// Smart Home Automation CLI (Dart)
// Filename suggestion: AsmaKhaledAlamoudi_252001042_question1.txt

import 'dart:io';

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

void main() {
  bool lightsOn = false; // default: lightsOff
  int thermostat = 20; // default: 20°C
  bool securityArmed = false; // default: disarmed

  print('Welcome to Smart Home CLI!');
  while (true) {
    print('\nChoose an option:');
    print('1. Control Lights');
    print('2. Set Thermostat');
    print('3. Control Security System');
    print('4. View System Status');
    print('5. Exit');

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

    if (input == '5') {
      print('Exiting... Goodbye!');
      break;
    }

    // Use if/else to handle top-level choices
    if (input == '1' || input == '2' || input == '3' || input == '4') {
      switch (input) {
        case '1':
          // Lights commands
          print('\nLights:');
          print('a. Turn ON');
          print('b. Turn OFF');
          stdout.write('Choose (a/b): ');
          String? c = stdin.readLineSync();
          if (c != null && c.toLowerCase() == 'a') {
            lightsOn = true;
            print('Lights turned ON.');
          } else if (c != null && c.toLowerCase() == 'b') {
            lightsOn = false;
            print('Lights turned OFF.');
          } else {
            print('Invalid lights command.');
          }
          break;

        case '2':
          // Thermostat commands
          stdout.write('\nEnter desired temperature (${MIN_TEMP}-${MAX_TEMP} °C): ');
          String? tempStr = stdin.readLineSync();
          if (tempStr == null) {
            print('No input.');
            break;
          }
          int? temp = int.tryParse(tempStr);
          if (temp == null) {
            print('Please enter a valid integer temperature.');
            break;
          }
          // Validate using logical & relational operators
          if (temp < MIN_TEMP || temp > MAX_TEMP) {
            print('Temperature must be between $MIN_TEMP and $MAX_TEMP.');
          } else {
            thermostat = temp;
            print('Thermostat set to $thermostat°C.');
          }
          break;

        case '3':
          // Security system
          print('\nSecurity System:');
          print('a. Arm');
          print('b. Disarm');
          stdout.write('Choose (a/b): ');
          String? s = stdin.readLineSync();
          if (s != null && s.toLowerCase() == 'a') {
            securityArmed = true;
            print('Security system ARMED.');
          } else if (s != null && s.toLowerCase() == 'b') {
            securityArmed = false;
            print('Security system DISARMED.');
          } else {
            print('Invalid security command.');
          }
          break;

        case '4':
          // View system status with string interpolation and operations
          String lightsStatus = lightsOn ? 'ON' : 'OFF';
          String securityStatus = securityArmed ? 'ARMED' : 'DISARMED';
          // FizzBuzz-like exercise for thermostat
          String tempNote = '';
          bool mult3 = (thermostat % 3 == 0);
          bool mult5 = (thermostat % 5 == 0);
          if (mult3 && mult5) {
            tempNote = ' - Perfect Day';
          } else if (mult3) {
            tempNote = ' - Cool Day';
          } else if (mult5) {
            tempNote = ' - Warm Day';
          }
          print('\n--- System Status ---');
          // Use string interpolation
          print('Lights: $lightsStatus');
          print('Thermostat: ${thermostat}°C$tempNote');
          // Show security status in uppercase (string operation)
          print('Security: ${securityStatus.toUpperCase()}');
          print('---------------------');
          break;
      }
    } else {
      print('Please enter a valid choice between 1 and 5.');
    }
  }
}