/*
 * jQuery UI Popup @VERSION
 *
 * Copyright 2011, AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://jquery.org/license
 *
 * http://docs.jquery.com/UI/Popup
 *
 * Depends:
 *	jquery.ui.core.js
 *	jquery.ui.widget.js
 *	jquery.ui.position.js
 */
(function($) {

var idIncrement = 0;

$.widget( "ui.popup", {
	version: "@VERSION",
	options: {
		position: {
			my: "left top",
			at: "left bottom"
		}
	},
	_create: function() {
		if ( !this.options.trigger ) {
			this.options.trigger = this.element.prev();
		}

		if ( !this.element.attr( "id" ) ) {
			this.element.attr( "id", "ui-popup-" + idIncrement++ );
			this.generatedId = true;
		}

		if ( !this.element.attr( "role" ) ) {
			// TODO alternatives to tooltip are dialog and menu, all three aren't generic popups
			this.element.attr( "role", "dialog" );
			this.generatedRole = true;
		}

		this.options.trigger
			.attr( "aria-haspopup", "true" )
			.attr( "aria-owns", this.element.attr( "id" ) );

		this.element
			.addClass( "ui-popup" );
		this.close();

		this._bind(this.options.trigger, {
			keydown: function( event ) {
				// prevent space-to-open to scroll the page, only happens for anchor ui.button
				if ( $.ui.button && this.options.trigger.is( "a:ui-button" ) && event.keyCode == $.ui.keyCode.SPACE ) {
					event.preventDefault();
				}
				// TODO handle SPACE to open popup? only when not handled by ui.button
				if ( event.keyCode == $.ui.keyCode.SPACE && this.options.trigger.is( "a:not(:ui-button)" ) ) {
					this.options.trigger.trigger( "click", event );
				}
				// translate keydown to click
				// opens popup and let's tooltip hide itself
				if ( event.keyCode == $.ui.keyCode.DOWN ) {
					// prevent scrolling
					event.preventDefault();
					this.options.trigger.trigger( "click", event );
				}
			},
			click: function( event ) {
				event.preventDefault();
				if (this.isOpen) {
					// let it propagate to close
					return;
				}
				clearTimeout( this.closeTimer );
				this._delay(function() {
					this.open( event );
				}, 1);
			}
		});

		if ( !this.element.is( ":ui-menu" ) ) {
			//default use case, wrap tab order in popup
			this._bind({ keydown : function( event ) {
					if ( event.keyCode !== $.ui.keyCode.TAB ) {
						return;
					}
					var tabbables = $( ":tabbable", this.element ),
						first = tabbables.first(),
						last  = tabbables.last();
					if ( event.target === last[ 0 ] && !event.shiftKey ) {
						first.focus( 1 );
						event.preventDefault();
					} else if ( event.target === first[ 0 ] && event.shiftKey ) {
						last.focus( 1 );
						event.preventDefault();
					}
				}
			});
		}

		this._bind({
			focusout: function( event ) {
				// use a timer to allow click to clear it and letting that
				// handle the closing instead of opening again
				this.closeTimer = this._delay( function() {
					this.close( event );
				}, 100);
			},
			focusin: function( event ) {
				clearTimeout( this.closeTimer );
			}
		});

		this._bind({
			// TODO only triggered on element if it can receive focus
			// bind to document instead?
			// either element itself or a child should be focusable
			keyup: function( event ) {
				if ( event.keyCode == $.ui.keyCode.ESCAPE && this.element.is( ":visible" ) ) {
					this.close( event );
					// TODO move this to close()? would allow menu.select to call popup.close, and get focus back to trigger
					this.options.trigger.focus();
				}
			}
		});

		this._bind(document, {
			click: function( event ) {
				if ( this.isOpen && !$(event.target).closest(".ui-popup").length ) {
					this.close( event );
				}
			}
		})
	},

	_destroy: function() {
		this.element
			.show()
			.removeClass( "ui-popup" )
			.removeAttr( "aria-hidden" )
			.removeAttr( "aria-expanded" )
			.unbind( "keypress.ui-popup");

		this.options.trigger
			.removeAttr( "aria-haspopup" )
			.removeAttr( "aria-owns" );

		if ( this.generatedId ) {
			this.element.removeAttr( "id" );
		}
		if ( this.generatedRole ) {
			this.element.removeAttr( "role" );
		}
	},

	open: function( event ) {
		var position = $.extend( {}, {
			of: this.options.trigger
		}, this.options.position );

		this.element
			.show()
			.attr( "aria-hidden", "false" )
			.attr( "aria-expanded", "true" )
			.position( position );

		if (this.element.is( ":ui-menu" )) { //popup is a menu
			this.element.menu( "focus", event, this.element.children( "li" ).first() );
			this.element.focus();
		} else {
			// set focus to the first tabbable element in the popup container
			// if there are no tabbable elements, set focus on the popup itself
			var tabbables = this.element.find( ":tabbable" );
			this.removeTabIndex = false;
			if ( !tabbables.length ) {
				if ( !this.element.is(":tabbable") ) {
					this.element.attr("tabindex", "0");
					this.removeTabIndex = true;
				}
				tabbables = tabbables.add( this.element[ 0 ] );
			}
			tabbables.first().focus( 1 );
		}

		// take trigger out of tab order to allow shift-tab to skip trigger
		this.options.trigger.attr( "tabindex", -1 );
		this.isOpen = true;
		this._trigger( "open", event );
	},

	close: function( event ) {
		this.element
			.hide()
			.attr( "aria-hidden", "true" )
			.attr( "aria-expanded", "false" );

		this.options.trigger.attr( "tabindex" , 0 );
		if ( this.removeTabIndex ) {
			this.element.removeAttr( "tabindex" );
		}
		this.isOpen = false;
		this._trigger( "close", event );
	}
});

}(jQuery));