/*

* Alternate Select Multiple (asmSelect) 1.0.4a beta - jQuery Plugin
* http://www.ryancramer.com/projects/asmselect/
* 
* Copyright (c) 2009 by Ryan Cramer - http://www.ryancramer.com
* 
* Dual licensed under the MIT (MIT-LICENSE.txt)
* and GPL (GPL-LICENSE.txt) licenses.
*
*/

// The references to $.browser where commented out because it // breaks with newer version of jQuery.

(function($) {

$.fn.asmSelect = function(customOptions) {

        var options = {

                listType: 'ol',                                         // Ordered list 'ol', or unordered list 'ul'
                sortable: false,                                        // Should the list be sortable?
                highlight: false,                                       // Use the highlight feature? 
                animate: false,                                         // Animate the the adding/removing of items in the list?
                addItemTarget: 'bottom',                                // Where to place new selected items in list: top or bottom
                hideWhenAdded: false,                                   // Hide the option when added to the list? works only in FF
                debugMode: false,                                       // Debug mode keeps original select visible 

                removeLabel: 'remove',                                  // Text used in the "remove" link
                highlightAddedLabel: 'Added: ',                         // Text that precedes highlight of added item
                highlightRemovedLabel: 'Removed: ',                     // Text that precedes highlight of removed item

                containerClass: 'asmContainer',                         // Class for container that wraps this widget
                selectClass: 'asmSelect',                               // Class for the newly created <select>
                optionDisabledClass: 'asmOptionDisabled',               // Class for items that are already selected / disabled
                listClass: 'asmList',                                   // Class for the list ($ol)
                listSortableClass: 'asmListSortable',                   // Another class given to the list when it is sortable
                listItemClass: 'asmListItem',                           // Class for the <li> list items
                listItemLabelClass: 'asmListItemLabel',                 // Class for the label text that appears in list items
                removeClass: 'asmListItemRemove',                       // Class given to the "remove" link
                highlightClass: 'asmHighlight'                          // Class given to the highlight <span>

                };

        $.extend(options, customOptions); 

        return this.each(function(index) {

                var $original = $(this);                                // the original select multiple
                var $container;                                         // a container that is wrapped around our widget
                var $select;                                            // the new select we have created
                var $ol;                                                // the list that we are manipulating
                var buildingSelect = false;                             // is the new select being constructed right now?
                var ieClick = false;                                    // in IE, has a click event occurred? ignore if not
                var ignoreOriginalChangeEvent = false;                  // originalChangeEvent bypassed when this is true

                function init() {

                        // initialize the alternate select multiple

                        // this loop ensures uniqueness, in case of existing asmSelects placed by ajax (1.0.3)
                        while($("#" + options.containerClass + index).size() > 0) index++; 

                        $select = $("<select></select>")
                                .addClass(options.selectClass)
                                .attr('name', options.selectClass + index)
                                .attr('id', options.selectClass + index); 

                        $selectRemoved = $("<select></select>"); 

                        $ol = $("<" + options.listType + "></" + options.listType + ">")
                                .addClass(options.listClass)
                                .attr('id', options.listClass + index); 

                        $container = $("<div></div>")
                                .addClass(options.containerClass) 
                                .attr('id', options.containerClass + index); 

                        buildSelect();

                        $select.change(selectChangeEvent)
                                .click(selectClickEvent); 

                        $original.change(originalChangeEvent)
                                .wrap($container).before($select).before($ol);

                        if(options.sortable) makeSortable();

                        // if($.browser.msie && $.browser.version < 8) $ol.css('display', 'inline-block'); // Thanks Matthew Hutton
                }

                function makeSortable() {

                        // make any items in the selected list sortable
                        // requires jQuery UI sortables, draggables, droppables

                        $ol.sortable({
                                items: 'li.' + options.listItemClass,
                                handle: '.' + options.listItemLabelClass,
                                axis: 'y',
                                update: function(e, data) {

                                        var updatedOptionId;

                                        $(this).children("li").each(function(n) {

                                                $option = $('#' + $(this).attr('rel')); 

                                                if($(this).is(".ui-sortable-helper")) {
                                                        updatedOptionId = $option.attr('id'); 
                                                        return;
                                                }

                                                $original.append($option); 
                                        }); 

                                        if(updatedOptionId) triggerOriginalChange(updatedOptionId, 'sort'); 
                                }

                        }).addClass(options.listSortableClass); 
                }

                function selectChangeEvent(e) {

                        // an item has been selected on the regular select we created
                        // check to make sure it's not an IE screwup, and add it to the list

                        // if($.browser.msie && $.browser.version < 7 && !ieClick) return;
                        var id = $(this).children("option:selected").slice(0,1).attr('rel'); 
                        addListItem(id);        
                        ieClick = false; 
                        triggerOriginalChange(id, 'add'); // for use by user-defined callbacks
                }

                function selectClickEvent() {

                        // IE6 lets you scroll around in a select without it being pulled down
                        // making sure a click preceded the change() event reduces the chance
                        // if unintended items being added. there may be a better solution?

                        ieClick = true; 
                }

                function originalChangeEvent(e) {

                        // select or option change event manually triggered
                        // on the original <select multiple>, so rebuild ours

                        if(ignoreOriginalChangeEvent) {
                                ignoreOriginalChangeEvent = false; 
                                return; 
                        }

                        $select.empty();
                        $ol.empty();
                        buildSelect();

                        // opera has an issue where it needs a force redraw, otherwise
                        // the items won't appear until something else forces a redraw
                        // if($.browser.opera) $ol.hide().fadeIn("fast");
                }

                function buildSelect() {

                        // build or rebuild the new select that the user
                        // will select items from

                        buildingSelect = true; 

                        // add a first option to be the home option / default selectLabel
                        $select.prepend("<option>" + $original.attr('title') + "</option>"); 

                        $original.children("option").each(function(n) {

                                var $t = $(this); 
                                var id; 

                                if(!$t.attr('id')) $t.attr('id', 'asm' + index + 'option' + n); 
                                id = $t.attr('id'); 

                                if($t.is(":selected")) {
                                        addListItem(id); 
                                        addSelectOption(id, true);                                              
                                } else {
                                        addSelectOption(id); 
                                }
                        });

                        if(!options.debugMode) $original.hide(); // IE6 requires this on every buildSelect()
                        selectFirstItem();
                        buildingSelect = false; 
                }

                function addSelectOption(optionId, disabled) {

                        // add an <option> to the <select>
                        // used only by buildSelect()

                        if(disabled == undefined) var disabled = false; 

                        var $O = $('#' + optionId); 
                        var $option = $("<option>" + $O.text() + "</option>")
                                .val($O.val())
                                .attr('rel', optionId);

                        if(disabled) disableSelectOption($option); 

                        $select.append($option); 
                }

                function selectFirstItem() {

                        // select the firm item from the regular select that we created

                        $select.children(":eq(0)").attr("selected", true); 
                }

                function disableSelectOption($option) {

                        // make an option disabled, indicating that it's already been selected
                        // because safari is the only browser that makes disabled items look 'disabled'
                        // we apply a class that reproduces the disabled look in other browsers

                        $option.addClass(options.optionDisabledClass)
                                .attr("selected", false)
                                .attr("disabled", true);

                        if(options.hideWhenAdded) $option.hide();
                        // if($.browser.msie) $select.hide().show(); // this forces IE to update display
                        if(true) $select.hide().show(); // this forces IE to update display
                }

                function enableSelectOption($option) {

                        // given an already disabled select option, enable it

                        $option.removeClass(options.optionDisabledClass)
                                .attr("disabled", false);

                        if(options.hideWhenAdded) $option.show();
                        // if($.browser.msie) $select.hide().show(); // this forces IE to update display
                        if(true) $select.hide().show(); // this forces IE to update display
                }

                function addListItem(optionId) {

                        // add a new item to the html list

                        var $O = $('#' + optionId); 

                        if(!$O) return; // this is the first item, selectLabel

                        var $removeLink = $("<a></a>")
                                .attr("href", "#")
                                .addClass(options.removeClass)
                                .prepend(options.removeLabel)
                                .click(function() { 
                                        dropListItem($(this).parent('li').attr('rel')); 
                                        return false; 
                                }); 

                        var $itemLabel = $("<span></span>")
                                .addClass(options.listItemLabelClass)
                                .html($O.html()); 

                        var $item = $("<li></li>")
                                .attr('rel', optionId)
                                .addClass(options.listItemClass)
                                .append($itemLabel)
                                .append($removeLink)
                                .hide();

                        if(!buildingSelect) {
                                if($O.is(":selected")) return; // already have it
                                $O.attr('selected', true); 
                        }

                        if(options.addItemTarget == 'top' && !buildingSelect) {
                                $ol.prepend($item); 
                                if(options.sortable) $original.prepend($O); 
                        } else {
                                $ol.append($item); 
                                if(options.sortable) $original.append($O); 
                        }

                        addListItemShow($item); 

                        disableSelectOption($("[rel=" + optionId + "]", $select));

                        if(!buildingSelect) {
                                setHighlight($item, options.highlightAddedLabel); 
                                selectFirstItem();
                                if(options.sortable) $ol.sortable("refresh");   
                        }

                }

                function addListItemShow($item) {

                        // reveal the currently hidden item with optional animation
                        // used only by addListItem()

                        if(options.animate && !buildingSelect) {
                                $item.animate({
                                        opacity: "show",
                                        height: "show"
                                }, 100, "swing", function() { 
                                        $item.animate({
                                                height: "+=2px"
                                        }, 50, "swing", function() {
                                                $item.animate({
                                                        height: "-=2px"
                                                }, 25, "swing"); 
                                        }); 
                                }); 
                        } else {
                                $item.show();
                        }
                }

                function dropListItem(optionId, highlightItem) {

                        // remove an item from the html list

                        if(highlightItem == undefined) var highlightItem = true; 
                        var $O = $('#' + optionId); 

                        $O.attr('selected', false); 
                        $item = $ol.children("li[rel=" + optionId + "]");

                        dropListItemHide($item); 
                        enableSelectOption($("[rel=" + optionId + "]", options.removeWhenAdded ? $selectRemoved : $select));

                        if(highlightItem) setHighlight($item, options.highlightRemovedLabel); 

                        triggerOriginalChange(optionId, 'drop'); 

                }

                function dropListItemHide($item) {

                        // remove the currently visible item with optional animation
                        // used only by dropListItem()

                        if(options.animate && !buildingSelect) {

                                $prevItem = $item.prev("li");

                                $item.animate({
                                        opacity: "hide",
                                        height: "hide"
                                }, 100, "linear", function() {
                                        $prevItem.animate({
                                                height: "-=2px"
                                        }, 50, "swing", function() {
                                                $prevItem.animate({
                                                        height: "+=2px"
                                                }, 100, "swing"); 
                                        }); 
                                        $item.remove(); 
                                }); 

                        } else {
                                $item.remove(); 
                        }
                }

                function setHighlight($item, label) {

                        // set the contents of the highlight area that appears
                        // directly after the <select> single
                        // fade it in quickly, then fade it out

                        if(!options.highlight) return; 

                        $select.next("#" + options.highlightClass + index).remove();

                        var $highlight = $("<span></span>")
                                .hide()
                                .addClass(options.highlightClass)
                                .attr('id', options.highlightClass + index)
                                .html(label + $item.children("." + options.listItemLabelClass).slice(0,1).text()); 

                        $select.after($highlight); 

                        $highlight.fadeIn("fast", function() {
                                setTimeout(function() { $highlight.fadeOut("slow"); }, 50); 
                        }); 
                }

                function triggerOriginalChange(optionId, type) {

                        // trigger a change event on the original select multiple
                        // so that other scripts can pick them up

                        ignoreOriginalChangeEvent = true; 
                        $option = $("#" + optionId); 

                        $original.trigger('change', [{
                                'option': $option,
                                'value': $option.val(),
                                'id': optionId,
                                'item': $ol.children("[rel=" + optionId + "]"),
                                'type': type
                        }]); 
                }

                init();
        });
};

})(jQuery);