import 'dart:io';

void main() {
  // 1. الثوابت (Constants) [cite: 38, 39]
  const double minTemp = 15.0;
  const double maxTemp = 30.0;

  // 2. تهيئة القيم الافتراضية (Initialization) [cite: 13, 17]
  bool isLightsOn = false;
  double temperature = 20.0;
  String securityStatus = "disarmed";

  print("Welcome to the Smart Home System! [cite: 42]");

  // 3. حلقة التكرار للتفاعل المستمر (Loop) [cite: 19]
  bool running = true;
  while (running) {
    print("\nPlease choose an action: [cite: 43]");
    print("1. Toggle lights [cite: 44]");
    print("2. Set thermostat temperature [cite: 45]");
    print("3. Arm/disarm security system [cite: 46]");
    print("4. View system status [cite: 47]");
    print("5. Exit [cite: 48]");
    stdout.write("Enter your choice: ");

    String? choice = stdin.readLineSync();

    // 4. استخدام switch للتعامل مع أوامر الأجهزة [cite: 30]
    switch (choice) {
      case '1':
        isLightsOn = !isLightsOn; // تبديل الحالة [cite: 21]
        print("Lights are now ${isLightsOn ? 'ON' : 'OFF'}. [cite: 50]");
        break;

      case '2':
        stdout.write("Set thermostat temperature ($minTemp°C - $maxTemp°C): ");
        double? inputTemp = double.tryParse(stdin.readLineSync() ?? "");

        // التحقق من المدخلات باستخدام المعاملات المنطقية [cite: 27, 41]
        if (inputTemp != null && inputTemp >= minTemp && inputTemp <= maxTemp) {
          temperature = inputTemp;
          print("Thermostat set to $temperature°C. [cite: 53]");
        } else {
          print("Invalid temperature! Please enter a value between $minTemp and $maxTemp. [cite: 27]");
        }
        break;

      case '3':
        // تبديل حالة نظام الأمان [cite: 23, 41]
        if (securityStatus == "disarmed") {
          securityStatus = "armed";
        } else {
          securityStatus = "disarmed";
        }
        print("Security System is now ${securityStatus.toUpperCase()}. ");
        break;

      case '4':
        // 5. عرض حالة النظام مع تمارين إضافية (String Interpolation) [cite: 34]
        print("\n--- System Status --- [cite: 55]");
        print("Lights: ${isLightsOn ? 'ON' : 'OFF'} [cite: 56]");
        
        // تمرين FizzBuzz لدرجة الحرارة 
        String tempMessage = "";
        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("Thermostat: $temperature°C $tempMessage [cite: 57]");
        
        // تحويل النص للأحرف الكبيرة (String Operation) 
        print("Security System: ${securityStatus.toUpperCase()} [cite: 58]");
        break;

      case '5':
        running = false;
        print("Exiting the system. Goodbye! [cite: 60]");
        break;

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