<?php
namespace GuzzleHttp\Psr7;
use Psr\Http\Message\UriInterface;
/**
 * Provides methods to normalize and compare URIs.
 *
 * @author Tobias Schultze
 *
 * @link https://tools.ietf.org/html/rfc3986#section-6
 */

final class UriNormalizer
{
    /**
     * Default normalizations which only include the ones that preserve semantics.
     *
     * self::CAPITALIZE_PERCENT_ENCODING | self::DECODE_UNRESERVED_CHARACTERS | self::CONVERT_EMPTY_PATH |
     * self::REMOVE_DEFAULT_HOST | self::REMOVE_DEFAULT_PORT | self::REMOVE_DOT_SEGMENTS
     */
    const PRESERVING_NORMALIZATIONS = 63;
    /**
     * All letters within a percent-encoding triplet (e.g., "%3A") are case-insensitive, and should be capitalized.
     *
     * Example: http://example.org/a%c2%b1b → http://example.org/a%C2%B1b
     */
    const CAPITALIZE_PERCENT_ENCODING = 1;
    const DECODE_UNRESERVED_CHARACTERS = 2;
    const CONVERT_EMPTY_PATH = 4;
    const REMOVE_DEFAULT_HOST = 8;
    const REMOVE_DEFAULT_PORT = 16;
    const REMOVE_DOT_SEGMENTS = 32;
    const REMOVE_DUPLICATE_SLASHES = 64;
    const SORT_QUERY_PARAMETERS = 128;
    public static function normalize(UriInterface $uri, $flags = self::PRESERVING_NORMALIZATIONS)
    {
        if ($flags & self::CAPITALIZE_PERCENT_ENCODING) {
            $uri = self::capitalizePercentEncoding($uri);
        }
        if ($flags & self::DECODE_UNRESERVED_CHARACTERS) {
            $uri = self::decodeUnreservedCharacters($uri);
        }
        if ($flags & self::CONVERT_EMPTY_PATH && $uri->getPath() === '' &&
            ($uri->getScheme() === 'http' || $uri->getScheme() === 'https')
        ) {
            $uri = $uri->withPath('/');
        }
        if ($flags & self::REMOVE_DEFAULT_HOST && $uri->getScheme() === 'file' && $uri->getHost() === 'localhost') {
            $uri = $uri->withHost('');
        }
        if ($flags & self::REMOVE_DEFAULT_PORT && $uri->getPort() !== null && Uri::isDefaultPort($uri)) {
            $uri = $uri->withPort(null);
        }
        if ($flags & self::REMOVE_DOT_SEGMENTS && !Uri::isRelativePathReference($uri)) {
            $uri = $uri->withPath(UriResolver::removeDotSegments($uri->getPath()));
        }
        if ($flags & self::REMOVE_DUPLICATE_SLASHES) {
            $uri = $uri->withPath(preg_replace('#//++#', '/', $uri->getPath()));
        }
        if ($flags & self::SORT_QUERY_PARAMETERS && $uri->getQuery() !== '') {
            $queryKeyValues = explode('&', $uri->getQuery());
            sort($queryKeyValues);
            $uri = $uri->withQuery(implode('&', $queryKeyValues));
        }
        return $uri;
    }
    public static function isEquivalent(UriInterface $uri1, UriInterface $uri2, $normalizations = self::PRESERVING_NORMALIZATIONS)
    {
        return (string) self::normalize($uri1, $normalizations) === (string) self::normalize($uri2, $normalizations);
    }
    private static function capitalizePercentEncoding(UriInterface $uri)
    {
        $regex = '/(?:%[A-Fa-f0-9]{2})++/';
        $callback = function (array $match) {
            return strtoupper($match[0]);
        };
        return
            $uri->withPath(
                preg_replace_callback($regex, $callback, $uri->getPath())
            )->withQuery(
                preg_replace_callback($regex, $callback, $uri->getQuery())
            );
    }
    private static function decodeUnreservedCharacters(UriInterface $uri)
    {
        $regex = '/%(?:2D|2E|5F|7E|3[0-9]|[46][1-9A-F]|[57][0-9A])/i';
        $callback = function (array $match) {
            return rawurldecode($match[0]);
        };
        return
            $uri->withPath(
                preg_replace_callback($regex, $callback, $uri->getPath())
            )->withQuery(
                preg_replace_callback($regex, $callback, $uri->getQuery())
            );
    }
    private function __construct()
    {
    }
}