# Source: streaming/utils/DefaultURLUtils.js

    /**
     * The copyright in this software is being made available under the BSD License,
     * included below. This software may be subject to other third party and contributor
     * rights, including patent rights, and no such rights are granted under this license.
     *
     * Copyright (c) 2013, Dash Industry Forum.
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without modification,
     * are permitted provided that the following conditions are met:
     *  * Redistributions of source code must retain the above copyright notice, this
     *  list of conditions and the following disclaimer.
     *  * Redistributions in binary form must reproduce the above copyright notice,
     *  this list of conditions and the following disclaimer in the documentation and/or
     *  other materials provided with the distribution.
     *  * Neither the name of Dash Industry Forum nor the names of its
     *  contributors may be used to endorse or promote products derived from this software
     *  without specific prior written permission.
     *
     *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
     *  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     *  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     *  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     *  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     *  POSSIBILITY OF SUCH DAMAGE.
     */

    import FactoryMaker from '../../core/FactoryMaker';

    /**
     * @module DefaultURLUtils
     * @description Provides utility functions for operating on URLs.
     * Initially this is simply a method to determine the Base URL of a URL, but
     * should probably include other things provided all over the place such as
     * determining whether a URL is relative/absolute, resolving two paths etc.
     * @ignore
     */
    function DefaultURLUtils() {

        let resolveFunction;

        const schemeRegex = /^[a-z][a-z0-9+\-_.]*:/i;
        const httpUrlRegex = /^https?:\/\//i;
        const httpsUrlRegex = /^https:\/\//i;
        const originRegex = /^([a-z][a-z0-9+\-_.]*:\/\/[^\/]+)\/?/i;

        /**
         * Resolves a url given an optional base url
         * Uses window.URL to do the resolution.
         *
         * @param {string} url
         * @param {string} [baseUrl]
         * @return {string}
         * @memberof module:DefaultURLUtils
         * @instance
         * @private
         */
        const nativeURLResolver = (url, baseUrl) => {
            try {
                return new window.URL(url, baseUrl).toString();
            } catch (e) {
                return url;
            }
        };

        /**
         * Resolves a url given an optional base url
         * Does not resolve ./, ../ etc but will do enough to construct something
         * which will satisfy XHR etc when window.URL is not available ie
         * IE11/node etc.
         *
         * @param {string} url
         * @param {string} [baseUrl]
         * @return {string}
         * @memberof module:DefaultURLUtils
         * @instance
         * @private
         */
        const dumbURLResolver = (url, baseUrl) => {
            let baseUrlParseFunc = parseBaseUrl;

            if (!baseUrl) {
                return url;
            }

            if (!isRelative(url)) {
                return url;
            }

            if (isPathAbsolute(url)) {
                baseUrlParseFunc = parseOrigin;
            }

            if (isSchemeRelative(url)) {
                baseUrlParseFunc = parseScheme;
            }

            const base = baseUrlParseFunc(baseUrl);
            const joinChar =
                base.charAt(base.length - 1) !== '/' &&
                url.charAt(0) !== '/' ?
                    '/' : '';

            return [base, url].join(joinChar);
        };

        function setup() {
            try {
                const u = new window.URL('x', 'http://y'); // eslint-disable-line
                resolveFunction = nativeURLResolver;
            } catch (e) {
                // must be IE11/Node etc
            } finally {
                resolveFunction = resolveFunction || dumbURLResolver;
            }
        }

        /**
         * Returns a string that contains the Base URL of a URL, if determinable.
         * @param {string} url - full url
         * @return {string}
         * @memberof module:DefaultURLUtils
         * @instance
         */
        function parseBaseUrl(url) {
            const slashIndex = url.indexOf('/');
            const lastSlashIndex = url.lastIndexOf('/');

            if (slashIndex !== -1) {
                // if there is only '//'
                if (lastSlashIndex === slashIndex + 1) {
                    return url;
                }

                if (url.indexOf('?') !== -1) {
                    url = url.substring(0, url.indexOf('?'));
                }

                return url.substring(0, lastSlashIndex + 1);
            }

            return '';
        }

        /**
         * Returns a string that contains the scheme and origin of a URL,
         * if determinable.
         * @param {string} url - full url
         * @return {string}
         * @memberof module:DefaultURLUtils
         * @instance
         */
        function parseOrigin(url) {
            const matches = url.match(originRegex);

            if (matches) {
                return matches[1];
            }

            return '';
        }

        /**
         * Returns a string that contains the fragment of a URL without scheme,
         * if determinable.
         * @param {string} url - full url
         * @return {string}
         * @memberof module:DefaultURLUtils
         * @instance
         */
        function removeHostname(url) {
            let urlParts = /^(?:\w+\:\/\/)?([^\/]+)(.*)$/.exec(url); //[1] = host / [2] = path
            return urlParts[2].substring(1);
        }

        /**
         * Returns a string that contains the scheme of a URL, if determinable.
         * @param {string} url - full url
         * @return {string}
         * @memberof module:DefaultURLUtils
         * @instance
         */
        function parseScheme(url) {
            const matches = url.match(schemeRegex);

            if (matches) {
                return matches[0];
            }

            return '';
        }

        /**
         * Determines whether the url is relative.
         * @return {boolean}
         * @param {string} url
         * @memberof module:DefaultURLUtils
         * @instance
         */
        function isRelative(url) {
            return !schemeRegex.test(url);
        }

        /**
         * Determines whether the url is path-absolute.
         * @return {bool}
         * @param {string} url
         * @memberof module:DefaultURLUtils
         * @instance
         */
        function isPathAbsolute(url) {
            return isRelative(url) && url.charAt(0) === '/';
        }

        /**
         * Determines whether the url is scheme-relative.
         * @return {bool}
         * @param {string} url
         * @memberof module:DefaultURLUtils
         * @instance
         */
        function isSchemeRelative(url) {
            return url.indexOf('//') === 0;
        }

        /**
         * Determines whether the url is an HTTP-URL as defined in ISO/IEC
         * 23009-1:2014 3.1.15. ie URL with a fixed scheme of http or https
         * @return {bool}
         * @param {string} url
         * @memberof module:DefaultURLUtils
         * @instance
         */
        function isHTTPURL(url) {
            return httpUrlRegex.test(url);
        }

        /**
         * Determines whether the supplied url has https scheme
         * @return {bool}
         * @param {string} url
         * @memberof module:DefaultURLUtils
         * @instance
         */
        function isHTTPS(url) {
            return httpsUrlRegex.test(url);
        }

        /**
         * Resolves a url given an optional base url
         * @return {string}
         * @param {string} url
         * @param {string} [baseUrl]
         * @memberof module:DefaultURLUtils
         * @instance
         */
        function resolve(url, baseUrl) {
            return resolveFunction(url, baseUrl);
        }

        setup();

        const instance = {
            parseBaseUrl: parseBaseUrl,
            parseOrigin: parseOrigin,
            parseScheme: parseScheme,
            isRelative: isRelative,
            isPathAbsolute: isPathAbsolute,
            isSchemeRelative: isSchemeRelative,
            isHTTPURL: isHTTPURL,
            isHTTPS: isHTTPS,
            removeHostname: removeHostname,
            resolve: resolve
        };

        return instance;
    }

    DefaultURLUtils.__dashjs_factory_name = 'DefaultURLUtils';
    export default FactoryMaker.getSingletonFactory(DefaultURLUtils);

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