/* jshint forin:true, noarg:true, noempty:true, eqeqeq:true, boss:true, undef:true, curly:true, browser:true, jquery:true */

  /*

   * jQuery MultiSelect UI Widget 1.13
   * Copyright (c) 2012 Eric Hynds

   *
   * http://www.erichynds.com/jquery/jquery-ui-multiselect-widget/
   *
   * Depends:
   *   - jQuery 1.4.2+
   *   - jQuery UI 1.8 widget factory
   *
   * Optional:
   *   - jQuery UI effects
   *   - jQuery UI position utility
   *
   * Dual licensed under the MIT and GPL licenses:
   *   http://www.opensource.org/licenses/mit-license.php
   *   http://www.gnu.org/licenses/gpl.html
   *
  */
  (function($, undefined){
  
  var multiselectID = 0;
  
  $.widget("ech.multiselect", {
  
  	// default options
  	options: {
  		header: true,
  		height: 175,
  		minWidth: 225,
  		classes: '',
  		checkAllText: 'Check all',
  		uncheckAllText: 'Uncheck all',
  		noneSelectedText: 'Select options',
  		selectedText: '# selected',
  		selectedList: 0,

  		show: null,
  		hide: null,

  		autoOpen: false,
  		multiple: true,
  		position: {}
  	},
  
  	_create: function(){
  		var el = this.element.hide(),
  			o = this.options;
  
  		this.speed = $.fx.speeds._default; // default speed for effects
  		this._isOpen = false; // assume no
  
  		var
  			button = (this.button = $('<button type="button"><span class="ui-icon ui-icon-triangle-2-n-s"></span></button>'))
  				.addClass('ui-multiselect ui-widget ui-state-default ui-corner-all')
  				.addClass( o.classes )
  				.attr({ 'title':el.attr('title'), 'aria-haspopup':true, 'tabIndex':el.attr('tabIndex') })
  				.insertAfter( el ),
  
  			buttonlabel = (this.buttonlabel = $('<span />'))
  				.html( o.noneSelectedText )
  				.appendTo( button ),
  
  			menu = (this.menu = $('<div />'))
  				.addClass('ui-multiselect-menu ui-widget ui-widget-content ui-corner-all')
  				.addClass( o.classes )

  				.appendTo( document.body ),

  
  			header = (this.header = $('<div />'))
  				.addClass('ui-widget-header ui-corner-all ui-multiselect-header ui-helper-clearfix')
  				.appendTo( menu ),
  
  			headerLinkContainer = (this.headerLinkContainer = $('<ul />'))
  				.addClass('ui-helper-reset')
  				.html(function(){
  					if( o.header === true ){
  						return '<li><a class="ui-multiselect-all" href="#"><span class="ui-icon ui-icon-check"></span><span>' + o.checkAllText + '</span></a></li><li><a class="ui-multiselect-none" href="#"><span class="ui-icon ui-icon-closethick"></span><span>' + o.uncheckAllText + '</span></a></li>';
  					} else if(typeof o.header === "string"){
  						return '<li>' + o.header + '</li>';
  					} else {
  						return '';
  					}
  				})
  				.append('<li class="ui-multiselect-close"><a href="#" class="ui-multiselect-close"><span class="ui-icon ui-icon-circle-close"></span></a></li>')
  				.appendTo( header ),
  
  			checkboxContainer = (this.checkboxContainer = $('<ul />'))
  				.addClass('ui-multiselect-checkboxes ui-helper-reset')
  				.appendTo( menu );
  
  		// perform event bindings
  		this._bindEvents();
  
  		// build menu
  		this.refresh( true );
  
  		// some addl. logic for single selects
  		if( !o.multiple ){
  			menu.addClass('ui-multiselect-single');
  		}
  	},
  
  	_init: function(){
  		if( this.options.header === false ){
  			this.header.hide();
  		}
  		if( !this.options.multiple ){
  			this.headerLinkContainer.find('.ui-multiselect-all, .ui-multiselect-none').hide();
  		}
  		if( this.options.autoOpen ){
  			this.open();
  		}
  		if( this.element.is(':disabled') ){
  			this.disable();
  		}
  	},
  
  	refresh: function( init ){
  		var el = this.element,
  			o = this.options,
  			menu = this.menu,
  			checkboxContainer = this.checkboxContainer,
  			optgroups = [],

  			html = "",

  			id = el.attr('id') || multiselectID++; // unique ID for the label & option tags
  
  		// build items

  		el.find('option').each(function( i ){

  			var $this = $(this),
  				parent = this.parentNode,
  				title = this.innerHTML,
  				description = this.title,
  				value = this.value,

  				inputID = 'ui-multiselect-' + (this.id || id + '-option-' + i),

  				isDisabled = this.disabled,
  				isSelected = this.selected,

  				labelClasses = [ 'ui-corner-all' ],
  				liClasses = (isDisabled ? 'ui-multiselect-disabled ' : ' ') + this.className,

  				optLabel;
  
  			// is this an optgroup?

  			if( parent.tagName === 'OPTGROUP' ){
  				optLabel = parent.getAttribute( 'label' );

  
  				// has this optgroup been added already?
  				if( $.inArray(optLabel, optgroups) === -1 ){

  					html += '<li class="ui-multiselect-optgroup-label ' + parent.className + '"><a href="#">' + optLabel + '</a></li>';

  					optgroups.push( optLabel );
  				}
  			}
  
  			if( isDisabled ){

  				labelClasses.push( 'ui-state-disabled' );

  			}
  
  			// browsers automatically select the first option
  			// by default with single selects
  			if( isSelected && !o.multiple ){

  				labelClasses.push( 'ui-state-active' );

  			}

  			html += '<li class="' + liClasses + '">';

  
  			// create the label

  			html += '<label for="' + inputID + '" title="' + description + '" class="' + labelClasses.join(' ') + '">';
  			html += '<input id="' + inputID + '" name="multiselect_' + id + '" type="' + (o.multiple ? "checkbox" : "radio") + '" value="' + value + '" title="' + title + '"';

  
  			// pre-selected?
  			if( isSelected ){

  				html += ' checked="checked"';
  				html += ' aria-selected="true"';

  			}
  
  			// disabled?
  			if( isDisabled ){

  				html += ' disabled="disabled"';
  				html += ' aria-disabled="true"';

  			}
  
  			// add the title and close everything off

  			html += ' /><span>' + title + '</span></label></li>';

  		});
  
  		// insert into the DOM

  		checkboxContainer.html( html );

  
  		// cache some moar useful elements
  		this.labels = menu.find('label');

  		this.inputs = this.labels.children('input');

  
  		// set widths
  		this._setButtonWidth();
  		this._setMenuWidth();
  
  		// remember default value
  		this.button[0].defaultValue = this.update();
  
  		// broadcast refresh event; useful for widgets
  		if( !init ){
  			this._trigger('refresh');
  		}
  	},

  	// updates the button text. call refresh() to rebuild

  	update: function(){
  		var o = this.options,

  			$inputs = this.inputs,

  			$checked = $inputs.filter(':checked'),
  			numChecked = $checked.length,
  			value;
  
  		if( numChecked === 0 ){
  			value = o.noneSelectedText;
  		} else {
  			if($.isFunction( o.selectedText )){
  				value = o.selectedText.call(this, numChecked, $inputs.length, $checked.get());
  			} else if( /\d/.test(o.selectedList) && o.selectedList > 0 && numChecked <= o.selectedList){

  				value = $checked.map(function(){ return $(this).next().html(); }).get().join(', ');

  			} else {
  				value = o.selectedText.replace('#', numChecked).replace('#', $inputs.length);
  			}
  		}
  
  		this.buttonlabel.html( value );
  		return value;
  	},
  
  	// binds events
  	_bindEvents: function(){
  		var self = this, button = this.button;
  
  		function clickHandler(){
  			self[ self._isOpen ? 'close' : 'open' ]();
  			return false;
  		}
  
  		// webkit doesn't like it when you click on the span :(
  		button
  			.find('span')
  			.bind('click.multiselect', clickHandler);
  
  		// button events
  		button.bind({
  			click: clickHandler,
  			keypress: function( e ){
  				switch(e.which){
  					case 27: // esc
  					case 38: // up
  					case 37: // left
  						self.close();
  						break;
  					case 39: // right
  					case 40: // down
  						self.open();
  						break;
  				}
  			},
  			mouseenter: function(){
  				if( !button.hasClass('ui-state-disabled') ){
  					$(this).addClass('ui-state-hover');
  				}
  			},
  			mouseleave: function(){
  				$(this).removeClass('ui-state-hover');
  			},
  			focus: function(){
  				if( !button.hasClass('ui-state-disabled') ){
  					$(this).addClass('ui-state-focus');
  				}
  			},
  			blur: function(){
  				$(this).removeClass('ui-state-focus');
  			}
  		});
  
  		// header links
  		this.header
  			.delegate('a', 'click.multiselect', function( e ){
  				// close link
  				if( $(this).hasClass('ui-multiselect-close') ){
  					self.close();
  
  				// check all / uncheck all
  				} else {
  					self[ $(this).hasClass('ui-multiselect-all') ? 'checkAll' : 'uncheckAll' ]();
  				}
  
  				e.preventDefault();
  			});
  
  		// optgroup label toggle support
  		this.menu
  			.delegate('li.ui-multiselect-optgroup-label a', 'click.multiselect', function( e ){
  				e.preventDefault();
  
  				var $this = $(this),
  					$inputs = $this.parent().nextUntil('li.ui-multiselect-optgroup-label').find('input:visible:not(:disabled)'),

  					nodes = $inputs.get(),
  					label = $this.parent().text();

  
  				// trigger event and bail if the return is false
  				if( self._trigger('beforeoptgrouptoggle', e, { inputs:nodes, label:label }) === false ){
  					return;
  				}
  
  				// toggle inputs
  				self._toggleChecked(
  					$inputs.filter(':checked').length !== $inputs.length,
  					$inputs
  				);
  
  				self._trigger('optgrouptoggle', e, {
  				    inputs: nodes,
  				    label: label,
  				    checked: nodes[0].checked
  				});
  			})
  			.delegate('label', 'mouseenter.multiselect', function(){
  				if( !$(this).hasClass('ui-state-disabled') ){
  					self.labels.removeClass('ui-state-hover');
  					$(this).addClass('ui-state-hover').find('input').focus();
  				}
  			})
  			.delegate('label', 'keydown.multiselect', function( e ){
  				e.preventDefault();
  
  				switch(e.which){
  					case 9: // tab
  					case 27: // esc
  						self.close();
  						break;
  					case 38: // up
  					case 40: // down
  					case 37: // left
  					case 39: // right
  						self._traverse(e.which, this);
  						break;
  					case 13: // enter
  						$(this).find('input')[0].click();
  						break;
  				}
  			})
  			.delegate('input[type="checkbox"], input[type="radio"]', 'click.multiselect', function( e ){
  				var $this = $(this),
  					val = this.value,
  					checked = this.checked,
  					tags = self.element.find('option');
  
  				// bail if this input is disabled or the event is cancelled

  				if( this.disabled || self._trigger('click', e, { value: val, text: this.title, checked: checked }) === false ){

  					e.preventDefault();
  					return;
  				}

  				// make sure the input has focus. otherwise, the esc key
  				// won't close the menu after clicking an item.
  				$this.focus();

  				// toggle aria state
  				$this.attr('aria-selected', checked);
  
  				// change state on the original option tags
  				tags.each(function(){
  					if( this.value === val ){
  						this.selected = checked;
  					} else if( !self.options.multiple ){
  						this.selected = false;
  					}
  				});
  
  				// some additional single select-specific logic
  				if( !self.options.multiple ){
  					self.labels.removeClass('ui-state-active');
  					$this.closest('label').toggleClass('ui-state-active', checked );
  
  					// close menu
  					self.close();
  				}
  
  				// fire change on the select box
  				self.element.trigger("change");
  
  				// setTimeout is to fix multiselect issue #14 and #47. caused by jQuery issue #3827
  				// http://bugs.jquery.com/ticket/3827
  				setTimeout($.proxy(self.update, self), 10);
  			});
  
  		// close each widget when clicking on any other element/anywhere else on the page
  		$(document).bind('mousedown.multiselect', function( e ){
  			if(self._isOpen && !$.contains(self.menu[0], e.target) && !$.contains(self.button[0], e.target) && e.target !== self.button[0]){
  				self.close();
  			}
  		});
  
  		// deal with form resets.  the problem here is that buttons aren't
  		// restored to their defaultValue prop on form reset, and the reset
  		// handler fires before the form is actually reset.  delaying it a bit
  		// gives the form inputs time to clear.
  		$(this.element[0].form).bind('reset.multiselect', function(){

  			setTimeout($.proxy(self.refresh, self), 10);

  		});
  	},
  
  	// set button width
  	_setButtonWidth: function(){
  		var width = this.element.outerWidth(),
  			o = this.options;
  
  		if( /\d/.test(o.minWidth) && width < o.minWidth){
  			width = o.minWidth;
  		}
  
  		// set widths
  		this.button.width( width );
  	},
  
  	// set menu width
  	_setMenuWidth: function(){
  		var m = this.menu,
  			width = this.button.outerWidth()-
  				parseInt(m.css('padding-left'),10)-
  				parseInt(m.css('padding-right'),10)-
  				parseInt(m.css('border-right-width'),10)-
  				parseInt(m.css('border-left-width'),10);
  
  		m.width( width || this.button.outerWidth() );
  	},
  
  	// move up or down within the menu
  	_traverse: function( which, start ){
  		var $start = $(start),
  			moveToLast = which === 38 || which === 37,
  
  			// select the first li that isn't an optgroup label / disabled
  			$next = $start.parent()[moveToLast ? 'prevAll' : 'nextAll']('li:not(.ui-multiselect-disabled, .ui-multiselect-optgroup-label)')[ moveToLast ? 'last' : 'first']();
  
  		// if at the first/last element
  		if( !$next.length ){

  			var $container = this.menu.find('ul').last();

  
  			// move to the first/last
  			this.menu.find('label')[ moveToLast ? 'last' : 'first' ]().trigger('mouseover');
  
  			// set scroll position
  			$container.scrollTop( moveToLast ? $container.height() : 0 );
  
  		} else {
  			$next.find('label').trigger('mouseover');
  		}
  	},
  
  	// This is an internal function to toggle the checked property and
  	// other related attributes of a checkbox.
  	//
  	// The context of this function should be a checkbox; do not proxy it.

  	_toggleState: function( prop, flag ){

  		return function(){

  			if( !this.disabled ) {
  				this[ prop ] = flag;
  			}

  
  			if( flag ){
  				this.setAttribute('aria-selected', true);
  			} else {
  				this.removeAttribute('aria-selected');
  			}

  		};

  	},
  
  	_toggleChecked: function( flag, group ){

  		var $inputs = (group && group.length) ?  group : this.inputs,

  			self = this;
  
  		// toggle state on inputs

  		$inputs.each(this._toggleState('checked', flag));
  
  		// give the first input focus
  		$inputs.eq(0).focus();

  
  		// update button text
  		this.update();
  
  		// gather an array of the values that actually changed
  		var values = $inputs.map(function(){
  			return this.value;
  		}).get();
  
  		// toggle state on original option tags
  		this.element
  			.find('option')
  			.each(function(){
  				if( !this.disabled && $.inArray(this.value, values) > -1 ){

  					self._toggleState('selected', flag).call( this );

  				}
  			});
  
  		// trigger the change event on the select
  		if( $inputs.length ) {
  			this.element.trigger("change");
  		}
  	},
  
  	_toggleDisabled: function( flag ){
  		this.button
  			.attr({ 'disabled':flag, 'aria-disabled':flag })[ flag ? 'addClass' : 'removeClass' ]('ui-state-disabled');

  		var inputs = this.menu.find('input');
  		var key = "ech-multiselect-disabled";
  
  		if(flag) {
  			// remember which elements this widget disabled (not pre-disabled)
  			// elements, so that they can be restored if the widget is re-enabled.
  			inputs = inputs.filter(':enabled')
  				.data(key, true)
  		} else {
  			inputs = inputs.filter(function() {
  				return $.data(this, key) === true;
  			}).removeData(key);
  		}
  
  		inputs
  			.attr({ 'disabled':flag, 'arial-disabled':flag })

  			.parent()[ flag ? 'addClass' : 'removeClass' ]('ui-state-disabled');
  
  		this.element
  			.attr({ 'disabled':flag, 'aria-disabled':flag });
  	},
  
  	// open the menu
  	open: function( e ){
  		var self = this,
  			button = this.button,
  			menu = this.menu,
  			speed = this.speed,

  			o = this.options,
  			args = [];

  
  		// bail if the multiselectopen event returns false, this widget is disabled, or is already open
  		if( this._trigger('beforeopen') === false || button.hasClass('ui-state-disabled') || this._isOpen ){
  			return;
  		}

  		var $container = menu.find('ul').last(),

  			effect = o.show,

  			pos = button.offset();

  
  		// figure out opening effects/speeds
  		if( $.isArray(o.show) ){
  			effect = o.show[0];
  			speed = o.show[1] || self.speed;
  		}

  		// if there's an effect, assume jQuery UI is in use
  		// build the arguments to pass to show()
  		if( effect ) {
        args = [ effect, speed ];
  		}

  		// set the scroll of the checkbox container
  		$container.scrollTop(0).height(o.height);
  
  		// position and show menu
  		if( $.ui.position && !$.isEmptyObject(o.position) ){
  			o.position.of = o.position.of || button;
  
  			menu
  				.show()
  				.position( o.position )

  				.hide();

  
  		// if position utility is not available...
  		} else {
  			menu.css({

  				top: pos.top + button.outerHeight(),

  				left: pos.left

  			});

  		}

  		// show the menu, maybe with a speed/effect combo
  		$.fn.show.apply(menu, args);

  		// select the first option
  		// triggering both mouseover and mouseover because 1.4.2+ has a bug where triggering mouseover
  		// will actually trigger mouseenter.  the mouseenter trigger is there for when it's eventually fixed
  		this.labels.eq(0).trigger('mouseover').trigger('mouseenter').find('input').trigger('focus');
  
  		button.addClass('ui-state-active');
  		this._isOpen = true;
  		this._trigger('open');
  	},
  
  	// close the menu
  	close: function(){
  		if(this._trigger('beforeclose') === false){
  			return;
  		}

  		var o = this.options,
  		    effect = o.hide,
  		    speed = this.speed,
  		    args = [];

  
  		// figure out opening effects/speeds
  		if( $.isArray(o.hide) ){
  			effect = o.hide[0];
  			speed = o.hide[1] || this.speed;
  		}

      if( effect ) {
        args = [ effect, speed ];
      }
  
      $.fn.hide.apply(this.menu, args);

  		this.button.removeClass('ui-state-active').trigger('blur').trigger('mouseleave');
  		this._isOpen = false;
  		this._trigger('close');
  	},
  
  	enable: function(){
  		this._toggleDisabled(false);
  	},
  
  	disable: function(){
  		this._toggleDisabled(true);
  	},
  
  	checkAll: function( e ){
  		this._toggleChecked(true);
  		this._trigger('checkAll');
  	},
  
  	uncheckAll: function(){
  		this._toggleChecked(false);
  		this._trigger('uncheckAll');
  	},
  
  	getChecked: function(){
  		return this.menu.find('input').filter(':checked');
  	},
  
  	destroy: function(){
  		// remove classes + data
  		$.Widget.prototype.destroy.call( this );
  
  		this.button.remove();
  		this.menu.remove();
  		this.element.show();
  
  		return this;
  	},
  
  	isOpen: function(){
  		return this._isOpen;
  	},
  
  	widget: function(){
  		return this.menu;
  	},

  	getButton: function(){
  	  return this.button;
    },

  	// react to option changes after initialization
  	_setOption: function( key, value ){
  		var menu = this.menu;
  
  		switch(key){
  			case 'header':
  				menu.find('div.ui-multiselect-header')[ value ? 'show' : 'hide' ]();
  				break;
  			case 'checkAllText':
  				menu.find('a.ui-multiselect-all span').eq(-1).text(value);
  				break;
  			case 'uncheckAllText':
  				menu.find('a.ui-multiselect-none span').eq(-1).text(value);
  				break;
  			case 'height':

  				menu.find('ul').last().height( parseInt(value,10) );

  				break;
  			case 'minWidth':
  				this.options[ key ] = parseInt(value,10);
  				this._setButtonWidth();
  				this._setMenuWidth();
  				break;
  			case 'selectedText':
  			case 'selectedList':
  			case 'noneSelectedText':
  				this.options[key] = value; // these all needs to update immediately for the update() call
  				this.update();
  				break;
  			case 'classes':
  				menu.add(this.button).removeClass(this.options.classes).addClass(value);
  				break;

  			case 'multiple':
  				menu.toggleClass('ui-multiselect-single', !value);
  				this.options.multiple = value;
  				this.element[0].multiple = value;
  				this.refresh();

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