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

// Wi-Fi credentials
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// Relay and button pins
const int relayPin = 4;
const int buttonPin = 16;

// LCD setup
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Timer variables
unsigned long startTime;
bool timerActive = false;

void setup() {
  // Initialize serial communication
  Serial.begin(115200);

  // Initialize Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Initialize relay and button
  pinMode(relayPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);

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

void loop() {
  // Check if button is pressed
  if (digitalRead(buttonPin) == LOW && !timerActive) {
    // Activate relay and start timer
    digitalWrite(relayPin, HIGH);
    startTime = millis();
    timerActive = true;

    // Display message on LCD
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Garage Light On");
  }

  // Update timer and LCD
  if (timerActive) {
    unsigned long elapsedTime = millis() - startTime;
    unsigned long remainingTime = 300000 - elapsedTime; // 5 minutes in milliseconds

    if (remainingTime > 0) {
      // Display countdown on LCD
      lcd.setCursor(0, 1);
      lcd.print("Time left: ");
      lcd.print(remainingTime / 1000);
      lcd.print("s");
    } else {
      // Turn off relay and stop timer
      digitalWrite(relayPin, LOW);
      timerActive = false;

      // Clear LCD message
      lcd.clear();
    }
  }
}