk.virtualWrite(button2_vpin, relay2_state); //update button state
    }

    else if (digitalRead(button3_pin) == LOW){
      delay(50);
      control_relay(3);
      Blynk.virtualWrite(button3_vpin, relay3_state); //update button state
    }
  
    else if (digitalRead(button4_pin) == LOW){
      delay(50);
      control_relay(4);
      Blynk.virtualWrite(button4_vpin, relay4_state); //update button state
    }
    
}

void control_relay(int relay){
  
  if(relay == 1){
    relay1_state = !relay1_state;
    digitalWrite(relay1_pin, relay1_state);
    Serial.print("Relay1 State = ");
    Serial.println(relay1_state);
  
  }
 
  else if(relay == 2){
    relay2_state = !relay2_state;
    digitalWrite(relay2_pin, relay2_state);
    Serial.print("Relay2 State = ");
    Serial.println(relay2_state);
   
  }

  else if(relay == 3){
    relay3_state = !relay3_state;
    digitalWrite(relay3_pin, relay3_state);
    Serial.print("Relay3 State = ");
    Serial.println(relay3_state); 
    
  }
  
  else if(relay == 4){
    relay4_state = !relay4_state;
    digitalWrite(relay4_pin, relay4_state);
    Serial.print("Relay4 State = ");
    Serial.println(relay4_state);
    
  }
  
}