/* 
Copyright (C) 2016 Extend Studio SRL (www.cloud-press.net)
Licensed under the terms of the GPL3 license.
*/
(function($) {

    function debounce(fn, delay) {
        var timer = null;
        return function() {
            var context = this,
                args = arguments;
            clearTimeout(timer);
            timer = setTimeout(function() {
                fn.apply(context, args);
            }, delay);
        };
    }

    var shrinker = {
        "$initialElement": null,
        "$shrinkedElement": null,
        "$shrinkedWrapper": null,
        "canShrink": false,
        "speed": 100,
        "shrinkedElementShowed": false,
        "initializeShrinked": function() {
            shrinker.$initialElement = $('[data-cp-shrink="initial"]');
            shrinker.$shrinkedElement = $('[data-cp-shrink="shrinked"]');
            shrinker.$shrinkedWrapper = $("")


            if (!(shrinker.$initialElement.length && shrinker.$shrinkedElement.length)) {
                console.log('Nothing to shrink');
                return true;
            }
            // $("body").smoothWheel();
            shrinker.canShrink = true;
            if (shrinker.$shrinkedWrapper.length == 0) {
                shrinker.$shrinkedWrapper = $("<div class='cp-shrink-wrapper'></div>");
                $('body').prepend(shrinker.$shrinkedWrapper);
                shrinker.$shrinkedWrapper.append(shrinker.$shrinkedElement);
                shrinker.$shrinkedElement.css({
                    'margin-top': -1 * shrinker.$shrinkedElement.outerHeight() - 5,
                    'display': 'block'
                })
            }
        },
        "scroll": function() {
            if (!shrinker.canShrink) {
                return true;
            }

            var initialY = shrinker.$initialElement.outerHeight();
            var shrinkedY = shrinker.$initialElement.outerHeight() + shrinker.$shrinkedElement.outerHeight();
            var winY = window.scrollY ? window.scrollY : document.documentElement.scrollTop;

            if (winY > initialY) {

                if (shrinker.shrinkedElementShowed) {
                    return;
                }

                shrinker.shrinkedElementShowed = true;

                shrinker.shrinkedElementMoveDown();
            } else if (winY < shrinkedY) {
                if (!shrinker.shrinkedElementShowed) {
                    return;
                }
                shrinker.shrinkedElementShowed = false;
                shrinker.shrinkedElementMoveUP();
            }
        },

        "shrinkedElementMoveDown": function() {
            shrinker.$shrinkedElement.stop();
            shrinker.$shrinkedElement.animate({
                    "margin-top": "0px",
                },
                shrinker.speed,
                function() {

                });
        },
        "shrinkedElementMoveUP": function() {
            shrinker.$shrinkedElement.stop();
            shrinker.$shrinkedElement.animate({
                    "margin-top": (-1 * shrinker.$shrinkedElement.outerHeight() - 5)
                },
                shrinker.speed / 10,
                function() {

                });
        }

    }



    $(document).on("scroll", shrinker.scroll);

    $(document).on("resize", function() {

    });


    jQuery(document).ready(function($) {
        setTimeout(shrinker.initializeShrinked, 500);
    });
})(jQuery)