/* 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);