rugk / xenforo-threema-gateway

var AutoTriggerer = (function(window, document) {

    'use strict';

    var me = {};

    var indicatorElem = '#threemagw_auto_trigger';

    var period = 2000;

    var expectedError;

    var active;

    var $indicator;

    var $form;

    var $submitUnit;

    var $ajaxProgressWrapper = null;

    /**

     * triggerCheck - triggers a new form check

     *

     * @private

     */

    function triggerCheck() {

        if (!active) {

            return;

        }

        // hide AJAX loading indicator

        hideAjaxLoading();

        // submit form to trigger AJAX request

        $form.submit();

        // reregister timeout

        setTimeout(triggerCheck, period);

    }

    /**

     * errorHandler - handles errors when verifying the 2FA mode

     *

     * @this form, which triggered the error

     * @private

     * @param {object} event jQuery event

     */

    function errorHandler(event) {

        // allow display of AJAX loading indicator again

        showAjaxLoading();

        // only handle error if this is indeed our form

        if (!$form.is(event.target)) { // comparing against this would be possible too

            return;

        }

        var error = event.ajaxData.error;

        // only handle the expected error

        if (error.length !== 1 || error[0] !== expectedError) {

            // when other unexpected error happens, stop whole module

            // so we fall back to the "traditional" input

            me.triggerStop();

            return;

        }

        // apart from logging the event, just ignore it

        console.log('The automatic form submission failed: ' + error);

        // prevent error overlay from appearing

        event.preventDefault();

    }

    /**

     * hideAjaxLoadingInit - wraps ajax loader, so it can be hidden later

     *

     * @private

     */

    function hideAjaxLoadingInit() {

        // unregister myself

        $(document).off('ajaxStart', hideAjaxLoadingInit);

        // wrap loading indicator into div

        $ajaxProgressWrapper = $('#AjaxProgress').wrap('<div></div>').parent();

        // as an immediate measure we need to hide the progress indicator right

        // now as it might otherwise be shown one time

        $('#AjaxProgress').hide();

        // and finally hide

        hideAjaxLoading();

    }

    /**

     * hideAjaxLoading - hides the AJAX loading overlay

     *

     * @private

     */

    function hideAjaxLoading() {

        // let XenForo create element if needed

        if ($ajaxProgressWrapper === null || !$ajaxProgressWrapper.length) {

            // as it is only created when an ajax call starts, we need to wait for it and then wrap the indicator

            $(document).on('ajaxStart', hideAjaxLoadingInit);

        } else {

            $ajaxProgressWrapper.hide();

        }

    }

    /**

     * hideAjaxLoading - shows the AJAX loading overlay

     *

     * @private

     */

    function showAjaxLoading() {

        // ignore this, if element does not exist

        if ($ajaxProgressWrapper === null || !$ajaxProgressWrapper.length) {

            return;

        }

        $ajaxProgressWrapper.show();

    }

    /**

     * init - initialize everything

     */

    me.init = function init() {

        // get indicator

        $indicator = $(indicatorElem);

        // set variables

        $form = $('form.xenForm.AutoValidator');

        $submitUnit = $form.find('.submitUnit .button.primary').parents().eq(1);

        expectedError = $indicator.data('expectederror');

        // hide button/unit as it is useless with autoTriggering enabled

        // replace elements

        $submitUnit.after($indicator);

    };

    /**

     * triggerStart - starts auto triggering and hides the usual input via

     * button

     */

    me.triggerStart = function start() {

        // prevent multiple starts

        if (active) {

            return;

        }

        // if indicator is missing. prevent acivation

        if (!$indicator.length) {

            return;

        }

        // activate the module

        active = true;

        // enable the periodical check

        setTimeout(triggerCheck, period);

        // register/overwrite error handler

        $form.on('AutoValidationError', errorHandler);

        // finally show status & hide button as it is useless now

        $indicator.show();

        $submitUnit.children().hide();

    };

    /**

     * triggerStop - stops auto triggering and offers the usual button input

     * method again

     */

    me.triggerStop = function stop() {

        // prevent next trigger

        active = false;

        // make sure the loading indicator is there again

        showAjaxLoading();

        // unregsiter error handler

        $form.off('AutoValidationError', errorHandler);

        // restore button and hide own indicator

        $indicator.hide();

        $submitUnit.children().show();

    };

    return me;

})(window, document);