!function($) {
    var selectpicker = function(element, options, e) {
        if (e ) {
            e.stoppropagation();
            e.preventdefault();
        }
        this.$element = $(element);
        this.$newelement = null;
        this.button = null;

        //merge defaults, options and data-attributes to make our options
        this.options = $.extend({}, $.fn.selectpicker.defaults, this.$element.data(), typeof options == 'object' && options);

        //if we have no title yet, check the attribute 'title' (this is missed by jq as its not a data-attribute
        if(this.options.title==null)
            this.options.title = this.$element.attr('title');

        //expose public methods
        this.val = selectpicker.prototype.val;
        this.render = selectpicker.prototype.render;
        this.init();
    };

    selectpicker.prototype = {

        constructor: selectpicker,

        init: function (e) {
            var _this = this;
            this.$element.hide();
            this.multiple = this.$element.prop('multiple');


            var classlist = this.$element.attr('class') !== undefined ? this.$element.attr('class').split(/\s+/) : '';
            var id = this.$element.attr('id');
            this.$element.after( this.createview() );
            this.$newelement = this.$element.next('.select');
            var select = this.$newelement;
            var menu = this.$newelement.find('.dropdown-menu');
            var menuarrow = this.$newelement.find('.dropdown-arrow');
            var menua = menu.find('li > a');
            var liheight = select.addclass('open').find('.dropdown-menu li > a').outerheight();
            select.removeclass('open');
            var divheight = menu.find('li .divider').outerheight(true);
            var selectoffset_top = this.$newelement.offset().top;
            var size = 0;
            var menuheight = 0;
            var selectheight = this.$newelement.outerheight();
            this.button = this.$newelement.find('> button');
            if (id !== undefined) {
                this.button.attr('id', id);
                $('label[for="' + id + '"]').click(function(){ select.find('button#'+id).focus(); })
            }
            for (var i = 0; i < classlist.length; i++) {
                if(classlist[i] != 'selectpicker') {
                    this.$newelement.addclass(classlist[i]);
                }
            }
            //if we are multiple, then add the show-tick class by default
            if(this.multiple) {
                 this.$newelement.addclass('select-multiple');
            }
            this.button.addclass(this.options.style);
            menu.addclass(this.options.menustyle);
            menuarrow.addclass(function() {
                if (_this.options.menustyle) {
                    return _this.options.menustyle.replace('dropdown-', 'dropdown-arrow-');
                }
            });
            this.checkdisabled();
            this.checktabindex();
            this.clicklistener();
            var menupadding = parseint(menu.css('padding-top')) + parseint(menu.css('padding-bottom')) + parseint(menu.css('border-top-width')) + parseint(menu.css('border-bottom-width'));
            if (this.options.size == 'auto') {
                function getsize() {
                    var selectoffset_top_scroll = selectoffset_top - $(window).scrolltop();
                    var windowheight = $(window).innerheight();
                    var menuextras = menupadding + parseint(menu.css('margin-top')) + parseint(menu.css('margin-bottom')) + 2;
                    var selectoffset_bot = windowheight - selectoffset_top_scroll - selectheight - menuextras;
                    menuheight = selectoffset_bot;
                    if (select.hasclass('dropup')) {
                        menuheight = selectoffset_top_scroll - menuextras;
                    }
                    menu.css({'max-height' : menuheight + 'px', 'overflow-y' : 'auto', 'min-height' : liheight*3 + 'px'});
            }
                getsize();
                $(window).resize(getsize);
                $(window).scroll(getsize);
                if (window.mutationobserver) {
                    new mutationobserver(getsize).observe(this.$element.get(0), {
                        childlist: true
                    });
                } else {
                    this.$element.bind('domnodeinserted', getsize);
                }
            } else if (this.options.size && this.options.size != 'auto' && menu.find('li').length > this.options.size) {
                var optindex = menu.find("li > *").filter(':not(.divider)').slice(0,this.options.size).last().parent().index();
                var divlength = menu.find("li").slice(0,optindex + 1).find('.divider').length;
                menuheight = liheight*this.options.size + divlength*divheight + menupadding;
                menu.css({'max-height' : menuheight + 'px', 'overflow-y' : 'scroll'});
            }

            // listen for updates to the dom and re render... (use mutation observer when availiable)
            if (window.mutationobserver) {
                new mutationobserver($.proxy(this.reloadli, this)).observe(this.$element.get(0), {
                    childlist: true
                });
            } else {
                this.$element.bind('domnodeinserted', $.proxy(this.reloadli, this));
            }

            this.render();
        },

        createdropdown: function() {
            var drop =
                "<div class='btn-group select'>" +                    
                    "<button class='btn dropdown-toggle clearfix' data-toggle='dropdown'>" +
                        "<span class='filter-option pull-left'></span>&nbsp;" +
                        "<span class='caret'></span>" +
                    "</button>" +
                    "<span class='dropdown-arrow'></span>" +
                    "<ul class='dropdown-menu' role='menu'>" +
                    "</ul>" +
                "</div>";

            return $(drop);
        },


        createview: function() {
            var $drop = this.createdropdown();
            var $li = this.createli();
            $drop.find('ul').append($li);
            return $drop;
        },

        reloadli: function() {
            //remove all children.
            this.destroyli();
            //re build
            $li = this.createli();
            this.$newelement.find('ul').append( $li );
            //render view
            this.render();
        },

        destroyli:function() {
            this.$newelement.find('li').remove();
        },

        createli: function() {

            var _this = this;
            var _li = [];
            var _lia = [];
            var _lihtml = '';

            this.$element.find('option').each(function(){
                _li.push($(this).text());
            });

            this.$element.find('option').each(function(index) {
                //get the class and text for the option
                var optionclass = $(this).attr("class") !== undefined ? $(this).attr("class") : '';
               	var text =  $(this).text();
               	var subtext = $(this).data('subtext') !== undefined ? '<small class="muted">'+$(this).data('subtext')+'</small>' : '';

                //append any subtext to the main text.
                text+=subtext;

                if ($(this).parent().is('optgroup') && $(this).data('divider') != true) {
                    if ($(this).index() == 0) {
                        //get the opt group label
                        var label = $(this).parent().attr('label');
                        var labelsubtext = $(this).parent().data('subtext') !== undefined ? '<small class="muted">'+$(this).parent().data('subtext')+'</small>' : '';
                        label += labelsubtext;

                        if ($(this)[0].index != 0) {
                            _lia.push(
                                '<div class="divider"></div>'+
                                '<dt>'+label+'</dt>'+ 
                                _this.createa(text, "opt " + optionclass )
                                );
                        } else {
                            _lia.push(
                                '<dt>'+label+'</dt>'+ 
                                _this.createa(text, "opt " + optionclass ));
                        }
                    } else {
                         _lia.push( _this.createa(text, "opt " + optionclass )  );
                    }
                } else if ($(this).data('divider') == true) {
                    _lia.push('<div class="divider"></div>');
                } else if ($(this).data('hidden') == true) {
	                _lia.push('');
                } else {
                    _lia.push( _this.createa(text, optionclass ) );
                }
            });

            if (_li.length > 0) {
                for (var i = 0; i < _li.length; i++) {
                    var $option = this.$element.find('option').eq(i);
                    _lihtml += "<li rel=" + i + ">" + _lia[i] + "</li>";
                }
            }

            //if we dont have a selected item, and we dont have a title, select the first element so something is set in the button
            if(this.$element.find('option:selected').length==0 && !_this.options.title) {
                this.$element.find('option').eq(0).prop('selected', true).attr('selected', 'selected');
            }

            return $(_lihtml);
        },

        createa:function(test, classes) {
         return '<a tabindex="-1" href="#" class="'+classes+'">' +
                 '<span class="pull-left">' + test + '</span>' +
                 '</a>';

        },

         render:function() {
            var _this = this;

            //set width of select
             if (this.options.width == 'auto') {
                 var ulwidth = this.$newelement.find('.dropdown-menu').css('width');
                 this.$newelement.css('width',ulwidth);
             } else if (this.options.width && this.options.width != 'auto') {
                 this.$newelement.css('width',this.options.width);
             }

            //update the li to match the select
            this.$element.find('option').each(function(index) {
               _this.setdisabled(index, $(this).is(':disabled') || $(this).parent().is(':disabled') );
               _this.setselected(index, $(this).is(':selected') );
            });



            var selecteditems = this.$element.find('option:selected').map(function(index,value) {
                if($(this).attr('title')!=undefined) {
                    return $(this).attr('title');
                } else {
                    return $(this).text();
                }
            }).toarray();

            //convert all the values into a comma delimited string    
            var title = selecteditems.join(", ");

            //if this is multi select, and the selecttext type is count, the show 1 of 2 selected etc..                    
            if(_this.multiple && _this.options.selectedtextformat.indexof('count') > -1) {
                var max = _this.options.selectedtextformat.split(">");
                if( (max.length>1 && selecteditems.length > max[1]) || (max.length==1 && selecteditems.length>=2)) {
                    title = selecteditems.length +' of ' + this.$element.find('option').length + ' selected';
                }
             }  
            
            //if we dont have a title, then use the default, or if nothing is set at all, use the not selected text
            if(!title) {
                title = _this.options.title != undefined ? _this.options.title : _this.options.noneselectedtext;    
            }
            
            this.$element.next('.select').find('.filter-option').html( title );
	    },
	    
        
        
        setselected:function(index, selected) {
            if(selected) {
                this.$newelement.find('li').eq(index).addclass('selected');
            } else {
                this.$newelement.find('li').eq(index).removeclass('selected');
            }
        },
        
        setdisabled:function(index, disabled) {
            if(disabled) {
                this.$newelement.find('li').eq(index).addclass('disabled');
            } else {
                this.$newelement.find('li').eq(index).removeclass('disabled');
            }
        },
       
        checkdisabled: function() {
            if (this.$element.is(':disabled')) {
                this.button.addclass('disabled');
                this.button.click(function(e) {
                    e.preventdefault();
                });
            }
        },
		
		checktabindex: function() {
			if (this.$element.is('[tabindex]')) {
				var tabindex = this.$element.attr("tabindex");
				this.button.attr('tabindex', tabindex);
			}
		},
		
		clicklistener: function() {
            var _this = this;
            
            $('body').on('touchstart.dropdown', '.dropdown-menu', function (e) { e.stoppropagation(); });
            
           
            
            this.$newelement.on('click', 'li a', function(e){
                var clickedindex = $(this).parent().index(),
                    $this = $(this).parent(),
                    $select = $this.parents('.select');
                
                
                //dont close on multi choice menu    
                if(_this.multiple) {
                    e.stoppropagation();
                }
                
                e.preventdefault();
                
                //dont run if we have been disabled
                if ($select.prev('select').not(':disabled') && !$(this).parent().hasclass('disabled')){
                    //deselect all others if not multi select box
                    if (!_this.multiple) {
                        $select.prev('select').find('option').removeattr('selected');
                        $select.prev('select').find('option').eq(clickedindex).prop('selected', true).attr('selected', 'selected');
                    } 
                    //else toggle the one we have chosen if we are multi selet.
                    else {
                        var selected = $select.prev('select').find('option').eq(clickedindex).prop('selected');
                        
                        if(selected) {
                            $select.prev('select').find('option').eq(clickedindex).removeattr('selected');
                        } else {
                            $select.prev('select').find('option').eq(clickedindex).prop('selected', true).attr('selected', 'selected');
                        }
                    }
                    
                    
                    $select.find('.filter-option').html($this.text());
                    $select.find('button').focus();

                    // trigger select 'change'
                    $select.prev('select').trigger('change');
                }

            });
            
           this.$newelement.on('click', 'li.disabled a, li dt, li .divider', function(e) {
                e.preventdefault();
                e.stoppropagation();
                $select = $(this).parent().parents('.select');
                $select.find('button').focus();
            });

            this.$element.on('change', function(e) {
                _this.render();
            });
        },
        
        val:function(value) {
            
            if(value!=undefined) {
                this.$element.val( value );
                
                this.$element.trigger('change');
                return this.$element;
            } else {
                return this.$element.val();
            }
        }

    };

    $.fn.selectpicker = function(option, event) {
       //get the args of the outer function..
       var args = arguments;
       var value;
       var chain = this.each(function () {
            var $this = $(this),
                data = $this.data('selectpicker'),
                options = typeof option == 'object' && option;
            
            if (!data) {
            	$this.data('selectpicker', (data = new selectpicker(this, options, event)));
            } else {
            	for(var i in option) {
            		data[i]=option[i];
            	}
            }
            
            if (typeof option == 'string') {
                //copy the value of option, as once we shift the arguments
                //it also shifts the value of option.
                property = option;
                if(data[property] instanceof function) {
                    [].shift.apply(args);
                    value = data[property].apply(data, args);
                } else {
                    value = data[property];
                }
            }
        });
        
        if(value!=undefined) {
            return value;
        } else {
            return chain;
        } 
    };

    $.fn.selectpicker.defaults = {
        style: null,
        size: 'auto',
        title: null,
        selectedtextformat : 'values',
        noneselectedtext : 'nothing selected',
        width: null,
        menustyle: null,
        togglesize: null
    }

}(window.jquery);