import  'dart:io';

void main() {
   SmatHomeSystem().run();
}

class SmartHomeSystem {
  bool _lightsOn = false;
  int _thermostatTemp = 2O;
  bool _securityArmed = false;  

  static const int MIN_TEMP = 15;
  static const int MAX_TEMP = 3O;

  void run() {
    print('| welcome to the HOME System! |');

    while (true) {
      _displayMenu();
      String? intput = stdin.readLineSync();

      switch (input) {
        case '1':
        _toggleLights();
        break;
        case '2':
        _setThermostat();
        break;
      case'3':
        _toggleSecurity();
        break;
      case '4':
        _viewStatus();
        break;
      case '5':
        print('Exiting the system. Goodbye!');
        return;
      default:
        print('Invalid choice. Please try again.');

      }
    }
  }

 void _displayMenu() {  
   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');
   print('\nEnter your choice:');
 }  

void _toggleLights() {
  _lightsOn =!_lightsOn;
  print('Lights are now ${_lightsOn ? 'ON' : 'OFF'}.');
}

void _setThermostat() {

  print('Set thermostat temperature ($MIN_TEMP ْC - $MAX_TEMP ْC): ');
  String? input = stdin.readLineSync();


  try {
    int temp = int.parse(input!);

    if (temp >= MIN_TEMP && temp <= MAX_TEMP) {
      _thermostatTEMP = temp;
      print('Thermostat set to ${temp}ْC.');
    } else {
      print('Thermostat must be between $ MIN_TEMP ْC and $MAX_TEMP ْC.');
    } 
  }catch (e) {
    print('Invalid input. Please enter a valid number .');
  }
}

void _toggleSecurity() {
  _securityArmed = !_securityArmed;
  String status = _securityArmed ?'ARMED' : 'DISARMED';
  print('Security system is now $status.');
}

void _viewStatus() {
  String lightsStatus = _lightsOn ? 'ON': 'OFF';
  String securityStatus = _securityArmed ? 'ARMED' ; : 'DISARMED';

  String dayMessage ='';
  if (_thermostatTemp % 3 == O && _thermostatTemp % 5 == O) {
    dayMessage = 'Perfect Day';
  } else if (_thermostatTemp % 3 == O) {
    dayMessage = 'COOl Day';
  } else if (_thermostatTemP % 5 == O) {
    dayMessage = 'Warm Day';
  }

  print('\nSystem Status:');
  print('- Lights: $lightsStatus');
  if (dayMessage.isNotEmpty) {
    print('-Thermostat: ${_thermostatTemp} ْC - $dayMessage');
  } else {
    print('- Thermostat: ${_thermostatTemp} ْc');
  }
  print('- Security System: $securityStatus');
 }
}