(function () {
    var createApplication = function() {
        var div;
        var location = window.location;
        var parent = location.protocol + '//' + location.host;
        var settings = {
            width: '100%',
            height: '100%',
            frameborder: '0',
            scrolling: 'auto'
        };
        var url = '{{widgetURL}}';
        url = url.replace(new RegExp('([\\?&]parent=)[^&]+'), '$1' + encodeURIComponent(parent));

        div = document.getElementById('{{widgetUrn}}');
        div.setAttribute('id', div.getAttribute('id') + appstore.util.guid());
        appstore.addApplication('{{widgetName}}' + '-' + appstore.util.guid(), div.getAttribute('id'), settings, url);
    };

    var addScriptLoadHandler = function (script, handler) {
        var scriptIsLoaded = false;
        var previousHandler = script.onload;

        // IE8 hack
        script.onload = script.onerror = script.onreadystatechange = function () {
            if (!scriptIsLoaded && (!this.readyState || this.readyState === "loaded" || this.readyState === "complete")) {
                scriptIsLoaded = true;

                if (previousHandler) {
                    previousHandler.call(script);
                }

                handler.call(script);

                // IE8 memory leak fix
                script.onload = script.onerror = script.onreadystatechange = null;
            }
        };
    };
    var createScript = function(callback) {
        var scriptId = 'appstore-container-api';
        var script;

        script = document.getElementById(scriptId);
        if (script) {
            if (window.appstore && window.appstore.apiVersion === 'container') {
                callback();
            } else {
                addScriptLoadHandler(script, function () {
                    callback();
                });
            }
        } else {
            script = document.createElement('script');
            script.src = '{{viewerEndpoint}}/content/js/appsngen.container.api.js';
            script.setAttribute('id', scriptId);
            addScriptLoadHandler(script, function () {
                callback();
            });

            document.body.appendChild(script);
        }
    };
    var container = document.createElement("div");
    container.id = '{{widgetUrn}}';
    document.body.appendChild(container);

    if (window.appstore && window.appstore.apiVersion === 'widget') {
        appstore.ready(createApplication);
    } else if (window.appstore && window.appstore.apiVersion === 'container'){
        createApplication();
    } else {
        createScript(function () {
            if (window.appstore) {
                createApplication();
            } else if (window.console && window.console.error) {
                window.console.error('Cannot render widget: appsngen api loading failure');
            }
        });
    }
}());