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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 code points encoded as UTF-8.

 *

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

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

 *

 * @throws ExceptionInterface

 */

class CodePointString extends AbstractUnicodeString

{

    public function __construct(string $string = '')

    {

        if ('' !== $string && !preg_match('//u', $string)) {

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

        }

        $this->string = $string;

    }

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

    {

        $str = clone $this;

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

        if (!preg_match('//u', $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 .= '.{65535}';

            $length -= 65535;

        }

        $rx .= '.{'.$length.'})/us';

        $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 codePointsAt(int $offset): array

    {

        $str = $offset ? $this->slice($offset, 1) : $this;

        return '' === $str->string ? [] : [mb_ord($str->string, 'UTF-8')];

    }

    public function endsWith(string|iterable|AbstractString $suffix): bool

    {

        if ($suffix instanceof AbstractString) {

            $suffix = $suffix->string;

        } elseif (!\is_string($suffix)) {

            return parent::endsWith($suffix);

        }

        if ('' === $suffix || !preg_match('//u', $suffix)) {

            return false;

        }

        if ($this->ignoreCase) {

            return preg_match('{'.preg_quote($suffix).'$}iuD', $this->string);

        }

        return \strlen($this->string) >= \strlen($suffix) && 0 === substr_compare($this->string, $suffix, -\strlen($suffix));

    }

    public function equalsTo(string|iterable|AbstractString $string): bool

    {

        if ($string instanceof AbstractString) {

            $string = $string->string;

        } elseif (!\is_string($string)) {

            return parent::equalsTo($string);

        }

        if ('' !== $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);

        }

        if ('' === $needle) {

            return null;

        }

        $i = $this->ignoreCase ? mb_stripos($this->string, $needle, $offset, 'UTF-8') : mb_strpos($this->string, $needle, $offset, 'UTF-8');

        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);

        }

        if ('' === $needle) {

            return null;

        }

        $i = $this->ignoreCase ? mb_strripos($this->string, $needle, $offset, 'UTF-8') : mb_strrpos($this->string, $needle, $offset, 'UTF-8');

        return false === $i ? null : $i;

    }

    public function length(): int

    {

        return mb_strlen($this->string, 'UTF-8');

    }

    public function prepend(string ...$prefix): static

    {

        $str = clone $this;

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

        if (!preg_match('//u', $str->string)) {

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

        }

        return $str;

    }

    public function replace(string $from, string $to): static

    {

        $str = clone $this;

        if ('' === $from || !preg_match('//u', $from)) {

            return $str;

        }

        if ('' !== $to && !preg_match('//u', $to)) {

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

        }

        if ($this->ignoreCase) {

            $str->string = implode($to, preg_split('{'.preg_quote($from).'}iuD', $this->string));

        } else {

            $str->string = str_replace($from, $to, $this->string);

        }

        return $str;

    }

    public function slice(int $start = 0, int $length = null): static

    {

        $str = clone $this;

        $str->string = mb_substr($this->string, $start, $length, 'UTF-8');

        return $str;

    }

    public function splice(string $replacement, int $start = 0, int $length = null): static

    {

        if (!preg_match('//u', $replacement)) {

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

        }

        $str = clone $this;

        $start = $start ? \strlen(mb_substr($this->string, 0, $start, 'UTF-8')) : 0;

        $length = $length ? \strlen(mb_substr($this->string, $start, $length, 'UTF-8')) : $length;

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

        return $str;

    }

    public function split(string $delimiter, int $limit = null, int $flags = null): array

    {

        if (1 > $limit ??= \PHP_INT_MAX) {

            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);

        }

        if (!preg_match('//u', $delimiter)) {

            throw new InvalidArgumentException('Split delimiter is not a valid UTF-8 string.');

        }

        $str = clone $this;

        $chunks = $this->ignoreCase

            ? preg_split('{'.preg_quote($delimiter).'}iuD', $this->string, $limit)

            : explode($delimiter, $this->string, $limit);

        foreach ($chunks as &$chunk) {

            $str->string = $chunk;

            $chunk = 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);

        }

        if ('' === $prefix || !preg_match('//u', $prefix)) {

            return false;

        }

        if ($this->ignoreCase) {

            return 0 === mb_stripos($this->string, $prefix, 0, 'UTF-8');

        }

        return 0 === strncmp($this->string, $prefix, \strlen($prefix));

    }

}