import 'dart:io';

void main() {
  const int minTemp = 15;
  const int maxTemp = 30;

  bool lightsOn =false;
  int temperature = 20;
  bool securityArmed = false;


  while (true) {
    print('1. Toggle Lights');
    print('2. set Thermostat');
    print('3. Arm/Disarm Security');
    print('4. View System Status');
    print('5. Exit');
    stdout.write('Enter your Choice: ');
    String? choice = stdin.readLineSync();

    if (choice == '5'){
      print('Exiting Smart Home System....');
      break;
    }

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

      case '2':
      stdout.write('Enter temperature ($minTemp-$maxTemp):');
      String? input = stdin.readLineSync();
      int? newTemp = int.tryParse(input ?? '');
      if (newTemp != null && newTemp >= minTemp && newTemp <= maxTemp){
        temperature = newTemp;

        print('Temperature set to $temperature°C.');
      } else {
        print('Invalid temperature! Please enter between $mainTemp and $maxTemp.')
      }

      break;

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

      case '4':
      print('\n--- System Status ---');
      print('Lights: ${lightsOn ? 'ON' : 'OFF'}');
      print('Thermostat: $temperature°C');
      print('Security: ${securityArmed ? 'ARMED' : 'DISARMED'}');

      if (temperature % 3 == 0 && temperature % 5 == 0){
        print('Perfect Day');
      }else if (temperature % 3 == 0){
        print('Cool Day');
      }else if (temperature % 5 == 0){
        print('Warm Day');
      }
      break;

      default:
      print('Invalid choice, please try again.');
    }
  }

}