/*!
 * jQuery UI Effects Drop - v1.10.4
 * http://jqueryui.com
 *
 * Copyright 2014 jQuery Foundation and other contributors
 * Released under the MIT license.
 * http://jquery.org/license
 *
 * http://api.jqueryui.com/drop-effect/
 */

define([
    'jquery',
    'jquery-ui-modules/effect'
], function ($, undefined) {

    $.effects.effect.drop = function (o, done) {

        var el = $(this),
            props = ["position", "top", "bottom", "left", "right", "opacity", "height", "width"],
            mode = $.effects.setMode(el, o.mode || "hide"),
            show = mode === "show",
            direction = o.direction || "left",
            ref = (direction === "up" || direction === "down") ? "top" : "left",
            motion = (direction === "up" || direction === "left") ? "pos" : "neg",
            animation = {
                opacity: show ? 1 : 0
            },
            distance;

        // Adjust
        $.effects.save(el, props);
        el.show();
        $.effects.createWrapper(el);

        distance = o.distance || el[ref === "top" ? "outerHeight" : "outerWidth"](true) / 2;

        if (show) {
            el
                .css("opacity", 0)
                .css(ref, motion === "pos" ? -distance : distance);
        }

        // Animation
        animation[ref] = (show ?
            (motion === "pos" ? "+=" : "-=") :
            (motion === "pos" ? "-=" : "+=")) +
            distance;

        // Animate
        el.animate(animation, {
            queue: false,
            duration: o.duration,
            easing: o.easing,
            complete: function () {
                if (mode === "hide") {
                    el.hide();
                }
                $.effects.restore(el, props);
                $.effects.removeWrapper(el);
                done();
            }
        });
    };

});