class UnicodeString

class UnicodeString extends AbstractUnicodeString {
    public function __construct(string $string = '') {
        if ('' === $string || normalizer_is_normalized($this->string = $string)) {
            return;
        }
        if (false === ($string = normalizer_normalize($string))) {
            throw new InvalidArgumentException('Invalid UTF-8 string.');
        }
        $this->string = $string;
    }
    public function append(string ...$suffix) : static {
        $str = clone $this;
        $str->string = $this->string . (1 >= \count($suffix) ? $suffix[0] ?? '' : implode('', $suffix));
        if (normalizer_is_normalized($str->string)) {
            return $str;
        }
        if (false === ($string = normalizer_normalize($str->string))) {
            throw new InvalidArgumentException('Invalid UTF-8 string.');
        }
        $str->string = $string;
        return $str;
    }
    public function chunk(int $length = 1) : array {
        if (1 > $length) {
            throw new InvalidArgumentException('The chunk length must be greater than zero.');
        }
        if ('' === $this->string) {
            return [];
        }
        $rx = '/(';
        while (65535 < $length) {
            $rx .= '\\X{65535}';
            $length -= 65535;
        }
        $rx .= '\\X{' . $length . '})/u';
        $str = clone $this;
        $chunks = [];
        foreach (preg_split($rx, $this->string, -1, \PREG_SPLIT_DELIM_CAPTURE | \PREG_SPLIT_NO_EMPTY) as $chunk) {
            $str->string = $chunk;
            $chunks[] = clone $str;
        }
        return $chunks;
    }
    public function endsWith(string|iterable|AbstractString $suffix) : bool {
        if ($suffix instanceof AbstractString) {
            $suffix = $suffix->string;
        }
        elseif (!\is_string($suffix)) {
            return parent::endsWith($suffix);
        }
        $form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;
        normalizer_is_normalized($suffix, $form) ?: ($suffix = normalizer_normalize($suffix, $form));
        if ('' === $suffix || false === $suffix) {
            return false;
        }
        if ($this->ignoreCase) {
            return 0 === mb_stripos(grapheme_extract($this->string, \strlen($suffix), \GRAPHEME_EXTR_MAXBYTES, \strlen($this->string) - \strlen($suffix)), $suffix, 0, 'UTF-8');
        }
        return $suffix === grapheme_extract($this->string, \strlen($suffix), \GRAPHEME_EXTR_MAXBYTES, \strlen($this->string) - \strlen($suffix));
    }
    public function equalsTo(string|iterable|AbstractString $string) : bool {
        if ($string instanceof AbstractString) {
            $string = $string->string;
        }
        elseif (!\is_string($string)) {
            return parent::equalsTo($string);
        }
        $form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;
        normalizer_is_normalized($string, $form) ?: ($string = normalizer_normalize($string, $form));
        if ('' !== $string && false !== $string && $this->ignoreCase) {
            return \strlen($string) === \strlen($this->string) && 0 === mb_stripos($this->string, $string, 0, 'UTF-8');
        }
        return $string === $this->string;
    }
    public function indexOf(string|iterable|AbstractString $needle, int $offset = 0) : ?int {
        if ($needle instanceof AbstractString) {
            $needle = $needle->string;
        }
        elseif (!\is_string($needle)) {
            return parent::indexOf($needle, $offset);
        }
        $form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;
        normalizer_is_normalized($needle, $form) ?: ($needle = normalizer_normalize($needle, $form));
        if ('' === $needle || false === $needle) {
            return null;
        }
        try {
            $i = $this->ignoreCase ? grapheme_stripos($this->string, $needle, $offset) : grapheme_strpos($this->string, $needle, $offset);
        } catch (\ValueError) {
            return null;
        }
        return false === $i ? null : $i;
    }
    public function indexOfLast(string|iterable|AbstractString $needle, int $offset = 0) : ?int {
        if ($needle instanceof AbstractString) {
            $needle = $needle->string;
        }
        elseif (!\is_string($needle)) {
            return parent::indexOfLast($needle, $offset);
        }
        $form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;
        normalizer_is_normalized($needle, $form) ?: ($needle = normalizer_normalize($needle, $form));
        if ('' === $needle || false === $needle) {
            return null;
        }
        $string = $this->string;
        if (0 > $offset) {
            // workaround https://bugs.php.net/74264
            if (0 > ($offset += grapheme_strlen($needle))) {
                $string = grapheme_substr($string, 0, $offset);
            }
            $offset = 0;
        }
        $i = $this->ignoreCase ? grapheme_strripos($string, $needle, $offset) : grapheme_strrpos($string, $needle, $offset);
        return false === $i ? null : $i;
    }
    public function join(array $strings, ?string $lastGlue = null) : static {
        $str = parent::join($strings, $lastGlue);
        normalizer_is_normalized($str->string) ?: ($str->string = normalizer_normalize($str->string));
        return $str;
    }
    public function length() : int {
        return grapheme_strlen($this->string);
    }
    public function normalize(int $form = self::NFC) : static {
        $str = clone $this;
        if (\in_array($form, [
            self::NFC,
            self::NFKC,
        ], true)) {
            normalizer_is_normalized($str->string, $form) ?: ($str->string = normalizer_normalize($str->string, $form));
        }
        elseif (!\in_array($form, [
            self::NFD,
            self::NFKD,
        ], true)) {
            throw new InvalidArgumentException('Unsupported normalization form.');
        }
        elseif (!normalizer_is_normalized($str->string, $form)) {
            $str->string = normalizer_normalize($str->string, $form);
            $str->ignoreCase = null;
        }
        return $str;
    }
    public function prepend(string ...$prefix) : static {
        $str = clone $this;
        $str->string = (1 >= \count($prefix) ? $prefix[0] ?? '' : implode('', $prefix)) . $this->string;
        if (normalizer_is_normalized($str->string)) {
            return $str;
        }
        if (false === ($string = normalizer_normalize($str->string))) {
            throw new InvalidArgumentException('Invalid UTF-8 string.');
        }
        $str->string = $string;
        return $str;
    }
    public function replace(string $from, string $to) : static {
        $str = clone $this;
        normalizer_is_normalized($from) ?: ($from = normalizer_normalize($from));
        if ('' !== $from && false !== $from) {
            $tail = $str->string;
            $result = '';
            $indexOf = $this->ignoreCase ? 'grapheme_stripos' : 'grapheme_strpos';
            while ('' !== $tail && false !== ($i = $indexOf($tail, $from))) {
                $slice = grapheme_substr($tail, 0, $i);
                $result .= $slice . $to;
                $tail = substr($tail, \strlen($slice) + \strlen($from));
            }
            $str->string = $result . $tail;
            if (normalizer_is_normalized($str->string)) {
                return $str;
            }
            if (false === ($string = normalizer_normalize($str->string))) {
                throw new InvalidArgumentException('Invalid UTF-8 string.');
            }
            $str->string = $string;
        }
        return $str;
    }
    public function replaceMatches(string $fromRegexp, string|callable $to) : static {
        $str = parent::replaceMatches($fromRegexp, $to);
        normalizer_is_normalized($str->string) ?: ($str->string = normalizer_normalize($str->string));
        return $str;
    }
    public function slice(int $start = 0, ?int $length = null) : static {
        $str = clone $this;
        $str->string = (string) grapheme_substr($this->string, $start, $length ?? 2147483647);
        return $str;
    }
    public function splice(string $replacement, int $start = 0, ?int $length = null) : static {
        $str = clone $this;
        $start = $start ? \strlen(grapheme_substr($this->string, 0, $start)) : 0;
        $length = $length ? \strlen(grapheme_substr($this->string, $start, $length)) : $length;
        $str->string = substr_replace($this->string, $replacement, $start, $length ?? 2147483647);
        if (normalizer_is_normalized($str->string)) {
            return $str;
        }
        if (false === ($string = normalizer_normalize($str->string))) {
            throw new InvalidArgumentException('Invalid UTF-8 string.');
        }
        $str->string = $string;
        return $str;
    }
    public function split(string $delimiter, ?int $limit = null, ?int $flags = null) : array {
        if (1 > ($limit ??= 2147483647)) {
            throw new InvalidArgumentException('Split limit must be a positive integer.');
        }
        if ('' === $delimiter) {
            throw new InvalidArgumentException('Split delimiter is empty.');
        }
        if (null !== $flags) {
            return parent::split($delimiter . 'u', $limit, $flags);
        }
        normalizer_is_normalized($delimiter) ?: ($delimiter = normalizer_normalize($delimiter));
        if (false === $delimiter) {
            throw new InvalidArgumentException('Split delimiter is not a valid UTF-8 string.');
        }
        $str = clone $this;
        $tail = $this->string;
        $chunks = [];
        $indexOf = $this->ignoreCase ? 'grapheme_stripos' : 'grapheme_strpos';
        while (1 < $limit && false !== ($i = $indexOf($tail, $delimiter))) {
            $str->string = grapheme_substr($tail, 0, $i);
            $chunks[] = clone $str;
            $tail = substr($tail, \strlen($str->string) + \strlen($delimiter));
            --$limit;
        }
        $str->string = $tail;
        $chunks[] = clone $str;
        return $chunks;
    }
    public function startsWith(string|iterable|AbstractString $prefix) : bool {
        if ($prefix instanceof AbstractString) {
            $prefix = $prefix->string;
        }
        elseif (!\is_string($prefix)) {
            return parent::startsWith($prefix);
        }
        $form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;
        normalizer_is_normalized($prefix, $form) ?: ($prefix = normalizer_normalize($prefix, $form));
        if ('' === $prefix || false === $prefix) {
            return false;
        }
        if ($this->ignoreCase) {
            return 0 === mb_stripos(grapheme_extract($this->string, \strlen($prefix), \GRAPHEME_EXTR_MAXBYTES), $prefix, 0, 'UTF-8');
        }
        return $prefix === grapheme_extract($this->string, \strlen($prefix), \GRAPHEME_EXTR_MAXBYTES);
    }
    public function __wakeup() : void {
        if (!\is_string($this->string)) {
            throw new \BadMethodCallException('Cannot unserialize ' . __CLASS__);
        }
        normalizer_is_normalized($this->string) ?: ($this->string = normalizer_normalize($this->string));
    }
    public function __clone() {
        if (null === $this->ignoreCase) {
            normalizer_is_normalized($this->string) ?: ($this->string = normalizer_normalize($this->string));
        }
        $this->ignoreCase = false;
    }

}