/**
 * File: LeftAndMain.Tree.js
 */

(function($) {
	
	$.entwine('ss', function($){
	
		$('.cms-tree').entwine({
			onmatch: function() {
				this._super();
				
				/**
				 * @todo Icon and page type hover support
				 * @todo Sorting of sub nodes (originally placed in context menu)
				 * @todo Refresh after language <select> change (with Translatable enabled)
				 * @todo Automatic load of full subtree via ajax on node checkbox selection (minNodeCount = 0)
				 *  to avoid doing partial selection with "hidden nodes" (unloaded markup)
				 * @todo Add siteTreeHints to field (as "data-hints" attribute with serialized JSON instead of javascript global variable)
				 * @todo Disallow drag'n'drop when node has "noChildren" set (see siteTreeHints)
				 * @todo Disallow moving of pages marked as deleted 
				 *  most likely by server response codes rather than clientside
				 * @todo "defaultChild" when creating a page (sitetreeHints)
				 * @todo Duplicate page (originally located in context menu)
				 * @todo Update tree node title information and modified state after reordering (response is a JSON array)
				 * 
				 * Tasks most likely not required after moving to a standalone tree:
				 * 
				 * @todo Context menu - to be replaced by a bezel UI
				 * @todo Refresh form for selected tree node if affected by reordering (new parent relationship)
				 * @todo Cancel current form load via ajax when new load is requested (synchronous loading)
				 * @todo When new edit form is loaded, automatically: Select matching node, set correct parent,
				 *  update icon and title
				 */
				var self = this;
					this
						.jstree({
							'core': {
								'initially_open': ['record-0'],
								'animation': 0,
								'html_titles': true
							},
							'html_data': {
								// 'ajax' will be set on 'loaded.jstree' event
							},
							'ui': {
								"select_limit" : 1,
								'initially_select': [this.find('.current').attr('id')]
							},
							 "crrm": {
								 'move': {
									// Check if a node is allowed to be moved.
									// Caution: Runs on every drag over a new node
									'check_move': function(data) {
										var movedNode = $(data.o), newParent = $(data.np), 
											isMovedOntoContainer = data.ot.get_container()[0] == data.np[0],
											movedNodeClass = movedNode.getClassname(), 
											newParentClass = newParent.getClassname(),
											// Check allowedChildren of newParent or against root node rules
											allowedChildren = siteTreeHints[newParentClass ? newParentClass : 'Root'].allowedChildren || [];

										var isAllowed = (
											// Don't allow moving the root node
											movedNode.data('id') != 0 
											// Only allow moving node inside the root container, not before/after it
											&& (!isMovedOntoContainer || data.p == 'inside')
											// Children are generally allowed on parent
											&& !newParent.hasClass('nochildren')
											// movedNode is allowed as a child
											&& ($.inArray(movedNodeClass, allowedChildren) != -1)
										);
										
										return isAllowed;
									}
								}
							},
							'dnd': {
								"drop_target" : false,
								"drag_target" : false
							},
							'themes': {
								'theme': 'apple',
								'url': 'sapphire/thirdparty/jstree/themes/apple/style.css'
							},
							// Caution: SilverStripe has disabled $.vakata.css.add_sheet() for performance reasons,
							// which means you need to add any CSS manually to sapphire/admin/scss/_tree.css
							'plugins': [
								'html_data', 'ui', 'dnd', 'crrm', 'themes', 
								'checkbox' // checkboxes are hidden unless .multiple is set
							]
						})
						.bind('loaded.jstree', function(e, data) {
							// Add ajax settings after init period to avoid unnecessary initial ajax load
							// of existing tree in DOM - see load_node_html()
							data.inst._set_settings({'html_data': {'ajax': {
								'url': self.data('url-tree'),
								'data': function(node) {
									var params = self.data('searchparams') || [];
									// Avoid duplication of parameters
									params = $.grep(params, function(n, i) {return (n.name != 'ID' && n.name != 'value');});
									params.push({name: 'ID', value: $(node).data("id") ? $(node).data("id") : 0});
									params.push({name: 'ajax', value: 1});
									return params;
								}
							}}});
							
							// Only show checkboxes with .multiple class
							data.inst.hide_checkboxes();
						})
						.bind('before.jstree', function(e, data) {
							if(data.func == 'start_drag') {
								// Only allow drag'n'drop if it has been specifically enabled, or the tree is in search mode
								if(!$('input[id=sortitems]').is(':checked') || self.data('searchparams')) {
									e.stopImmediatePropagation();
									return false;
								}
							}
							
							if($.inArray(data.func, ['check_node', 'uncheck_node'])) {
								var node = $(data.args[0]).parents('li:first');
								if(node.hasClass('disabled')) {
									e.stopImmediatePropagation();
									return false;
								}
							}
						})
						// TODO Move to EditForm logic
						.bind('select_node.jstree', function(e, data) {
							var node = data.rslt.obj, loadedNodeID = $('.edit-form :input[name=ID]').val()
							
							// Don't allow checking disabled nodes
							if($(node).hasClass('disabled')) return false;

							// Don't allow reloading of currently selected node,
							// mainly to avoid doing an ajax request on initial page load
							if($(node).data('id') == loadedNodeID) return;

							var url = $(node).find('a:first').attr('href');
							if(url && url != '#') {
								var xmlhttp = $('.edit-form').loadForm(
									url,
									function(response) {}
								);
							} else {
								$('.edit-form').removeForm();
							}
						})
						.bind('move_node.jstree', function(e, data) {
							var movedNode = data.rslt.o, newParentNode = data.rslt.np, oldParentNode = data.inst._get_parent(movedNode);
							var siblingIDs = $.map($(movedNode).siblings().andSelf(), function(el) {
								return $(el).data('id');
							});

							$.ajax({
								'url': self.data('url-savetreenode'),
								'data': {
									ID: $(movedNode).data('id'), 
									ParentID: $(newParentNode).data('id') || 0,
									SiblingIDs: siblingIDs
								}
							});
						});
					
					$('.cms-edit-form').bind('loadnewpage', function(e, data) {
						self._onLoadNewPage(e, data);
					});
			},
			
			/**
			 * Function:
			 *  search
			 * 
			 * Parameters:
			 *  (Object) data Pass empty data to cancel search
			 *  (Function) callback Success callback
			 */
			search: function(params, callback) {
				if(params) this.data('searchparams', params);
				else this.removeData('searchparams');
				this.jstree('refresh', -1, callback);
			},
			
			/**
			 * Function: getNodeByID
			 * 
			 * Parameters:
			 *  (Int) id 
			 * 
			 * Returns
			 *  DOMElement
			 */
			getNodeByID: function(id) {
				return this.jstree('get_node', this.find('*[data-id='+id+']'));
			},
			
			/**
		 	 * Assumes to be triggered by a form element with the following input fields:
		 	 * ID, ParentID, TreeTitle (or Title), ClassName
		 	 */
		 	_onLoadNewPage: function(e, eventData) {
				var self = this;
			
		 		// finds a certain value in an array generated by jQuery.serializeArray()
		 		var findInSerializedArray = function(arr, name) {
		 			for(var i=0; i<arr.length; i++) {
		 				if(arr[i].name == name) return arr[i].value;
		 			};
		 			return false;
		 		};

		 		var id = $(e.target.ID).val();

		 		// check if a form with a valid ID exists
		 		if(id) {
		 			var parentID = $(e.target.ParentID).val(), 
						parentNode = this.find('li[data-id='+parentID+']');
						node = this.find('li[data-id='+id+']'),
						title = $((e.target.TreeTitle) ? e.target.TreeTitle : e.target.Title).val(),
						className = $(e.target.ClassName).val();

		 			// set title (either from TreeTitle or from Title fields)
		 			// Treetitle has special HTML formatting to denote the status changes.
		 			if(title) this.jstree('rename_node', node, title);

					// TODO Fix node icon setting
		 			// // update icon (only if it has changed)
		 			// if(className) this.setNodeIcon(id, className);

		 			// check if node exists, might have been created instead
		 			if(!node.length) {
						this.jstree(
							'create_node', 
							parentNode, 
							'inside', 
							{data: '', attr: {'class': className, 'data-id': id}},
							function() {
								var newNode = self.find('li[data-id='+id+']');
								// TODO Fix hardcoded link
								// TODO Fix replacement of jstree-icon inside <a> tag
								newNode.find('a:first').html(title).attr('href', 'admin/show/'+id);
								self.jstree('deselect_node', parentNode);
								self.jstree('select_node', newNode);
							}
						);
						// set current tree element
			 			this.jstree('select_node', node);
		 			}

					// TODO Fix node parent setting
		 			// // set correct parent (only if it has changed)
		 			// if(parentID) this.setNodeParentID(id, jQuery(e.target.ParentID).val());

					// TODO Fix doubleup when replacing page form with root form, reloads the old form over the root
		 			// set current tree element regardless of wether the item was new
		 			// this.jstree('select_node', node);
		 		} else {
		 			if(typeof eventData.origData != 'undefined') {
		 				var node = this.find('li[data-id='+eventData.origData.ID+']');
		 				if(node && node.data('id') != 0) this.jstree('delete_node', node);
		 			}
		 		}

		 	}
		});
	});
	
	$('.cms-tree.multiple').entwine({
		onmatch: function() {
			this._super();
			
			this.jstree('show_checkboxes');
		},
		onunmatch: function() {
			this._super();
			
			this.jstree('hide_checkboxes');
		},
		/**
		 * Function: getSelectedIDs
		 * 
		 * Returns:
		 * 	(Array)
		 */
		getSelectedIDs: function() {
			return $.map($(this).jstree('get_checked'), function(el, i) {return $(el).data('id');});
		}
	});
	
	$('.cms-tree li').entwine({
		
		/**
		 * Function: setEnabled
		 * 
		 * Parameters:
		 * 	(bool)
		 */
		setEnabled: function(bool) {
			this.toggleClass('disabled', !(bool));
		},
		
		/**
		 * Function: getClassname
		 * 
		 * Returns PHP class for this element. Useful to check business rules like valid drag'n'drop targets.
		 */
		getClassname: function() {
			var matches = this.attr('class').match(/class-([^\s]*)/i);
			return matches ? matches[1] : '';
		},
		
		/**
		 * Function: getID
		 * 
		 * Returns:
		 * 	(Number)
		 */
		getID: function() {
			return this.data('id');
		}
	});

}(jQuery));