/*
 * jquery.socialshareprivacy.js | 2 Klicks fuer mehr Datenschutz
 *
 * http://www.heise.de/extras/socialshareprivacy/
 * http://www.heise.de/ct/artikel/2-Klicks-fuer-mehr-Datenschutz-1333879.html
 *
 * Copyright (c) 2011 Hilko Holweg, Sebastian Hilbig, Nicolas Heiringhoff, Juergen Schmidt,
 * Heise Zeitschriften Verlag GmbH & Co. KG, http://www.heise.de
 *
 * is released under the MIT License http://www.opensource.org/licenses/mit-license.php
 *
 * Spread the word, link to us if you can.
 */
(function ($) {

    "use strict";

	/*
	 * helper functions
	 */ 

    // abbreviate at last blank before length and add "\u2026" (horizontal ellipsis)
    function abbreviateText(text, length) {
        var abbreviated = decodeURIComponent(text);
        if (abbreviated.length <= length) {
            return text;
        }

        var lastWhitespaceIndex = abbreviated.substring(0, length - 1).lastIndexOf(' ');
        abbreviated = encodeURIComponent(abbreviated.substring(0, lastWhitespaceIndex)) + "\u2026";

        return abbreviated;
    }

    // returns content of <meta name="" content=""> tags or '' if empty/non existant
    function getMeta(name) {
        var metaContent = $('meta[name="' + name + '"]').attr('content');
        return metaContent || '';
    }
    

    // build URI from rel="canonical" or document.location
    function getURI() {
        var uri = document.location.href;
        var canonical = $("link[rel=canonical]").attr("href");

        if (canonical && canonical.length > 0) {
            if (canonical.indexOf("http") < 0) {
                canonical = document.location.protocol + "//" + document.location.host + canonical;
            }
            uri = canonical;
        }

        return uri;
    }


    // extend jquery with our plugin function
    $.fn.socialSharePrivacy = function (settings) {
        var defaults = {
            'services' : {
                'facebook' : {
                    'status'            : 'on',
                    'dummy_img'         : '/bilder/dummy_facebook.png',
                    'txt_info'          : '2 Klicks f&uuml;r mehr Datenschutz: Erst wenn Sie hier klicken, wird der Button aktiv und Sie k&ouml;nnen Ihre Empfehlung an Facebook senden. Schon beim Aktivieren werden Daten an Dritte &uuml;bertragen &ndash; siehe <em>i</em>.',
                    'txt_fb_off'        : '',
                    'txt_fb_on'         : '',
                    'perma_option'      : 'on',
                    'display_name'      : 'Facebook',
                    'referrer_track'    : '',
                    'language'          : 'de_DE',
                    'action'            : 'recommend'
                }, 
            },
            'info_link'         : 'http://www.heise.de/ct/artikel/2-Klicks-fuer-mehr-Datenschutz-1333879.html',
            'txt_help'          : 'Wenn Sie diese Felder durch einen Klick aktivieren, werden Informationen an Facebook in die USA &uuml;bertragen und unter Umst&auml;nden auch dort gespeichert. N&auml;heres erfahren Sie durch einen Klick auf das <em>i</em>.',
            'uri'               : getURI
        };

        // Standardwerte des Plug-Ings mit den vom User angegebenen Optionen ueberschreiben
        var options = $.extend(true, defaults, settings);

        var facebook_on = (options.services.facebook.status === 'on');

        // check if at least one service is "on"
        if (!facebook_on && !twitter_on && !gplus_on) {
            return;
        }


        return this.each(function () {

            $(this).prepend('<ul class="social_share_privacy_area"></ul>');
            var context = $('.social_share_privacy_area', this);

            // canonical uri that will be shared
            var uri = options.uri;
            if (typeof uri === 'function') {
                uri = uri(context);
            }

            //
            // Facebook
            //
            if (facebook_on) {
                var fb_enc_uri = encodeURIComponent(uri + options.services.facebook.referrer_track);
                var fb_code = '<iframe src="http://www.facebook.com/plugins/like.php?locale=' + options.services.facebook.language + '&amp;href=' + fb_enc_uri + '&amp;send=false&amp;layout=button_count&amp;width=120&amp;show_faces=false&amp;action=' + options.services.facebook.action + '&amp;colorscheme=light&amp;font&amp;height=21" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:145px; height:21px;" allowTransparency="true"></iframe>';
                var fb_dummy_btn = '<img src="' + options.services.facebook.dummy_img + '" alt="Facebook &quot;Like&quot;-Dummy" class="fb_like_privacy_dummy" />';

                context.append('<li class="facebook help_info"><span class="info">' + options.services.facebook.txt_info + '</span><span class="switch off">' + options.services.facebook.txt_fb_off + '</span><div class="fb_like dummy_btn">' + fb_dummy_btn + '</div></li>');

                var $container_fb = $('li.facebook', context);

                $('li.facebook div.fb_like img.fb_like_privacy_dummy,li.facebook span.switch', context).live('click', function () {
                    if ($container_fb.find('span.switch').hasClass('off')) {
                        $container_fb.addClass('info_off');
                        $container_fb.find('span.switch').addClass('on').removeClass('off').html(options.services.facebook.txt_fb_on);
                        $container_fb.find('img.fb_like_privacy_dummy').replaceWith(fb_code);
                    } else {
                        $container_fb.removeClass('info_off');
                        $container_fb.find('span.switch').addClass('off').removeClass('on').html(options.services.facebook.txt_fb_off);
                        $container_fb.find('.fb_like').html(fb_dummy_btn);
                    }
                });
            }


        }); // this.each(function ()
    };      // $.fn.socialSharePrivacy = function (settings) {
}(jQuery));