/*
 * jQuery UI menubar
 * 
 * TODO move to jquery.ui.menubar.js
 */
(function($) {

// TODO code formatting
$.widget("ui.menubar", {
   options: {
      buttons: false,
      menuIcon: false
   },
	_create: function() {
		var self = this;
		var items = this.items = this.element.children("li")
			.addClass("ui-menubar-item")
			.attr("role", "presentation")
			.children("button, a");
		items.slice(1).attr("tabIndex", -1);
		var o = this.options;
				
		this.element.addClass('ui-menubar ui-widget-header ui-helper-clearfix').attr("role", "menubar");
		this._focusable(items);
		this._hoverable(items);
		// TODO elm is used just once, so the each probably isn't nedded anymore
		items.next("ul").each(function(i, elm) {
			$(elm).menu({
				select: function(event, ui) {
					ui.item.parents("ul.ui-menu:last").hide();
					self._trigger( "select", event, ui );
					self._close();
					// TODO what is this targetting? there's probably a better way to access it
					$(event.target).prev().focus();
				}
			}).hide()
			.attr("aria-hidden", "true")
			.attr("aria-expanded", "false")
			.keydown(function(event) {
				var menu = $(this);
				if (menu.is(":hidden")) 
					return;
				switch (event.keyCode) {
				case $.ui.keyCode.LEFT:
					self._left(event);
					event.preventDefault();
					break;
				case $.ui.keyCode.RIGHT:
					self._right(event);
					event.preventDefault();
					break;
				};
			})
		});
		items.each(function() {
			var input = $(this),
				   menu = input.next("ul");
			
			input.bind("click focus mouseenter", function(event) {
				// ignore triggered focus event
				if (event.type == "focus" && !event.originalEvent) {
					return;
				}
   				event.preventDefault();
				// TODO can we simplify or extractthis check? especially the last two expressions
				// there's a similar active[0] == menu[0] check in _open
			   	if (event.type == "click" && menu.is(":visible") && self.active && self.active[0] == menu[0]) {
					self._close();
					return;
				}
   				if ((self.open && event.type == "mouseenter") || event.type == "click") {
   					self._open(event, menu);
   				}
   			})
			.bind( "keydown", function( event ) {
				switch ( event.keyCode ) {
				case $.ui.keyCode.SPACE:
				case $.ui.keyCode.UP:
				case $.ui.keyCode.DOWN:
					self._open( event, $( this ).next() );
					event.preventDefault();
					break;
				case $.ui.keyCode.LEFT:
					self._prev( event, $( this ) );
					event.preventDefault();
					break;
				case $.ui.keyCode.RIGHT:
					self._next( event, $( this ) );
					event.preventDefault();
					break;
				}
			})
			.addClass("ui-button ui-widget ui-button-text-only ui-menubar-link")
			.attr("role", "menuitem")
			.attr("aria-haspopup", "true")
			.wrapInner("<span class='ui-button-text'></span>");

			// TODO review if these options are a good choice, maybe they can be merged
			if (o.menuIcon) {
				input.addClass("ui-state-default").append("<span class='ui-button-icon-secondary ui-icon ui-icon-triangle-1-s'></span>");
				input.removeClass("ui-button-text-only").addClass("ui-button-text-icon-secondary");
			}
   			
			if (!o.buttons) {
				// TODO ui-menubar-link is added above, not needed here?
				input.addClass('ui-menubar-link').removeClass('ui-state-default');
			};			
			
		});
		self._bind({
			keydown: function(event) {
				// TODO merge the two ifs
				if (event.keyCode == $.ui.keyCode.ESCAPE) {
					if (self.active && self.active.menu("left", event) !== true) {
						var active = self.active;
						self.active.blur();
						self._close( event );
						active.prev().focus();
					}
				}
			},
			focusout : function( event ) {
				self.closeTimer = setTimeout(function() {
					self._close( event );
				}, 100);
			},
			// TODO change order, focusin first
			focusin :function( event ) {
				clearTimeout(self.closeTimer);
			}
		});
	},
	
	_destroy : function() {
		var items = this.element.children("li")
			.removeClass("ui-menubar-item")
			.removeAttr("role", "presentation")
			.children("button, a");
		
		this.element.removeClass('ui-menubar ui-widget-header ui-helper-clearfix').removeAttr("role", "menubar").unbind(".menubar");;
		items.unbind("focusin focusout click focus mouseenter keydown");
		
		items
			.removeClass("ui-button ui-widget ui-button-text-only ui-menubar-link ui-state-default")
			.removeAttr("role", "menuitem")
			.removeAttr("aria-haspopup", "true")
			.children("span.ui-button-text").each(function(i, e) {
				var item = $(this);
				item.parent().html(item.html());
			})
			.end()
			.children(".ui-icon").remove();

		$(document).unbind(".menubar");
		
		this.element.find(":ui-menu").menu("destroy")
		.show()
		.removeAttr("aria-hidden", "true")
		.removeAttr("aria-expanded", "false")
		.removeAttr("tabindex")
		.unbind("keydown", "blur");
	},
	
	_close: function() {
		if (!this.active || !this.active.length)
			return;
		this.active.menu("closeAll").hide().attr("aria-hidden", "true").attr("aria-expanded", "false");
		this.active.prev().removeClass("ui-state-active").removeAttr("tabIndex");
		this.active = null;
		this.open = false;
	},
	
	_open: function(event, menu) {
		// on a single-button menubar, ignore reopening the same menu
		if (this.active && this.active[0] == menu[0]) {
			return;
		}
		// almost the same as _close above, but don't remove tabIndex
		if (this.active) {
			this.active.menu("closeAll").hide().attr("aria-hidden", "true").attr("aria-expanded", "false");
			this.active.prev().removeClass("ui-state-active");
		}
		// set tabIndex -1 to have the button skipped on shift-tab when menu is open (it gets focus)
		var button = menu.prev().addClass("ui-state-active").attr("tabIndex", -1);
		this.active = menu.show().position({
			my: "left top",
			at: "left bottom",
			of: button
		})
		.removeAttr("aria-hidden").attr("aria-expanded", "true")
		.menu("focus", event, menu.children("li").first())
		// TODO need a comment here why both events are triggered
		.focus()
		.focusin();
		this.open = true;
	},
	
	// TODO refactor this and the next three methods
	_prev: function( event, button ) {
		button.attr("tabIndex", -1);
		var prev = button.parent().prevAll("li").children( ".ui-button" ).eq( 0 );
		if (prev.length) {
			prev.removeAttr("tabIndex")[0].focus();
		} else {
			var lastItem = this.element.children("li:last").children(".ui-button:last");
			lastItem.removeAttr("tabIndex")[0].focus();
		}
	},
	
	_next: function( event, button ) {
		button.attr("tabIndex", -1);
		var next = button.parent().nextAll("li").children( ".ui-button" ).eq( 0 );
		if (next.length) {
			next.removeAttr("tabIndex")[0].focus();
		} else {
			var firstItem = this.element.children("li:first").children(".ui-button:first");
			firstItem.removeAttr("tabIndex")[0].focus();
		}
	},

	// TODO rename to parent
	_left: function(event) {
		var prev = this.active.parent().prevAll("li:eq(0)").children( ".ui-menu" ).eq( 0 );
		if (prev.length) {
			this._open(event, prev);
		} else {
			var lastItem = this.element.children("li:last").children(".ui-menu:first");
			this._open(event, lastItem);
		}
	},
	
	// TODO rename to child (or something like that)
	_right: function(event) {
		var next = this.active.parent().nextAll("li:eq(0)").children( ".ui-menu" ).eq( 0 );
		if (next.length) {
			this._open(event, next);
		} else {
			var firstItem = this.element.children("li:first").children(".ui-menu:first");
			this._open(event, firstItem);
		}
	}
});

}(jQuery));