/**

 * Pointer jQuery widget.

 */

(function($){

	var identifier = 0,

		zindex = 9999;

	$.widget("wp.pointer", {

		options: {

			pointerClass: 'wp-pointer',

			pointerWidth: 320,

			content: function( respond, event, t ) {

				return $(this).text();

			},

			buttons: function( event, t ) {

				var close  = ( wpPointerL10n ) ? wpPointerL10n.dismiss : 'Dismiss',

					button = $('<a class="close" href="#">' + close + '</a>');

				return button.bind( 'click.pointer', function(e) {

					e.preventDefault();

					t.element.pointer('close');

				});

			},

			position: 'top',

			show: function( event, t ) {

				t.pointer.show();

				t.opened();

			},

			hide: function( event, t ) {

				t.pointer.hide();

				t.closed();

			},

			document: document

		},

		_create: function() {

			var positioning,

				family;

			this.content = $('<div class="wp-pointer-content"></div>');

			this.arrow   = $('<div class="wp-pointer-arrow"><div class="wp-pointer-arrow-inner"></div></div>');

			family = this.element.parents().add( this.element );

			positioning = 'absolute';

			if ( family.filter(function(){ return 'fixed' === $(this).css('position'); }).length )

				positioning = 'fixed';

			this.pointer = $('<div />')

				.append( this.content )

				.append( this.arrow )

				.attr('id', 'wp-pointer-' + identifier++)

				.addClass( this.options.pointerClass )

				.css({'position': positioning, 'width': this.options.pointerWidth+'px', 'display': 'none'})

				.appendTo( this.options.document.body );

		},

		_setOption: function( key, value ) {

			var o   = this.options,

				tip = this.pointer;

			// Handle document transfer

			if ( key === "document" && value !== o.document ) {

				tip.detach().appendTo( value.body );

			// Handle class change

			} else if ( key === "pointerClass" ) {

				tip.removeClass( o.pointerClass ).addClass( value );

			}

			// Call super method.

			$.Widget.prototype._setOption.apply( this, arguments );

			// Reposition automatically

			if ( key === "position" ) {

				this.reposition();

			// Update content automatically if pointer is open

			} else if ( key === "content" && this.active ) {

				this.update();

			}

		},

		destroy: function() {

			this.pointer.remove();

			$.Widget.prototype.destroy.call( this );

		},

		widget: function() {

			return this.pointer;

		},

		update: function( event ) {

			var self = this,

				o    = this.options,

				dfd  = $.Deferred(),

				content;

			if ( o.disabled )

				return;

			dfd.done( function( content ) {

				self._update( event, content );

			})

			// Either o.content is a string...

			if ( typeof o.content === 'string' ) {

				content = o.content;

			// ...or o.content is a callback.

			} else {

				content = o.content.call( this.element[0], dfd.resolve, event, this._handoff() );

			}

			// If content is set, then complete the update.

			if ( content )

				dfd.resolve( content );

			return dfd.promise();

		},

		/**

		 * Update is separated into two functions to allow events to defer

		 * updating the pointer (e.g. fetch content with ajax, etc).

		 */

		_update: function( event, content ) {

			var buttons,

				o = this.options;

			if ( ! content )

				return;

			this.pointer.stop(); // Kill any animations on the pointer.

			this.content.html( content );

			buttons = o.buttons.call( this.element[0], event, this._handoff() );

			if ( buttons ) {

				buttons.wrap('<div class="wp-pointer-buttons" />').parent().appendTo( this.content );

			}

			this.reposition();

		},

		reposition: function() {

			var position;

			if ( this.options.disabled )

				return;

			position = this._processPosition( this.options.position );

			// Reposition pointer.

			this.pointer.css({

				top: 0,

				left: 0,

				zIndex: zindex++ // Increment the z-index so that it shows above other opened pointers.

			}).show().position($.extend({

				of: this.element,

				collision: 'fit none'

			}, position )); // the object comes before this.options.position so the user can override position.of.

			this.repoint();

		},

		repoint: function() {

			var o = this.options,

				edge;

			if ( o.disabled )

				return;

			edge = ( typeof o.position == 'string' ) ? o.position : o.position.edge;

			// Remove arrow classes.

			this.pointer[0].className = this.pointer[0].className.replace( /wp-pointer-[^\s'"]*/, '' );

			// Add arrow class.

			this.pointer.addClass( 'wp-pointer-' + edge );

		},

		_processPosition: function( position ) {

			var opposite = {

					top: 'bottom',

					bottom: 'top',

					left: 'right',

					right: 'left'

				},

				result;

			// If the position object is a string, it is shorthand for position.edge.

			if ( typeof position == 'string' ) {

				result = {

					edge: position + ''

				};

			} else {

				result = $.extend( {}, position );

			}

			if ( ! result.edge )

				return result;

			if ( result.edge == 'top' || result.edge == 'bottom' ) {

				result.align = result.align || 'left';

				result.at = result.at || result.align + ' ' + opposite[ result.edge ];

				result.my = result.my || result.align + ' ' + result.edge;

			} else {

				result.align = result.align || 'top';

				result.at = result.at || opposite[ result.edge ] + ' ' + result.align;

				result.my = result.my || result.edge + ' ' + result.align;

			}

			return result;

		},

		open: function( event ) {

			var self = this,

				o    = this.options;

			if ( this.active || o.disabled || this.element.is(':hidden') )

				return;

			this.update().done( function() {

				self._open( event );

			});

		},

		_open: function( event ) {

			var self = this,

				o    = this.options;

			if ( this.active || o.disabled || this.element.is(':hidden') )

				return;

			this.active = true;

			this._trigger( "open", event, this._handoff() );

			this._trigger( "show", event, this._handoff({

				opened: function() {

					self._trigger( "opened", event, self._handoff() );

				}

			}));

		},

		close: function( event ) {

			if ( !this.active || this.options.disabled )

				return;

			var self = this;

			this.active = false;

			this._trigger( "close", event, this._handoff() );

			this._trigger( "hide", event, this._handoff({

				closed: function() {

					self._trigger( "closed", event, self._handoff() );

				}

			}));

		},

		sendToTop: function( event ) {

			if ( this.active )

				this.pointer.css( 'z-index', zindex++ );

		},

		toggle: function( event ) {

			if ( this.pointer.is(':hidden') )

				this.open( event );

			else

				this.close( event );

		},

		_handoff: function( extend ) {

			return $.extend({

				pointer: this.pointer,

				element: this.element

			}, extend);

		}

	});

})(jQuery);