/*

 * 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: 0.5
 * 
 * Changelog :
 *  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);

		});

	}

});

/* */


jQuery.SelectBox = function(selectobj, options) {

	

	var opt = options || {};

	opt.listHeight = "10px";
	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 = -1;

	var inFocus = false;

	var hasfocus = 0;

	//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();
	
	
	/* Click on the arrow to open drop down menu*/
	$input.click(function(){
		
		if (!inFocus) {
		  $container.toggle();
		  
		}
	})
	
	// Hide menu again if the user chooses anything
	$container.mouseleave(function() {
		hideMenu();
	})
	

	// show drop down menu
	.focus(function(){

	   if ($container.not(':visible')) {

	       inFocus = true;

	       $container.show();

	   }

	})

	/** 
	 * Hide list elements
	 */
	function hideMenu() { 

		hasfocus = 0;

		inFocus = false;
		
		$container.hide(); 

	}

	function init() {

		// Container containing the ul-list.
		$menuContainer = getSelectOptions($input.attr('id'));
		
		$container.append($menuContainer).hide();
		
		var width = $input.css('width');

		// How many list items does the drop down fill
		var numberOfListElements = $($menuContainer).children('li').length;
		
		// Height of every single list element
		var listElementsHeight = $($menuContainer).children('li').outerHeight();
		
		// calculate the height the drop down list has to be replaced on to of
		// the input field
		var height = (numberOfListElements * listElementsHeight) + 4;
		
		// replace drop down menu on top of the input field
		$($menuContainer).parent().css('top', -height);
		
		$container.width(width);
    }

	function setupContainer(options) {
		
		var container = document.createElement("div");

		$container = $(container);

		$container.attr('id', elm_id+'_container');

		$container.addClass(options.containerClass);

		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")); 

		return $input;	

	}


	function setCurrent() {	

		var li = $("li."+opt.currentClass, $container).get(0);

		var ar = (''+li.id).split('_');

		var el = ar[ar.length-1];

		$select.val(el);
		$input.val($(li).html());
		
		$select.trigger('change');

		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 + '_' + $(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).removeClass(opt.currentClass); 

				$(this).addClass(opt.currentClass);

				setCurrent();

				hideMenu();

			});
		});

		return ul;
	}
};