/*! UIkit 2.27.2 | www.getuikit.com | © 2014 YOOtheme | MIT License */ /*

* Based on Nestable jQuery Plugin - Copyright (c) 2012 David Bushell - http://dbushell.com/
*/

(function(addon) {

var component;

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

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

})(function(UI) {

"use strict";

var hasTouch     = 'ontouchstart' in window,
    html         = UI.$html,
    touchedlists = [],
    $win         = UI.$win,
    draggingElement;

var eStart  = hasTouch ? 'touchstart'  : 'mousedown',
    eMove   = hasTouch ? 'touchmove'   : 'mousemove',
    eEnd    = hasTouch ? 'touchend'    : 'mouseup',
    eCancel = hasTouch ? 'touchcancel' : 'mouseup';

UI.component('nestable', {

    defaults: {
        listBaseClass   : 'uk-nestable',
        listClass       : 'uk-nestable-list',
        listItemClass   : 'uk-nestable-item',
        dragClass       : 'uk-nestable-dragged',
        movingClass     : 'uk-nestable-moving',
        noChildrenClass : 'uk-nestable-nochildren',
        emptyClass      : 'uk-nestable-empty',
        handleClass     : '',
        collapsedClass  : 'uk-collapsed',
        placeholderClass: 'uk-nestable-placeholder',
        noDragClass     : 'uk-nestable-nodrag',
        group           : false,
        maxDepth        : 10,
        threshold       : 20,
        idlethreshold   : 10,
    },

    boot: function() {

        // adjust document scrolling
        UI.$html.on('mousemove touchmove', function(e) {

            if (draggingElement) {

                var top = draggingElement.offset().top;

                if (top < UI.$win.scrollTop()) {
                    UI.$win.scrollTop(UI.$win.scrollTop() - Math.ceil(draggingElement.height()/2));
                } else if ( (top + draggingElement.height()) > (window.innerHeight + UI.$win.scrollTop()) ) {
                    UI.$win.scrollTop(UI.$win.scrollTop() + Math.ceil(draggingElement.height()/2));
                }
            }
        });

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

            UI.$("[data-uk-nestable]", context).each(function(){

                var ele = UI.$(this);

                if (!ele.data("nestable")) {
                    UI.nestable(ele, UI.Utils.options(ele.attr("data-uk-nestable")));
                }
            });
        });
    },

    init: function() {

        var $this = this;

        Object.keys(this.options).forEach(function(key){

            if(String(key).indexOf('Class')!=-1) {
                $this.options['_'+key] = '.' + $this.options[key];
            }
        });

        this.find(this.options._listItemClass).find(">ul").addClass(this.options.listClass);

        this.checkEmptyList();

        this.reset();
        this.element.data('nestable-group', this.options.group || UI.Utils.uid('nestable-group'));

        this.find(this.options._listItemClass).each(function() {
            $this.setParent(UI.$(this));
        });

        this.on('click', '[data-nestable-action]', function(e) {

            if ($this.dragEl || (!hasTouch && e.button !== 0)) {
                return;
            }

            e.preventDefault();

            var target = UI.$(e.currentTarget),
                action = target.data('nestableAction'),
                item   = target.closest($this.options._listItemClass);

            if (action === 'collapse') {
                $this.collapseItem(item);
            }
            if (action === 'expand') {
                $this.expandItem(item);
            }
            if (action === 'toggle') {
                $this.toggleItem(item);
            }
        });

        var onStartEvent = function(e) {

            var handle = UI.$(e.target),
                link   = handle.is('a[href]') ? handle:handle.parents('a[href]');

            if (e.target === $this.element[0]) {
                return;
            }

            if (handle.is($this.options._noDragClass) || handle.closest($this.options._noDragClass).length) {
                return;
            }

            if (handle.is('[data-nestable-action]') || handle.closest('[data-nestable-action]').length) {
                return;
            }

            if ($this.options.handleClass && !handle.hasClass($this.options.handleClass)) {

                if ($this.options.handleClass) {
                    handle = handle.closest($this.options._handleClass);
                }
            }

            if (!handle.length || $this.dragEl || (!hasTouch && e.button !== 0) || (hasTouch && e.touches.length !== 1)) {
                return;
            }

            if (e.originalEvent && e.originalEvent.touches) {
                e = evt.originalEvent.touches[0];
            }

            $this.delayMove = function(evt) {

                link = false;

                evt.preventDefault();
                $this.dragStart(e);
                $this.trigger('start.uk.nestable', [$this]);

                $this.delayMove = false;
            };

            $this.delayMove.x         = parseInt(e.pageX, 10);
            $this.delayMove.y         = parseInt(e.pageY, 10);
            $this.delayMove.threshold = $this.options.idlethreshold;

            if (link.length && eEnd == 'touchend') {

                $this.one(eEnd, function(){
                    if (link && link.attr('href').trim()) {
                        location.href = link.attr('href');
                    }
                });
            }

            e.preventDefault();
        };

        var onMoveEvent = function(e) {

            if (e.originalEvent && e.originalEvent.touches) {
                e = e.originalEvent.touches[0];
            }

            if ($this.delayMove && (Math.abs(e.pageX - $this.delayMove.x) > $this.delayMove.threshold || Math.abs(e.pageY - $this.delayMove.y) > $this.delayMove.threshold)) {

                if (!window.getSelection().toString()) {
                    $this.delayMove(e);
                } else {
                    $this.delayMove = false;
                }
            }

            if ($this.dragEl) {
                e.preventDefault();
                $this.dragMove(e);
                $this.trigger('move.uk.nestable', [$this]);
            }
        };

        var onEndEvent = function(e) {

            if ($this.dragEl) {
                e.preventDefault();
                $this.dragStop(hasTouch ? e.touches[0] : e);
            }

            draggingElement = false;
            $this.delayMove = false;
        };

        if (hasTouch) {
            this.element[0].addEventListener(eStart, onStartEvent, false);
            window.addEventListener(eMove, onMoveEvent, false);
            window.addEventListener(eEnd, onEndEvent, false);
            window.addEventListener(eCancel, onEndEvent, false);
        } else {
            this.on(eStart, onStartEvent);
            $win.on(eMove, onMoveEvent);
            $win.on(eEnd, onEndEvent);
        }

    },

    serialize: function() {

        var data,
            depth = 0,
            list  = this,
            step  = function(level, depth) {

                var array = [ ], items = level.children(list.options._listItemClass);

                items.each(function() {

                    var li    = UI.$(this),
                        item  = {}, attribute,
                        sub   = li.children(list.options._listClass);

                    for (var i = 0, attr, val; i < li[0].attributes.length; i++) {
                        attribute = li[0].attributes[i];
                        if (attribute.name.indexOf('data-') === 0) {
                            attr       = attribute.name.substr(5);
                            val        =  UI.Utils.str2json(attribute.value);
                            item[attr] = (val || attribute.value=='false' || attribute.value=='0') ? val:attribute.value;
                        }
                    }

                    if (sub.length) {
                        item.children = step(sub, depth + 1);
                    }

                    array.push(item);

                });
                return array;
            };

        data = step(list.element, depth);

        return data;
    },

    list: function(options) {

        var data  = [],
            list  = this,
            depth = 0,
            step  = function(level, depth, parent) {

                var items = level.children(options._listItemClass);

                items.each(function(index) {
                    var li   = UI.$(this),
                        item = UI.$.extend({parent_id: (parent ? parent : null), depth: depth, order: index}, li.data()),
                        sub  = li.children(options._listClass);

                    data.push(item);

                    if (sub.length) {
                        step(sub, depth + 1, li.data(options.idProperty || 'id'));
                    }
                });
            };

        options = UI.$.extend({}, list.options, options);

        step(list.element, depth);

        return data;
    },

    reset: function() {

        this.mouse = {
            offsetX   : 0,
            offsetY   : 0,
            startX    : 0,
            startY    : 0,
            lastX     : 0,
            lastY     : 0,
            nowX      : 0,
            nowY      : 0,
            distX     : 0,
            distY     : 0,
            dirAx     : 0,
            dirX      : 0,
            dirY      : 0,
            lastDirX  : 0,
            lastDirY  : 0,
            distAxX   : 0,
            distAxY   : 0
        };
        this.moving     = false;
        this.dragEl     = null;
        this.dragRootEl = null;
        this.dragDepth  = 0;
        this.hasNewRoot = false;
        this.pointEl    = null;

        for (var i=0; i<touchedlists.length; i++) {
            this.checkEmptyList(touchedlists[i]);
        }

        touchedlists = [];
    },

    toggleItem: function(li) {
        this[li.hasClass(this.options.collapsedClass) ? 'expandItem':'collapseItem'](li);
    },

    expandItem: function(li) {
        li.removeClass(this.options.collapsedClass);
    },

    collapseItem: function(li) {
        var lists = li.children(this.options._listClass);
        if (lists.length) {
            li.addClass(this.options.collapsedClass);
        }
    },

    expandAll: function() {
        var list = this;
        this.find(list.options._listItemClass).each(function() {
            list.expandItem(UI.$(this));
        });
    },

    collapseAll: function() {
        var list = this;
        this.find(list.options._listItemClass).each(function() {
            list.collapseItem(UI.$(this));
        });
    },

    setParent: function(li) {

        if (li.children(this.options._listClass).length) {
            li.addClass('uk-parent');
        }
    },

    unsetParent: function(li) {
        li.removeClass('uk-parent '+this.options.collapsedClass);
        li.children(this.options._listClass).remove();
    },

    dragStart: function(e) {

        var mouse    = this.mouse,
            target   = UI.$(e.target),
            dragItem = target.closest(this.options._listItemClass),
            offset   = dragItem.offset();

        this.placeEl = dragItem;

        mouse.offsetX = e.pageX - offset.left;
        mouse.offsetY = e.pageY - offset.top;

        mouse.startX = mouse.lastX = offset.left;
        mouse.startY = mouse.lastY = offset.top;

        this.dragRootEl = this.element;

        this.dragEl = UI.$('<ul></ul>').addClass(this.options.listClass + ' ' + this.options.dragClass).append(dragItem.clone());
        this.dragEl.css('width', dragItem.width());
        this.placeEl.addClass(this.options.placeholderClass);

        draggingElement = this.dragEl;

        this.tmpDragOnSiblings = [dragItem[0].previousSibling, dragItem[0].nextSibling];

        UI.$body.append(this.dragEl);

        this.dragEl.css({
            left : offset.left,
            top  : offset.top
        });

        // total depth of dragging item
        var i, depth, items = this.dragEl.find(this.options._listItemClass);

        for (i = 0; i < items.length; i++) {
            depth = UI.$(items[i]).parents(this.options._listClass+','+this.options._listBaseClass).length;
            if (depth > this.dragDepth) {
                this.dragDepth = depth;
            }
        }

        html.addClass(this.options.movingClass);
    },

    dragStop: function(e) {

        var el       = UI.$(this.placeEl),
            root     = this.placeEl.parents(this.options._listBaseClass+':first');

        this.placeEl.removeClass(this.options.placeholderClass);
        this.dragEl.remove();

        if (this.element[0] !== root[0]) {

            root.trigger('change.uk.nestable',[root.data('nestable'), el, 'added']);
            this.element.trigger('change.uk.nestable', [this, el, 'removed']);

        } else {
            this.element.trigger('change.uk.nestable',[this, el, "moved"]);
        }

        this.trigger('stop.uk.nestable', [this, el]);

        this.reset();

        html.removeClass(this.options.movingClass);
    },

    dragMove: function(e) {
        var list, parent, prev, next, depth,
            opt      = this.options,
            mouse    = this.mouse,
            maxDepth = this.dragRootEl ? this.dragRootEl.data('nestable').options.maxDepth : opt.maxDepth;

        this.dragEl.css({
            left : e.pageX - mouse.offsetX,
            top  : e.pageY - mouse.offsetY
        });

        // mouse position last events
        mouse.lastX = mouse.nowX;
        mouse.lastY = mouse.nowY;
        // mouse position this events
        mouse.nowX  = e.pageX;
        mouse.nowY  = e.pageY;
        // distance mouse moved between events
        mouse.distX = mouse.nowX - mouse.lastX;
        mouse.distY = mouse.nowY - mouse.lastY;
        // direction mouse was moving
        mouse.lastDirX = mouse.dirX;
        mouse.lastDirY = mouse.dirY;
        // direction mouse is now moving (on both axis)
        mouse.dirX = mouse.distX === 0 ? 0 : mouse.distX > 0 ? 1 : -1;
        mouse.dirY = mouse.distY === 0 ? 0 : mouse.distY > 0 ? 1 : -1;
        // axis mouse is now moving on
        var newAx   = Math.abs(mouse.distX) > Math.abs(mouse.distY) ? 1 : 0;

        // do nothing on first move
        if (!mouse.moving) {
            mouse.dirAx  = newAx;
            mouse.moving = true;
            return;
        }

        // calc distance moved on this axis (and direction)
        if (mouse.dirAx !== newAx) {
            mouse.distAxX = 0;
            mouse.distAxY = 0;
        } else {
            mouse.distAxX += Math.abs(mouse.distX);
            if (mouse.dirX !== 0 && mouse.dirX !== mouse.lastDirX) {
                mouse.distAxX = 0;
            }
            mouse.distAxY += Math.abs(mouse.distY);
            if (mouse.dirY !== 0 && mouse.dirY !== mouse.lastDirY) {
                mouse.distAxY = 0;
            }
        }
        mouse.dirAx = newAx;

        /**
         * move horizontal
         */
        if (mouse.dirAx && mouse.distAxX >= opt.threshold) {
            // reset move distance on x-axis for new phase
            mouse.distAxX = 0;
            prev = this.placeEl.prev('li');

            // increase horizontal level if previous sibling exists, is not collapsed, and does not have a 'no children' class
            if (mouse.distX > 0 && prev.length && !prev.hasClass(opt.collapsedClass) && !prev.hasClass(opt.noChildrenClass)) {

                // cannot increase level when item above is collapsed
                list = prev.find(opt._listClass).last();

                // check if depth limit has reached
                depth = this.placeEl.parents(opt._listClass+','+opt._listBaseClass).length;

                if (depth + this.dragDepth <= maxDepth) {

                    // create new sub-level if one doesn't exist
                    if (!list.length) {
                        list = UI.$('<ul/>').addClass(opt.listClass);
                        list.append(this.placeEl);
                        prev.append(list);
                        this.setParent(prev);
                    } else {
                        // else append to next level up
                        list = prev.children(opt._listClass).last();
                        list.append(this.placeEl);
                    }
                }
            }

            // decrease horizontal level
            if (mouse.distX < 0) {

                // we cannot decrease the level if an item precedes the current one
                next = this.placeEl.next(opt._listItemClass);
                if (!next.length) {

                    // get parent ul of the list item
                    var parentUl = this.placeEl.closest([opt._listBaseClass, opt._listClass].join(','));
                    // try to get the li surrounding the ul
                    var surroundingLi = parentUl.closest(opt._listItemClass);

                    // if the ul is inside of a li (meaning it is nested)
                    if (surroundingLi.length) {
                        // we can decrease the horizontal level
                        surroundingLi.after(this.placeEl);
                        // if the previous parent ul is now empty
                        if (!parentUl.children().length) {
                            this.unsetParent(surroundingLi);
                        }
                    }
                }
            }
        }

        var isEmpty = false;

        // find list item under cursor
        var pointX = e.pageX - (window.pageXOffset || document.scrollLeft || 0),
            pointY = e.pageY - (window.pageYOffset || document.documentElement.scrollTop);
        this.pointEl = UI.$(document.elementFromPoint(pointX, pointY));

        if (opt.handleClass && this.pointEl.hasClass(opt.handleClass)) {

            this.pointEl = this.pointEl.closest(opt._listItemClass);

        } else {

            var nestableitem = this.pointEl.closest(opt._listItemClass);

            if (nestableitem.length) {
                this.pointEl = nestableitem;
            }
        }

        if (this.placeEl.find(this.pointEl).length) {
            return;
        }

        if (this.pointEl.data('nestable') && !this.pointEl.children().length) {
            isEmpty = true;
            this.checkEmptyList(this.pointEl);
        } else if (!this.pointEl.length || !this.pointEl.hasClass(opt.listItemClass)) {
            return;
        }

        // find parent list of item under cursor
        var pointElRoot = this.element,
            tmpRoot     = this.pointEl.closest(this.options._listBaseClass),
            isNewRoot   = pointElRoot[0] != tmpRoot[0];

        /**
         * move vertical
         */
        if (!mouse.dirAx || isNewRoot || isEmpty) {

            // check if groups match if dragging over new root
            if (isNewRoot && opt.group !== tmpRoot.data('nestable-group')) {
                return;
            } else {
                touchedlists.push(pointElRoot);
            }

            // check depth limit
            depth = this.dragDepth - 1 + this.pointEl.parents(opt._listClass+','+opt._listBaseClass).length;

            if (depth > maxDepth) {
                return;
            }

            var before = e.pageY < (this.pointEl.offset().top + this.pointEl.height() / 2);

            parent = this.placeEl.parent();

            if (isEmpty) {
                this.pointEl.append(this.placeEl);
            } else if (before) {
                this.pointEl.before(this.placeEl);
            } else {
                this.pointEl.after(this.placeEl);
            }

            if (!parent.children().length) {
                if (!parent.data('nestable')) this.unsetParent(parent.parent());
            }

            this.checkEmptyList(this.dragRootEl);
            this.checkEmptyList(pointElRoot);

            // parent root list has changed
            if (isNewRoot) {
                this.dragRootEl = tmpRoot;
                this.hasNewRoot = this.element[0] !== this.dragRootEl[0];
            }
        }
    },

    checkEmptyList: function(list) {

        list  = list ? UI.$(list) : this.element;

        if (this.options.emptyClass) {
            list[!list.children().length ? 'addClass':'removeClass'](this.options.emptyClass);
        }
    }

});

return UI.nestable;

});