/*
 * jQuery UI Accordion @VERSION
 *
 * Copyright 2012, 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/Accordion
 *
 * Depends:
 *	jquery.ui.core.js
 *	jquery.ui.widget.js
 */
(function( $, undefined ) {

$.widget( "ui.accordion", {
	version: "@VERSION",
	options: {
		active: 0,
		animate: {},
		collapsible: false,
		event: "click",
		header: "> li > :first-child,> :not(li):even",
		heightStyle: "auto",
		icons: {
			activeHeader: "ui-icon-triangle-1-s",
			header: "ui-icon-triangle-1-e"
		},

		// callbacks
		activate: null,
		beforeActivate: null
	},

	_create: function() {
		var options = this.options;

		this.prevShow = this.prevHide = $();
		this.element.addClass( "ui-accordion ui-widget ui-helper-reset" );

		this.headers = this.element.find( options.header )
			.addClass( "ui-accordion-header ui-helper-reset ui-state-default ui-corner-all" );
		this._hoverable( this.headers );
		this._focusable( this.headers );

		this.headers.next()
			.addClass( "ui-accordion-content ui-helper-reset ui-widget-content ui-corner-bottom" );

		// don't allow collapsible: false and active: false
		if ( !options.collapsible && options.active === false ) {
			options.active = 0;
		}
		// handle negative values
		if ( options.active < 0 ) {
			options.active += this.headers.length;
		}
		this.active = this._findActive( options.active )
			.addClass( "ui-accordion-header-active ui-state-active" )
			.toggleClass( "ui-corner-all ui-corner-top" );
		this.active.next().addClass( "ui-accordion-content-active" );

		this._createIcons();
		this.originalHeight = this.element[0].style.height;
		this.refresh();

		// ARIA
		this.element.attr( "role", "tablist" );

		this.headers
			.attr( "role", "tab" )
			// TODO: use _bind()
			.bind( "keydown.accordion", $.proxy( this, "_keydown" ) )
			.next()
				.attr( "role", "tabpanel" );

		this.headers
			.not( this.active )
			.attr({
				// TODO: document support for each of these
				"aria-expanded": "false",
				"aria-selected": "false",
				tabIndex: -1
			})
			.next()
				.hide();

		// make sure at least one header is in the tab order
		if ( !this.active.length ) {
			this.headers.eq( 0 ).attr( "tabIndex", 0 );
		} else {
			this.active.attr({
				"aria-expanded": "true",
				"aria-selected": "true",
				tabIndex: 0
			});
		}

		this._setupEvents( options.event );
	},

	_getCreateEventData: function() {
		return {
			header: this.active,
			content: !this.active.length ? $() : this.active.next()
		};
	},

	_createIcons: function() {
		var icons = this.options.icons;
		if ( icons ) {
			$( "<span>" )
				.addClass( "ui-accordion-header-icon ui-icon " + icons.header )
				.prependTo( this.headers );
			this.active.children( ".ui-accordion-header-icon" )
				.removeClass( icons.header )
				.addClass( icons.activeHeader );
			this.headers.addClass( "ui-accordion-icons" );
		}
	},

	_destroyIcons: function() {
		this.headers
			.removeClass( "ui-accordion-icons" )
			.children( ".ui-accordion-header-icon" )
				.remove();
	},

	_destroy: function() {
		// clean up main element
		this.element
			.removeClass( "ui-accordion ui-widget ui-helper-reset" )
			.removeAttr( "role" );

		// clean up headers
		this.headers
			.unbind( ".accordion" )
			.removeClass( "ui-accordion-header ui-accordion-header-active ui-helper-reset ui-state-default ui-corner-all ui-state-active ui-state-disabled ui-corner-top" )
			.removeAttr( "role" )
			.removeAttr( "aria-expanded" )
			.removeAttr( "aria-selected" )
			.removeAttr( "tabIndex" );
		this._destroyIcons();

		// clean up content panels
		var contents = this.headers.next()
			.css( "display", "" )
			.removeAttr( "role" )
			.removeClass( "ui-helper-reset ui-widget-content ui-corner-bottom ui-accordion-content ui-accordion-content-active ui-state-disabled" );
		if ( this.options.heightStyle !== "content" ) {
			this.element.css( "height", this.originalHeight );
			contents.css( "height", "" );
		}
	},

	_setOption: function( key, value ) {
		if ( key === "active" ) {
			// _activate() will handle invalid values and update this.options
			this._activate( value );
			return;
		}

		if ( key === "event" ) {
			if ( this.options.event ) {
				// TODO: this is incorrect for multiple events (see _setupEvents)
				this.headers.unbind( this.options.event + ".accordion", this._eventHandler );
			}
			this._setupEvents( value );
		}

		this._super( key, value );

		// setting collapsible: false while collapsed; open first panel
		if ( key === "collapsible" && !value && this.options.active === false ) {
			this._activate( 0 );
		}

		if ( key === "icons" ) {
			this._destroyIcons();
			if ( value ) {
				this._createIcons();
			}
		}

		// #5332 - opacity doesn't cascade to positioned elements in IE
		// so we need to add the disabled class to the headers and panels
		if ( key === "disabled" ) {
			this.headers.add( this.headers.next() )
				.toggleClass( "ui-state-disabled", !!value );
		}
	},

	_keydown: function( event ) {
		// TODO: remove disabled check when using _bind()
		if ( this.options.disabled || event.altKey || event.ctrlKey ) {
			return;
		}

		var keyCode = $.ui.keyCode,
			length = this.headers.length,
			currentIndex = this.headers.index( event.target ),
			toFocus = false;

		switch ( event.keyCode ) {
			case keyCode.RIGHT:
			case keyCode.DOWN:
				toFocus = this.headers[ ( currentIndex + 1 ) % length ];
				break;
			case keyCode.LEFT:
			case keyCode.UP:
				toFocus = this.headers[ ( currentIndex - 1 + length ) % length ];
				break;
			case keyCode.SPACE:
			case keyCode.ENTER:
				this._eventHandler( event );
		}

		if ( toFocus ) {
			$( event.target ).attr( "tabIndex", -1 );
			$( toFocus ).attr( "tabIndex", 0 );
			toFocus.focus();
			event.preventDefault();
		}
	},

	refresh: function() {
		var heightStyle = this.options.heightStyle,
			parent = this.element.parent(),
			maxHeight,
			overflow;

		this.element.css( "height", this.originalHeight );

		if ( heightStyle === "fill" ) {
			// IE 6 treats height like minHeight, so we need to turn off overflow
			// in order to get a reliable height
			// we use the minHeight support test because we assume that only
			// browsers that don't support minHeight will treat height as minHeight
			if ( !$.support.minHeight ) {
				overflow = parent.css( "overflow" );
				parent.css( "overflow", "hidden");
			}
			maxHeight = parent.height();
			this.element.siblings( ":visible" ).each(function() {
				var elem = $( this ),
					position = elem.css( "position" );

				if ( position === "absolute" || position === "fixed" ) {
					return;
				}
				maxHeight -= elem.outerHeight( true );
			});
			if ( overflow ) {
				parent.css( "overflow", overflow );
			}

			this.headers.each(function() {
				maxHeight -= $( this ).outerHeight( true );
			});

			this.headers.next()
				.each(function() {
					$( this ).height( Math.max( 0, maxHeight -
						$( this ).innerHeight() + $( this ).height() ) );
				})
				.css( "overflow", "auto" );
		} else if ( heightStyle === "auto" ) {
			maxHeight = 0;
			this.headers.next()
				.each(function() {
					maxHeight = Math.max( maxHeight, $( this ).height( "" ).height() );
				})
				.height( maxHeight );
		}

		if ( heightStyle !== "content" ) {
			this.element.height( this.element.height() );
		}
	},

	_activate: function( index ) {
		var active = this._findActive( index )[ 0 ];

		// trying to activate the already active panel
		if ( active === this.active[ 0 ] ) {
			return;
		}

		// trying to collapse, simulate a click on the currently active header
		active = active || this.active[ 0 ];

		this._eventHandler({
			target: active,
			currentTarget: active,
			preventDefault: $.noop
		});
	},

	_findActive: function( selector ) {
		return typeof selector === "number" ? this.headers.eq( selector ) : $();
	},

	_setupEvents: function( event ) {
		if ( event ) {
			// TODO: use _bind()
			this.headers.bind( event.split( " " ).join( ".accordion " ) + ".accordion",
				$.proxy( this, "_eventHandler" ) );
		}
	},

	_eventHandler: function( event ) {
		var options = this.options,
			active = this.active,
			clicked = $( event.currentTarget ),
			clickedIsActive = clicked[ 0 ] === active[ 0 ],
			collapsing = clickedIsActive && options.collapsible,
			toShow = collapsing ? $() : clicked.next(),
			toHide = active.next(),
			eventData = {
				oldHeader: active,
				oldContent: toHide,
				newHeader: collapsing ? $() : clicked,
				newContent: toShow
			};

		event.preventDefault();

		if ( options.disabled ||
				// click on active header, but not collapsible
				( clickedIsActive && !options.collapsible ) ||
				// allow canceling activation
				( this._trigger( "beforeActivate", event, eventData ) === false ) ) {
			return;
		}

		options.active = collapsing ? false : this.headers.index( clicked );

		// when the call to ._toggle() comes after the class changes
		// it causes a very odd bug in IE 8 (see #6720)
		this.active = clickedIsActive ? $() : clicked;
		this._toggle( eventData );

		// switch classes
		active
			.removeClass( "ui-accordion-header-active ui-state-active ui-corner-top" )
			.addClass( "ui-corner-all" );
		if ( options.icons ) {
			active.children( ".ui-accordion-header-icon" )
				.removeClass( options.icons.activeHeader )
				.addClass( options.icons.header );
		}

		if ( !clickedIsActive ) {
			clicked
				.removeClass( "ui-corner-all" )
				.addClass( "ui-accordion-header-active ui-state-active ui-corner-top" );
			if ( options.icons ) {
				clicked.children( ".ui-accordion-header-icon" )
					.removeClass( options.icons.header )
					.addClass( options.icons.activeHeader );
			}

			clicked
				.next()
				.addClass( "ui-accordion-content-active" );
		}
	},

	_toggle: function( data ) {
		var toShow = data.newContent,
			toHide = this.prevShow.length ? this.prevShow : data.oldContent;

		// handle activating a panel during the animation for another activation
		this.prevShow.add( this.prevHide ).stop( true, true );
		this.prevShow = toShow;
		this.prevHide = toHide;

		if ( this.options.animate ) {
			this._animate( toShow, toHide, data );
		} else {
			toHide.hide();
			toShow.show();
			this._toggleComplete( data );
		}

		// TODO assert that the blur and focus triggers are really necessary, remove otherwise
		toHide.prev()
			.attr({
				"aria-expanded": "false",
				"aria-selected": "false",
				tabIndex: -1
			})
			.blur();
		toShow.prev()
			.attr({
				"aria-expanded": "true",
				"aria-selected": "true",
				tabIndex: 0
			})
			.focus();
	},

	_animate: function( toShow, toHide, data ) {
		var total, easing, duration,
			that = this,
			down = toShow.length &&
				( !toHide.length || ( toShow.index() < toHide.index() ) ),
			animate = this.options.animate || {},
			options = down && animate.down || animate,
			complete = function() {
				toShow.removeData( "ui-accordion-height" );
				that._toggleComplete( data );
			};

		if ( typeof options === "number" ) {
			duration = options;
		}
		if ( typeof options === "string" ) {
			easing = options;
		}
		// fall back from options to animation in case of partial down settings
		easing = easing || options.easing || animate.easing;
		duration = duration || options.duration || animate.duration;

		if ( !toHide.size() ) {
			return toShow.animate( showProps, duration, easing, complete );
		}
		if ( !toShow.size() ) {
			return toHide.animate( hideProps, duration, easing, complete );
		}

		total = toShow.show().outerHeight();
		toHide.animate( hideProps, duration, easing );
		toShow
			.hide()
			.data( "ui-accordion-height", {
				total: total,
				toHide: toHide
			})
			.animate( this.options.heightStyle === "content" ? showProps : showPropsAdjust,
				duration, easing, complete );
	},

	_toggleComplete: function( data ) {
		var toShow = data.newContent,
			toHide = data.oldContent;

		// other classes are removed before the animation; this one needs to stay until completed
		toHide.removeClass( "ui-accordion-content-active" );
		// Work around for rendering bug in IE (#5421)
		if ( toHide.length ) {
			toHide.parent()[0].className = toHide.parent()[0].className;
		}

		this._trigger( "activate", null, data );
	}
});

$.fx.step.accordionHeight = function( fx ) {
	var elem = $( fx.elem ),
		data = elem.data( "ui-accordion-height" );
	elem.height( data.total - elem.outerHeight() - data.toHide.outerHeight() + elem.height() );
};
var hideProps = {},
	showProps = {},
	showPropsAdjust = {};
hideProps.height = hideProps.paddingTop = hideProps.paddingBottom =
	hideProps.borderTopWidth = hideProps.borderBottomWidth = "hide";
showProps.height = showProps.paddingTop = showProps.paddingBottom =
	showProps.borderTopWidth = showProps.borderBottomWidth = "show";
$.extend( showPropsAdjust, showProps, { accordionHeight: "show" } );



// DEPRECATED
if ( $.uiBackCompat !== false ) {
	// navigation options
	(function( $, prototype ) {
		$.extend( prototype.options, {
			navigation: false,
			navigationFilter: function() {
				return this.href.toLowerCase() === location.href.toLowerCase();
			}
		});

		var _create = prototype._create;
		prototype._create = function() {
			if ( this.options.navigation ) {
				var that = this,
					headers = this.element.find( this.options.header ),
					content = headers.next(),
					current = headers.add( content )
						.find( "a" )
						.filter( this.options.navigationFilter )
						[ 0 ];
				if ( current ) {
					headers.add( content ).each( function( index ) {
						if ( $.contains( this, current ) ) {
							that.options.active = Math.floor( index / 2 );
							return false;
						}
					});
				}
			}
			_create.call( this );
		};
	}( jQuery, jQuery.ui.accordion.prototype ) );

	// height options
	(function( $, prototype ) {
		$.extend( prototype.options, {
			heightStyle: null, // remove default so we fall back to old values
			autoHeight: true, // use heightStyle: "auto"
			clearStyle: false, // use heightStyle: "content"
			fillSpace: false // use heightStyle: "fill"
		});

		var _create = prototype._create,
			_setOption = prototype._setOption;

		$.extend( prototype, {
			_create: function() {
				this.options.heightStyle = this.options.heightStyle ||
					this._mergeHeightStyle();

				_create.call( this );
			},

			_setOption: function( key, value ) {
				if ( key === "autoHeight" || key === "clearStyle" || key === "fillSpace" ) {
					this.options.heightStyle = this._mergeHeightStyle();
				}
				_setOption.apply( this, arguments );
			},

			_mergeHeightStyle: function() {
				var options = this.options;

				if ( options.fillSpace ) {
					return "fill";
				}

				if ( options.clearStyle ) {
					return "content";
				}

				if ( options.autoHeight ) {
					return "auto";
				}
			}
		});
	}( jQuery, jQuery.ui.accordion.prototype ) );

	// icon options
	(function( $, prototype ) {
		$.extend( prototype.options.icons, {
			activeHeader: null, // remove default so we fall back to old values
			headerSelected: "ui-icon-triangle-1-s"
		});

		var _createIcons = prototype._createIcons;
		prototype._createIcons = function() {
			if ( this.options.icons ) {
				this.options.icons.activeHeader = this.options.icons.activeHeader ||
					this.options.icons.headerSelected;
			}
			_createIcons.call( this );
		};
	}( jQuery, jQuery.ui.accordion.prototype ) );

	// expanded active option, activate method
	(function( $, prototype ) {
		prototype.activate = prototype._activate;

		var _findActive = prototype._findActive;
		prototype._findActive = function( index ) {
			if ( index === -1 ) {
				index = false;
			}
			if ( index && typeof index !== "number" ) {
				index = this.headers.index( this.headers.filter( index ) );
				if ( index === -1 ) {
					index = false;
				}
			}
			return _findActive.call( this, index );
		};
	}( jQuery, jQuery.ui.accordion.prototype ) );

	// resize method
	jQuery.ui.accordion.prototype.resize = jQuery.ui.accordion.prototype.refresh;

	// change events
	(function( $, prototype ) {
		$.extend( prototype.options, {
			change: null,
			changestart: null
		});

		var _trigger = prototype._trigger;
		prototype._trigger = function( type, event, data ) {
			var ret = _trigger.apply( this, arguments );
			if ( !ret ) {
				return false;
			}

			if ( type === "beforeActivate" ) {
				ret = _trigger.call( this, "changestart", event, data );
			} else if ( type === "activate" ) {
				ret = _trigger.call( this, "change", event, data );
			}
			return ret;
		};
	}( jQuery, jQuery.ui.accordion.prototype ) );

	// animated option
	// NOTE: this only provides support for "slide", "bounceslide", and easings
	// not the full $.ui.accordion.animations API
	(function( $, prototype ) {
		$.extend( prototype.options, {
			animate: null,
			animated: "slide"
		});

		var _create = prototype._create;
		prototype._create = function() {
			var options = this.options;
			if ( options.animate === null ) {
				if ( !options.animated ) {
					options.animate = false;
				} else if ( options.animated === "slide" ) {
					options.animate = 300;
				} else if ( options.animated === "bounceslide" ) {
					options.animate = {
						duration: 200,
						down: {
							easing: "easeOutBounce",
							duration: 1000
						}
					}
				} else {
					options.animate = options.animated;
				}
			}

			_create.call( this );
		};
	}( jQuery, jQuery.ui.accordion.prototype ) );
}

})( jQuery );