import 'dart:io';

void main() {
  print("Welcome to The Smart Home System !");

  bool lightsOn = false;

  const minThermostat = 15;
  const maxThermostat = 30;

  int temperature = 20;

  bool securityArmed = false;

  while (true) {
    print("Please choose an action:");
    print("1. Toggle lights");
    print("2. Set thrmostat temperature");
    print("3. Arm/disarm security system");
    print("4. View system status ");
    print("Exit");

    String? choice = stdin.readLineSync();

    if (choice == "1") {
      // Toggle lights

      switch (lightsOn) {
        case true:
          lightsOn = false;
          print("Lights turned OFF ");
          break;
        case false:
          lightsOn = true;
          print(" Lights turned On");
          break;
      }
    } else if (choice == "2") {
      // Set thrmostat temperature
      print("Enter Temperature ($minThermostat - $maxThermostat) :");
      String? tempInput = stdin.readLineSync();
      int? newtemp = int.tryParse(tempInput ?? "");
      if (newtemp == null) {
        print("Invalid number");
      } else if (newtemp < minThermostat || newtemp > maxThermostat) {
        print("Temperature out of rang !");
      } else {
        temperature = newtemp;
        print("Temperature set to $temperature  C");
      }
    } else if (choice == "3") {
      // Arm/disarm security system
      switch (securityArmed) {
        case true:
          securityArmed = false;
          print("Security system Disarmed .");
          break;
        case false:
          securityArmed = true;
          print("Security system Armed");
          break;
      }
    } else if (choice == "4") {
      //View system status
      String lightsSatatus = lightsOn ? "ON" : "OFF";
      String securityStatus = securityArmed ? "ARMED" : "DISARMED";

      print("  System Status:");
      print("Lights: $lightsSatatus");
      print("Thermostat : $temperature");
      print("Security System: ${securityStatus.toUpperCase()}");

      // Fizz- like Logic
      if (temperature % 3 == 0 && temperature % 5 == 0) {
        print("Perfect Day.");
      } else if (temperature % 3 == 0) {
        print("Cool Day");
      } else if (temperature % 5 == 0) {
        print("Warm Day.");
      }
    } else if (choice == "5") {
      print("Exiting system Goodbye !");
      break;
    } else {
      print("Invalid choice. Please try again .");
    }
  }
}