import 'dart:io'; // لإدخال القيم من المستخدم

void main() {
  // ❶ تعريف الثوابت (الحد الأدنى والأقصى للحرارة)
  const int minTemp = 15;
  const int maxTemp = 30;

  // ❷ القيم الابتدائية للأجهزة
  bool lightsOn = false;
  int temperature = 20;
  bool securityArmed = false;

  // ❸ بداية الحلقة التكرارية
  while (true) {
    print('\n=== 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();

    // تحقق من الإدخال
    if (choice == null) continue;

    switch (choice) {
      case '1':
        lightsOn = !lightsOn; // قلب الحالة
        print(lightsOn ? 'Lights are now ON' : 'Lights are now OFF');
        break;

      case '2':
        stdout.write('Enter temperature ($minTemp-$maxTemp): ');
        String? tempInput = stdin.readLineSync();
        if (tempInput != null) {
          int? newTemp = int.tryParse(tempInput);
          if (newTemp != null && newTemp >= minTemp && newTemp <= maxTemp) {
            temperature = newTemp;
            print('Temperature set to $temperature°C');
          } else {
            print(
              'Invalid temperature! Please enter between $minTemp and $maxTemp.',
            );
          }
        }
        break;

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

      case '4':
        String lightsStatus = lightsOn ? 'ON' : 'OFF';
        String securityStatus = securityArmed ? 'ARMED' : 'DISARMED';
        String tempMessage = '';

        // FizzBuzz-like logic
        if (temperature % 3 == 0 && temperature % 5 == 0) {
          tempMessage = 'Perfect Day';
        } else if (temperature % 3 == 0) {
          tempMessage = 'Cool Day';
        } else if (temperature % 5 == 0) {
          tempMessage = 'Warm Day';
        }

        print('\n--- System Status ---');
        print('Lights: $lightsStatus');
        print(
          'Temperature: $temperature°C ${tempMessage.isNotEmpty ? '($tempMessage)' : ''}',
        );
        print('Security: $securityStatus');
        break;

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

      default:
        print('Invalid choice! Please enter 1-5.');
    }
  }
}