/*
 * 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;
    //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() {
		$container.toggle();
	})
	.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 {
	    	hideMe();
	        // 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;
        $container.hide();
    }

    function init() {
        $container.append(getSelectOptions($input.attr('id'))).hide();
        var width = $input.css('width');
        if ($container.height() > opt.maxHeight) {
            $container.width(parseInt(width) + parseInt($input.css('paddingRight')) + parseInt($input.css('paddingLeft')));
            $container.height(opt.maxHeight);
        } else $container.width(width);
    }

    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');
        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;
    }

};