/*
 * jQuery selectbox plugin
 *
 * Copyright (c) 2007 Sadri Sahraoui (brainfault.com)
 * Licensed under the GPL license:
 *   http://www.gnu.org/licenses/gpl.html
 *
 * The code is inspired from Autocomplete plugin (http://www.dyve.net/jquery/?autocomplete)
 *
 * Revision: $Id$
 * Version: 0.3
 */
jQuery.fn.extend({
        selectbox: function(options) {
                return this.each(function() {
                        new jQuery.SelectBox(this, options);
                });
        }
});

jQuery.SelectBox = function(selectobj, options) {
        
        var opt = options || {};
        opt.inputClass = opt.inputClass || "selectbox";
        opt.containerClass = opt.containerClass || "selectbox-wrapper";
        opt.hoverClass = opt.hoverClass || "selected";
        opt.debug = opt.debug || false;
        
        var elm_id = selectobj.id;
        var active = -1;
        var inFocus = false;
        var hasfocus = 0;
        var mouseOverOnContainer = false;        
        //jquery object for select element
        var $select = $(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;
               $container.show();
           }
        })
        .keydown(function(event) {         
                switch(event.keyCode) {
                        case 38: // up
                                event.preventDefault();
                                moveSelect(-1);
                                break;
                        case 40: // down
                                event.preventDefault();
                                moveSelect(1);
                                break;
                        //case 9:  // tab 
                        case 13: // return
                                event.preventDefault(); // seems not working in mac !
                                setCurrent();
                                hideMe();
                                break;
                }
        })
        .blur(function() {
                if ($container.is(':visible') && (hasfocus > 0 || mouseOverOnContainer)) {
                        if(opt.debug) console.log('container visible and has focus')
                } else {
                        hideMe();       
                }
        });


        function hideMe() { 
                hasfocus = 0;
                $container.hide(); 
        }
        
        function init() {
                $container.append(getSelectOptions()).hide();
                var width = $input.width();
				if( width > $container.width() ) {
					//alert($input.width() + ' ' + $container.width());
	                $container.width(width); 
				}
    }
        
        function setupContainer(options) {
                var container = document.createElement("div");
                $container = $(container);
                $container.attr('id', elm_id+'_container');
                $container.addClass(options.containerClass);
                $container.mouseover(function(){mouseOverOnContainer = true; });
                $container.mouseout(function(){mouseOverOnContainer = false; });
                //return focus to input, because blur should work
                                        $container.scroll(function(){$input.focus();}); 
       
                return $container;
        }
        
        function setupInput(options) {
                var input = document.createElement("input");
                var $input = $(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

                // move classes from selectbox to input
                //alert($select.attr('class'));
                if(typeof($select.attr('class')) != 'undefined'){
                  var str = $select.attr('class');
                  var each_class = str.split(' ');
                  for(var i = 0; i<=each_class.length; i++)
                    $input.addClass(each_class[i]);
                }

                
                return $input;  
        }
        
        function moveSelect(step) {
                var lis = $("li", $container);
                if (!lis) return;

                active += step;

                if (active < 0) {
                        active = 0;
                } else if (active >= lis.size()) {
                        active = lis.size() - 1;
                }

                lis.removeClass(opt.hoverClass);

                $(lis[active]).addClass(opt.hoverClass);
        }
        
        function setCurrent() {
                var li = $("li."+opt.hoverClass, $container).get(0);
                var el = li.id;
                $select.val(el);
                $select.change();
                $input.val($(li).text());
//                $input.val($(li).html());
                return true;
        }
        
        // select value
        function getCurrentSelected() {
                return $select.val();
        }
        
        // input value
        function getCurrentValue() {
                return $input.val();
        }
        
        function getSelectOptions() {
                var select_options = new Array();
                var ul = document.createElement('ul');
                $select.children('option').each(function() {
                        var li = document.createElement('li');
                        li.setAttribute('id', $(this).val());
                        li.innerHTML = $(this).html();
                        if ($(this).is(':selected')) {
                                $input.val($(this).text());
                                //$input.val($(this).html());
                                $(li).addClass(opt.hoverClass);
                        }
                        ul.appendChild(li);
                        $(li)
                        .mouseover(function(event) {
                                hasfocus = 1;
                                if (opt.debug) console.log('out 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) {
                                if (opt.debug) console.log('click on :'+this.id);
                                $('LI', $container).removeClass(opt.hoverClass);
                                $(this).addClass(opt.hoverClass);
                                setCurrent();
                                hideMe();
                        });
                });
                return ul;
        }
        
};