import 'dart:io';

void main() {
  const int minTemp = 15;
  const int maxTemp = 30;

  bool lightsOn = false;
  int temperature = 20;
  bool securityArmed = false;

  while (true) {
    print("\n🏠 Smart Home Control 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("Choose an option: ");
    String? choice = stdin.readLineSync();

    if (choice == "5") {
      print("Exiting system... Goodbye!");
      break;
    }

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

      case "2":
        stdout.write("Enter temperature ($minTemp - $maxTemp): ");
        int? temp = int.tryParse(stdin.readLineSync()!);
        if (temp != null && temp >= minTemp && temp <= maxTemp) {
          temperature = temp;
          print("Temperature set to $temperature°C");
        } else {
          print("❌ Invalid temperature. Try again.");
        }
        break;

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

      case "4":
        String dayType = "";
        if (temperature % 3 == 0 && temperature % 5 == 0) {
          dayType = "Perfect Day";
        } else if (temperature % 3 == 0) {
          dayType = "Cool Day";
        } else if (temperature % 5 == 0) {
          dayType = "Warm Day";
        }

        print("\n🏡 System Status:");
        print("Lights: ${lightsOn ? "ON" : "OFF"}");
        print("Thermostat: $temperature°C ${dayType.isNotEmpty ? "($dayType)" : ""}");
        print("Security System: ${securityArmed ? "ARMED" : "DISARMED"}");
        break;

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