main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      home: Scaffold(
        body: Center(child: Calculator()),
      ),
    ),
  );
}

class Calculator extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => _CalculatorState();
}

class _CalculatorState extends State<Calculator> {
  int code = 0;

  @override
  Widget build(BuildContext context) => Padding(
        padding: const EdgeInsets.all(30.0),
        child: ListView(
          children: [
            const Text('Input numeric code below:'),
            TextField(
                autofocus: true,
                decoration: const InputDecoration(
                    enabledBorder: UnderlineInputBorder(
                        borderSide: BorderSide(color: Colors.black))),
                onChanged: (value) => setState(() {
                      code = int.tryParse(value) ?? 0;
                    })),
            Text(convertToReasons(code).toList().join(' '))
          ],
        ),
      );
}

const None = 0;
const AutomationVisible = 0x1;
const UnexpectedEnvironmentVisible = 0x2;
const TooMuchTrafficVisible = 0x4;
const UnexpectedUsagePatternsVisible = 0x8;
const LowConfidenceScoreVisible = 0x10;
const OtherReasonVisible = 0x20;
const AutomationHidden = 0x40;
const UnexpectedEnvironmentHidden = 0x80;
const TooMuchTrafficHidden = 0x100;
const UnexpectedUsagePatternsHidden = 0x200;
const LowConfidenceScoreHidden = 0x400;
const OtherReasonHidden = 0x800;

Iterable<String> convertToReasons(int reason) sync* {
  if (reason & AutomationVisible == AutomationVisible) {
    yield 'AutomationVisible';
  }
  if (reason & UnexpectedEnvironmentVisible == UnexpectedEnvironmentVisible) {
    yield 'UnexpectedEnvironmentVisible';
  }
  if (reason & TooMuchTrafficVisible == TooMuchTrafficVisible) {
    yield 'TooMuchTrafficVisible';
  }
  if (reason & UnexpectedUsagePatternsVisible ==
      UnexpectedUsagePatternsVisible) {
    yield 'UnexpectedUsagePatternsVisible';
  }
  if (reason & LowConfidenceScoreVisible == LowConfidenceScoreVisible) {
    yield 'LowConfidenceScoreVisible';
  }
  if (reason & OtherReasonVisible == OtherReasonVisible) {
    yield 'OtherReasonVisible';
  }
  if (reason & AutomationHidden == AutomationHidden) {
    yield 'AutomationHidden';
  }
  if (reason & UnexpectedEnvironmentHidden == UnexpectedEnvironmentHidden) {
    yield 'UnexpectedEnvironmentHidden';
  }
  if (reason & LowConfidenceScoreHidden == LowConfidenceScoreHidden) {
    yield 'LowConfidenceScoreHidden';
  }
  if (reason & OtherReasonHidden == OtherReasonHidden) {
    yield 'OtherReasonHidden';
  }
  if (reason & TooMuchTrafficHidden == TooMuchTrafficHidden) {
    yield 'TooMuchTrafficHidden';
  }
}