/*
 * 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: $Id$
 * Version: 1.2
 * 
 * Changelog :
 *  Version 1.2 By Guillaume Vergnolle (web-opensource.com)
 *  - Add optgroup support
 *  - possibility to choose between span or input as replacement of the select box
 *  - support for jquery change event
 *  - add a max height option for drop down list
 *  Version 1.1 
 *  - Fix IE bug
 *  Version 1.0
 *  - Support jQuery noConflict option
 *  - Add callback for onChange event, thanks to Jason
 *  - Fix IE8 support
 *  - Fix auto width support
 *  - Fix focus on firefox dont show the carret
 *  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.inputType = opt.inputType || "input";
        opt.inputClass = opt.inputClass || "selectbox";
        opt.containerClass = opt.containerClass || "selectbox-wrapper";
        opt.hoverClass = opt.hoverClass || "current";
        opt.currentClass = opt.currentClass || "selected";
        opt.groupClass = opt.groupClass || "groupname"; //css class for group
        opt.maxHeight = opt.maxHeight || 200; // max height of dropdown list
        opt.loopnoStep = opt.loopnoStep || false; // to remove the step in list moves loop
        opt.onChangeCallback = opt.onChangeCallback || false;
        opt.onChangeParams = opt.onChangeParams || false;
        opt.debug = opt.debug || false;
        
        var elm_id = selectobj.id;
        var active = 0;
        var inFocus = false;
        var hasfocus = 0;
        var $the_list=null;
        //jquery object for select element
        var $select = jQuery(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;
                        $the_list.remove();
                        $container.append(getSelectOptions($input.attr('id')));
                        $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 !
                                $('li.'+opt.hoverClass).trigger('click');
                                break;
                        case 27: //escape
                          hideMe();
                          break;
                }
        })
        .blur(function() {
                if ($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((jQuery.browser.msie && jQuery.browser.version.substr(0,1) < 8) || jQuery.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;
                $the_list.remove();
                $container.hide(); 
        }
        
        function init() {
                $container.append(getSelectOptions($input.attr('id'))).hide();
                var width = $input.css('width');
                var height = $input.css('height');
                
        }
        
        function setupContainer(options) {
                var container = document.createElement("div");
                $container = jQuery(container);
                $container.attr('id', elm_id+'_container');
                $container.addClass(options.containerClass);
                $container.css('display', 'none');
                
                return $container;
        }
        
        function setupInput(options) {
                if(opt.inputType == "span"){
                        var input = document.createElement("span");
                        var $input = jQuery(input);
                        $input.attr("id", elm_id+"_input");
                        $input.addClass(options.inputClass);
                        $input.attr("tabIndex", $select.attr("tabindex"));
                } else {
                        var input = document.createElement("input");
                        var $input = jQuery(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
                        $input.css("width", $select.css("width"));
                }
                return $input;  
        }
        
        function moveSelect(step) {
                var lis = jQuery("li", $container);
                if (!lis || lis.length == 0) return false;
                // find the first non-group (first option)
                firstchoice = 0;
                while($(lis[firstchoice]).hasClass(opt.groupClass)) firstchoice++;
                active += step;
                // if we are on a group step one more time
                if($(lis[active]).hasClass(opt.groupClass)) active += step;
                //loop through list from the first possible option
                if (active < firstchoice) {
                        (opt.loopnoStep ? active = lis.size()-1 : active = lis.size() );
                } else if (opt.loopnoStep && active > lis.size()-1) {
                        active = firstchoice;
                } else if (active > lis.size()) {
                        active = firstchoice;
                }
                scroll(lis, active);
                lis.removeClass(opt.hoverClass);

                jQuery(lis[active]).addClass(opt.hoverClass);
        }
        
        function scroll(list, active) {
                var el = jQuery(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 = jQuery("li."+opt.currentClass, $container).get(0);
                var ar = (''+li.id).split('_');
                var el = ar[ar.length-1];
                if (opt.onChangeCallback){
                        $select.get(0).selectedIndex = $('li', $container).index(li);
                        opt.onChangeParams = { selectedVal : $select.val() };
                        opt.onChangeCallback(opt.onChangeParams);
                } else {
                        $select.val(el);
                        $select.change();
                }
                if(opt.inputType == 'span') $input.html($(li).html());
                else $input.val($(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');
                ul.setAttribute('id', "the_list");
                $the_list=jQuery(ul);
                select_options = $select.children('option');
                if(select_options.length == 0) {
                        var select_optgroups = new Array();
                        select_optgroups = $select.children('optgroup');
                        for(x=0;x<select_optgroups.length;x++){
                                select_options = $("#"+select_optgroups[x].id).children('option');
                                var li = document.createElement('li');
                                li.setAttribute('id', parentid + '_' + $(this).val());
                                li.innerHTML = $("#"+select_optgroups[x].id).attr('label');
                                li.className = opt.groupClass;
                                ul.appendChild(li);
                                select_options.each(function() {
                                        var li = document.createElement('li');
                                        li.setAttribute('id', parentid + '_' + $(this).val());
                                        li.innerHTML = $(this).html();
                                        if ($(this).is(':selected')) {
                                                $input.html($(this).html());
                                                $(li).addClass(opt.currentClass);
                                        }
                                        ul.appendChild(li);
                                        $(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 = $('li.'+opt.hoverClass, $container).get(0);
                                                if (opt.debug) console.log('click on :'+this.id);
                                                $('li.'+opt.currentClass, $container).removeClass(opt.currentClass); 
                                                $(this).addClass(opt.currentClass);
                                                setCurrent();
                                                $select.get(0).blur();
                                                hideMe();
                                        });
                                });
                        }
                } else select_options.each(function() {
                        var li = document.createElement('li');
                        li.setAttribute('id', parentid + '_' + $(this).val());
                        li.innerHTML = $(this).html();
                        if ($(this).is(':selected')) {
                                $input.val($(this).html());
                                $(li).addClass(opt.currentClass);
                        }
                        ul.appendChild(li);
                        $(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 = $('li.'+opt.hoverClass, $container).get(0);
                                if (opt.debug) console.log('click on :'+this.id);
                                $('li.'+opt.currentClass, $container).removeClass(opt.currentClass); 
                                $(this).addClass(opt.currentClass);
                                setCurrent();
                                $select.get(0).blur();
                                hideMe();
                        });
                });
                return ul;
        }
};