<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Console\Helper;

use Symfony\Component\Console\Cursor;
use Symfony\Component\Console\Exception\MissingInputException;
use Symfony\Component\Console\Exception\RuntimeException;
use Symfony\Component\Console\Formatter\OutputFormatter;
use Symfony\Component\Console\Formatter\OutputFormatterStyle;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\StreamableInputInterface;
use Symfony\Component\Console\Output\ConsoleOutputInterface;
use Symfony\Component\Console\Output\ConsoleSectionOutput;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Question\ChoiceQuestion;
use Symfony\Component\Console\Question\Question;
use Symfony\Component\Console\Terminal;

use function Symfony\Component\String\s;

/**
 * The QuestionHelper class provides helpers to interact with the user.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class QuestionHelper extends Helper
{
    /**
     * @var resource|null
     */
    private $inputStream;

    private static bool $stty = true;
    private static bool $stdinIsInteractive;

    /**
     * Asks a question to the user.
     *
     * @return mixed The user answer
     *
     * @throws RuntimeException If there is no data to read in the input stream
     */
    public function ask(InputInterface $input, OutputInterface $output, Question $question): mixed
    {
        if ($output instanceof ConsoleOutputInterface) {
            $output = $output->getErrorOutput();
        }

        if (!$input->isInteractive()) {
            return $this->getDefaultAnswer($question);
        }

        if ($input instanceof StreamableInputInterface && $stream = $input->getStream()) {
            $this->inputStream = $stream;
        }

        try {
            if (!$question->getValidator()) {
                return $this->doAsk($output, $question);
            }

            $interviewer = function () use ($output, $question) {
                return $this->doAsk($output, $question);
            };

            return $this->validateAttempts($interviewer, $output, $question);
        } catch (MissingInputException $exception) {
            $input->setInteractive(false);

            if (null === $fallbackOutput = $this->getDefaultAnswer($question)) {
                throw $exception;
            }

            return $fallbackOutput;
        }
    }

    /**
     * {@inheritdoc}
     */
    public function getName(): string
    {
        return 'question';
    }

    /**
     * Prevents usage of stty.
     */
    public static function disableStty()
    {
        self::$stty = false;
    }

    /**
     * Asks the question to the user.
     *
     * @throws RuntimeException In case the fallback is deactivated and the response cannot be hidden
     */
    private function doAsk(OutputInterface $output, Question $question): mixed
    {
        $this->writePrompt($output, $question);

        $inputStream = $this->inputStream ?: \STDIN;
        $autocomplete = $question->getAutocompleterCallback();

        if (null === $autocomplete || !self::$stty || !Terminal::hasSttyAvailable()) {
            $ret = false;
            if ($question->isHidden()) {
                try {
                    $hiddenResponse = $this->getHiddenResponse($output, $inputStream, $question->isTrimmable());
                    $ret = $question->isTrimmable() ? trim($hiddenResponse) : $hiddenResponse;
                } catch (RuntimeException $e) {
                    if (!$question->isHiddenFallback()) {
                        throw $e;
                    }
                }
            }

            if (false === $ret) {
                $ret = $this->readInput($inputStream, $question);
                if (false === $ret) {
                    throw new MissingInputException('Aborted.');
                }
                if ($question->isTrimmable()) {
                    $ret = trim($ret);
                }
            }
        } else {
            $autocomplete = $this->autocomplete($output, $question, $inputStream, $autocomplete);
            $ret = $question->isTrimmable() ? trim($autocomplete) : $autocomplete;
        }

        if ($output instanceof ConsoleSectionOutput) {
            $output->addContent($ret);
        }

        $ret = \strlen($ret) > 0 ? $ret : $question->getDefault();

        if ($normalizer = $question->getNormalizer()) {
            return $normalizer($ret);
        }

        return $ret;
    }

    private function getDefaultAnswer(Question $question): mixed
    {
        $default = $question->getDefault();

        if (null === $default) {
            return $default;
        }

        if ($validator = $question->getValidator()) {
            return \call_user_func($question->getValidator(), $default);
        } elseif ($question instanceof ChoiceQuestion) {
            $choices = $question->getChoices();

            if (!$question->isMultiselect()) {
                return $choices[$default] ?? $default;
            }

            $default = explode(',', $default);
            foreach ($default as $k => $v) {
                $v = $question->isTrimmable() ? trim($v) : $v;
                $default[$k] = $choices[$v] ?? $v;
            }
        }

        return $default;
    }

    /**
     * Outputs the question prompt.
     */
    protected function writePrompt(OutputInterface $output, Question $question)
    {
        $message = $question->getQuestion();

        if ($question instanceof ChoiceQuestion) {
            $output->writeln(array_merge([
                $question->getQuestion(),
            ], $this->formatChoiceQuestionChoices($question, 'info')));

            $message = $question->getPrompt();
        }

        $output->write($message);
    }

    /**
     * @return string[]
     */
    protected function formatChoiceQuestionChoices(ChoiceQuestion $question, string $tag): array
    {
        $messages = [];

        $maxWidth = max(array_map([__CLASS__, 'width'], array_keys($choices = $question->getChoices())));

        foreach ($choices as $key => $value) {
            $padding = str_repeat(' ', $maxWidth - self::width($key));

            $messages[] = sprintf("  [<$tag>%s$padding</$tag>] %s", $key, $value);
        }

        return $messages;
    }

    /**
     * Outputs an error message.
     */
    protected function writeError(OutputInterface $output, \Exception $error)
    {
        if (null !== $this->getHelperSet() && $this->getHelperSet()->has('formatter')) {
            $message = $this->getHelperSet()->get('formatter')->formatBlock($error->getMessage(), 'error');
        } else {
            $message = '<error>'.$error->getMessage().'</error>';
        }

        $output->writeln($message);
    }

    /**
     * Autocompletes a question.
     *
     * @param resource $inputStream
     */
    private function autocomplete(OutputInterface $output, Question $question, $inputStream, callable $autocomplete): string
    {
        $cursor = new Cursor($output, $inputStream);

        $fullChoice = '';
        $ret = '';

        $i = 0;
        $ofs = -1;
        $matches = $autocomplete($ret);
        $numMatches = \count($matches);

        $sttyMode = shell_exec('stty -g');
        $isStdin = 'php://stdin' === (stream_get_meta_data($inputStream)['uri'] ?? null);
        $r = [$inputStream];
        $w = [];

        // Disable icanon (so we can fread each keypress) and echo (we'll do echoing here instead)
        shell_exec('stty -icanon -echo');

        // Add highlighted text style
        $output->getFormatter()->setStyle('hl', new OutputFormatterStyle('black', 'white'));

        // Read a keypress
        while (!feof($inputStream)) {
            while ($isStdin && 0 === @stream_select($r, $w, $w, 0, 100)) {
                // Give signal handlers a chance to run
                $r = [$inputStream];
            }
            $c = fread($inputStream, 1);

            // as opposed to fgets(), fread() returns an empty string when the stream content is empty, not false.
            if (false === $c || ('' === $ret && '' === $c && null === $question->getDefault())) {
                shell_exec('stty '.$sttyMode);
                throw new MissingInputException('Aborted.');
            } elseif ("\177" === $c) { // Backspace Character
                if (0 === $numMatches && 0 !== $i) {
                    --$i;
                    $cursor->moveLeft(s($fullChoice)->slice(-1)->width(false));

                    $fullChoice = self::substr($fullChoice, 0, $i);
                }

                if (0 === $i) {
                    $ofs = -1;
                    $matches = $autocomplete($ret);
                    $numMatches = \count($matches);
                } else {
                    $numMatches = 0;
                }

                // Pop the last character off the end of our string
                $ret = self::substr($ret, 0, $i);
            } elseif ("\033" === $c) {
                // Did we read an escape sequence?
                $c .= fread($inputStream, 2);

                // A = Up Arrow. B = Down Arrow
                if (isset($c[2]) && ('A' === $c[2] || 'B' === $c[2])) {
                    if ('A' === $c[2] && -1 === $ofs) {
                        $ofs = 0;
                    }

                    if (0 === $numMatches) {
                        continue;
                    }

                    $ofs += ('A' === $c[2]) ? -1 : 1;
                    $ofs = ($numMatches + $ofs) % $numMatches;
                }
            } elseif (\ord($c) < 32) {
                if ("\t" === $c || "\n" === $c) {
                    if ($numMatches > 0 && -1 !== $ofs) {
                        $ret = (string) $matches[$ofs];
                        // Echo out remaining chars for current match
                        $remainingCharacters = substr($ret, \strlen(trim($this->mostRecentlyEnteredValue($fullChoice))));
                        $output->write($remainingCharacters);
                        $fullChoice .= $remainingCharacters;
                        $i = (false === $encoding = mb_detect_encoding($fullChoice, null, true)) ? \strlen($fullChoice) : mb_strlen($fullChoice, $encoding);

                        $matches = array_filter(
                            $autocomplete($ret),
                            function ($match) use ($ret) {
                                return '' === $ret || str_starts_with($match, $ret);
                            }
                        );
                        $numMatches = \count($matches);
                        $ofs = -1;
                    }

                    if ("\n" === $c) {
                        $output->write($c);
                        break;
                    }

                    $numMatches = 0;
                }

                continue;
            } else {
                if ("\x80" <= $c) {
                    $c .= fread($inputStream, ["\xC0" => 1, "\xD0" => 1, "\xE0" => 2, "\xF0" => 3][$c & "\xF0"]);
                }

                $output->write($c);
                $ret .= $c;
                $fullChoice .= $c;
                ++$i;

                $tempRet = $ret;

                if ($question instanceof ChoiceQuestion && $question->isMultiselect()) {
                    $tempRet = $this->mostRecentlyEnteredValue($fullChoice);
                }

                $numMatches = 0;
                $ofs = 0;

                foreach ($autocomplete($ret) as $value) {
                    // If typed characters match the beginning chunk of value (e.g. [AcmeDe]moBundle)
                    if (str_starts_with($value, $tempRet)) {
                        $matches[$numMatches++] = $value;
                    }
                }
            }

            $cursor->clearLineAfter();

            if ($numMatches > 0 && -1 !== $ofs) {
                $cursor->savePosition();
                // Write highlighted text, complete the partially entered response
                $charactersEntered = \strlen(trim($this->mostRecentlyEnteredValue($fullChoice)));
                $output->write('<hl>'.OutputFormatter::escapeTrailingBackslash(substr($matches[$ofs], $charactersEntered)).'</hl>');
                $cursor->restorePosition();
            }
        }

        // Reset stty so it behaves normally again
        shell_exec('stty '.$sttyMode);

        return $fullChoice;
    }

    private function mostRecentlyEnteredValue(string $entered): string
    {
        // Determine the most recent value that the user entered
        if (!str_contains($entered, ',')) {
            return $entered;
        }

        $choices = explode(',', $entered);
        if ('' !== $lastChoice = trim($choices[\count($choices) - 1])) {
            return $lastChoice;
        }

        return $entered;
    }

    /**
     * Gets a hidden response from user.
     *
     * @param resource $inputStream The handler resource
     * @param bool     $trimmable   Is the answer trimmable
     *
     * @throws RuntimeException In case the fallback is deactivated and the response cannot be hidden
     */
    private function getHiddenResponse(OutputInterface $output, $inputStream, bool $trimmable = true): string
    {
        if ('\\' === \DIRECTORY_SEPARATOR) {
            $exe = __DIR__.'/../Resources/bin/hiddeninput.exe';

            // handle code running from a phar
            if ('phar:' === substr(__FILE__, 0, 5)) {
                $tmpExe = sys_get_temp_dir().'/hiddeninput.exe';
                copy($exe, $tmpExe);
                $exe = $tmpExe;
            }

            $sExec = shell_exec('"'.$exe.'"');
            $value = $trimmable ? rtrim($sExec) : $sExec;
            $output->writeln('');

            if (isset($tmpExe)) {
                unlink($tmpExe);
            }

            return $value;
        }

        if (self::$stty && Terminal::hasSttyAvailable()) {
            $sttyMode = shell_exec('stty -g');
            shell_exec('stty -echo');
        } elseif ($this->isInteractiveInput($inputStream)) {
            throw new RuntimeException('Unable to hide the response.');
        }

        $value = fgets($inputStream, 4096);

        if (self::$stty && Terminal::hasSttyAvailable()) {
            shell_exec('stty '.$sttyMode);
        }

        if (false === $value) {
            throw new MissingInputException('Aborted.');
        }
        if ($trimmable) {
            $value = trim($value);
        }
        $output->writeln('');

        return $value;
    }

    /**
     * Validates an attempt.
     *
     * @param callable $interviewer A callable that will ask for a question and return the result
     *
     * @throws \Exception In case the max number of attempts has been reached and no valid response has been given
     */
    private function validateAttempts(callable $interviewer, OutputInterface $output, Question $question): mixed
    {
        $error = null;
        $attempts = $question->getMaxAttempts();

        while (null === $attempts || $attempts--) {
            if (null !== $error) {
                $this->writeError($output, $error);
            }

            try {
                return $question->getValidator()($interviewer());
            } catch (RuntimeException $e) {
                throw $e;
            } catch (\Exception $error) {
            }
        }

        throw $error;
    }

    private function isInteractiveInput($inputStream): bool
    {
        if ('php://stdin' !== (stream_get_meta_data($inputStream)['uri'] ?? null)) {
            return false;
        }

        if (isset(self::$stdinIsInteractive)) {
            return self::$stdinIsInteractive;
        }

        if (\function_exists('stream_isatty')) {
            return self::$stdinIsInteractive = @stream_isatty(fopen('php://stdin', 'r'));
        }

        if (\function_exists('posix_isatty')) {
            return self::$stdinIsInteractive = @posix_isatty(fopen('php://stdin', 'r'));
        }

        if (!\function_exists('exec')) {
            return self::$stdinIsInteractive = true;
        }

        exec('stty 2> /dev/null', $output, $status);

        return self::$stdinIsInteractive = 1 !== $status;
    }

    /**
     * Reads one or more lines of input and returns what is read.
     *
     * @param resource $inputStream The handler resource
     * @param Question $question    The question being asked
     */
    private function readInput($inputStream, Question $question): string|false
    {
        if (!$question->isMultiline()) {
            $cp = $this->setIOCodepage();
            $ret = fgets($inputStream, 4096);

            return $this->resetIOCodepage($cp, $ret);
        }

        $multiLineStreamReader = $this->cloneInputStream($inputStream);
        if (null === $multiLineStreamReader) {
            return false;
        }

        $ret = '';
        $cp = $this->setIOCodepage();
        while (false !== ($char = fgetc($multiLineStreamReader))) {
            if (\PHP_EOL === "{$ret}{$char}") {
                break;
            }
            $ret .= $char;
        }

        return $this->resetIOCodepage($cp, $ret);
    }

    private function setIOCodepage(): int
    {
        if (\function_exists('sapi_windows_cp_set')) {
            $cp = sapi_windows_cp_get();
            sapi_windows_cp_set(sapi_windows_cp_get('oem'));

            return $cp;
        }

        return 0;
    }

    /**
     * Sets console I/O to the specified code page and converts the user input.
     */
    private function resetIOCodepage(int $cp, string|false $input): string|false
    {
        if (0 !== $cp) {
            sapi_windows_cp_set($cp);

            if (false !== $input && '' !== $input) {
                $input = sapi_windows_cp_conv(sapi_windows_cp_get('oem'), $cp, $input);
            }
        }

        return $input;
    }

    /**
     * Clones an input stream in order to act on one instance of the same
     * stream without affecting the other instance.
     *
     * @param resource $inputStream The handler resource
     *
     * @return resource|null The cloned resource, null in case it could not be cloned
     */
    private function cloneInputStream($inputStream)
    {
        $streamMetaData = stream_get_meta_data($inputStream);
        $seekable = $streamMetaData['seekable'] ?? false;
        $mode = $streamMetaData['mode'] ?? 'rb';
        $uri = $streamMetaData['uri'] ?? null;

        if (null === $uri) {
            return null;
        }

        $cloneStream = fopen($uri, $mode);

        // For seekable and writable streams, add all the same data to the
        // cloned stream and then seek to the same offset.
        if (true === $seekable && !\in_array($mode, ['r', 'rb', 'rt'])) {
            $offset = ftell($inputStream);
            rewind($inputStream);
            stream_copy_to_stream($inputStream, $cloneStream);
            fseek($inputStream, $offset);
            fseek($cloneStream, $offset);
        }

        return $cloneStream;
    }
}

• [F] DebugFormatterHelper.php
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• [F] DescriptorHelper.php
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• [F] Dumper.php
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• [F] FormatterHelper.php
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• [F] Helper.php
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• [F] HelperInterface.php
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• [F] HelperSet.php
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• [F] InputAwareHelper.php
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• [F] ProcessHelper.php
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• [F] ProgressBar.php
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• [F] ProgressIndicator.php
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• [F] QuestionHelper.php
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• [F] SymfonyQuestionHelper.php
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• [F] Table.php
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• [F] TableCell.php
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• [F] TableCellStyle.php
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• [F] TableRows.php
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• [F] TableSeparator.php
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• [F] TableStyle.php
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About Section

About NFC Pay: Our Story and Mission

NFC Pay was founded with a vision to transform the way people handle transactions. Our journey is defined by a commitment to innovation, security, and convenience. We strive to deliver seamless, user-friendly payment solutions that make everyday transactions effortless and secure. Our mission is to empower you to pay with ease and confidence, anytime, anywhere.

• Simplifying Payments, One Tap at a Time.
• Reinventing Your Wallet for Modern Convenience.
• Smart Payments for a Effortless Lifestyle.
• Experience the Ease of Tap and Pay.
• Innovative Solutions for Your Daily Transactions.

FAQ Section

Frequently Asked Questions About NFC Pay

Here are answers to some common questions about NFC Pay. We aim to provide clear and concise information to help you understand how our platform works and how it can benefit you. If you have any further inquiries, please don’t hesitate to contact our support team.

How do I register for NFC Pay?

Download the app and sign up using your email or phone number, then complete the verification process.

Is my payment information secure?

Yes, we use advanced encryption and security protocols to protect your payment details.

Can I add multiple cards to my NFC Pay wallet?

Absolutely, you can link multiple debit or credit cards to your wallet.

How do I transfer money to another user?

Go to the transfer section, select the recipient, enter the amount, and authorize the transfer.

What should I do if I forget my PIN?

Use the “Forgot PIN” feature in the app to reset it following the provided instructions.

How can I activate my merchant account?

Sign up for a merchant account through the app and follow the setup instructions to start accepting payments.

Can I track my payment status?

Yes, you can view and track your payment status in the account dashboard