/**
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; under version 2
 * of the License (non-upgradable).
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2016-2021 (original work) Open Assessment Technologies SA ;
 */
define(['core/request', 'util/url', 'taoClientDiagnostic/tools/getConfig'], function(request, urlHelper, getConfig) {
    'use strict';

    /**
     * Some default values
     * @type {object}
     * @private
     */
    const defaultConfig = {
        browserVersionAction: 'whichBrowser',
        browserVersionController: 'CompatibilityChecker',
        browserVersionExtension: 'taoClientDiagnostic'
    };

    /**
     * Gets the URL of the platform tester
     * @param {Window} win
     * @param {string} action
     * @param {string} controller
     * @param {string} extension
     * @returns {string}
     * @private
     */
    function getTesterUrl(win, action, controller, extension) {
        const document = win.document;
        const navigator = win.navigator;
        const screen = win.screen;
        const params = {};
        let e = 0;
        let f = 0;

        // append the browser user agent
        params.ua = navigator.userAgent;

        // detect browser family
        e |= win.ActiveXObject ? 1 : 0;
        e |= win.opera ? 2 : 0;
        e |= win.chrome ? 4 : 0;
        e |= 'getBoxObjectFor' in document || 'mozInnerScreenX' in win ? 8 : 0;
        e |=
            'WebKitCSSMatrix' in win || 'WebKitPoint' in win || 'webkitStorageInfo' in win || 'webkitURL' in win
                ? 16
                : 0;
        e |= e & 16 && {}.toString.toString().indexOf('\n') === -1 ? 32 : 0;
        params.e = e;

        // gather info about browser functionality
        f |= 'sandbox' in document.createElement('iframe') ? 1 : 0;
        f |= 'WebSocket' in win ? 2 : 0;
        f |= win.Worker ? 4 : 0;
        f |= win.applicationCache ? 8 : 0;
        f |= win.history && win.history.pushState ? 16 : 0;
        f |= document.documentElement.webkitRequestFullScreen ? 32 : 0;
        f |= 'FileReader' in win ? 64 : 0;
        params.f = f;

        // append a unique ID
        params.r = Math.random()
            .toString(36)
            .substring(7);

        // get the screen size
        params.w = screen.width;
        params.h = screen.height;

        return urlHelper.route(action, controller, extension, params);
    }

    /**
     * Check the user browser and os.
     *
     * This helper performs a server request to gather information about the user browser and os.
     * @param {Window} window - Need an access to the window object
     * @param {object} config
     * @param {string} config.browserVersionAction - The name of the action to call to get the browser checker
     * @param {string} config.browserVersionController - The name of the controller to call to get the browser checker
     * @param {string} config.browserVersionExtension - The name of the extension containing the controller to call to get the browser checker
     * @returns {Promise}
     */
    return function getPlatformInfo(win, config) {
        config = getConfig(config, defaultConfig);

        const url = getTesterUrl(
            win,
            config.browserVersionAction,
            config.browserVersionController,
            config.browserVersionExtension
        );

        return request({ url, noToken: true });
    };
});