import 'dart:io';

void main() {
  bool lights = false;
  bool security = false;
  int temp = 20;
  bool run = true;

  print("Welcome to smart home system!");

  while (run) {
    print("\n1. Toggle Lights");
    print("2. Set thermostat Temperature");
    print("3. Arm/Disarm Security system");
    print("4. view system Status");
    print("5. Exit");
    stdout.write("Choose option: ");
    var c = stdin.readLineSync();

    if (c == "1") {
      if (lights) {
        lights = false;
        print("Lights are now turned off");
      } else {
        lights = true;
        print("Lights are now turned on");
      }
    } else if (c == "2") {
      print("Set thermostat temperature (15-30): ");

      var t = stdin.readLineSync();
      var tt = int.tryParse(t ?? "0");
      if (tt == null) {
        print("not a number");
      } else if (tt < 15 || tt > 30) {
        print("Only 15-30 allowed!");
      } else {
        temp = tt;
        print("Temperature set to $temp");
      }
    } else if (c == "3") {
      if (security) {
        security = false;
        print("Disarmed");
      } else {
        security = true;
        print("Armed");
      }
    } else if (c == "4") {
      print("\n--- STATUS ---");
      print("Lights: ${lights ? "ON" : "OFF"}");
      print("Temp: $temp C");
      print("Security: ${security ? "ARMED" : "OFF"}");

      // little FizzBuzz check
      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");
      }
    } else if (c == "5") {
      print("Exitin the system, goodbye!!");
      run = false;
    } else {
      print("Wrong choice!!");
    }
  }
}

// اسف على اللخبطة بحاول اتحسن(: