(function() {

        var jQuery;
        var widgetContainer;

        var jsonp_url  = "http://app.plant-for-the-planet.org/treecounter-widget/widget?callback=?";
        var minRefresh = '30';
        var refresh    = '0';
        var theme      = 'default';
        var mode       = 'default';
        var apiKey     = '';
        var timeOut    = 0;

        /******** Load jQuery if not present *********/
        if (window.jQuery === undefined || window.jQuery.fn.jquery !== '1.4.2') {
            var script_tag = document.createElement('script');
            script_tag.setAttribute("type", "text/javascript");
            script_tag.setAttribute("src", "https://code.jquery.com/jquery-1.11.3.min.js");
            if (script_tag.readyState) {
                script_tag.onreadystatechange = function () { // For old versions of IE
                    if (this.readyState == 'complete' || this.readyState == 'loaded') {
                        scriptLoadHandler();
                    }
                };
            } else {
                script_tag.onload = scriptLoadHandler;
            }
            // Try to find the head, otherwise default to the documentElement
            (document.getElementsByTagName("head")[0] || document.documentElement).appendChild(script_tag);
        } else {
            // The jQuery version on the window is the one we want to use
            jQuery = window.jQuery;
            main();
        }

        /******** Called once jQuery has loaded ******/
        function scriptLoadHandler() {
            // Restore $ and window.jQuery to their previous values and store the
            // new jQuery in our local jQuery variable
            jQuery = window.jQuery.noConflict(true);
            // Call our main function
            main();
        }

        /******** Update tree values ******/
        function updateData() {
            var data = widgetContainer.data();
            data.op     = 'update';
            data.apiKey = apiKey;

            jQuery.getJSON(jsonp_url, data, function(data) {

                jQuery('.contribution .target',    widgetContainer).html(data.target);
                jQuery('.contribution .planted',   widgetContainer).html(data.planted);
                jQuery('.contribution .pledged',   widgetContainer).html(data.pledged);
                jQuery('.contribution .community', widgetContainer).html(data.community);

                if(timeOut > 0) {
                    setTimeout(updateData, timeOut);
                }
            });
        }

        /******** Our main function ********/
        function main() {
            jQuery(document).ready(function($) {

                widgetContainer = $('#pftp-treecounter-widget');
                if(widgetContainer.length == 0) {
                    warning("widget container '#pftp-treecounter-widget' could be found on this page.");
                    return;
                }
                if(widgetContainer.data('api-key') == '') {
                    warning("no api-key data provided in widget container");
                    return;
                }

                if(widgetContainer.data('api-key')) { apiKey  = widgetContainer.data('api-key'); }
                if(widgetContainer.data('refresh')) { refresh = widgetContainer.data('refresh'); }
                if(widgetContainer.data('theme'))   { theme   = widgetContainer.data('theme'); }
                if(widgetContainer.data('mode'))    { mode    = widgetContainer.data('mode'); }

                ///******* Load CSS *******/
                var css_link = $("<link>", {
                    rel: "stylesheet",
                    type: "text/css",
                    href: "https://app.plant-for-the-planet.org/css/widget/themes/" + theme + ".css"
                });
                css_link.appendTo('head');

                if(refresh > 0) {
                    timeOut = Math.max(minRefresh * 1000, refresh * 1000);
                }

                var data = widgetContainer.data();
                data.op     = 'render';
                data.apiKey = apiKey;
                data.theme  = theme;
                data.mode   = mode;

                ///******* Load HTML *******/
                $.getJSON(jsonp_url, data, function(data) {
                    widgetContainer.html(data.html);
                    setTimeout(updateData, timeOut);
                });

                function warning(text)
                {
                    if(console) console.log(text);
                }
            });
        }

    })(); // We call our anonymous function immediately