import 'dart:io';

const int MIN_TEMP = 15;
const int MAX_TEMP = 30;

void main() {
  // القيم الافتراضية
  bool lightsOn = false; // false => OFF, true => ON
  int thermostat = 20; // الافتراضي 20°C
  bool securityArmed = false; // false => DISARMED

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

  bool running = true;
  while (running) {
    showMenu();
    stdout.write('\nEnter your choice: ');
    String? input = stdin.readLineSync();
    int? choice = input != null ? int.tryParse(input.trim()) : null;

    if (choice == null) {
      print('Invalid input. Please enter a number from 1 to 5.\n');
      continue;
    }

    switch (choice) {
      case 1:
        // Toggle lights
        lightsOn = !lightsOn;
        print('Lights are now ${lightsOn ? "ON" : "OFF"}.\n');
        break;

      case 2:
        // Set thermostat
        setThermostat((int newTemp) {
          thermostat = newTemp;
          print('Thermostat set to ${thermostat}°C.\n');
        }, thermostat);
        break;

      case 3:
        // Arm/disarm security
        securityArmed = !securityArmed;
        print('Security System is now ${securityArmed ? "ARMED" : "DISARMED"}.\n');
        break;

      case 4:
        // View system status
        print('\nSystem Status:');
        print('- Lights: ${lightsOn ? "ON" : "OFF"}');
        print('- Thermostat: ${thermostat}°C ${fizzBuzzTemp(thermostat)}');
        print('- Security System: ${securityArmed ? "ARMED" : "DISARMED"}\n');
        break;

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

      default:
        print('Choice out of range. Please choose between 1 and 5.\n');
    }
  }
}

void showMenu() {
  print('''
Please choose an action:
1. Toggle lights
2. Set thermostat temperature
3. Arm/disarm security system
4. View system status
5. Exit
''');
}

/// setThermostat: تطلب من المستخدم إدخال درجة حرارة صحيحة ضمن النطاق.
/// callback: دالة تُطبّق لتحديث المتغير في المكان الذي استُدعي منه.
void setThermostat(void Function(int) callback, int currentTemp) {
  while (true) {
    stdout.write('Set thermostat temperature (${MIN_TEMP}°C - ${MAX_TEMP}°C). Current: ${currentTemp}°C: ');
    String? line = stdin.readLineSync();
    if (line == null) {
      print('No input detected. Try again.');
      continue;
    }
    int? temp = int.tryParse(line.trim());
    if (temp == null) {
      print('Invalid number. Please enter an integer value.');
      continue;
    }
    if (temp < MIN_TEMP || temp > MAX_TEMP) {
      print('Temperature out of range. Please enter between ${MIN_TEMP} and ${MAX_TEMP}.');
      continue;
    }
    // قيمة صحيحة داخل النطاق
    callback(temp);
    break;
  }
}

/// fizzBuzzTemp: طبق متطلب FizzBuzz-like على درجة الحرارة
/// - multiple of 3 => " - Cool Day"
/// - multiple of 5 => " - Warm Day"
/// - multiple of both => " - Perfect Day"
/// وإلا => (سلسلة فارغة)
String fizzBuzzTemp(int temp) {
  bool by3 = temp % 3 == 0;
  bool by5 = temp % 5 == 0;

  if (by3 && by5) return '- Perfect Day';
  if (by3) return '- Cool Day';
  if (by5) return '- Warm Day';
  return '';
}