<?php

declare (strict_types=1);
namespace LWVendor\Rahul900day\Gpt3Encoder;

class Character
{
    protected static array $characters;
    public static function fromBytes(array $bytes) : string
    {
        $word = '';
        foreach ($bytes as $byte) {
            $word .= self::getCharacters()[$byte];
        }
        return $word;
    }
    public static function toBytes(string $word) : array
    {
        $bytes = [];
        $characters = \mb_str_split($word);
        foreach ($characters as $character) {
            $bytes[] = \array_search($character, self::getCharacters());
        }
        return $bytes;
    }
    protected static function getCharacters() : array
    {
        if (isset(self::$characters)) {
            return self::$characters;
        }
        $asciiByteRange = \range(\mb_ord('!'), \mb_ord('~'));
        $latinByteRange = \range(\mb_ord('¡'), \mb_ord('¬'));
        $extendedLatinByteRange = \range(\mb_ord('®'), \mb_ord('ÿ'));
        $byteValues = [...$asciiByteRange, ...$latinByteRange, ...$extendedLatinByteRange];
        $unicodeValues = $byteValues;
        $unicodeValueCounter = 0;
        for ($byte = 0; $byte < 2 ** 8; $byte++) {
            if (!\in_array($byte, $byteValues)) {
                $byteValues[] = $byte;
                $unicodeValues[] = 2 ** 8 + $unicodeValueCounter;
                $unicodeValueCounter++;
            }
        }
        $unicodeCharacters = \array_map('mb_chr', $unicodeValues);
        $charactersMap = [];
        foreach ($byteValues as $i => $byteValue) {
            $charactersMap[$byteValue] = $unicodeCharacters[$i];
        }
        self::$characters = $charactersMap;
        return self::$characters;
    }
}