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<?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\String;

use Symfony\Component\String\Exception\ExceptionInterface;

use Symfony\Component\String\Exception\InvalidArgumentException;

/**

 * Represents a string of Unicode grapheme clusters encoded as UTF-8.

 *

 * A letter followed by combining characters (accents typically) form what Unicode defines

 * as a grapheme cluster: a character as humans mean it in written texts. This class knows

 * about the concept and won't split a letter apart from its combining accents. It also

 * ensures all string comparisons happen on their canonically-composed representation,

 * ignoring e.g. the order in which accents are listed when a letter has many of them.

 *

 * @see https://unicode.org/reports/tr15/

 *

 * @author Nicolas Grekas <p@tchwork.com>

 * @author Hugo Hamon <hugohamon@neuf.fr>

 *

 * @throws ExceptionInterface

 */

class UnicodeString extends AbstractUnicodeString

{

    public function __construct(string $string = '')

    {

        $this->string = normalizer_is_normalized($string) ? $string : normalizer_normalize($string);

        if (false === $this->string) {

            throw new InvalidArgumentException('Invalid UTF-8 string.');

        }

    }

    public function append(string ...$suffix): static

    {

        $str = clone $this;

        $str->string = $this->string.(1 >= \count($suffix) ? ($suffix[0] ?? '') : implode('', $suffix));

        normalizer_is_normalized($str->string) ?: $str->string = normalizer_normalize($str->string);

        if (false === $str->string) {

            throw new InvalidArgumentException('Invalid UTF-8 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;

        normalizer_is_normalized($str->string) ?: $str->string = normalizer_normalize($str->string);

        if (false === $str->string) {

            throw new InvalidArgumentException('Invalid UTF-8 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;

            normalizer_is_normalized($str->string) ?: $str->string = normalizer_normalize($str->string);

            if (false === $str->string) {

                throw new InvalidArgumentException('Invalid UTF-8 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 ?? 2147483647)) : $length;

        $str->string = substr_replace($this->string, $replacement, $start, $length ?? 2147483647);

        normalizer_is_normalized($str->string) ?: $str->string = normalizer_normalize($str->string);

        if (false === $str->string) {

            throw new InvalidArgumentException('Invalid UTF-8 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()

    {

        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;

    }

}