import 'dart:io';

void main() {
  bool lightsOn = false;
  int temperature = 22; // Default temperature

  while (true) {
    print("\nSmart Home System");
    print("1. Turn Lights ON/OFF");
    print("2. Set Temperature");
    print("3. Show Status");
    print("4. Exit");

    stdout.write("Enter your choice: ");
    String? choice = stdin.readLineSync();

    if (choice == '1') {
      lightsOn = !lightsOn;
      print("Lights are now ${lightsOn ? 'ON' : 'OFF'}");
    } else if (choice == '2') {
      stdout.write("Enter temperature (15-30): ");
      int? temp = int.tryParse(stdin.readLineSync()!);
      if (temp != null && temp >= 15 && temp <= 30) {
        temperature = temp;
        print("Temperature set to $temperature°C");
      } else {
        print("Invalid temperature! Enter a number between 15 and 30.");
      }
    } else if (choice == '3') {
      print("\nHome Status:");
      print("Lights: ${lightsOn ? 'ON' : 'OFF'}");
      print("Temperature: $temperature°C");
    } else if (choice == '4') {
      print("Exiting...");
      break;
    } else {
      print("Invalid choice, try again.");
    }
  }
}