/*!
 * Nestable jQuery Plugin - Copyright (c) 2012 David Bushell - http://dbushell.com/
 * Dual-licensed under the BSD or MIT licenses
 */
;(function($, window, document, undefined)
{
    var hasTouch = 'ontouchstart' in window;

    /**
     * Detect CSS pointer-events property
     * events are normally disabled on the dragging element to avoid conflicts
     * https://github.com/ausi/Feature-detection-technique-for-pointer-events/blob/master/modernizr-pointerevents.js
     */
    var hasPointerEvents = (function()
    {
        var el    = document.createElement('div'),
            docEl = document.documentElement;
        if (!('pointerEvents' in el.style)) {
            return false;
        }
        el.style.pointerEvents = 'auto';
        el.style.pointerEvents = 'x';
        docEl.appendChild(el);
        var supports = window.getComputedStyle && window.getComputedStyle(el, '').pointerEvents === 'auto';
        docEl.removeChild(el);
        return !!supports;
    })();

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

    var defaults = {
        listNodeName    : 'ol',
        itemNodeName    : 'li',
        rootClass       : 'dd',
        listClass       : 'dd-list',
        itemClass       : 'dd-item',
        dragClass       : 'dd-dragel',
        handleClass     : 'dd-handle',
        collapsedClass  : 'dd-collapsed',
        placeClass      : 'dd-placeholder',
        noDragClass     : 'dd-nodrag',
        emptyClass      : 'dd-empty',
        expandBtnHTML   : '<button data-action="expand" type="button">Expand</button>',
        collapseBtnHTML : '<button data-action="collapse" type="button">Collapse</button>',
        group           : 0,
        maxDepth        : 5,
        threshold       : 20
    };

    defaults = {
        listNodeName    : 'ul',
        itemNodeName    : 'li',
        rootClass       : 'main',
        listClass       : 'dd-list',
        itemClass       : 'node',
        dragClass       : 'dd-dragel',
        handleClass     : 'handle',
        collapsedClass  : 'dd-collapsed',
        placeClass      : 'placeholder',
        noDragClass     : 'dd-nodrag',
        emptyClass      : 'dd-empty',
        expandBtnHTML   : '<a data-action="expand" class="expand expandCollapse">+</a>',
        collapseBtnHTML : '<a data-action="collapse" class="expand expandCollapse">-</a>',
        dragHeight      : '24',
        group           : 0,
        maxDepth        : 99999,
        threshold       : 15
    };

    function Plugin(element, options)
    {
        this.w  = $(window);
        this.el = $(element);
        this.options = $.extend({}, defaults, options);
        this.init();
    }

    Plugin.prototype = {

        init: function()
        {
            var list = this;

            list.reset();

            list.el.data('nestable-group', this.options.group);

            list.placeEl = $('<div class="' + list.options.placeClass + '"/>');

            // $.each(this.el.find(list.options.itemNodeName), function(k, el) {
            //     list.setParent($(el));
            // });

            // list.el.on('click', 'button', function(e) {
            //     if (list.dragEl || (!hasTouch && e.button !== 0)) {
            //         return;
            //     }
            //     var target = $(e.currentTarget),
            //         action = target.data('action'),
            //         item   = target.parent(list.options.itemNodeName);
            //     if (action === 'collapse') {
            //         list.collapseItem(item);
            //     }
            //     if (action === 'expand') {
            //         list.expandItem(item);
            //     }
            // });

            var onStartEvent = function(e)
            {
                var handle = $(e.target);
                if (!handle.hasClass(list.options.handleClass)) {
                    if (handle.closest('.' + list.options.noDragClass).length) {
                        return;
                    }
                    handle = handle.closest('.' + list.options.handleClass);
                }
                if (!handle.length || list.dragEl || (!hasTouch && e.button !== 0) || (hasTouch && e.touches.length !== 1)) {
                    return;
                }
                var myVar = setInterval(function() {
                    clearInterval(myVar);
                    e.preventDefault();
                    list.dragStart(hasTouch ? e.touches[0] : e);
                }, 100);
            };

            var onMoveEvent = function(e)
            {
                if (list.dragEl) {
                    e.preventDefault();
                    list.dragMove(hasTouch ? e.touches[0] : e);
                }
            };

            var onEndEvent = function(e)
            {
                if (list.dragEl) {
                    e.preventDefault();
                    list.dragStop(hasTouch ? e.touches[0] : e);
                }
            };

            if (hasTouch) {
                list.el[0].addEventListener(eStart, onStartEvent, false);
                window.addEventListener(eMove, onMoveEvent, false);
                window.addEventListener(eEnd, onEndEvent, false);
                window.addEventListener(eCancel, onEndEvent, false);
            } else {
                list.el.on(eStart, onStartEvent);
                list.w.on(eMove, onMoveEvent);
                list.w.on(eEnd, onEndEvent);
            }

        },

        serialize: function()
        {
            var data,
                depth = 0,
                list  = this;
                step  = function(level, depth)
                {
                    var array = [ ],
                        items = level.children(list.options.itemNodeName);
                    items.each(function()
                    {
                        var li   = $(this),
                            item = $.extend({}, li.data()),
                            sub  = li.children(list.options.listNodeName);
                        if (sub.length) {
                            item.children = step(sub, depth + 1);
                        }
                        array.push(item);
                    });
                    return array;
                };
            data = step(list.el.find(list.options.listNodeName).first(), depth);
            return data;
        },

        serialise: function()
        {
            return this.serialize();
        },

        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;
        },

        // expandItem: function(li)
        // {
        //     li.removeClass(this.options.collapsedClass);
        //     li.children('[data-action="expand"]').hide();
        //     li.children('[data-action="collapse"]').show();
        //     li.children(this.options.listNodeName).show();
        // },

        // collapseItem: function(li)
        // {
        //     var lists = li.children(this.options.listNodeName);
        //     if (lists.length) {
        //         li.addClass(this.options.collapsedClass);
        //         li.children('[data-action="collapse"]').hide();
        //         li.children('[data-action="expand"]').show();
        //         li.children(this.options.listNodeName).hide();
        //     }
        // },

        // expandAll: function()
        // {
        //     var list = this;
        //     list.el.find(list.options.itemNodeName).each(function() {
        //         list.expandItem($(this));
        //     });
        // },

        // collapseAll: function()
        // {
        //     var list = this;
        //     list.el.find(list.options.itemNodeName).each(function() {
        //         list.collapseItem($(this));
        //     });
        // },

        // setParent: function(li)
        // {
        //     // if this node's children's subLists have any children
        //     if (li.children(this.options.listNodeName).children().length) {
        //         li.prepend($(this.options.expandBtnHTML));
        //         li.prepend($(this.options.collapseBtnHTML));
        //     }
        //     li.children('[data-action="expand"]').hide();
        // },

        // unsetParent: function(li)
        // {
        //     li.removeClass(this.options.collapsedClass);
        //     li.children('[data-action]').remove();
        //     li.children(this.options.listNodeName).remove();
        // },

        dragStart: function(e)
        {
            var mouse    = this.mouse,
                target   = $(e.target),
                dragItem = target.closest(this.options.itemNodeName);

            console.log("mouse");
            console.log(mouse);

            // this.placeEl.css('height', dragItem.height());

            mouse.offsetX = e.offsetX !== undefined ? e.offsetX : e.pageX - target.offset().left;
            mouse.offsetY = e.offsetY !== undefined ? e.offsetY : e.pageY - target.offset().top;
            mouse.startX = mouse.lastX = e.pageX;
            mouse.startY = mouse.lastY = e.pageY;

            console.log("offsetXY");
            console.log(mouse.offsetX + ", " + mouse.offsetY);
            console.log(e.offsetX + ", " + e.offsetY);

            this.dragRootEl = this.el;

            this.dragEl = $(document.createElement(this.options.listNodeName)).addClass(this.options.listClass + ' ' + this.options.dragClass);
            this.dragEl.css('width', dragItem.width());

            // fix for zepto.js
            // dragItem.after(this.placeEl).detach().appendTo(this.dragEl);
            dragItem.after(this.placeEl);
            dragItem[0].parentNode.removeChild(dragItem[0]);
            dragItem.appendTo(this.dragEl);

            $(document.body).append(this.dragEl);
            this.dragEl.css({
                'left' : e.pageX - mouse.offsetX,
                'top'  : e.pageY - mouse.offsetY
            });
            // total depth of dragging item
            // var i, depth,
            //     items = this.dragEl.find(this.options.itemNodeName);
            // for (i = 0; i < items.length; i++) {
            //     depth = $(items[i]).parents(this.options.listNodeName).length;
            //     if (depth > this.dragDepth) {
            //         this.dragDepth = depth;
            //     }
            // }
        },

        dragStop: function(e)
        {
            // fix for zepto.js
            // this.placeEl.replaceWith(this.dragEl.children(this.options.itemNodeName + ':first').detach());
            var el = this.dragEl.children(this.options.itemNodeName).first();
            el[0].parentNode.removeChild(el[0]);
            this.placeEl.replaceWith(el);

            this.dragEl.remove();
            this.el.trigger('change');
            if (this.hasNewRoot) {
                this.dragRootEl.trigger('change');
            }
            this.reset();
            $('.handle').find('img').attr('src', 'img/bullet-8.png');
        },

        dragMove: function(e)
        {
            // $closestNode = $('.node').closestEL({left: e.pageX, top: e.pageY});
            // var offset = $closestNode.children('.content').offset();

            // console.log("node");
            // console.log($closestNode);
            // console.log("rectangle");
            // console.log(offset);

            var list, parent, prev, next, depth,
                opt   = this.options,
                mouse = this.mouse;

            // 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(opt.itemNodeName);
                // increase horizontal level if previous sibling exists and is not collapsed
                if (mouse.distX > 0 && prev.length && !prev.hasClass(opt.collapsedClass)) {
                    // cannot increase level when item above is collapsed
                    list = prev.find(opt.listNodeName).last();
                    // check if depth limit has reached
                    depth = this.placeEl.parents(opt.listNodeName).length;
                    if (depth + this.dragDepth <= opt.maxDepth) {
                        // create new sub-level if one doesn't exist
                        if (!list.length) {
                            list = $('<' + opt.listNodeName + '/>').addClass(opt.listClass);
                            list.append(this.placeEl);
                            prev.append(list);
                            // this.setParent(prev);
                        } else {
                            // else append to next level up
                            list = prev.children(opt.listNodeName).last();
                            list.append(this.placeEl);
                        }
                    }
                }
                // decrease horizontal level
                if (mouse.distX < 0) {
                    // we can't decrease a level if an item preceeds the current one
                    next = this.placeEl.next(opt.itemNodeName);
                    if (!next.length) {
                        parent = this.placeEl.parent();
                        this.placeEl.closest(opt.itemNodeName).after(this.placeEl);
                        // if (!parent.children().length) {
                        //     this.unsetParent(parent.parent());
                        // }
                    }
                }
            }

            var isEmpty = false;

            // find list item under cursor
            if (!hasPointerEvents) {
                this.dragEl[0].style.visibility = 'hidden';
            }
            this.pointEl = $(document.elementFromPoint(e.pageX - document.body.scrollLeft, e.pageY - (window.pageYOffset || document.documentElement.scrollTop)));
            if (!hasPointerEvents) {
                this.dragEl[0].style.visibility = 'visible';
            }
            if (this.pointEl.hasClass(opt.handleClass)) {
                this.pointEl = this.pointEl.parent(opt.itemNodeName);
            }
            if (this.pointEl.hasClass(opt.emptyClass)) {
                isEmpty = true;
            }
            else if (!this.pointEl.length || !this.pointEl.hasClass(opt.itemClass)) {
                return;
            }

            // find parent list of item under cursor
            var pointElRoot = this.pointEl.closest('.' + opt.rootClass),
                isNewRoot   = this.dragRootEl.data('nestable-id') !== pointElRoot.data('nestable-id');

            /**
             * move vertical
             */
            if (!mouse.dirAx || isNewRoot || isEmpty) {
                // check if groups match if dragging over new root
                if (isNewRoot && opt.group !== pointElRoot.data('nestable-group')) {
                    return;
                }
                // check depth limit
                depth = this.dragDepth - 1 + this.pointEl.parents(opt.listNodeName).length;
                if (depth > opt.maxDepth) {
                    return;
                }
                var before = e.pageY < (this.pointEl.offset().top + this.pointEl.height() / 2);
                    parent = this.placeEl.parent();
                // if empty create new list to replace empty placeholder
                if (isEmpty) {
                    list = $(document.createElement(opt.listNodeName)).addClass(opt.listClass);
                    list.append(this.placeEl);
                    this.pointEl.replaceWith(list);
                }
                else if (before) {
                    this.pointEl.before(this.placeEl);
                }
                else {
                    this.pointEl.after(this.placeEl);
                }
                // if (!parent.children().length) {
                //     this.unsetParent(parent.parent());
                // }
                if (!this.dragRootEl.find(opt.itemNodeName).length) {
                    this.dragRootEl.append('<div class="' + opt.emptyClass + '"/>');
                }
                // parent root list has changed
                if (isNewRoot) {
                    this.dragRootEl = pointElRoot;
                    this.hasNewRoot = this.el[0] !== this.dragRootEl[0];
                }
            }
        }

    };

    $.fn.nestable = function(params)
    {
        var lists  = this,
            retval = this;

        lists.each(function()
        {
            var plugin = $(this).data("nestable");

            if (!plugin) {
                $(this).data("nestable", new Plugin(this, params));
                $(this).data("nestable-id", new Date().getTime());
            } else {
                if (typeof params === 'string' && typeof plugin[params] === 'function') {
                    retval = plugin[params]();
                }
            }
        });

        return retval || lists;
    };

    // Helpers
    // $('.myselector').closestEL({left: mouse.x, top: mouse.y});
    $.fn.closestEL = function(offset) {
    var el = null, elOffset, x = offset.left, y = offset.top, distance, dx, dy, minDistance;
    this.each(function() {
        elOffset = $(this).offset();

        if (
        (x >= elOffset.left)  && (x <= elOffset.right) &&
        (y >= elOffset.top)   && (y <= elOffset.bottom)
        ) {
            el = $(this);
            return false;
        }

        var offsets = [[elOffset.left, elOffset.top], [elOffset.right, elOffset.top], [elOffset.left, elOffset.bottom], [elOffset.right, elOffset.bottom]];
        for (off in offsets) {
            dx = offsets[off][0] - x;
            dy = offsets[off][1] - y;
            distance = Math.sqrt((dx*dx) + (dy*dy));
            if (minDistance === undefined || distance < minDistance) {
                minDistance = distance;
                el = $(this);
            }
        }
    });
    return el;
}

})(window.jQuery || window.Zepto, window, document);