/*! UIkit 2.27.2 | www.getuikit.com | © 2014 YOOtheme | MIT License */ (function(addon) {

var component;

if (window.UIkit) {
    component = addon(UIkit);
}

if (typeof define == 'function' && define.amd) {
    define('uikit-sticky', ['uikit'], function(){
        return component || addon(UIkit);
    });
}

})(function(UI){

"use strict";

var $win         = UI.$win,
    $doc         = UI.$doc,
    sticked      = [],
    direction    = 1;

UI.component('sticky', {

    defaults: {
        top          : 0,
        bottom       : 0,
        animation    : '',
        clsinit      : 'uk-sticky-init',
        clsactive    : 'uk-active',
        clsinactive  : '',
        getWidthFrom : '',
        showup       : false,
        boundary     : false,
        media        : false,
        target       : false,
        disabled     : false
    },

    boot: function() {

        // should be more efficient than using $win.scroll(checkscrollposition):
        UI.$doc.on('scrolling.uk.document', function(e, data) {
            if (!data || !data.dir) return;
            direction = data.dir.y;
            checkscrollposition();
        });

        UI.$win.on('resize orientationchange', UI.Utils.debounce(function() {

            if (!sticked.length) return;

            for (var i = 0; i < sticked.length; i++) {
                sticked[i].reset(true);
                sticked[i].self.computeWrapper();
            }

            checkscrollposition();
        }, 100));

        // init code
        UI.ready(function(context) {

            setTimeout(function(){

                UI.$('[data-uk-sticky]', context).each(function(){

                    var $ele = UI.$(this);

                    if (!$ele.data('sticky')) {
                        UI.sticky($ele, UI.Utils.options($ele.attr('data-uk-sticky')));
                    }
                });

                checkscrollposition();
            }, 0);
        });
    },

    init: function() {

        var boundary = this.options.boundary, boundtoparent;

        this.wrapper = this.element.wrap('<div class="uk-sticky-placeholder"></div>').parent();
        this.computeWrapper();
        this.wrapper.css({
            'margin-top'    : this.element.css('margin-top'),
            'margin-bottom' : this.element.css('margin-bottom'),
            'margin-left'   : this.element.css('margin-left'),
            'margin-right'  : this.element.css('margin-right')
        })
        this.element.css('margin', 0);

        if (boundary) {

            if (boundary === true || boundary[0] === '!') {

                boundary      = boundary === true ? this.wrapper.parent() : this.wrapper.closest(boundary.substr(1));
                boundtoparent = true;

            } else if (typeof boundary === "string") {
                boundary = UI.$(boundary);
            }
        }

        this.sticky = {
            self          : this,
            options       : this.options,
            element       : this.element,
            currentTop    : null,
            wrapper       : this.wrapper,
            init          : false,
            getWidthFrom  : UI.$(this.options.getWidthFrom || this.wrapper),
            boundary      : boundary,
            boundtoparent : boundtoparent,
            top           : 0,
            calcTop       : function() {

                var top = this.options.top;

                // dynamic top parameter
                if (this.options.top && typeof(this.options.top) == 'string') {

                    // e.g. 50vh
                    if (this.options.top.match(/^(-|)(\d+)vh$/)) {
                        top = window.innerHeight * parseInt(this.options.top, 10)/100;
                    // e.g. #elementId, or .class-1,class-2,.class-3 (first found is used)
                    } else {

                        var topElement = UI.$(this.options.top).first();

                        if (topElement.length && topElement.is(':visible')) {
                            top = -1 * ((topElement.offset().top + topElement.outerHeight()) - this.wrapper.offset().top);
                        }
                    }

                }

                this.top = top;
            },

            reset: function(force) {

                this.calcTop();

                var finalize = function() {
                    this.element.css({position:'', top:'', width:'', left:'', margin:'0'});
                    this.element.removeClass([this.options.animation, 'uk-animation-reverse', this.options.clsactive].join(' '));
                    this.element.addClass(this.options.clsinactive);
                    this.element.trigger('inactive.uk.sticky');

                    this.currentTop = null;
                    this.animate    = false;

                }.bind(this);

                if (!force && this.options.animation && UI.support.animation && !UI.Utils.isInView(this.wrapper)) {

                    this.animate = true;

                    this.element.removeClass(this.options.animation).one(UI.support.animation.end, function(){
                        finalize();
                    }).width(); // force redraw

                    this.element.addClass(this.options.animation+' '+'uk-animation-reverse');
                } else {
                    finalize();
                }
            },

            check: function() {

                if (this.options.disabled) {
                    return false;
                }

                if (this.options.media) {

                    switch(typeof(this.options.media)) {
                        case 'number':
                            if (window.innerWidth < this.options.media) {
                                return false;
                            }
                            break;
                        case 'string':
                            if (window.matchMedia && !window.matchMedia(this.options.media).matches) {
                                return false;
                            }
                            break;
                    }
                }

                var scrollTop      = $win.scrollTop(),
                    documentHeight = $doc.height(),
                    dwh            = documentHeight - window.innerHeight,
                    extra          = (scrollTop > dwh) ? dwh - scrollTop : 0,
                    elementTop     = this.wrapper.offset().top,
                    etse           = elementTop - this.top - extra,
                    active         = (scrollTop  >= etse);

                if (active && this.options.showup) {

                    // set inactiv if scrolling down
                    if (direction == 1) {
                        active = false;
                    }

                    // set inactive when wrapper is still in view
                    if (direction == -1 && !this.element.hasClass(this.options.clsactive) && UI.Utils.isInView(this.wrapper)) {
                        active = false;
                    }
                }

                return active;
            }
        };

        this.sticky.calcTop();

        sticked.push(this.sticky);
    },

    update: function() {
        checkscrollposition(this.sticky);
    },

    enable: function() {
        this.options.disabled = false;
        this.update();
    },

    disable: function(force) {
        this.options.disabled = true;
        this.sticky.reset(force);
    },

    computeWrapper: function() {

        this.wrapper.css({
            'height'        : ['absolute','fixed'].indexOf(this.element.css('position')) == -1 ? this.element.outerHeight() : '',
            'float'         : this.element.css('float') != 'none' ? this.element.css('float') : ''
        });

        if (this.element.css('position') == 'fixed') {
            this.element.css({
                width: this.sticky.getWidthFrom.length ? this.sticky.getWidthFrom.width() : this.element.width()
            });
        }
    }
});

function checkscrollposition(direction) {

    var stickies = arguments.length ? arguments : sticked;

    if (!stickies.length || $win.scrollTop() < 0) return;

    var scrollTop       = $win.scrollTop(),
        documentHeight  = $doc.height(),
        windowHeight    = $win.height(),
        dwh             = documentHeight - windowHeight,
        extra           = (scrollTop > dwh) ? dwh - scrollTop : 0,
        newTop, containerBottom, stickyHeight, sticky;

    for (var i = 0; i < stickies.length; i++) {

        sticky = stickies[i];

        if (!sticky.element.is(':visible') || sticky.animate) {
            continue;
        }

        if (!sticky.check()) {

            if (sticky.currentTop !== null) {
                sticky.reset();
            }

        } else {

            if (sticky.top < 0) {
                newTop = 0;
            } else {
                stickyHeight = sticky.element.outerHeight();
                newTop = documentHeight - stickyHeight - sticky.top - sticky.options.bottom - scrollTop - extra;
                newTop = newTop < 0 ? newTop + sticky.top : sticky.top;
            }

            if (sticky.boundary && sticky.boundary.length) {

                var bTop = sticky.boundary.offset().top;

                if (sticky.boundtoparent) {
                    containerBottom = documentHeight - (bTop + sticky.boundary.outerHeight()) + parseInt(sticky.boundary.css('padding-bottom'));
                } else {
                    containerBottom = documentHeight - bTop;
                }

                newTop = (scrollTop + stickyHeight) > (documentHeight - containerBottom - (sticky.top < 0 ? 0 : sticky.top)) ? (documentHeight - containerBottom) - (scrollTop + stickyHeight) : newTop;
            }

            if (sticky.currentTop != newTop) {

                sticky.element.css({
                    position : 'fixed',
                    top      : newTop,
                    width    : sticky.getWidthFrom.length ? sticky.getWidthFrom.width() : sticky.element.width()
                });

                if (!sticky.init) {

                    sticky.element.addClass(sticky.options.clsinit);

                    if (location.hash && scrollTop > 0 && sticky.options.target) {

                        var $target = UI.$(location.hash);

                        if ($target.length) {

                            setTimeout((function($target, sticky){

                                return function() {

                                    sticky.element.width(); // force redraw

                                    var offset       = $target.offset(),
                                        maxoffset    = offset.top + $target.outerHeight(),
                                        stickyOffset = sticky.element.offset(),
                                        stickyHeight = sticky.element.outerHeight(),
                                        stickyMaxOffset = stickyOffset.top + stickyHeight;

                                    if (stickyOffset.top < maxoffset && offset.top < stickyMaxOffset) {
                                        scrollTop = offset.top - stickyHeight - sticky.options.target;
                                        window.scrollTo(0, scrollTop);
                                    }
                                };

                            })($target, sticky), 0);
                        }
                    }
                }

                sticky.element.addClass(sticky.options.clsactive).removeClass(sticky.options.clsinactive);
                sticky.element.trigger('active.uk.sticky');
                sticky.element.css('margin', '');

                if (sticky.options.animation && sticky.init && !UI.Utils.isInView(sticky.wrapper)) {
                    sticky.element.addClass(sticky.options.animation);
                }

                sticky.currentTop = newTop;
            }
        }

        sticky.init = true;
    }
}

return UI.sticky;

});