import 'dart:io'; // استيراد المكتبة

void main() {
  // متغيرات بسيطة للحالة
  var lights = "OFF"; 
  var temperature = 20; 
  var security = "DISARMED"; 

  print("Welcome to the Smart Home System!");

  while (true) {
    print("\n1. Toggle lights");
    print("2. Set temperature");
    print("3. Security system");
    print("4. Status");
    print("5. Exit");
    stdout.write("Choice: ");
    
    String? input = stdin.readLineSync();

    if (input == "1") {
      if (lights == "OFF") {
        lights = "ON";
      } else {
        lights = "OFF";
      }
      print("Lights updated!");
    } 
    else if (input == "2") {
      print("Enter temp (15-30): ");
      int? newTemp = int.parse(stdin.readLineSync()!);
      
      if (newTemp >= 15 && newTemp <= 30) {
        temperature = newTemp;
      } else {
        print("Wrong temperature!");
      }
    } 
    else if (input == "3") {
      if (security == "DISARMED") {
        security = "ARMED";
      } else {
        security = "DISARMED";
      }
      print("Security updated!");
    } 
    else if (input == "4") {
      // منطق الكلمات الخاصة بالحرارة
      String note = "";
      if (temperature % 3 == 0 && temperature % 5 == 0) { note = "Perfect Day"; }
      else if (temperature % 3 == 0) { note = "Cool Day"; }
      else if (temperature % 5 == 0) { note = "Warm Day"; }

      print("--- System Status ---");
      print("Lights: $lights");
      print("Temperature: $temperature $note");
      print("Security: $security");
    } 
    else if (input == "5") {
      print("Goodbye!");
      break; 
    }
  }
}