'use strict';

/* --------------------------------------------------------------
 pageup.js 2016-03-09
 Gambio GmbH
 http://www.gambio.de
 Copyright (c) 2015 Gambio GmbH
 Released under the GNU General Public License (Version 2)
 [http://www.gnu.org/licenses/gpl-2.0.html]
 --------------------------------------------------------------
 */

/**
 * Component that displays a "Page Up" button if the
 * page is not at top position. On click the page
 * scrolls up to top
 */
gambio.widgets.module('pageup', [gambio.source + '/libs/events'], function (data) {

    'use strict';

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

    var $this = $(this),
        $window = $(window),
        visible = false,
        transition = {},
        defaults = {
        top: 200, // Pixel from top needs to be reached before the button gets displayed
        duration: 300, // Animation time to scroll up
        showClass: 'visible' // Class that gets added to show the pageup element (else it will be hidden)
    },
        options = $.extend(true, {}, defaults, data),
        module = {};

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

    /**
     * Event handler for the scroll event.
     * If the current scroll position ist higher
     * than the position given by options.top
     * the button gets displayed.
     * @private
     */
    var _scrollHandler = function _scrollHandler() {
        var show = $window.scrollTop() > options.top;

        if (show && !visible) {
            visible = true;
            transition.open = true;
            $this.trigger(jse.libs.theme.events.TRANSITION(), transition);
        } else if (!show && visible) {
            visible = false;
            transition.open = false;
            $this.trigger(jse.libs.theme.events.TRANSITION(), transition);
        }
    };

    /**
     * Event handler for clicking on the
     * page-up button. It scrolls up the
     * page.
     * @private
     */
    var _clickHandler = function _clickHandler(e) {
        e.preventDefault();
        $('html, body').animate({ scrollTop: '0' }, options.duration);
    };

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


    /**
     * Init function of the widget
     * @constructor
     */
    module.init = function (done) {

        transition.classOpen = options.showClass;

        $window.on('scroll', _scrollHandler);
        $this.on('click', _clickHandler);

        _scrollHandler();

        done();
    };

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