/**
 * File: LeftAndMain.BatchActions.js
 */
(function($) {
	$.entwine('ss.tree', function($){
	
		/**
		 * Class: #Form_BatchActionsForm
		 * 
		 * Batch actions which take a bunch of selected pages,
		 * usually from the CMS tree implementation, and perform serverside
		 * callbacks on the whole set. We make the tree selectable when the jQuery.UI tab
		 * enclosing this form is opened.
		 * 
		 * Events:
		 *  register - Called before an action is added.
		 *  unregister - Called before an action is removed.
		 */
		$('#Form_BatchActionsForm').entwine({
	
			/**
			 * Variable: Actions
			 * (Array) Stores all actions that can be performed on the collected IDs as
			 * function closures. This might trigger filtering of the selected IDs,
			 * a confirmation message, etc.
			 */
			Actions: [],

			getTree: function() {
				return $('.cms-tree');
			},

			fromTree: {
				oncheck_node: function(e, data){
					this.serializeFromTree();
				},
				onuncheck_node: function(e, data){
					this.serializeFromTree();
				}
			},
			
			/**
			 * @func registerDefault
			 * @desc Register default bulk confirmation dialogs
			 */
			registerDefault: function() {
				// Publish selected pages action
				this.register('admin/pages/batchactions/publish', function(ids) {
					var confirmed = confirm(
						ss.i18n.inject(
							ss.i18n._t(
								"CMSMAIN.BATCH_PUBLISH_PROMPT",
								"You have {num} page(s) selected.\n\nDo you really want to publish?"
							),
							{'num': ids.length}
						)
					);
					return (confirmed) ? ids : false;
				});

				// Unpublish selected pages action
				this.register('admin/pages/batchactions/unpublish', function(ids) {
					var confirmed = confirm(
						ss.i18n.inject(
							ss.i18n._t(
								"CMSMAIN.BATCH_UNPUBLISH_PROMPT",
								"You have {num} page(s) selected.\n\nDo you really want to unpublish"
							),
							{'num': ids.length}
						)
					);
					return (confirmed) ? ids : false;
				});

				// Delete selected pages action
				// @deprecated since 4.0 Use archive instead
				this.register('admin/pages/batchactions/delete', function(ids) {
					var confirmed = confirm(
						ss.i18n.inject(
							ss.i18n._t(
								"CMSMAIN.BATCH_DELETE_PROMPT",
								"You have {num} page(s) selected.\n\nDo you really want to delete?"
							),
							{'num': ids.length}
						)
					);
					return (confirmed) ? ids : false;
				});

				// Delete selected pages action
				this.register('admin/pages/batchactions/archive', function(ids) {
					var confirmed = confirm(
						ss.i18n.inject(
							ss.i18n._t(
								"CMSMAIN.BATCH_ARCHIVE_PROMPT",
								"You have {num} page(s) selected.\n\nDo you really want to archive?\n\nThese pages will be removed from both the draft and published sites without discarding the history."
							),
							{'num': ids.length}
						)
					);
					return (confirmed) ? ids : false;
				});

				// Delete selected pages from live action
				this.register('admin/pages/batchactions/deletefromlive', function(ids) {
					var confirmed = confirm(
						ss.i18n.inject(
							ss.i18n._t(
								"CMSMAIN.BATCH_DELETELIVE_PROMPT",
								"You have {num} page(s) selected.\n\nDo you really want to delete these pages from live?"
							),
							{'num': ids.length}
						)
					);
					return (confirmed) ? ids : false;
				});
			},

			onadd: function() {
				this.registerDefault();
				this._super();
			},

			/**
			 * @func register
			 * @param {string} type
			 * @param {function} callback
			 */
			register: function(type, callback) {
				this.trigger('register', {type: type, callback: callback});
				var actions = this.getActions();
				actions[type] = callback;
				this.setActions(actions);
			},

			/**
			 * @func unregister
			 * @param {string} type
			 * @desc Remove an existing action.
			 */
			unregister: function(type) {
				this.trigger('unregister', {type: type});

				var actions = this.getActions();
				if(actions[type]) delete actions[type];
				this.setActions(actions);
			},

			/**
			 * @func refreshSelected
			 * @param {object} rootNode
			 * @desc Ajax callbacks determine which pages is selectable in a certain batch action.
			 */
			refreshSelected : function(rootNode) {
				var self = this,
					st = this.getTree(),
					ids = this.getIDs(),
					allIds = [],
					selectedAction = this.find(':input[name=Action]').val();
			
				// Default to refreshing the entire tree
				if(rootNode == null) rootNode = st;

				for(var idx in ids) {
					$($(st).getNodeByID(idx)).addClass('selected').attr('selected', 'selected');
				}

				// If no action is selected, enable all nodes
				if(!selectedAction || selectedAction == -1) {
					$(rootNode).find('li').each(function() {
						$(this).setEnabled(true);
					});
					return;
				}

				// Disable the nodes while the ajax request is being processed
				$(rootNode).find('li').each(function() {
					allIds.push($(this).data('id'));
					$(this).addClass('treeloading').setEnabled(false);
				});
				
				// Post to the server to ask which pages can have this batch action applied
				var applicablePagesURL = selectedAction + '/applicablepages/?csvIDs=' + allIds.join(',');
				jQuery.getJSON(applicablePagesURL, function(applicableIDs) {
					// Set a CSS class on each tree node indicating which can be batch-actioned and which can't
					jQuery(rootNode).find('li').each(function() {
						$(this).removeClass('treeloading');

						var id = $(this).data('id');
						if(id == 0 || $.inArray(id, applicableIDs) >= 0) {
							$(this).setEnabled(true);
						} else {
							// De-select the node if it's non-applicable
							$(this).removeClass('selected').setEnabled(false);
							$(this).prop('selected', false);
						}
					});
					
					self.serializeFromTree();
				});
			},
			
			/**
			 * @func serializeFromTree
			 * @return {boolean}
			 */
			serializeFromTree: function() {
				var tree = this.getTree(), ids = tree.getSelectedIDs();
				
				// write IDs to the hidden field
				this.setIDs(ids);
				
				return true;
			},
			
			/**
			 * @func setIDS
			 * @param {array} ids
			 */
			setIDs: function(ids) {
				this.find(':input[name=csvIDs]').val(ids ? ids.join(',') : null);
			},
			
			/**
			 * @func getIDS
			 * @return {array}
			 */
			getIDs: function() {
				// Map empty value to empty array
				var value = this.find(':input[name=csvIDs]').val();
				return value
					? value.split(',')
					: [];
			},

			onsubmit: function(e) {
				var self = this, ids = this.getIDs(), tree = this.getTree(), actions = this.getActions();
				
				// if no nodes are selected, return with an error
				if(!ids || !ids.length) {
					alert(ss.i18n._t('CMSMAIN.SELECTONEPAGE', 'Please select at least one page'));
					e.preventDefault();
					return false;
				}
				
				// apply callback, which might modify the IDs
				var type = this.find(':input[name=Action]').val();
				if(actions[type]) {
					ids = this.getActions()[type].apply(this, [ids]);
				}
				
				// Discontinue processing if there are no further items
				if(!ids || !ids.length) {
					e.preventDefault();
					return false;
				}
			
				// write (possibly modified) IDs back into to the hidden field
				this.setIDs(ids);
				
				// Reset failure states
				tree.find('li').removeClass('failed');
			
				var button = this.find(':submit:first');
				button.addClass('loading');
			
				jQuery.ajax({
					// don't use original form url
					url: type,
					type: 'POST',
					data: this.serializeArray(),
					complete: function(xmlhttp, status) {
						button.removeClass('loading');

						// Deselect all nodes
						tree.jstree('uncheck_all');
						self.setIDs([]);

						// Reset action
						self.find(':input[name=Action]').val('').change();
					
						// status message (decode into UTF-8, HTTP headers don't allow multibyte)
						var msg = xmlhttp.getResponseHeader('X-Status');
						if(msg) statusMessage(decodeURIComponent(msg), (status == 'success') ? 'good' : 'bad');
					},
					success: function(data, status) {
						var id, node;
						
						if(data.modified) {
							var modifiedNodes = [];
							for(id in data.modified) {
								node = tree.getNodeByID(id);
								tree.jstree('set_text', node, data.modified[id]['TreeTitle']);
								modifiedNodes.push(node);
							}
							$(modifiedNodes).effect('highlight');
						}
						if(data.deleted) {
							for(id in data.deleted) {
								node = tree.getNodeByID(id);
								if(node.length)	tree.jstree('delete_node', node);
							}
						}
						if(data.error) {
							for(id in data.error) {
								node = tree.getNodeByID(id);
								$(node).addClass('failed');
							}
						}
					},
					dataType: 'json'
				});
			
				// Never process this action; Only invoke via ajax
				e.preventDefault();
				return false;
			}
		
		});

		$('.cms-content-batchactions-button').entwine({
			onmatch: function () {
				this._super();
				this.updateTree();
			},
			onunmatch: function () {
				this._super();
			},
			onclick: function (e) {
				this.updateTree();
			},
			updateTree: function () {
				var tree = $('.cms-tree'),
					form = $('#Form_BatchActionsForm');

				this._super();

				if(this.data('active')) {
					tree.addClass('multiple');
					tree.removeClass('draggable');
					form.serializeFromTree();
					$('#Form_BatchActionsForm').refreshSelected();
				} else {
					tree.removeClass('multiple');
					tree.addClass('draggable');
				}
			}
		});

		/**
		 * Class: #Form_BatchActionsForm :select[name=Action]
		 */
		$('#Form_BatchActionsForm select[name=Action]').entwine({
			onchange: function(e) {
				var form = $(e.target.form),
					btn = form.find(':submit'),
					selected = $(e.target).val();
				if(!selected || selected == -1) {
					btn.attr('disabled', 'disabled').button('refresh');
				} else {
					btn.removeAttr('disabled').button('refresh');
				}
				
				// Refresh selected / enabled nodes
				$('#Form_BatchActionsForm').refreshSelected();

				// TODO Should work by triggering change() along, but doesn't - entwine event bubbling?
				this.trigger("liszt:updated");

				this._super(e);
			}
		});
	});
	
})(jQuery);