<?php declare(strict_types=1);

namespace Orbit;

class Util
{
    /**
     * View hex chars of string
     *
     * Outputs a listing of hexidecimal values in 16 byte rows
     *
     * @param string $text Input text
     * @return string
     */
    public static function hexView(string $text): string
    {
        $width = 16;
        $outStr = '';

        // Specifically not using mb_strlen to get every byte
        $charCount = strlen($text);
        for ($i = 0; $i < $charCount; $i += $width) {
            $printStr = '';
            for ($j = 0; $j < $width; $j++) {
                $char = (string) substr($text, $i+$j, 1);

                $outStr .= sprintf("%02X", ord($char)) . " ";

                if (ord($char) >= 32 && ord($char) < 127) {
                    $printStr .= $char;
                } else {
                    $printStr .= ".";
                }
            }

            $outStr .= " | " . $printStr . "\n";
        }

        return $outStr;
    }
}