<?php
/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com> and Trevor Rowbotham <trevor.rowbotham@pm.me>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * Modified to the needs of SnappyMail
 */

namespace SnappyMail\Intl;

class Info
{
	public
		$bidiDomain = false,
		$errors = 0,
		$validBidiDomain = true,
		$transitionalDifferent = false;
}

/**
 * @see https://www.unicode.org/reports/tr46/
 */
final class Idn
{
	public const
		ERROR_EMPTY_LABEL = 1,
		ERROR_LABEL_TOO_LONG = 2,
		ERROR_DOMAIN_NAME_TOO_LONG = 4,
		ERROR_LEADING_HYPHEN = 8,
		ERROR_TRAILING_HYPHEN = 0x10,
		ERROR_HYPHEN_3_4 = 0x20,
		ERROR_LEADING_COMBINING_MARK = 0x40,
		ERROR_DISALLOWED = 0x80,
		ERROR_PUNYCODE = 0x100,
		ERROR_LABEL_HAS_DOT = 0x200,
		ERROR_INVALID_ACE_LABEL = 0x400,
		ERROR_BIDI = 0x800,
		ERROR_CONTEXTJ = 0x1000,
		ERROR_CONTEXTO_PUNCTUATION = 0x2000,
		ERROR_CONTEXTO_DIGITS = 0x4000,

		INTL_IDNA_VARIANT_UTS46 = 1,

		IDNA_DEFAULT = 0,
		IDNA_ALLOW_UNASSIGNED = 1,
		IDNA_USE_STD3_RULES = 2,
		IDNA_CHECK_BIDI = 4,
		IDNA_CHECK_CONTEXTJ = 8,
		IDNA_NONTRANSITIONAL_TO_ASCII = 16,
		IDNA_NONTRANSITIONAL_TO_UNICODE = 32,

		MAX_DOMAIN_SIZE = 253,
		MAX_LABEL_SIZE = 63,

		BASE = 36,
		TMIN = 1,
		TMAX = 26,
		SKEW = 38,
		DAMP = 700,
		INITIAL_BIAS = 72,
		INITIAL_N = 128,
		DELIMITER = '-',
		MAX_INT = 2147483647,

		REGEX_COMBINING_MARK = 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	/**
	 * Contains the numeric value of a basic code point (for use in representing integers) in the
	 * range 0 to BASE-1, or -1 if b is does not represent a value.
	 *
	 * @var array<int, int>
	 */
	private static $basicToDigit = [
		48 => 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
		65 =>  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,
		97 =>  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25
	];

	/**
	 * @var array<int, int>
	 */
	private static $virama;

	/**
	 * @var array<int, string>
	 */
	private static $mapped;

	/**
	 * @var array<int, bool>
	 */
	private static $ignored;

	/**
	 * @var array<int, string>
	 */
	private static $deviation;

	/**
	 * @var array<int, bool>
	 */
	private static $disallowed;

	/**
	 * @var array<int, string>
	 */
	private static $disallowed_STD3_mapped;

	/**
	 * @var array<int, bool>
	 */
	private static $disallowed_STD3_valid;

	/**
	 * @var bool
	 */
	private static $mappingTableLoaded = false;

	/**
	 * @see https://www.unicode.org/reports/tr46/#ToASCII
	 *
	 * @param string $domainName
	 *
	 * @return string|false
	 */
	public static function toAscii($domainName)
	{
		$info = new Info();
		$labels = self::process((string) $domainName, $info);

		foreach ($labels as $i => $label) {
			// Only convert labels to punycode that contain non-ASCII code points
			if (1 === \preg_match('/[^\x00-\x7F]/', $label)) {
				try {
					$label = 'xn--'.self::punycodeEncode($label);
				} catch (\Exception $e) {
					$info->errors |= self::ERROR_PUNYCODE;
				}

				$labels[$i] = $label;
			}
		}

		self::validateDomainAndLabelLength($labels, $info);

		return $info->errors ? false : \implode('.', $labels);
	}

	/**
	 * @see https://www.unicode.org/reports/tr46/#ToUnicode
	 *
	 * @param string $domainName
	 *
	 * @return string|false
	 */
	public static function toUtf8($domainName)
	{
		$info = new Info();
		$labels = self::process((string) $domainName, $info);
		return 0 === $info->errors ? \implode('.', $labels) : false;
	}

	/**
	 * @param string $label
	 *
	 * @return bool
	 */
	private static function isValidContextJ(array $codePoints, $label)
	{
		if (!isset(self::$virama)) {
			self::$virama = static::getData('virama');
		}

		$offset = 0;

		foreach ($codePoints as $i => $codePoint) {
			if (0x200C !== $codePoint && 0x200D !== $codePoint) {
				continue;
			}

			if (!isset($codePoints[$i - 1])) {
				return false;
			}

			// If Canonical_Combining_Class(Before(cp)) .eq. Virama Then True;
			if (isset(self::$virama[$codePoints[$i - 1]])) {
				continue;
			}

			// If RegExpMatch((Joining_Type:{L,D})(Joining_Type:T)*\u200C(Joining_Type:T)*(Joining_Type:{R,D})) Then
			// True;
			// Generated RegExp = ([Joining_Type:{L,D}][Joining_Type:T]*\u200C[Joining_Type:T]*)[Joining_Type:{R,D}]
			if (0x200C === $codePoint && 1 === \preg_match(static::REGEX_ZWNJ, $label, $matches, \PREG_OFFSET_CAPTURE, $offset)) {
				$offset += \strlen($matches[1][0]);

				continue;
			}

			return false;
		}

		return true;
	}

	/**
	 * @see https://www.unicode.org/reports/tr46/#ProcessingStepMap
	 *
	 * @param string              $input
	 * @param array<string, bool> $options
	 *
	 * @return string
	 */
	private static function mapCodePoints($input, array $options, Info $info)
	{
		$str = '';
		$transitional = $options['Transitional_Processing'];

		foreach (self::utf8Decode($input) as $codePoint) {
			$data = self::lookupCodePointStatus($codePoint);

			switch ($data['status']) {
				case 'disallowed':
					$info->errors |= self::ERROR_DISALLOWED;

					// no break.

				case 'valid':
					$str .= \mb_chr($codePoint, 'utf-8');

					break;

				case 'ignored':
					// Do nothing.
					break;

				case 'mapped':
					$str .= $data['mapping'];

					break;

				case 'deviation':
					$info->transitionalDifferent = true;
					$str .= ($transitional ? $data['mapping'] : mb_chr($codePoint, 'utf-8'));

					break;
			}
		}

		return $str;
	}

	/**
	 * @see https://www.unicode.org/reports/tr46/#Processing
	 *
	 * @param string              $domain
	 *
	 * @return array<int, string>
	 */
	private static function process($domain, Info $info)
	{
		if ('' === $domain) {
			$info->errors |= self::ERROR_EMPTY_LABEL;

			return [$domain];
		}

		$options = [
			'CheckBidi' => false,
			'Transitional_Processing' => true
		];

		// Step 1. Map each code point in the domain name string
		$domain = self::mapCodePoints($domain, $options, $info);

		// Step 2. Normalize the domain name string to Unicode Normalization Form C.
		$domain = static::normalize($domain);

		// Step 3. Break the string into labels at U+002E (.) FULL STOP.
		$labels = explode('.', $domain);
		$lastLabelIndex = \count($labels) - 1;

		// Step 4. Convert and validate each label in the domain name string.
		foreach ($labels as $i => $label) {
			$validationOptions = $options;

			if ('xn--' === \substr($label, 0, 4)) {
				try {
					$label = self::punycodeDecode(substr($label, 4));
				} catch (\Exception $e) {
					$info->errors |= self::ERROR_PUNYCODE;

					continue;
				}

				$validationOptions['Transitional_Processing'] = false;
				$labels[$i] = $label;
			}

			self::validateLabel($label, $info, $validationOptions, $i > 0 && $i === $lastLabelIndex);
		}

		if ($info->bidiDomain && !$info->validBidiDomain) {
			$info->errors |= self::ERROR_BIDI;
		}

		// Any input domain name string that does not record an error has been successfully
		// processed according to this specification. Conversely, if an input domain_name string
		// causes an error, then the processing of the input domain_name string fails. Determining
		// what to do with error input is up to the caller, and not in the scope of this document.
		return $labels;
	}

	/**
	 * @see https://tools.ietf.org/html/rfc5893#section-2
	 *
	 * @param string $label
	 */
	private static function validateBidiLabel($label, Info $info)
	{
		if (1 === \preg_match(static::REGEX_RTL_LABEL, $label)) {
			$info->bidiDomain = true;

			// Step 1. The first character must be a character with Bidi property L, R, or AL.
			// If it has the R or AL property, it is an RTL label
			if (1 !== \preg_match(static::REGEX_BIDI_STEP_1_RTL, $label)) {
				$info->validBidiDomain = false;

				return;
			}

			// Step 2. In an RTL label, only characters with the Bidi properties R, AL, AN, EN, ES,
			// CS, ET, ON, BN, or NSM are allowed.
			if (1 === \preg_match(static::REGEX_BIDI_STEP_2, $label)) {
				$info->validBidiDomain = false;

				return;
			}

			// Step 3. In an RTL label, the end of the label must be a character with Bidi property
			// R, AL, EN, or AN, followed by zero or more characters with Bidi property NSM.
			if (1 !== \preg_match(static::REGEX_BIDI_STEP_3, $label)) {
				$info->validBidiDomain = false;

				return;
			}

			// Step 4. In an RTL label, if an EN is present, no AN may be present, and vice versa.
			if (1 === \preg_match(static::REGEX_BIDI_STEP_4_AN, $label) && 1 === \preg_match(static::REGEX_BIDI_STEP_4_EN, $label)) {
				$info->validBidiDomain = false;

				return;
			}

			return;
		}

		// We are a LTR label
		// Step 1. The first character must be a character with Bidi property L, R, or AL.
		// If it has the L property, it is an LTR label.
		if (1 !== preg_match(static::REGEX_BIDI_STEP_1_LTR, $label)) {
			$info->validBidiDomain = false;

			return;
		}

		// Step 5. In an LTR label, only characters with the Bidi properties L, EN,
		// ES, CS, ET, ON, BN, or NSM are allowed.
		if (1 === preg_match(static::REGEX_BIDI_STEP_5, $label)) {
			$info->validBidiDomain = false;

			return;
		}

		// Step 6.In an LTR label, the end of the label must be a character with Bidi property L or
		// EN, followed by zero or more characters with Bidi property NSM.
		if (1 !== preg_match(static::REGEX_BIDI_STEP_6, $label)) {
			$info->validBidiDomain = false;

			return;
		}
	}

	/**
	 * @param array<int, string> $labels
	 */
	private static function validateDomainAndLabelLength(array $labels, Info $info)
	{
		$maxDomainSize = self::MAX_DOMAIN_SIZE;
		$length = \count($labels);

		// Number of "." delimiters.
		$domainLength = $length - 1;

		// If the last label is empty and it is not the first label, then it is the root label.
		// Increase the max size by 1, making it 254, to account for the root label's "."
		// delimiter. This also means we don't need to check the last label's length for being too
		// long.
		if ($length > 1 && '' === $labels[$length - 1]) {
			++$maxDomainSize;
			--$length;
		}

		for ($i = 0; $i < $length; ++$i) {
			$bytes = \strlen($labels[$i]);
			$domainLength += $bytes;

			if ($bytes > self::MAX_LABEL_SIZE) {
				$info->errors |= self::ERROR_LABEL_TOO_LONG;
			}
		}

		if ($domainLength > $maxDomainSize) {
			$info->errors |= self::ERROR_DOMAIN_NAME_TOO_LONG;
		}
	}

	/**
	 * @see https://www.unicode.org/reports/tr46/#Validity_Criteria
	 *
	 * @param string              $label
	 * @param array<string, bool> $options
	 * @param bool                $canBeEmpty
	 */
	private static function validateLabel($label, Info $info, array $options, $canBeEmpty)
	{
		if ('' === $label) {
			if (!$canBeEmpty) {
				$info->errors |= self::ERROR_EMPTY_LABEL;
			}

			return;
		}

		// Step 1. The label must be in Unicode Normalization Form C.
		if (!static::isNormalized($label)) {
			$info->errors |= self::ERROR_INVALID_ACE_LABEL;
		}

		$codePoints = self::utf8Decode($label);

		// Step 2. If CheckHyphens, the label must not contain a U+002D HYPHEN-MINUS character
		// in both the thrid and fourth positions.
		if (isset($codePoints[2], $codePoints[3]) && 0x002D === $codePoints[2] && 0x002D === $codePoints[3]) {
			$info->errors |= self::ERROR_HYPHEN_3_4;
		}

		// Step 3. If CheckHyphens, the label must neither begin nor end with a U+002D
		// HYPHEN-MINUS character.
		if ('-' === substr($label, 0, 1)) {
			$info->errors |= self::ERROR_LEADING_HYPHEN;
		}

		if ('-' === substr($label, -1, 1)) {
			$info->errors |= self::ERROR_TRAILING_HYPHEN;
		}

		// Step 4. The label must not contain a U+002E (.) FULL STOP.
		if (false !== strpos($label, '.')) {
			$info->errors |= self::ERROR_LABEL_HAS_DOT;
		}

		// Step 5. The label must not begin with a combining mark, that is: General_Category=Mark.
		if (1 === preg_match(static::REGEX_COMBINING_MARK, $label)) {
			$info->errors |= self::ERROR_LEADING_COMBINING_MARK;
		}

		// Step 6. Each code point in the label must only have certain status values according to
		// Section 5, IDNA Mapping Table:
		$transitional = $options['Transitional_Processing'];

		foreach ($codePoints as $codePoint) {
			$data = self::lookupCodePointStatus($codePoint);
			$status = $data['status'];

			if ('valid' === $status || (!$transitional && 'deviation' === $status)) {
				continue;
			}

			$info->errors |= self::ERROR_DISALLOWED;

			break;
		}

		// Step 7. The label must satisify the ContextJ rules from Appendix A, in
		// The Unicode Code Points and Internationalized Domain Names for Applications (IDNA)
		// [IDNA2008].
		if (!self::isValidContextJ($codePoints, $label)) {
			$info->errors |= self::ERROR_CONTEXTJ;
		}

		// Step 8. If CheckBidi, and if the domain name is a  Bidi domain name, then the label must
		// satisfy all six of the numbered conditions in [IDNA2008] RFC 5893, Section 2.
		if ($options['CheckBidi'] && (!$info->bidiDomain || $info->validBidiDomain)) {
			self::validateBidiLabel($label, $info);
		}
	}

	/**
	 * @see https://tools.ietf.org/html/rfc3492#section-6.2
	 *
	 * @param string $input
	 *
	 * @return string
	 */
	private static function punycodeDecode($input)
	{
		$n = self::INITIAL_N;
		$out = 0;
		$i = 0;
		$bias = self::INITIAL_BIAS;
		$lastDelimIndex = strrpos($input, self::DELIMITER);
		$b = false === $lastDelimIndex ? 0 : $lastDelimIndex;
		$inputLength = \strlen($input);
		$output = [];
		$bytes = array_map('ord', str_split($input));

		for ($j = 0; $j < $b; ++$j) {
			if ($bytes[$j] > 0x7F) {
				throw new \Exception('Invalid input');
			}

			$output[$out++] = $input[$j];
		}

		if ($b > 0) {
			++$b;
		}

		for ($in = $b; $in < $inputLength; ++$out) {
			$oldi = $i;
			$w = 1;

			for ($k = self::BASE; /* no condition */; $k += self::BASE) {
				if ($in >= $inputLength) {
					throw new \Exception('Invalid input');
				}

				$digit = self::$basicToDigit[$bytes[$in++] & 0xFF] ?? -1;

				if ($digit < 0) {
					throw new \Exception('Invalid input');
				}

				if ($digit > intdiv(self::MAX_INT - $i, $w)) {
					throw new \Exception('Integer overflow');
				}

				$i += $digit * $w;

				if ($k <= $bias) {
					$t = self::TMIN;
				} elseif ($k >= $bias + self::TMAX) {
					$t = self::TMAX;
				} else {
					$t = $k - $bias;
				}

				if ($digit < $t) {
					break;
				}

				$baseMinusT = self::BASE - $t;

				if ($w > intdiv(self::MAX_INT, $baseMinusT)) {
					throw new \Exception('Integer overflow');
				}

				$w *= $baseMinusT;
			}

			$outPlusOne = $out + 1;
			$bias = self::adaptBias($i - $oldi, $outPlusOne, 0 === $oldi);

			if (intdiv($i, $outPlusOne) > self::MAX_INT - $n) {
				throw new \Exception('Integer overflow');
			}

			$n += intdiv($i, $outPlusOne);
			$i %= $outPlusOne;
			array_splice($output, $i++, 0, [mb_chr($n, 'utf-8')]);
		}

		return implode('', $output);
	}

	/**
	 * @see https://tools.ietf.org/html/rfc3492#section-6.3
	 *
	 * @param string $input
	 *
	 * @return string
	 */
	private static function punycodeEncode($input)
	{
		$n = self::INITIAL_N;
		$delta = 0;
		$out = 0;
		$bias = self::INITIAL_BIAS;
		$inputLength = 0;
		$output = '';
		$iter = self::utf8Decode($input);

		foreach ($iter as $codePoint) {
			++$inputLength;

			if ($codePoint < 0x80) {
				$output .= \chr($codePoint);
				++$out;
			}
		}

		$h = $out;
		$b = $out;

		if ($b > 0) {
			$output .= self::DELIMITER;
			++$out;
		}

		while ($h < $inputLength) {
			$m = self::MAX_INT;

			foreach ($iter as $codePoint) {
				if ($codePoint >= $n && $codePoint < $m) {
					$m = $codePoint;
				}
			}

			if ($m - $n > intdiv(self::MAX_INT - $delta, $h + 1)) {
				throw new \Exception('Integer overflow');
			}

			$delta += ($m - $n) * ($h + 1);
			$n = $m;

			foreach ($iter as $codePoint) {
				if ($codePoint < $n && 0 === ++$delta) {
					throw new \Exception('Integer overflow');
				}

				if ($codePoint === $n) {
					$q = $delta;

					for ($k = self::BASE; /* no condition */; $k += self::BASE) {
						if ($k <= $bias) {
							$t = self::TMIN;
						} elseif ($k >= $bias + self::TMAX) {
							$t = self::TMAX;
						} else {
							$t = $k - $bias;
						}

						if ($q < $t) {
							break;
						}

						$qMinusT = $q - $t;
						$baseMinusT = self::BASE - $t;
						$output .= self::encodeDigit($t + ($qMinusT) % ($baseMinusT), false);
						++$out;
						$q = intdiv($qMinusT, $baseMinusT);
					}

					$output .= self::encodeDigit($q, false);
					++$out;
					$bias = self::adaptBias($delta, $h + 1, $h === $b);
					$delta = 0;
					++$h;
				}
			}

			++$delta;
			++$n;
		}

		return $output;
	}

	/**
	 * @see https://tools.ietf.org/html/rfc3492#section-6.1
	 *
	 * @param int  $delta
	 * @param int  $numPoints
	 * @param bool $firstTime
	 *
	 * @return int
	 */
	private static function adaptBias($delta, $numPoints, $firstTime)
	{
		// xxx >> 1 is a faster way of doing intdiv(xxx, 2)
		$delta = $firstTime ? intdiv($delta, self::DAMP) : $delta >> 1;
		$delta += intdiv($delta, $numPoints);
		$k = 0;

		while ($delta > ((self::BASE - self::TMIN) * self::TMAX) >> 1) {
			$delta = intdiv($delta, self::BASE - self::TMIN);
			$k += self::BASE;
		}

		return $k + intdiv((self::BASE - self::TMIN + 1) * $delta, $delta + self::SKEW);
	}

	/**
	 * @param int  $d
	 * @param bool $flag
	 *
	 * @return string
	 */
	private static function encodeDigit($d, $flag)
	{
		return \chr($d + 22 + 75 * ($d < 26 ? 1 : 0) - (($flag ? 1 : 0) << 5));
	}

	/**
	 * Takes a UTF-8 encoded string and converts it into a series of integer code points. Any
	 * invalid byte sequences will be replaced by a U+FFFD replacement code point.
	 *
	 * @see https://encoding.spec.whatwg.org/#utf-8-decoder
	 *
	 * @param string $input
	 *
	 * @return array<int, int>
	 */
	private static function utf8Decode($input)
	{
		$bytesSeen = 0;
		$bytesNeeded = 0;
		$lowerBoundary = 0x80;
		$upperBoundary = 0xBF;
		$codePoint = 0;
		$codePoints = [];
		$length = \strlen($input);

		for ($i = 0; $i < $length; ++$i) {
			$byte = \ord($input[$i]);

			if (0 === $bytesNeeded) {
				if ($byte >= 0x00 && $byte <= 0x7F) {
					$codePoints[] = $byte;

					continue;
				}

				if ($byte >= 0xC2 && $byte <= 0xDF) {
					$bytesNeeded = 1;
					$codePoint = $byte & 0x1F;
				} elseif ($byte >= 0xE0 && $byte <= 0xEF) {
					if (0xE0 === $byte) {
						$lowerBoundary = 0xA0;
					} elseif (0xED === $byte) {
						$upperBoundary = 0x9F;
					}

					$bytesNeeded = 2;
					$codePoint = $byte & 0xF;
				} elseif ($byte >= 0xF0 && $byte <= 0xF4) {
					if (0xF0 === $byte) {
						$lowerBoundary = 0x90;
					} elseif (0xF4 === $byte) {
						$upperBoundary = 0x8F;
					}

					$bytesNeeded = 3;
					$codePoint = $byte & 0x7;
				} else {
					$codePoints[] = 0xFFFD;
				}

				continue;
			}

			if ($byte < $lowerBoundary || $byte > $upperBoundary) {
				$codePoint = 0;
				$bytesNeeded = 0;
				$bytesSeen = 0;
				$lowerBoundary = 0x80;
				$upperBoundary = 0xBF;
				--$i;
				$codePoints[] = 0xFFFD;

				continue;
			}

			$lowerBoundary = 0x80;
			$upperBoundary = 0xBF;
			$codePoint = ($codePoint << 6) | ($byte & 0x3F);

			if (++$bytesSeen !== $bytesNeeded) {
				continue;
			}

			$codePoints[] = $codePoint;
			$codePoint = 0;
			$bytesNeeded = 0;
			$bytesSeen = 0;
		}

		// String unexpectedly ended, so append a U+FFFD code point.
		if (0 !== $bytesNeeded) {
			$codePoints[] = 0xFFFD;
		}

		return $codePoints;
	}

	/**
	 * @param int  $codePoint
	 *
	 * @return array{status: string, mapping?: string}
	 */
	private static function lookupCodePointStatus($codePoint)
	{
		if (!self::$mappingTableLoaded) {
			self::$mappingTableLoaded = true;
			self::$mapped = static::getData('mapped');
			self::$ignored = static::getData('ignored');
			self::$deviation = static::getData('deviation');
			self::$disallowed = static::getData('disallowed');
			self::$disallowed_STD3_mapped = static::getData('disallowed_STD3_mapped');
			self::$disallowed_STD3_valid = static::getData('disallowed_STD3_valid');
		}

		if (isset(self::$mapped[$codePoint])) {
			return ['status' => 'mapped', 'mapping' => self::$mapped[$codePoint]];
		}

		if (isset(self::$ignored[$codePoint])) {
			return ['status' => 'ignored'];
		}

		if (isset(self::$deviation[$codePoint])) {
			return ['status' => 'deviation', 'mapping' => self::$deviation[$codePoint]];
		}

		if (isset(self::$disallowed[$codePoint]) || static::inDisallowedRange($codePoint)) {
			return ['status' => 'disallowed'];
		}

		$isDisallowedMapped = isset(self::$disallowed_STD3_mapped[$codePoint]);

		if ($isDisallowedMapped || isset(self::$disallowed_STD3_valid[$codePoint])) {
			$status = 'disallowed';

			$status = $isDisallowedMapped ? 'mapped' : 'valid';

			if ($isDisallowedMapped) {
				return ['status' => $status, 'mapping' => self::$disallowed_STD3_mapped[$codePoint]];
			}

			return ['status' => $status];
		}

		return ['status' => 'valid'];
	}

	private static function inDisallowedRange($codePoint)
	{
		return
			($codePoint >= 128 && $codePoint <= 159)
		 || ($codePoint >= 2155 && $codePoint <= 2207)
		 || ($codePoint >= 3676 && $codePoint <= 3712)
		 || ($codePoint >= 3808 && $codePoint <= 3839)
		 || ($codePoint >= 4059 && $codePoint <= 4095)
		 || ($codePoint >= 4256 && $codePoint <= 4293)
		 || ($codePoint >= 6849 && $codePoint <= 6911)
		 || ($codePoint >= 11859 && $codePoint <= 11903)
		 || ($codePoint >= 42955 && $codePoint <= 42996)
		 || ($codePoint >= 55296 && $codePoint <= 57343)
		 || ($codePoint >= 57344 && $codePoint <= 63743)
		 || ($codePoint >= 64218 && $codePoint <= 64255)
		 || ($codePoint >= 64976 && $codePoint <= 65007)
		 || ($codePoint >= 65630 && $codePoint <= 65663)
		 || ($codePoint >= 65953 && $codePoint <= 65999)
		 || ($codePoint >= 66046 && $codePoint <= 66175)
		 || ($codePoint >= 66518 && $codePoint <= 66559)
		 || ($codePoint >= 66928 && $codePoint <= 67071)
		 || ($codePoint >= 67432 && $codePoint <= 67583)
		 || ($codePoint >= 67760 && $codePoint <= 67807)
		 || ($codePoint >= 67904 && $codePoint <= 67967)
		 || ($codePoint >= 68256 && $codePoint <= 68287)
		 || ($codePoint >= 68528 && $codePoint <= 68607)
		 || ($codePoint >= 68681 && $codePoint <= 68735)
		 || ($codePoint >= 68922 && $codePoint <= 69215)
		 || ($codePoint >= 69298 && $codePoint <= 69375)
		 || ($codePoint >= 69466 && $codePoint <= 69551)
		 || ($codePoint >= 70207 && $codePoint <= 70271)
		 || ($codePoint >= 70517 && $codePoint <= 70655)
		 || ($codePoint >= 70874 && $codePoint <= 71039)
		 || ($codePoint >= 71134 && $codePoint <= 71167)
		 || ($codePoint >= 71370 && $codePoint <= 71423)
		 || ($codePoint >= 71488 && $codePoint <= 71679)
		 || ($codePoint >= 71740 && $codePoint <= 71839)
		 || ($codePoint >= 72026 && $codePoint <= 72095)
		 || ($codePoint >= 72441 && $codePoint <= 72703)
		 || ($codePoint >= 72887 && $codePoint <= 72959)
		 || ($codePoint >= 73130 && $codePoint <= 73439)
		 || ($codePoint >= 73465 && $codePoint <= 73647)
		 || ($codePoint >= 74650 && $codePoint <= 74751)
		 || ($codePoint >= 75076 && $codePoint <= 77823)
		 || ($codePoint >= 78905 && $codePoint <= 82943)
		 || ($codePoint >= 83527 && $codePoint <= 92159)
		 || ($codePoint >= 92784 && $codePoint <= 92879)
		 || ($codePoint >= 93072 && $codePoint <= 93759)
		 || ($codePoint >= 93851 && $codePoint <= 93951)
		 || ($codePoint >= 94112 && $codePoint <= 94175)
		 || ($codePoint >= 101590 && $codePoint <= 101631)
		 || ($codePoint >= 101641 && $codePoint <= 110591)
		 || ($codePoint >= 110879 && $codePoint <= 110927)
		 || ($codePoint >= 111356 && $codePoint <= 113663)
		 || ($codePoint >= 113828 && $codePoint <= 118783)
		 || ($codePoint >= 119366 && $codePoint <= 119519)
		 || ($codePoint >= 119673 && $codePoint <= 119807)
		 || ($codePoint >= 121520 && $codePoint <= 122879)
		 || ($codePoint >= 122923 && $codePoint <= 123135)
		 || ($codePoint >= 123216 && $codePoint <= 123583)
		 || ($codePoint >= 123648 && $codePoint <= 124927)
		 || ($codePoint >= 125143 && $codePoint <= 125183)
		 || ($codePoint >= 125280 && $codePoint <= 126064)
		 || ($codePoint >= 126133 && $codePoint <= 126208)
		 || ($codePoint >= 126270 && $codePoint <= 126463)
		 || ($codePoint >= 126652 && $codePoint <= 126703)
		 || ($codePoint >= 126706 && $codePoint <= 126975)
		 || ($codePoint >= 127406 && $codePoint <= 127461)
		 || ($codePoint >= 127590 && $codePoint <= 127743)
		 || ($codePoint >= 129202 && $codePoint <= 129279)
		 || ($codePoint >= 129751 && $codePoint <= 129791)
		 || ($codePoint >= 129995 && $codePoint <= 130031)
		 || ($codePoint >= 130042 && $codePoint <= 131069)
		 || ($codePoint >= 173790 && $codePoint <= 173823)
		 || ($codePoint >= 191457 && $codePoint <= 194559)
		 || ($codePoint >= 195102 && $codePoint <= 196605)
		 || ($codePoint >= 201547 && $codePoint <= 262141)
		 || ($codePoint >= 262144 && $codePoint <= 327677)
		 || ($codePoint >= 327680 && $codePoint <= 393213)
		 || ($codePoint >= 393216 && $codePoint <= 458749)
		 || ($codePoint >= 458752 && $codePoint <= 524285)
		 || ($codePoint >= 524288 && $codePoint <= 589821)
		 || ($codePoint >= 589824 && $codePoint <= 655357)
		 || ($codePoint >= 655360 && $codePoint <= 720893)
		 || ($codePoint >= 720896 && $codePoint <= 786429)
		 || ($codePoint >= 786432 && $codePoint <= 851965)
		 || ($codePoint >= 851968 && $codePoint <= 917501)
		 || ($codePoint >= 917536 && $codePoint <= 917631)
		 || ($codePoint >= 917632 && $codePoint <= 917759)
		 || ($codePoint >= 918000 && $codePoint <= 983037)
		 || ($codePoint >= 983040 && $codePoint <= 1048573)
		 || ($codePoint >= 1048576 && $codePoint <= 1114109);
	}

	/**
	 * Normalizer is a PHP fallback implementation of the Normalizer class provided by the intl extension.
	 *
	 * It has been validated with Unicode 6.3 Normalization Conformance Test.
	 * See http://www.unicode.org/reports/tr15/ for detailed info about Unicode normalizations.
	 *
	 * @author Nicolas Grekas <p@tchwork.com>
	 */
	private static
		$C,
		$D,
		$cC;

	private const
		ulenMask = ["\xC0" => 2, "\xD0" => 2, "\xE0" => 3, "\xF0" => 4],
		ASCII = "\x20\x65\x69\x61\x73\x6E\x74\x72\x6F\x6C\x75\x64\x5D\x5B\x63\x6D\x70\x27\x0A\x67\x7C\x68\x76\x2E\x66\x62\x2C\x3A\x3D\x2D\x71\x31\x30\x43\x32\x2A\x79\x78\x29\x28\x4C\x39\x41\x53\x2F\x50\x22\x45\x6A\x4D\x49\x6B\x33\x3E\x35\x54\x3C\x44\x34\x7D\x42\x7B\x38\x46\x77\x52\x36\x37\x55\x47\x4E\x3B\x4A\x7A\x56\x23\x48\x4F\x57\x5F\x26\x21\x4B\x3F\x58\x51\x25\x59\x5C\x09\x5A\x2B\x7E\x5E\x24\x40\x60\x7F\x00\x01\x02\x03\x04\x05\x06\x07\x08\x0B\x0C\x0D\x0E\x0F\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1A\x1B\x1C\x1D\x1E\x1F";

	public static function isNormalized(string $s) : bool
	{
		return self::normalize($s) === $s;
	}

	public static function normalize(string $s)
	{
		if (!isset($s[\strspn($s, self::ASCII)])) {
			return $s;
		}

		if (!\preg_match('//u', $s)) {
			return false;
		}

		if (!\preg_match('/[^\x00-\x{2FF}]/u', $s)) {
			return $s;
		}

		if ('' === $s) {
			return '';
		}

		if (null === self::$D) {
			self::$D = self::getData('canonicalDecomposition');
			self::$cC = self::getData('combiningClass');
		}

		if (null !== $mbEncoding = (2 /* MB_OVERLOAD_STRING */ & (int) \ini_get('mbstring.func_overload')) ? \mb_internal_encoding() : null) {
			\mb_internal_encoding('8bit');
		}

		$r = self::decompose($s);

		if (null === self::$C) {
			self::$C = self::getData('canonicalComposition');
		}

		$r = self::recompose($r);

		if (null !== $mbEncoding) {
			\mb_internal_encoding($mbEncoding);
		}

		return $r;
	}

	private static function recompose($s)
	{
		$result = $tail = '';

		$i = $s[0] < "\x80" ? 1 : static::ulenMask[$s[0] & "\xF0"];
		$len = \strlen($s);

		$lastUchr = \substr($s, 0, $i);
		$lastUcls = isset(static::$cC[$lastUchr]) ? 256 : 0;

		while ($i < $len) {
			if ($s[$i] < "\x80") {
				// ASCII chars

				if ($tail) {
					$lastUchr .= $tail;
					$tail = '';
				}

				if ($j = \strspn($s, self::ASCII, $i + 1)) {
					$lastUchr .= \substr($s, $i, $j);
					$i += $j;
				}

				$result .= $lastUchr;
				$lastUchr = $s[$i];
				$lastUcls = 0;
				++$i;
				continue;
			}

			$ulen = static::ulenMask[$s[$i] & "\xF0"];
			$uchr = \substr($s, $i, $ulen);

			if ($lastUchr < "\xE1\x84\x80" || "\xE1\x84\x92" < $lastUchr
				|| $uchr < "\xE1\x85\xA1" || "\xE1\x85\xB5" < $uchr
				|| $lastUcls) {
				// Table lookup and combining chars composition

				$ucls = static::$cC[$uchr] ?? 0;

				if (isset(static::$C[$lastUchr.$uchr]) && (!$lastUcls || $lastUcls < $ucls)) {
					$lastUchr = static::$C[$lastUchr.$uchr];
				} elseif ($lastUcls = $ucls) {
					$tail .= $uchr;
				} else {
					if ($tail) {
						$lastUchr .= $tail;
						$tail = '';
					}

					$result .= $lastUchr;
					$lastUchr = $uchr;
				}
			} else {
				// Hangul chars

				$L = \ord($lastUchr[2]) - 0x80;
				$V = \ord($uchr[2]) - 0xA1;
				$T = 0;

				$uchr = \substr($s, $i + $ulen, 3);

				if ("\xE1\x86\xA7" <= $uchr && $uchr <= "\xE1\x87\x82") {
					$T = \ord($uchr[2]) - 0xA7;
					0 > $T && $T += 0x40;
					$ulen += 3;
				}

				$L = 0xAC00 + ($L * 21 + $V) * 28 + $T;
				$lastUchr = \chr(0xE0 | $L >> 12).\chr(0x80 | $L >> 6 & 0x3F).\chr(0x80 | $L & 0x3F);
			}

			$i += $ulen;
		}

		return $result.$lastUchr.$tail;
	}

	private static function decompose($s)
	{
		$result = '';

		$c = [];
		$i = 0;
		$len = \strlen($s);

		while ($i < $len) {
			if ($s[$i] < "\x80") {
				// ASCII chars

				if ($c) {
					\ksort($c);
					$result .= \implode('', $c);
					$c = [];
				}

				$j = 1 + \strspn($s, self::ASCII, $i + 1);
				$result .= \substr($s, $i, $j);
				$i += $j;
				continue;
			}

			$ulen = static::ulenMask[$s[$i] & "\xF0"];
			$uchr = \substr($s, $i, $ulen);
			$i += $ulen;

			if ($uchr < "\xEA\xB0\x80" || "\xED\x9E\xA3" < $uchr) {
				// Table lookup

				if ($uchr !== $j = (static::$D[$uchr] ?? $uchr)) {
					$uchr = $j;

					$j = \strlen($uchr);
					$ulen = $uchr[0] < "\x80" ? 1 : static::ulenMask[$uchr[0] & "\xF0"];

					if ($ulen != $j) {
						// Put trailing chars in $s

						$j -= $ulen;
						$i -= $j;

						if (0 > $i) {
							$s = \str_repeat(' ', -$i).$s;
							$len -= $i;
							$i = 0;
						}

						while ($j--) {
							$s[$i + $j] = $uchr[$ulen + $j];
						}

						$uchr = \substr($uchr, 0, $ulen);
					}
				}
				if (isset(static::$cC[$uchr])) {
					// Combining chars, for sorting

					if (!isset($c[static::$cC[$uchr]])) {
						$c[static::$cC[$uchr]] = '';
					}
					$c[static::$cC[$uchr]] .= $uchr;
					continue;
				}
			} else {
				// Hangul chars

				$uchr = \unpack('C*', $uchr);
				$j = (($uchr[1] - 224) << 12) + (($uchr[2] - 128) << 6) + $uchr[3] - 0xAC80;

				$uchr = "\xE1\x84".\chr(0x80 + (int) ($j / 588))
					   ."\xE1\x85".\chr(0xA1 + (int) (($j % 588) / 28));

				if ($j %= 28) {
					$uchr .= $j < 25
						? ("\xE1\x86".\chr(0xA7 + $j))
						: ("\xE1\x87".\chr(0x67 + $j));
				}
			}
			if ($c) {
				\ksort($c);
				$result .= \implode('', $c);
				$c = [];
			}

			$result .= $uchr;
		}

		if ($c) {
			\ksort($c);
			$result .= \implode('', $c);
		}

		return $result;
	}

	private static function getData($file)
	{
		if (\file_exists($file = __DIR__ . '/unidata/'.$file.'.php')) {
			return require $file;
		}

		return false;
	}
}