import 'dart:io';

void main() {
  // إعدادات البداية
  bool lightsOn = false;
  int thermostat = 20;
  String securitySystem = "disarmed";
  bool isRunning = true; // هذا المتغير هو اللي يخلي البرنامج يستمر

  // حلقة التكرار: بيفضل البرنامج شغال طول ما isRunning قيمتها true
  while (isRunning) {
    print("\n===== Smart Home Control System =====");
    print("1. Toggle Lights");
    print("2. Set Thermostat");
    print("3. Arm/Disarm Security System");
    print("4. View System Status");
    print("5. Exit");
    stdout.write("Enter your choice: ");

    String? choice = stdin.readLineSync()?.trim();

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

      case '2':
        stdout.write("Enter temperature (15 - 30): ");
        String? tempInput = stdin.readLineSync()?.trim();
        int? newTemp = int.tryParse(tempInput ?? "");
        if (newTemp != null && newTemp >= 15 && newTemp <= 30) {
          thermostat = newTemp;
          print(">>> Temperature set to $thermostat°C");
        } else {
          print(">>> Invalid input!");
        }
        break;

      case '3':
        securitySystem = (securitySystem == "disarmed") ? "armed" : "disarmed";
        print(">>> Security System ${securitySystem.toUpperCase()}");
        break;

      case '4':
        print("\n--- Current Status ---");
        print("Lights: ${lightsOn ? "ON" : "OFF"}");
        print("Thermostat: $thermostat°C");
        print("Security: ${securitySystem.toUpperCase()}");
        break;

      case '5':
        print("Exiting... Goodbye!");
        isRunning = false; // هنا فقط البرنامج بيقفل
        break;

      default:
        print(">>> Invalid choice, try again.");
    }
  }
}