/*
 * 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;
	opt.bgImageActiv = opt.bgImageActiv || false;
	opt.bgImage = opt.bgImage || false;
	opt.onChangeCallback = opt.onChangeCallback || false;
	opt.inputLength = opt.inputLength || 0;

	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();
	
	
	var focusEvents = 'click';
	if(isIE6()){
		var focusEvents = 'click';	
	}
	
	$input.bind(focusEvents,function(){
		if(isIE6()) {
			if (!inFocus) {
				$container.toggle();
				$input.css("background-image", "url(/media/gfx/"+opt.bgImageActiv+")");
				$input.addClass("selected");
			} else {
				hideMe();
			}
		}
		else
		{
			if (!inFocus) {
				$container.toggle();
			}
		}
	})
	
	if(!isIE6()) {
		$input.bind('focus',function(){
			
		   if ($container.not(':visible')) {
			   if(opt.bgImageActiv) {
					$input.css("background-image", "url(/media/gfx/"+opt.bgImageActiv+")");
			   		$input.addClass("selected");
			   }
		       inFocus = true;
		       $container.show();
		   }
		})
		$input.bind('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;
			}
		})
	}
	$input.bind('blur',function() {
		if ($container.is(':visible') && hasfocus > 0 ) {
			
			if(opt.debug) console.log('container visible and has focus')
		} else {
			hideMe();
			
		}
	});


	function hideMe() {
		//$input.css("background-image", "url(media/gfx/bg_select.png)"); 
		hasfocus = 0;
		$container.hide(); 
		if(opt.bgImage) {
			$input.removeClass("selected");
			$input.css("background-image", "url(/media/gfx/"+opt.bgImage+")");
		}
		if(isIE6()){
			//$(document).pngFix(); 
		}
		
	}
	
	function init() {
		$container.append(getSelectOptions()).hide();
		$select.parent().hover(
				null,
				function(){
					$input.trigger('blur');
				}
		);
		$input.hover(
				function(){
					$input.triggerHandler('focus');
				},
				null
		);
		$container.hover(
				null,
				function(){
					$input.trigger('blur');
				}
		);
    }
	
	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")); // "I" capital is important for ie
		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);
		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.inputLength > 0 && $(li).html().length > opt.inputLength) {
			$input.val($(li).html().substring(0,opt.inputLength) + '...');
		} else {
			$input.val($(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());
			$(li).addClass($(this).attr('class'));
			li.innerHTML = $(this).html();
			if ($(this).is(':selected')) {
				$input.val($(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);
				$(this).addClass(opt.hoverClass);
				setCurrent();
				hideMe();
			});
		});
		return ul;
	}
	
};