// فاطمه ابو بكر سامبا 251001974 - Smart Home Automation System
import 'dart:io';

class SmartHome {
  bool lightsOn = false;
  int temperature = 20;
  bool securityArmed = false;

  void toggleLights() {
    lightsOn = !lightsOn;
    print('Lights are now ${lightsOn ? "ON" : "OFF"}');
  }

  void setTemperature(int newTemp) {
    if (newTemp < 15 || newTemp > 30) {
      print('Invalid temperature! Please enter between 15°C and 30°C.');
    } else {
      temperature = newTemp;
      print('Temperature set to $temperature°C');
      fizzBuzzTemperature();
    }
  }

  void toggleSecurity() {
    securityArmed = !securityArmed;
    print('Security system is now ${securityArmed ? "ARMED" : "DISARMED"}');
  }

  void viewStatus() {
    print('\n--- System Status ---');
    print('Lights: ${lightsOn ? "ON" : "OFF"}');
    print('Temperature: $temperature°C');
    print('Security: ${securityArmed ? "ARMED" : "DISARMED"}');
  }

  void fizzBuzzTemperature() {
    if (temperature % 3 == 0 && temperature % 5 == 0) {
      print("Perfect Day! Temperature: $temperature°C");
    } else if (temperature % 3 == 0) {
      print("Cool Day! Temperature: $temperature°C");
    } else if (temperature % 5 == 0) {
      print("Warm Day! Temperature: $temperature°C");
    }
  }
}

void main() {
  final system = SmartHome();
  while (true) {
    print('\nWelcome to the Smart Home System!');
    print('1. Turn lights ON/OFF');
    print('2. Set thermostat temperature');
    print('3. Arm/Disarm security system');
    print('4. View system status');
    print('5. Exit');
    stdout.write('Enter your choice: ');
    String? choice = stdin.readLineSync();

    switch (choice) {
      case '1':
        system.toggleLights();
        break;
      case '2':
        stdout.write('Enter new temperature (15–30): ');
        int? temp = int.tryParse(stdin.readLineSync() ?? '');
        if (temp != null) system.setTemperature(temp);
        break;
      case '3':
        system.toggleSecurity();
        break;
      case '4':
        system.viewStatus();
        break;
      case '5':
        print('Exiting the system. Goodbye!');
        return;
      default:
        print('Invalid choice. Please try again.');
    }
  }
}