/*
 * 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: 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 = 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;
	        $container.show();
	    }
	})
	.keydown(function(event) {
	    switch (event.keyCode) {
	        case 38: // up
	            event.preventDefault();
	            moveSelect(-1);
	            break;
	        case 40: // down
	            event.preventDefault();
	            moveSelect(1);
	            break;
	        //case 9:  // tab         
	        case 13: // return
	            event.preventDefault(); // seems not working in mac !
	            jQuery('li.' + opt.hoverClass).trigger('click');
	            break;
	        case 27: //escape
	            hideMe();
	            break;
	    }
	})
	.blur(function() {
	    if ($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 || $.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 = jQuery(container);
        $container.attr('id', elm_id + '_container');
        $container.addClass(options.containerClass);

        return $container;
    }

    function setupInput(options) {
        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

        return $input;
    }

    function moveSelect(step) {
        var lis = jQuery("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);

        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];
        var s = jQuery(selectobj);
        s.val(el);
        $input.val(jQuery(li).text());
        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');

        var num = $select.children().length;

        $select.children().each(function() {
            if (this.tagName == 'OPTGROUP') {
                $group = jQuery(this);
                var li = document.createElement('li');
                li.innerHTML = this.label;
                jQuery(li).addClass("group");
                ul.appendChild(li);

                var innernum = $group.children().length;
                var innerindex = 0;
                $group.children().each(function() {
                    ++innerindex;
                    var li = document.createElement('li');
                    li.setAttribute('id', parentid + '_' + jQuery(this).val());
                    li.innerHTML = jQuery(this).text()
                    if (jQuery(this).is(':selected')) {
                        $input.val(jQuery(this).text());
                        jQuery(li).addClass(opt.currentClass);
                    }
                    if (innerindex == innernum) {
                        jQuery(li).addClass("last");
                    }
                    ul.appendChild(li);
                    jQuery(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 = jQuery('li.' + opt.hoverClass, $container).get(0);
			            if (opt.debug) console.log('click on :' + this.id);
			            jQuery('li.' + opt.currentClass).removeClass(opt.currentClass);
			            jQuery(this).addClass(opt.currentClass);
			            setCurrent();
			            hideMe();
			        });
                });

            }
            else {
                if (jQuery(this).val()) {
                    var li = document.createElement('li');
                    li.setAttribute('id', parentid + '_' + jQuery(this).val());
                    li.innerHTML = jQuery(this).text()
                    if (jQuery(this).is(':selected')) {
                        $input.val(jQuery(this).text());
                        jQuery(li).addClass(opt.currentClass);
                    }
                    if (1 + this.index == num) {
                        jQuery(li).addClass("last");
                    }
                    ul.appendChild(li);
                    jQuery(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 = jQuery('li.' + opt.hoverClass, $container).get(0);
			            if (opt.debug) console.log('click on :' + this.id);
			            jQuery('li.' + opt.currentClass).removeClass(opt.currentClass);
			            jQuery(this).addClass(opt.currentClass);
			            setCurrent();
			            hideMe();
			        });
                }
            }
        });





        $select.children('option').each(function() {

        });

        ul.reset = function() {
            $input.val("");
        };

        selectobj.extended = ul;

        return ul;
    }



};