import 'dart:io';

void main() {
  print("Welcome to the Smart Home System!");
  smartHomeSystem();
}

void smartHomeSystem() {
  bool lightsOn = false;
  int thermostat = 20;
  String securitySystem = "disarmed";

  const int minTemp = 15;
  const int maxTemp = 30;

  while (true) {
    print("\nChoose an option:");
    print("1. Toggle Lights");
    print("2. Set Temperature");
    print("3. Toggle Security System");
    print("4. Show System Status");
    print("5. Exit");

    String? choice = stdin.readLineSync();

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

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

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

      case "3":
        securitySystem = (securitySystem == "disarmed") ? "armed" : "disarmed";
        print("Security system ${securitySystem == "armed" ? "activated" : "deactivated"}.");
        break;

      case "4":
        showStatus(lightsOn, thermostat, securitySystem);
        break;

      default:
        print("Invalid option. Try again.");
    }
  }
}

void showStatus(bool lights, int temp, String security) {
  String lightStatus = lights ? "ON" : "OFF";
  String securityStatus = security.toUpperCase();

  print("\n--- System Status ---");
  print("Lights: $lightStatus");
  print("Temperature: $temp°C");

  if (temp % 3 == 0 && temp % 5 == 0) {
    print("Perfect Day");
  } else if (temp % 3 == 0) {
    print("Cool Day");
  } else if (temp % 5 == 0) {
    print("Warm Day");
  }

  print("Security System: $securityStatus");
}