Karema Ghaleb-251000800-
Question 1
// Exam 3 - Question 1
// Student Name: Karema Ghaleb
// University ID: 251000800




import 'dart:io';

void main() {
  // حالة الأجهزة
  bool lightsOn = false;
  int temperature = 20;
  bool securityArmed = false;

  // نطاق الحرارة المسموح
  const int minTemp = 15;
  const int maxTemp = 30;

  bool running = true;

  print("Welcome to Smart Home Automation System");

  while (running) {
    print("\n--- Main Menu ---");
    print("1. Control Devices");
    print("2. View System Status");
    print("3. Exit");

    String? choice = stdin.readLineSync();

    if (choice == '1') {
      print("\nSelect Device:");
      print("1. Lights");
      print("2. Thermostat");
      print("3. Security System");

      String? deviceChoice = stdin.readLineSync();

      switch (deviceChoice) {
        case '1':
          lightsOn = !lightsOn;
          print("Lights are now ${lightsOn ? 'ON' : 'OFF'}");
          break;

        case '2':
          print("Enter temperature ($minTemp - $maxTemp):");
          String? tempInput = stdin.readLineSync();
          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 a value between $minTemp and $maxTemp.");
          }
          break;

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

        default:
          print("Invalid device choice.");
      }
    } else if (choice == '2') {
      print("\n--- System Status ---");
      print("Lights: ${lightsOn ? 'ON' : 'OFF'}");
      print("Security System: ${securityArmed ? 'ARMED' : 'DISARMED'}");

      if (temperature % 3 == 0 && temperature % 5 == 0) {
        print("Thermostat: $temperature °C - Perfect Day");
      } else if (temperature % 3 == 0) {
        print("Thermostat: $temperature °C - Cool Day");
      } else if (temperature % 5 == 0) {
        print("Thermostat: $temperature °C - Warm Day");
      } else {
        print("Thermostat: $temperature °C");
      }
    } else if (choice == '3') {
      running = false;
      print("Exiting the system. Goodbye!");
    } else {
      print("Invalid option, please try again.");
    }
  }
}