// Smart Home Automation CLI - Question 1
// Author: Rania Mohammad Abdulkarim
// ID: 251000739
// Simple, readable Dart console app implementing the specified features.

import 'dart:io';

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

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

  print('Welcome to Smart Home CLI.');
  while (true) {
    print('\nChoose an option:');
    print('1) Toggle lights');
    print('2) Set thermostat');
    print('3) Arm/Disarm security system');
    print('4) View system status');
    print('5) Exit');
    stdout.write('Enter choice (1-5): ');
    String? input = stdin.readLineSync();
    if (input == null) continue;

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

    if (choice == 5) {
      print('Exiting Smart Home CLI. Goodbye!');
      break;
    } else if (choice >= 1 && choice <= 4) {
      switch (choice) {
        case 1:
          lightsOn = !lightsOn;
          print('Lights turned ${lightsOn ? 'ON' : 'OFF'}.');
          break;
        case 2:
          while (true) {
            stdout.write('Enter thermostat temperature ($MIN_TEMP-$MAX_TEMP): ');
            String? t = stdin.readLineSync();
            int? temp = int.tryParse(t ?? '');
            if (temp == null) {
              print('Please enter a valid integer.');
              continue;
            }
            if (temp < MIN_TEMP || temp > MAX_TEMP) {
              print('Temperature out of range. Try again.');
              continue;
            } else {
              thermostat = temp;
              print('Thermostat set to ${thermostat}°C.');
              break;
            }
          }
          break;
        case 3:
          securityArmed = !securityArmed;
          print('Security system is now ${securityArmed ? 'ARMED' : 'disarmed'}.');
          break;
        case 4:
          String lightsStatus = lightsOn ? 'ON' : 'OFF';
          String securityStatus = securityArmed ? 'ARMED' : 'disarmed';
          securityStatus = securityStatus.toUpperCase();

          print('\n--- System Status ---');
          print('Lights: $lightsStatus');
          print('Thermostat: ${thermostat}°C');
          print('Security System: $securityStatus');

          bool mult3 = (thermostat % 3 == 0);
          bool mult5 = (thermostat % 5 == 0);
          if (mult3 && mult5) {
            print('Perfect Day (${thermostat}°C)');
          } else if (mult3) {
            print('Cool Day (${thermostat}°C)');
          } else if (mult5) {
            print('Warm Day (${thermostat}°C)');
          }
          print('---------------------\n');
          break;
      }
    } else {
      print('Choice out of range. Please pick 1-5.');
    }
  }
}