import 'dart:io';

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

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

  bool running = true;

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

  while (running) {
    print("\nPlease choose an action:");
    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.tryParse(stdin.readLineSync()!);

    if (choice == null) {
      print("Invalid input. Please enter a number.");
      continue;
    }

    switch (choice) {
      case 1:
        lightsOn = !lightsOn;

        if (lightsOn) {
          print("Lights are now ON.");
        } else {
          print("Lights are now OFF.");
        }
        break;

      case 2:
        stdout.write("Set thermostat temperature ($minTemp°C - $maxTemp°C): ");
        int? temp = int.tryParse(stdin.readLineSync()!);

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

      case 3:
        securityArmed = !securityArmed;

        if (securityArmed) {
          print("Security System ARMED.");
        } else {
          print("Security System DISARMED.");
        }
        break;

      case 4:
        print("\nSystem Status:");

        String lightStatus = lightsOn ? "ON" : "OFF";
        String securityStatus = securityArmed ? "ARMED" : "DISARMED";

        String weatherMessage = "";

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

        print("- Lights: $lightStatus");

        if (weatherMessage.isNotEmpty) {
          print("- Thermostat: $thermostat°C - $weatherMessage");
        } else {
          print("- Thermostat: $thermostat°C");
        }

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

        break;

      case 5:
        print("Exiting the system. Goodbye!");
        running = false;
        break;

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