// Author: Albatool
// University ID: 251002039
// Question 1 - Smart Home Automation System

import 'dart:io';

void main() {
  bool lightsOn = false;
  int temperature = 20;
  bool securityArmed = false;

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

  while (true) {
    print('\n=== Smart Home Automation System ===');
    print('1. Toggle Lights');
    print('2. Set Temperature');
    print('3. Toggle Security System');
    print('4. Show Status');
    print('5. Exit');
    stdout.write('Choose an option: ');

    String? choice = stdin.readLineSync();

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

      case '2':
        stdout.write('Enter temperature ($minTemp-$maxTemp): ');
        String? input = stdin.readLineSync();
        if (input != null) {
          int? temp = int.tryParse(input);
          if (temp != null && temp >= minTemp && temp <= maxTemp) {
            temperature = temp;
            print('Temperature set to $temperature°C');
          } else {
            print('Invalid temperature! Must be between $minTemp and $maxTemp.');
          }
        }
        break;

      case '3':
        securityArmed = !securityArmed;
        print('Security System is now: ${securityArmed ? "ARMED" : "DISARMED"}');
        break;

      case '4':
        print('\n--- System Status ---');
        print('Lights: ${lightsOn ? "ON" : "OFF"}');
        print('Temperature: $temperature°C');
        print('Security: ${securityArmed ? "ARMED" : "DISARMED"}');

        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');
        }
        break;

      case '5':
        print('Goodbye 👋');
        return;

      default:
        print('Invalid choice ❌');
    }
  }
}