/*

 * jQuery UI Sortable

 *

 * Copyright (c) 2008 Paul Bakaus

 * Dual licensed under the MIT (MIT-LICENSE.txt)

 * and GPL (GPL-LICENSE.txt) licenses.

 *

 * http://docs.jquery.com/UI/Sortables

 *

 * Depends:

 *   ui.base.js

 *

 * Revision: $Id: ui.sortable.js 5262 2008-04-17 13:13:51Z paul.bakaus $

 */

;(function($) {

	if (window.Node && Node.prototype && !Node.prototype.contains) {

		Node.prototype.contains = function (arg) {

			return !!(this.compareDocumentPosition(arg) & 16);

		};

	}

	$.widget("ui.sortableTree", $.extend($.ui.mouse, {

		init: function() {

			//Initialize needed constants

			var self = this, o = this.options;

			this.containerCache = {};

			this.element.addClass("ui-sortableTree");

			//Get the items

			this.refresh();

			//Let's determine the parent's offset

			if(!(/(relative|absolute|fixed)/).test(this.element.css('position'))) this.element.css('position', 'relative');

			this.offset = this.element.offset();

			//Initialize mouse events for interaction

			this.mouseInit();

			//Prepare cursorAt

			if(o.cursorAt && o.cursorAt.constructor == Array)

				o.cursorAt = { left: o.cursorAt[0], top: o.cursorAt[1] };

		},

		plugins: {},

		ui: function(inst) {

			return {

				helper: (inst || this)["helper"],

				position: (inst || this)["position"].current,

				absolutePosition: (inst || this)["position"].absolute,

				instance: this,

				options: this.options,

				element: this.element,

				item: (inst || this)["currentItem"],

				sender: inst ? inst.element : null

			};

		},

		propagate: function(n,e,inst) {

			$.ui.plugin.call(this, n, [e, this.ui(inst)]);

			this.element.triggerHandler(n == "sort" ? n : "sort"+n, [e, this.ui(inst)], this.options[n]);

		},

		serialize: function(o) {

			var items = $(this.options.items, this.element).not('.ui-sortableTree-helper'); //Only the items of the sortable itself

			var str = []; o = o || {};

			items.each(function() {

				var res = ($(this).attr(o.attribute || 'id') || '').match(o.expression || (/(.+)[-=_](.+)/));

				if(res) str.push((o.key || res[1])+'[]='+(o.key ? res[1] : res[2]));

			});

			return str.join('&');

		},

		toArray: function(attr) {

			var items = $(this.options.items, this.element).not('.ui-sortableTree-helper'); //Only the items of the sortable itself

			var ret = [];

			items.each(function() { ret.push($(this).attr(attr || 'id')); });

			return ret;

		},

		enable: function() {

			this.element.removeClass("ui-sortableTree-disabled");

			this.options.disabled = false;

		},

		disable: function() {

			this.element.addClass("ui-sortableTree-disabled");

			this.options.disabled = true;

		},

		/* Be careful with the following core functions */

		intersectsWith: function(item) {

			var x1 = this.position.absolute.left - 10, x2 = x1 + 10,

			    y1 = this.position.absolute.top - 10, y2 = y1 + 10;

			var l = item.left, r = l + item.width,

			    t = item.top,  b = t + item.height;

			return (   l < x1 + (this.helperProportions.width  / 2)    // Right Half

				&&     x2 - (this.helperProportions.width  / 2) < r    // Left Half

				&& t < y1 + (this.helperProportions.height / 2)        // Bottom Half

				&&     y2 - (this.helperProportions.height / 2) < b ); // Top Half

		},

		intersectsWithEdge: function(item) {

			var y1 = this.position.absolute.top - 10, y2 = y1 + 10;

			var t = item.top,  b = t + item.height;

			if(!this.intersectsWith(item.item.parents(".ui-sortableTree").data("sortableTree").containerCache)) return false;

			if (!( t < y1 + (this.helperProportions.height / 2)        // Bottom Half

				&&     y2 - (this.helperProportions.height / 2) < b )) return false; // Top Half

			if(y2 > t && y1 < t) return 1; //Crosses top edge

			if(y1 < b && y2 > b) return 2; //Crosses bottom edge

			return false;

		},

		refresh: function() {

			this.refreshItems();

			this.refreshPositions();

		},

		refreshItems: function() {

			this.items = [];

			this.containers = [this];

			var items = this.items;

			var queries = [$(this.options.items, this.element)];

			if(this.options.connectWith) {

				for (var i = this.options.connectWith.length - 1; i >= 0; i--){

					var cur = $(this.options.connectWith[i]);

					for (var j = cur.length - 1; j >= 0; j--){

						var inst = $.data(cur[j], 'sortableTree');

						if(inst && !inst.options.disabled) {

							queries.push($(inst.options.items, inst.element));

							this.containers.push(inst);

						}

					};

				};

			}

			for (var i = queries.length - 1; i >= 0; i--){

				queries[i].each(function() {

					$.data(this, 'sortableTree-item', true); // Data for target checking (mouse manager)

					items.push({

						item: $(this),

						width: 0, height: 0,

						left: 0, top: 0

					});

				});

			};

		},

		refreshPositions: function(fast) {

			for (var i = this.items.length - 1; i >= 0; i--){

				if(!fast) this.items[i].height 			= this.items[i].item.outerHeight();

				this.items[i].top 						= this.items[i].item.offset().top;

			};

			for (var i = this.containers.length - 1; i >= 0; i--){

				var p =this.containers[i].element.offset();

				this.containers[i].containerCache.left 	= p.left;

				this.containers[i].containerCache.top 	= p.top;

				this.containers[i].containerCache.width	= this.containers[i].element.outerWidth();

				this.containers[i].containerCache.height= this.containers[i].element.outerHeight();

			};

		},

		destroy: function() {

			this.element

				.removeClass("ui-sortableTree ui-sortableTree-disabled")

				.removeData("sortableTree")

				.unbind(".sortableTree");

			this.mouseDestroy();

			for ( var i = this.items.length - 1; i >= 0; i-- )

				this.items[i].item.removeData("sortableTree-item");

		},

		contactContainers: function(e) {

			for (var i = this.containers.length - 1; i >= 0; i--){

				if(this.intersectsWith(this.containers[i].containerCache)) {

					if(!this.containers[i].containerCache.over) {

						if(this.currentContainer != this.containers[i]) {

							//When entering a new container, we will find the item with the least distance and append our item near it

							var dist = 10000; var itemWithLeastDistance = null; var base = this.position.absolute.top;

							for (var j = this.items.length - 1; j >= 0; j--) {

								if(!this.containers[i].element[0].contains(this.items[j].item[0])) continue;

								var cur = this.items[j].top;

								if(Math.abs(cur - base) < dist) {

									dist = Math.abs(cur - base); itemWithLeastDistance = this.items[j];

								}

							}

							itemWithLeastDistance ? this.rearrange(e, itemWithLeastDistance) : this.rearrange(e, null, this.containers[i].element);

							this.propagate("change", e); //Call plugins and callbacks

							this.containers[i].propagate("change", e, this); //Call plugins and callbacks

							this.currentContainer = this.containers[i];

						}

						this.containers[i].propagate("over", e, this);

						this.containers[i].containerCache.over = 1;

					}

				} else {

					if(this.containers[i].containerCache.over) {

						this.containers[i].propagate("out", e, this);

						this.containers[i].containerCache.over = 0;

					}

				}

			};

		},

		mouseStart: function(e,el) {

			if(this.options.disabled || this.options.type == 'static') return false;

			//Find out if the clicked node (or one of its parents) is a actual item in this.items

			var currentItem = null, nodes = $(e.target).parents().each(function() {

				if($.data(this, 'sortableTree-item')) {

					currentItem = $(this);

					return false;

				}

			});

			if($.data(e.target, 'sortableTree-item')) currentItem = $(e.target);

			if(!currentItem) return false;

			if(this.options.handle) {

				var validHandle = false;

				$(this.options.handle, currentItem).each(function() { if(this == e.target) validHandle = true; });

				if(!validHandle) return false;

			}

			this.currentItem = currentItem;

			var o = this.options;

			this.currentContainer = this;

			this.refresh();

			//Create and append the visible helper

			this.helper = typeof o.helper == 'function' ? $(o.helper.apply(this.element[0], [e, this.currentItem])) : this.currentItem.clone();

			if(!this.helper.parents('body').length) this.helper.appendTo("body"); //Add the helper to the DOM if that didn't happen already

			this.helper.css({ position: 'absolute', clear: 'both' }).addClass('ui-sortableTree-helper'); //Position it absolutely and add a helper class

			//Prepare variables for position generation

			$.extend(this, {

				offsetParent: this.helper.offsetParent(),

				offsets: { absolute: this.currentItem.offset() }

			});

			//Save the first time position

			$.extend(this, {

				position: {

					current: { left: e.pageX, top: e.pageY },

					absolute: { left: e.pageX, top: e.pageY },

					dom: this.currentItem.prev()[0]

				},

				clickOffset: { left: -5, top: -5 }

			});

			this.propagate("start", e); //Call plugins and callbacks

			this.helperProportions = { width: this.helper.outerWidth(), height: this.helper.outerHeight() }; //Save and store the helper proportions

			for (var i = this.containers.length - 1; i >= 0; i--) {

				this.containers[i].propagate("activate", e, this);

			} //Post 'activate' events to possible containers

			//Prepare possible droppables

			if($.ui.ddmanager) $.ui.ddmanager.current = this;

			if ($.ui.ddmanager && !o.dropBehaviour) $.ui.ddmanager.prepareOffsets(this, e);

			this.dragging = true;

			return true;

		},

		mouseStop: function(e) {

			if(this.newPositionAt) this.options.sortIndication.remove.call(this.currentItem, this.newPositionAt); //remove sort indicator

			this.propagate("stop", e); //Call plugins and trigger callbacks

			//If we are using droppables, inform the manager about the drop

			var dropped = ($.ui.ddmanager && !this.options.dropBehaviour) ? $.ui.ddmanager.drop(this, e) : false;

			if(!dropped && this.newPositionAt) this.newPositionAt[this.direction == 'down' ? 'before' : 'after'](this.currentItem); //Append to element to its new position

			if(this.position.dom != this.currentItem.prev()[0]) this.propagate("update", e); //Trigger update callback if the DOM position has changed

			if(!this.element[0].contains(this.currentItem[0])) { //Node was moved out of the current element

				this.propagate("remove", e);

				for (var i = this.containers.length - 1; i >= 0; i--){

					if(this.containers[i].element[0].contains(this.currentItem[0])) {

						this.containers[i].propagate("update", e, this);

						this.containers[i].propagate("receive", e, this);

					}

				};

			};

			//Post events to containers

			for (var i = this.containers.length - 1; i >= 0; i--){

				this.containers[i].propagate("deactivate", e, this);

				if(this.containers[i].containerCache.over) {

					this.containers[i].propagate("out", e, this);

					this.containers[i].containerCache.over = 0;

				}

			}