import 'dart:io';

void main() {
  bool lightsOn = false;
  int thermostat = 20;
  bool securityArmed = false;

  const int minTemperature = 15;
  const int maxTemperature = 30;

  print('Welcome to the Smart Home System!');

  bool isRunning = true;

  while (isRunning) {
    print('\nPlease 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');

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

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

      case '2':
        stdout.write(
          'Set thermostat temperature ($minTemperature°C - $maxTemperature°C): ',
        );
        String? input = stdin.readLineSync();
        int? newTemperature = int.tryParse(input ?? '');

        if (newTemperature != null &&
            newTemperature >= minTemperature &&
            newTemperature <= maxTemperature) {
          thermostat = newTemperature;
          print('Thermostat set to $thermostat°C.');
        } else {
          print(
            'Invalid temperature. Please enter a value between '
            '$minTemperature°C and $maxTemperature°C.',
          );
        }
        break;

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

      case '4':
        String weatherMessage = '';

        if (thermostat % 3 == 0 && thermostat % 5 == 0) {
          weatherMessage = ' - Perfect Day';
        } else if (thermostat % 3 == 0) {
          weatherMessage = ' - Cool Day';
        } else if (thermostat % 5 == 0) {
          weatherMessage = ' - Warm Day';
        }

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

      case '5':
        print('Exiting the system. Goodbye!');
        isRunning = false;
        break;

      default:
        print('Invalid choice. Please select a number from 1 to 5.');
    }
  }
}