/*
 * jQuery selectbox plugin
 *
 * Copyright (c) 2007 Sadri Sahraoui (brainfault.com)
 * Licensed under the GPL license and MIT:
 *   http://www.opensource.org/licenses/GPL-license.php
 *   http://www.opensource.org/licenses/mit-license.php
 *
 * The code is inspired from Autocomplete plugin (http://www.dyve.net/jquery/?autocomplete)
 *
 * Revision: $Id: jquery.selectbox-0.6.js 283 2009-05-04 02:27:23Z nnguyen $
 * Version: 0.6
 * 
 * Changelog :
 *  Version 0.6
 *  - Fix IE scrolling problem
 *  Version 0.5 
 *  - separate css style for current selected element and hover element which solve the highlight issue 
 *  Version 0.4
 *  - Fix width when the select is in a hidden div   @Pawel Maziarz
 *  - Add a unique id for generated li to avoid conflict with other selects and empty values @Pawel Maziarz
 */
jQuery.fn.extend({
        selectbox: function(options) {
                return this.each(function() {
                        new jQuery.SelectBox(this, options);
                });
        }
});


/* pawel maziarz: work around for ie logging */
if (!window.console) {
        var console = {
                log: function(msg) { 
         }
        }
}
/* */

jQuery.SelectBox = function(selectobj, options) {

        var opt = options || {};
        opt.inputClass = opt.inputClass || "selectbox";
        opt.containerClass = opt.containerClass || "selectbox-wrapper";
        opt.hoverClass = opt.hoverClass || "current";
        opt.currentClass = opt.selectedClass || "selected"
        opt.debug = opt.debug || false;

        var elm_id = selectobj.id;
        var active = 0;
        var inFocus = false;
        var hasfocus = 0;
        //jquery object for select element
        var $select = JQ(selectobj);
        // jquery container object
        var $container = setupContainer(opt);
        //jquery input object 
        var $input = setupInput(opt);
        // hide select and append newly created elements
        $select.hide().before($input).before($container);


        init();

        $input
        .click(function(){
    if (!inFocus) {
                  $container.toggle();
                }
        })
        .focus(function(){
           if ($container.not(':visible')) {
               inFocus = true;
               $container.show();
           }
        })
        .keydown(function(event) {         
                switch(event.keyCode) {
                        case 38: // up
                                event.preventDefault();
                                moveSelect(-1);
                                break;
                        case 40: // down
                                event.preventDefault();
                                moveSelect(1);
                                break;
                        //case 9:  // tab 
                        case 13: // return
                                event.preventDefault(); // seems not working in mac !
                                JQ('li.'+opt.hoverClass).trigger('click');
                                break;
                        case 27: //escape
                          hideMe();
                          break;
                }
        })
        .blur(function() {
                if ($container.is(':visible') && hasfocus > 0 ) {
                        if(opt.debug) console.log('container visible and has focus')
                } else {
                  // Workaround for ie scroll - thanks to Bernd Matzner
                  if($.browser.msie || $.browser.safari){ // check for safari too - workaround for webkit
        if(document.activeElement.getAttribute('id').indexOf('_container')==-1){
          hideMe();
        } else {
          $input.focus();
        }
      } else {
        hideMe();
      }
                }
        });


        function hideMe() { 
                hasfocus = 0;
                $container.hide(); 
        }

        function init() {
                $container.append(getSelectOptions($input.attr('id'))).hide();
                var width = $input.css('width');
                $container.width(width);
    }

        function setupContainer(options) {
                var container = document.createElement("div");
                $container = JQ(container);
                $container.attr('id', elm_id+'_container');
                $container.addClass(options.containerClass);

                return $container;
        }

        function setupInput(options) {
                var input = document.createElement("input");
                var $input = JQ(input);
                $input.attr("id", elm_id+"_input");
                $input.attr("type", "text");
                $input.addClass(options.inputClass);
                $input.attr("autocomplete", "off");
                $input.attr("readonly", "readonly");
                $input.attr("tabIndex", $select.attr("tabindex")); // "I" capital is important for ie

                return $input;
        }

        function moveSelect(step) {
                var lis = JQ("li", $container);
                if (!lis || lis.length == 0) return false;
                active += step;
    //loop through list
                if (active < 0) {
                        active = lis.size();
                } else if (active > lis.size()) {
                        active = 0;
                }
    scroll(lis, active);
                lis.removeClass(opt.hoverClass);

                JQ(lis[active]).addClass(opt.hoverClass);
        }

        function scroll(list, active) {
      var el = JQ(list[active]).get(0);
      var list = $container.get(0);
      
      if (el.offsetTop + el.offsetHeight > list.scrollTop + list.clientHeight) {
        list.scrollTop = el.offsetTop + el.offsetHeight - list.clientHeight;  
      } else if(el.offsetTop < list.scrollTop) {
        list.scrollTop = el.offsetTop;
      }
        }

        function setCurrent() {
                var li = JQ("li."+opt.currentClass, $container).get(0);
                var ar = (''+li.id).split('_');
                var el = ar[ar.length-1];
                $select.val(el);
                $input.val(JQ(li).html());
                return true;
        }

        // select value
        function getCurrentSelected() {
                return $select.val();
        }

        // input value
        function getCurrentValue() {
                return $input.val();
        }

        function getSelectOptions(parentid) {
                var select_options = new Array();
                var ul = document.createElement('ul');
                $select.children('option').each(function() {
                        var li = document.createElement('li');
                        li.setAttribute('id', parentid + '_' + JQ(this).val());
                        li.innerHTML = JQ(this).html();
                        if (JQ(this).is(':selected')) {
                                $input.val(JQ(this).html());
                                JQ(li).addClass(opt.currentClass);
                        }
                        ul.appendChild(li);
                        JQ(li)
                        .mouseover(function(event) {
                                hasfocus = 1;
                                if (opt.debug) console.log('over on : '+this.id);
                                jQuery(event.target, $container).addClass(opt.hoverClass);
                        })
                        .mouseout(function(event) {
                                hasfocus = -1;
                                if (opt.debug) console.log('out on : '+this.id);
                                jQuery(event.target, $container).removeClass(opt.hoverClass);
                        })
                        .click(function(event) {
                          var fl = JQ('li.'+opt.hoverClass, $container).get(0);
                                if (opt.debug) console.log('click on :'+this.id);
                                JQ('li.'+opt.currentClass).removeClass(opt.currentClass); 
                                JQ(this).addClass(opt.currentClass);
                                setCurrent();
                                //$select.change();
                                $select.get(0).blur();
                                hideMe();
                        });
                });
                return ul;
        }

};