/* --------------------------------------------------------------
 link_crypter.js 2016-02-02 
 Gambio GmbH
 http://www.gambio.de
 Copyright (c) 2016 Gambio GmbH
 Released under the GNU General Public License (Version 2)
 [http://www.gnu.org/licenses/gpl-2.0.html]
 --------------------------------------------------------------
 */

/**
 * Widget that replaces the href-attributes of links with the given
 * data if the element gets in focus / hover state. Additionally
 * it is possible to remove every X sign for decryption
 */
gambio.widgets.module('link_crypter', [], function (data) {

    'use strict';

// ########## VARIABLE INITIALIZATION ##########

    var $this = $(this),
        defaults = {
            decrypt: true, // If true, it uses the period option to decrypt the links
            period: 3 // Remove every X sign of the data given for the url
        },
        options = $.extend(true, {}, defaults, data),
        module = {};


// ########## EVENT HANDLER ##########


    /**
     * Function to replace the href value
     * with the URL or a # (depending on
     * the focus / hover state). Additionally
     * it does some decrypting optionally.
     * @param       {object}    e   jQuery-event-object which contains as data the focus state
     * @private
     */
    var _switchUrl = function (e) {
        var $self = $(this),
            url = $(this).parseModuleData('link_crypter').url;

        if (url) {
            if (e.data.in) {
                // Simple decryption functionality. It removes every x. sign inside the URL. 
                // x is given by options.period
                if (options.decrypt) {
                    var decryptedUrl = '';
                    for (var i = 0; i < url.length; i++) {
                        if (i % options.period) {
                            decryptedUrl += url.charAt(i);
                        }
                    }
                    url = decryptedUrl;
                }
                $self.attr('href', url);
            } else {
                $self.attr('href', '#');
            }
            $self.attr('target', '_top');
        }
    };

// ########## INITIALIZATION ##########

    /**
     * Init function of the widget
     * @constructor
     */
    module.init = function (done) {
        $this
            .on('mouseenter focus', 'a', {in: true}, _switchUrl)
            .on('mouseleave blur', 'a', {in: false}, _switchUrl);

        done();
    };

    // Return data to widget engine
    return module;
});