// smart_home.dart
import 'dart:io';

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

void main() {
  bool lightsOn = false;
  int thermostat = 20;
  bool securityArmed = false;
  bool running = true;

  while (running) {
    print('\nWelcome to the Smart Home System!');
    print('Please 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('\nEnter your choice: ');
    String? choice = stdin.readLineSync();

    if (choice == null) continue;

    switch (choice) {
      case '1':
        // toggle lights
        lightsOn = !lightsOn;
        print('Lights are now ${lightsOn ? "ON" : "OFF"}.');
        break;
      case '2':
        // set thermostat
        while (true) {
          stdout.write('Set thermostat temperature ($minTemp°C - $maxTemp°C): ');
          String? input = stdin.readLineSync();
          if (input == null) continue;
          int? t = int.tryParse(input);
          if (t == null || t < minTemp || t > maxTemp) {
            print('Invalid temperature. Please enter between $minTemp and $maxTemp.');
            continue;
          }
          thermostat = t;
          print('Thermostat set to ${thermostat}°C.');
          break;
        }
        break;
      case '3':
        // arm/disarm security
        stdout.write('Enter "arm" to ARM or "disarm" to DISARM: ');
        String? cmd = stdin.readLineSync();
        if (cmd != null) {
          if (cmd.toLowerCase() == 'arm') {
            securityArmed = true;
            print('Security system is now ARMED.');
          } else if (cmd.toLowerCase() == 'disarm') {
            securityArmed = false;
            print('Security system is now DISARMED.');
          } else {
            print('Invalid command. Use "arm" or "disarm".');
          }
        }
        break;
      case '4':
        // view status
        String lightsStatus = lightsOn ? 'ON' : 'OFF';
        String securityStatus = securityArmed ? 'ARMED' : 'DISARMED';
        // FizzBuzz-like for temperature
        String dayRemark = '';
        bool mult3 = (thermostat % 3 == 0);
        bool mult5 = (thermostat % 5 == 0);
        if (mult3 && mult5) dayRemark = ' — Perfect Day';
        else if (mult3) dayRemark = ' — Cool Day';
        else if (mult5) dayRemark = ' — Warm Day';

        print('\nSystem Status:');
        print('- Lights: ${lightsStatus.toUpperCase()}');
        print('- Thermostat: ${thermostat}°C${dayRemark}');
        print('- Security System: ${securityStatus.toUpperCase()}');
        break;
      case '5':
        print('Exiting the system. Goodbye!');
        running = false;
        break;
      default:
        print('Invalid choice. Please choose 1-5.');
    }
  }
}