void main() {
  // System defaults
  bool lightsOn = false;
  int temperature = 25;
  bool securityArmed = false;

  
  List<String> simulatedInputs = ['1', '2', '25', '4', '5'];
  int inputIndex = 0;

  print('Welcome to the Smart Home System!');
  print('Please choose an action:');
  print('1. Toggle lights');
  print('2. Set thermostat temperature');
  print('3. Arm/disarm security system');
  print('4. View system status');
  print('5. Exit');

  while (inputIndex < simulatedInputs.length) {
    String choice = simulatedInputs[inputIndex];
    print('\nEnter Your choice: $choice');
    inputIndex++;

    switch (choice) {
      case '1':
        lightsOn = !lightsOn;
        print('Lights are now ${lightsOn ? 'ON' : 'OFF'}.');
        break;

      case '2':
        String tempInput = simulatedInputs[inputIndex];
        inputIndex++;
        print('Set thermostat temperature (15°C - 30°C): $tempInput');
        int? inputTemp = int.tryParse(tempInput);
        if (inputTemp != null && inputTemp >= 15 && inputTemp <= 30) {
          temperature = inputTemp;
          print('Temperature set to $temperature°C.');
        } else {
          print(' Invalid temperature!');
        }
        break;

      case '3':
        securityArmed = !securityArmed;
        print('Security system is now ${securityArmed ? 'ARMED' : 'DISARMED'}.');
        break;

      case '4':
        String dayType = '';
        if (temperature % 3 == 0 && temperature % 5 == 0) {
          dayType = ' - Perfect Day ';
        } else if (temperature % 3 == 0) {
          dayType = ' - Cool Day ';
        } else if (temperature % 5 == 0) {
          dayType = ' - Warm Day ';
        }

        print('System Status:');
        print('- Lights: ${lightsOn ? 'ON' : 'OFF'}');
        print('- Thermostat: $temperature°C$dayType');
        print('- Security System: ${securityArmed ? 'ARMED' : 'DISARMED'}');
        break;

      case '5':
        print('Exiting the system. Goodbye!');
        return;

      default:
        print('Invalid choice!');
    }
  }
}