import 'dart:io';

void main() {

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

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

  while (true) {

    print("\nWelcome to the Smart Home System!");
    print("1 Toggle lights");
    print("2 Set thermostat temperature");
    print("3 Arm/Disarm security system");
    print("4 View system status");
    print("5 Exit");

    stdout.write("Enter your choice: ");
    int choice = int.parse(stdin.readLineSync()!);

    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.parse(stdin.readLineSync()!);

        if (temp >= minTemp && temp <= maxTemp) {
          thermostat = temp;
          print("Thermostat set to $thermostat °C");
        } else {
          print("Invalid temperature!");
        }
        break;

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

      case 4:

        String dayType = "";

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

        print("\nSystem Status:");
        print("Lights: ${lightsOn ? "ON" : "OFF"}");
        print("Thermostat: $thermostat °C $dayType");
        print("Security: ${(securityArmed ? "armed" : "disarmed").toUpperCase()}");

        break;

      case 5:
        print("Goodbye!");
        return;

      default:
        print("Invalid choice");
    }
  }
}