/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { Inject, Injectable, PACKAGE_ROOT_URL } from '@angular/core';
import { StringWrapper, isPresent, isBlank, RegExpWrapper } from '../src/facade/lang';
const _ASSET_SCHEME = 'asset:';
/**
 * Create a {@link UrlResolver} with no package prefix.
 */
export function createUrlResolverWithoutPackagePrefix() {
    return new UrlResolver();
}
export function createOfflineCompileUrlResolver() {
    return new UrlResolver(_ASSET_SCHEME);
}
/**
 * A default provider for {@link PACKAGE_ROOT_URL} that maps to '/'.
 */
export var DEFAULT_PACKAGE_URL_PROVIDER = {
    provide: PACKAGE_ROOT_URL,
    useValue: '/'
};
export class UrlResolver {
    constructor(_packagePrefix = null) {
        this._packagePrefix = _packagePrefix;
    }
    /**
     * Resolves the `url` given the `baseUrl`:
     * - when the `url` is null, the `baseUrl` is returned,
     * - if `url` is relative ('path/to/here', './path/to/here'), the resolved url is a combination of
     * `baseUrl` and `url`,
     * - if `url` is absolute (it has a scheme: 'http://', 'https://' or start with '/'), the `url` is
     * returned as is (ignoring the `baseUrl`)
     */
    resolve(baseUrl, url) {
        var resolvedUrl = url;
        if (isPresent(baseUrl) && baseUrl.length > 0) {
            resolvedUrl = _resolveUrl(baseUrl, resolvedUrl);
        }
        var resolvedParts = _split(resolvedUrl);
        var prefix = this._packagePrefix;
        if (isPresent(prefix) && isPresent(resolvedParts) &&
            resolvedParts[_ComponentIndex.Scheme] == 'package') {
            var path = resolvedParts[_ComponentIndex.Path];
            if (this._packagePrefix === _ASSET_SCHEME) {
                var pathSegements = path.split(/\//);
                resolvedUrl = `asset:${pathSegements[0]}/lib/${pathSegements.slice(1).join('/')}`;
            }
            else {
                prefix = StringWrapper.stripRight(prefix, '/');
                path = StringWrapper.stripLeft(path, '/');
                return `${prefix}/${path}`;
            }
        }
        return resolvedUrl;
    }
}
/** @nocollapse */
UrlResolver.decorators = [
    { type: Injectable },
];
/** @nocollapse */
UrlResolver.ctorParameters = [
    { type: undefined, decorators: [{ type: Inject, args: [PACKAGE_ROOT_URL,] },] },
];
/**
 * Extract the scheme of a URL.
 */
export function getUrlScheme(url) {
    var match = _split(url);
    return (match && match[_ComponentIndex.Scheme]) || '';
}
// The code below is adapted from Traceur:
// https://github.com/google/traceur-compiler/blob/9511c1dafa972bf0de1202a8a863bad02f0f95a8/src/runtime/url.js
/**
 * Builds a URI string from already-encoded parts.
 *
 * No encoding is performed.  Any component may be omitted as either null or
 * undefined.
 *
 * @param opt_scheme The scheme such as 'http'.
 * @param opt_userInfo The user name before the '@'.
 * @param opt_domain The domain such as 'www.google.com', already
 *     URI-encoded.
 * @param opt_port The port number.
 * @param opt_path The path, already URI-encoded.  If it is not
 *     empty, it must begin with a slash.
 * @param opt_queryData The URI-encoded query data.
 * @param opt_fragment The URI-encoded fragment identifier.
 * @return The fully combined URI.
 */
function _buildFromEncodedParts(opt_scheme, opt_userInfo, opt_domain, opt_port, opt_path, opt_queryData, opt_fragment) {
    var out = [];
    if (isPresent(opt_scheme)) {
        out.push(opt_scheme + ':');
    }
    if (isPresent(opt_domain)) {
        out.push('//');
        if (isPresent(opt_userInfo)) {
            out.push(opt_userInfo + '@');
        }
        out.push(opt_domain);
        if (isPresent(opt_port)) {
            out.push(':' + opt_port);
        }
    }
    if (isPresent(opt_path)) {
        out.push(opt_path);
    }
    if (isPresent(opt_queryData)) {
        out.push('?' + opt_queryData);
    }
    if (isPresent(opt_fragment)) {
        out.push('#' + opt_fragment);
    }
    return out.join('');
}
/**
 * A regular expression for breaking a URI into its component parts.
 *
 * {@link http://www.gbiv.com/protocols/uri/rfc/rfc3986.html#RFC2234} says
 * As the "first-match-wins" algorithm is identical to the "greedy"
 * disambiguation method used by POSIX regular expressions, it is natural and
 * commonplace to use a regular expression for parsing the potential five
 * components of a URI reference.
 *
 * The following line is the regular expression for breaking-down a
 * well-formed URI reference into its components.
 *
 * <pre>
 * ^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?
 *  12            3  4          5       6  7        8 9
 * </pre>
 *
 * The numbers in the second line above are only to assist readability; they
 * indicate the reference points for each subexpression (i.e., each paired
 * parenthesis). We refer to the value matched for subexpression <n> as $<n>.
 * For example, matching the above expression to
 * <pre>
 *     http://www.ics.uci.edu/pub/ietf/uri/#Related
 * </pre>
 * results in the following subexpression matches:
 * <pre>
 *    $1 = http:
 *    $2 = http
 *    $3 = //www.ics.uci.edu
 *    $4 = www.ics.uci.edu
 *    $5 = /pub/ietf/uri/
 *    $6 = <undefined>
 *    $7 = <undefined>
 *    $8 = #Related
 *    $9 = Related
 * </pre>
 * where <undefined> indicates that the component is not present, as is the
 * case for the query component in the above example. Therefore, we can
 * determine the value of the five components as
 * <pre>
 *    scheme    = $2
 *    authority = $4
 *    path      = $5
 *    query     = $7
 *    fragment  = $9
 * </pre>
 *
 * The regular expression has been modified slightly to expose the
 * userInfo, domain, and port separately from the authority.
 * The modified version yields
 * <pre>
 *    $1 = http              scheme
 *    $2 = <undefined>       userInfo -\
 *    $3 = www.ics.uci.edu   domain     | authority
 *    $4 = <undefined>       port     -/
 *    $5 = /pub/ietf/uri/    path
 *    $6 = <undefined>       query without ?
 *    $7 = Related           fragment without #
 * </pre>
 * @type {!RegExp}
 * @internal
 */
var _splitRe = RegExpWrapper.create('^' +
    '(?:' +
    '([^:/?#.]+)' +
    // used by other URL parts such as :,
    // ?, /, #, and .
    ':)?' +
    '(?://' +
    '(?:([^/?#]*)@)?' +
    '([\\w\\d\\-\\u0100-\\uffff.%]*)' +
    // digits, dashes, dots, percent
    // escapes, and unicode characters.
    '(?::([0-9]+))?' +
    ')?' +
    '([^?#]+)?' +
    '(?:\\?([^#]*))?' +
    '(?:#(.*))?' +
    '$');
/**
 * The index of each URI component in the return value of goog.uri.utils.split.
 * @enum {number}
 */
var _ComponentIndex;
(function (_ComponentIndex) {
    _ComponentIndex[_ComponentIndex["Scheme"] = 1] = "Scheme";
    _ComponentIndex[_ComponentIndex["UserInfo"] = 2] = "UserInfo";
    _ComponentIndex[_ComponentIndex["Domain"] = 3] = "Domain";
    _ComponentIndex[_ComponentIndex["Port"] = 4] = "Port";
    _ComponentIndex[_ComponentIndex["Path"] = 5] = "Path";
    _ComponentIndex[_ComponentIndex["QueryData"] = 6] = "QueryData";
    _ComponentIndex[_ComponentIndex["Fragment"] = 7] = "Fragment";
})(_ComponentIndex || (_ComponentIndex = {}));
/**
 * Splits a URI into its component parts.
 *
 * Each component can be accessed via the component indices; for example:
 * <pre>
 * goog.uri.utils.split(someStr)[goog.uri.utils.CompontentIndex.QUERY_DATA];
 * </pre>
 *
 * @param uri The URI string to examine.
 * @return Each component still URI-encoded.
 *     Each component that is present will contain the encoded value, whereas
 *     components that are not present will be undefined or empty, depending
 *     on the browser's regular expression implementation.  Never null, since
 *     arbitrary strings may still look like path names.
 */
function _split(uri) {
    return RegExpWrapper.firstMatch(_splitRe, uri);
}
/**
  * Removes dot segments in given path component, as described in
  * RFC 3986, section 5.2.4.
  *
  * @param path A non-empty path component.
  * @return Path component with removed dot segments.
  */
function _removeDotSegments(path) {
    if (path == '/')
        return '/';
    var leadingSlash = path[0] == '/' ? '/' : '';
    var trailingSlash = path[path.length - 1] === '/' ? '/' : '';
    var segments = path.split('/');
    var out = [];
    var up = 0;
    for (var pos = 0; pos < segments.length; pos++) {
        var segment = segments[pos];
        switch (segment) {
            case '':
            case '.':
                break;
            case '..':
                if (out.length > 0) {
                    out.pop();
                }
                else {
                    up++;
                }
                break;
            default:
                out.push(segment);
        }
    }
    if (leadingSlash == '') {
        while (up-- > 0) {
            out.unshift('..');
        }
        if (out.length === 0)
            out.push('.');
    }
    return leadingSlash + out.join('/') + trailingSlash;
}
/**
 * Takes an array of the parts from split and canonicalizes the path part
 * and then joins all the parts.
 */
function _joinAndCanonicalizePath(parts) {
    var path = parts[_ComponentIndex.Path];
    path = isBlank(path) ? '' : _removeDotSegments(path);
    parts[_ComponentIndex.Path] = path;
    return _buildFromEncodedParts(parts[_ComponentIndex.Scheme], parts[_ComponentIndex.UserInfo], parts[_ComponentIndex.Domain], parts[_ComponentIndex.Port], path, parts[_ComponentIndex.QueryData], parts[_ComponentIndex.Fragment]);
}
/**
 * Resolves a URL.
 * @param base The URL acting as the base URL.
 * @param to The URL to resolve.
 */
function _resolveUrl(base, url) {
    var parts = _split(encodeURI(url));
    var baseParts = _split(base);
    if (isPresent(parts[_ComponentIndex.Scheme])) {
        return _joinAndCanonicalizePath(parts);
    }
    else {
        parts[_ComponentIndex.Scheme] = baseParts[_ComponentIndex.Scheme];
    }
    for (var i = _ComponentIndex.Scheme; i <= _ComponentIndex.Port; i++) {
        if (isBlank(parts[i])) {
            parts[i] = baseParts[i];
        }
    }
    if (parts[_ComponentIndex.Path][0] == '/') {
        return _joinAndCanonicalizePath(parts);
    }
    var path = baseParts[_ComponentIndex.Path];
    if (isBlank(path))
        path = '/';
    var index = path.lastIndexOf('/');
    path = path.substring(0, index + 1) + parts[_ComponentIndex.Path];
    parts[_ComponentIndex.Path] = path;
    return _joinAndCanonicalizePath(parts);
}
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