// Noor Bandar ALabsi_242000818_question1.
// Smart Home Automation System
//  – Question 1

import 'dart:io';

void main() {
  const int minTemp = 15;
  const int maxTemp = 30;

  bool lightsOn = false;
  int thermostat = 20;
  bool securityArmed = false;

  print('==============================');
  print('Welcome to Smart Home System');
  print('==============================');

  bool running = true;

  while (running) {
    print('');
    print('Please choose an option:');
    print('1. Turn lights ON/OFF');
    print('2. Set thermostat temperature');
    print('3. Arm/Disarm security system');
    print('4. View system status');
    print('5. Exit');

    stdout.write('Enter your choice (1-5): ');
    String? input = stdin.readLineSync();
    if (input == null) continue;
    input = input.trim();

    int? choice = int.tryParse(input);
    if (choice == null || choice < 1 || choice > 5) {
      print('Invalid choice! Please enter a number between 1 and 5.');
      continue;
    }

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

      case 2:
        stdout.write('Enter new temperature ($minTemp-$maxTemp): ');
        String? tempInput = stdin.readLineSync();
        int? newTemp = int.tryParse(tempInput ?? '');
        if (newTemp == null || newTemp < minTemp || newTemp > maxTemp) {
          print('Invalid temperature! Please enter between $minTemp and $maxTemp.');
        } else {
          thermostat = newTemp;
          print('Thermostat set to $thermostat°C.');
        }
        break;

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

      case 4:
        print('');
        print('========= SYSTEM STATUS =========');
        print('Lights: ${lightsOn ? "ON" : "OFF"}');
        print('Thermostat: $thermostat°C');
        print('Security System: ${securityArmed ? "ARMED" : "DISARMED"}');

        if (thermostat % 3 == 0 && thermostat % 5 == 0) {
          print('Perfect Day - $thermostat°C');
        } else if (thermostat % 3 == 0) {
          print('Cool Day - $thermostat°C');
        } else if (thermostat % 5 == 0) {
          print('Warm Day - $thermostat°C');
        }
        print('=================================');
        break;

      case 5:
        running = false;
        print('\nExiting Smart Home System...');
        print('Goodbye!');
        break;
    }
  }
}