/**

 * bootstrap-multiselect.js

 * https://github.com/davidstutz/bootstrap-multiselect

 *

 * Copyright 2012, 2013 David Stutz

 *

 * Dual licensed under the BSD-3-Clause and the Apache License, Version 2.0.

 */

!function($) {

    "use strict";// jshint ;_;

    if (typeof ko !== 'undefined' && ko.bindingHandlers && !ko.bindingHandlers.multiselect) {

        ko.bindingHandlers.multiselect = {

            init: function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {},

            update: function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {

               var config = ko.utils.unwrapObservable(valueAccessor());

               var selectOptions = allBindingsAccessor().options;

               var ms = $(element).data('multiselect');

               if (!ms) {

                  $(element).multiselect(config);

               }

               else {

                  ms.updateOriginalOptions();

                  if (selectOptions && selectOptions().length !== ms.originalOptions.length) {

                     $(element).multiselect('rebuild');

                  }

               }

            }

        };

    }

    /**

     * Constructor to create a new multiselect using the given select.

     * 

     * @param {jQuery} select

     * @param {Object} options

     * @returns {Multiselect}

     */

    function Multiselect(select, options) {

        this.options = this.mergeOptions(options);

        this.$select = $(select);

        // Initialization.

        // We have to clone to create a new reference.

        this.originalOptions = this.$select.clone()[0].options;

        this.query = '';

        this.searchTimeout = null;

        this.options.multiple = this.$select.attr('multiple') === "multiple";

        this.options.onChange = $.proxy(this.options.onChange, this);

        this.options.onDropdownShow = $.proxy(this.options.onDropdownShow, this);

        this.options.onDropdownHide = $.proxy(this.options.onDropdownHide, this);

        // Build select all if enabled.

        this.buildContainer();

        this.buildButton();

        this.buildSelectAll();

        this.buildDropdown();

        this.buildDropdownOptions();

        this.buildFilter();

        this.updateButtonText();

        this.updateSelectAll();

        this.$select.hide().after(this.$container);

    };

    Multiselect.prototype = {

        defaults: {

            /**

             * Default text function will either print 'None selected' in case no

             * option is selected or a list of the selected options up to a length of 3 selected options.

             * 

             * @param {jQuery} options

             * @param {jQuery} select

             * @returns {String}

             */

            buttonText: function(options, select) {

                if (options.length === 0) {

                    return this.nonSelectedText + ' <b class="caret"></b>';

                }

                else {

                    if (options.length > this.numberDisplayed) {

                        return options.length + ' ' + this.nSelectedText + ' <b class="caret"></b>';

                    }

                    else {

                        var selected = '';

                        options.each(function() {

                            var label = ($(this).attr('label') !== undefined) ? $(this).attr('label') : $(this).html();

                            selected += label + ', ';

                        });

                        return selected.substr(0, selected.length - 2) + ' <b class="caret"></b>';

                    }

                }

            },

            /**

             * Updates the title of the button similar to the buttonText function.

             * @param {jQuery} options

             * @param {jQuery} select

             * @returns {@exp;selected@call;substr}

             */

            buttonTitle: function(options, select) {

                if (options.length === 0) {

                    return this.nonSelectedText;

                }

                else {

                    var selected = '';

                    options.each(function () {

                        selected += $(this).text() + ', ';

                    });

                    return selected.substr(0, selected.length - 2);

                }

            },

            /**

             * Create a label.

             * 

             * @param {jQuery} element

             * @returns {String}

             */

            label: function(element){

                return $(element).attr('label') || $(element).html();

            },

            /**

             * Triggered on change of the multiselect.

             * Not triggered when selecting/deselecting options manually.

             * 

             * @param {jQuery} option

             * @param {Boolean} checked

             */

            onChange : function(option, checked) {

            },

            /**

             * Triggered when the dropdown is shown.

             * 

             * @param {jQuery} event

             */

            onDropdownShow: function(event) {

            },

            /**

             * Triggered when the dropdown is hidden.

             * 

             * @param {jQuery} event

             */

            onDropdownHide: function(event) {

            },

            buttonClass: 'btn btn-default',

            dropRight: false,

            selectedClass: 'active',

            buttonWidth: 'auto',

            buttonContainer: '<div class="btn-group" />',

            // Maximum height of the dropdown menu.

            // If maximum height is exceeded a scrollbar will be displayed.

            maxHeight: false,

            includeSelectAllOption: false,

            selectAllText: ' Select all',

            selectAllValue: 'multiselect-all',

            enableFiltering: false,

            enableCaseInsensitiveFiltering: false,

            filterPlaceholder: 'Search',

            // possible options: 'text', 'value', 'both'

            filterBehavior: 'text',

            preventInputChangeEvent: false,

            nonSelectedText: 'None selected',

            nSelectedText: 'selected',

            numberDisplayed: 3

        },

        templates: {

            button: '<button type="button" class="multiselect dropdown-toggle" data-toggle="dropdown"></button>',

            ul: '<ul class="multiselect-container dropdown-menu"></ul>',

            filter: '<div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-search"></i></span><input class="form-control multiselect-search" type="text"></div>',

            li: '<li><a href="javascript:void(0);"><label></label></a></li>',

            divider: '<li class="divider"></li>',

            liGroup: '<li><label class="multiselect-group"></label></li>'

        },

        constructor: Multiselect,

        /**

         * Builds the container of the multiselect.

         */

        buildContainer: function() {

            this.$container = $(this.options.buttonContainer);

            this.$container.on('show.bs.dropdown', this.options.onDropdownShow);

            this.$container.on('hide.bs.dropdown', this.options.onDropdownHide);

        },

        /**

         * Builds the button of the multiselect.

         */

        buildButton: function() {

            this.$button = $(this.templates.button).addClass(this.options.buttonClass);

            // Adopt active state.

            if (this.$select.prop('disabled')) {

                this.disable();

            }

            else {

                this.enable();

            }

            // Manually add button width if set.

            if (this.options.buttonWidth && this.options.buttonWidth != 'auto') {

                this.$button.css({

                    'width' : this.options.buttonWidth

                });

            }

            // Keep the tab index from the select.

            var tabindex = this.$select.attr('tabindex');

            if (tabindex) {

                this.$button.attr('tabindex', tabindex);

            }

            this.$container.prepend(this.$button);

        },

        /**

         * Builds the ul representing the dropdown menu.

         */

        buildDropdown: function() {

            // Build ul.

            this.$ul = $(this.templates.ul);

            if (this.options.dropRight) {

                this.$ul.addClass('pull-right');

            }

            // Set max height of dropdown menu to activate auto scrollbar.

            if (this.options.maxHeight) {

                // TODO: Add a class for this option to move the css declarations.

                this.$ul.css({

                    'max-height': this.options.maxHeight + 'px',

                    'overflow-y': 'auto',

                    'overflow-x': 'hidden'

                });

            }

            this.$container.append(this.$ul);

        },

        /**

         * Build the dropdown options and binds all nessecary events.

         * Uses createDivider and createOptionValue to create the necessary options.

         */

        buildDropdownOptions: function() {

            this.$select.children().each($.proxy(function(index, element) {

                // Support optgroups and options without a group simultaneously.

                var tag = $(element).prop('tagName')

                    .toLowerCase();

                if (tag === 'optgroup') {

                    this.createOptgroup(element);

                }

                else if (tag === 'option') {

                    if ($(element).data('role') === 'divider') {

                        this.createDivider();

                    }

                    else {

                        this.createOptionValue(element);

                    }

                }

                // Other illegal tags will be ignored.

            }, this));

            // Bind the change event on the dropdown elements.

            $('li input', this.$ul).on('change', $.proxy(function(event) {

                var checked = $(event.target).prop('checked') || false;

                var isSelectAllOption = $(event.target).val() === this.options.selectAllValue;

                // Apply or unapply the configured selected class.

                if (this.options.selectedClass) {

                    if (checked) {

                        $(event.target).parents('li')

                            .addClass(this.options.selectedClass);

                    }

                    else {

                        $(event.target).parents('li')

                            .removeClass(this.options.selectedClass);

                    }

                }

                // Get the corresponding option.

                var value = $(event.target).val();

                var $option = this.getOptionByValue(value);

                var $optionsNotThis = $('option', this.$select).not($option);

                var $checkboxesNotThis = $('input', this.$container).not($(event.target));

                if (isSelectAllOption) {

                    if (this.$select[0][0].value === this.options.selectAllValue) {

                        var values = [];

                        var options = $('option[value!="' + this.options.selectAllValue + '"]', this.$select);

                        for (var i = 0; i < options.length; i++) {

                            // Additionally check whether the option is visible within the dropcown.

                            if (options[i].value !== this.options.selectAllValue && this.getInputByValue(options[i].value).is(':visible')) {

                                values.push(options[i].value);

                            }

                        }

                        if (checked) {

                            this.select(values);

                        }

                        else {

                            this.deselect(values);

                        }

                    }

                }

                if (checked) {

                    $option.prop('selected', true);

                    if (this.options.multiple) {

                        // Simply select additional option.

                        $option.prop('selected', true);

                    }

                    else {

                        // Unselect all other options and corresponding checkboxes.

                        if (this.options.selectedClass) {

                            $($checkboxesNotThis).parents('li').removeClass(this.options.selectedClass);

                        }

                        $($checkboxesNotThis).prop('checked', false);

                        $optionsNotThis.prop('selected', false);

                        // It's a single selection, so close.

                        this.$button.click();

                    }

                    if (this.options.selectedClass === "active") {

                        $optionsNotThis.parents("a").css("outline", "");

                    }

                }

                else {

                    // Unselect option.

                    $option.prop('selected', false);

                }

                this.$select.change();

                this.options.onChange($option, checked);

                this.updateButtonText();

                this.updateSelectAll();

                if(this.options.preventInputChangeEvent) {

                    return false;

                }

            }, this));

            $('li a', this.$ul).on('touchstart click', function(event) {

                event.stopPropagation();

                if (event.shiftKey) {

                    var checked = $(event.target).prop('checked') || false;

                    if (checked) {

                        var prev = $(event.target).parents('li:last')

                            .siblings('li[class="active"]:first');

                        var currentIdx = $(event.target).parents('li')

                            .index();

                        var prevIdx = prev.index();

                        if (currentIdx > prevIdx) {