#define BLYNK_TEMPLATE_ID "***********"
#define BLYNK_DEVICE_NAME "Home Automation"
#define BLYNK_AUTH_TOKEN "********************"

#define BLYNK_PRINT Serial

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

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";   // Your WiFi SSID
char pass[] = "";              // Your WiFi Password

BlynkTimer timer;

// Define Button and Relay Pins
#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

// Virtual Pins for Blynk App
#define button1_vpin V1
#define button2_vpin V2
#define button3_vpin V3
#define button4_vpin V4

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

// Sync latest state from Blynk Cloud
BLYNK_CONNECTED() {
  Blynk.syncVirtual(button1_vpin);
  Blynk.syncVirtual(button2_vpin);
  Blynk.syncVirtual(button3_vpin);
  Blynk.syncVirtual(button4_vpin);
}

// Blynk App Controls
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() {
  Serial.begin(115200);
  
  // Initialize Buttons as INPUT_PULLUP
  pinMode(button1_pin, INPUT_PULLUP);
  pinMode(button2_pin, INPUT_PULLUP);
  pinMode(button3_pin, INPUT_PULLUP);
  pinMode(button4_pin, INPUT_PULLUP);

  // Initialize Relays as OUTPUT (Active LOW)
  pinMode(relay1_pin, OUTPUT);
  pinMode(relay2_pin, OUTPUT);
  pinMode(relay3_pin, OUTPUT);
  pinMode(relay4_pin, OUTPUT);

  // Ensure all relays start OFF
  digitalWrite(relay1_pin, HIGH);
  digitalWrite(relay2_pin, HIGH);
  digitalWrite(relay3_pin, HIGH);
  digitalWrite(relay4_pin, HIGH);

  // Connect to Blynk Cloud
  Blynk.begin(auth, ssid, pass);
  
  timer.setInterval(200L, listen_push_buttons); // Check button state every 200ms
}

void loop() {
  Blynk.run();
  timer.run();
}

// Function to Listen for Push Button Press
void listen_push_buttons() {
  if (digitalRead(button1_pin) == LOW) {
    delay(50); // Debounce
    toggle_relay(1);
    Blynk.virtualWrite(button1_vpin, relay1_state);
  }
  if (digitalRead(button2_pin) == LOW) {
    delay(50);
    toggle_relay(2);
    Blynk.virtualWrite(button2_vpin, relay2_state);
  }
  if (digitalRead(button3_pin) == LOW) {
    delay(50);
    toggle_relay(3);
    Blynk.virtualWrite(button3_vpin, relay3_state);
  }
  if (digitalRead(button4_pin) == LOW) {
    delay(50);
    toggle_relay(4);
    Blynk.virtualWrite(button4_vpin, relay4_state);
  }
}

// Function to Toggle Relay State
void toggle_relay(int relay) {
  if (relay == 1) {
    relay1_state = !relay1_state;
    digitalWrite(relay1_pin, relay1_state);
    Serial.print("Relay 1 State: ");
    Serial.println(relay1_state);
  } else if (relay == 2) {
    relay2_state = !relay2_state;
    digitalWrite(relay2_pin, relay2_state);
    Serial.print("Relay 2 State: ");
    Serial.println(relay2_state);
  } else if (relay == 3) {
    relay3_state = !relay3_state;
    digitalWrite(relay3_pin, relay3_state);
    Serial.print("Relay 3 State: ");
    Serial.println(relay3_state);
  } else if (relay == 4) {
    relay4_state = !relay4_state;
    digitalWrite(relay4_pin, relay4_state);
    Serial.print("Relay 4 State: ");
    Serial.println(relay4_state);
  }
}