/*
 * 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: 1.0
 *
 * Changelog :
 *  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) {
		var zindex = 100;
		return this.each(function() {
			new jQuery.SelectBox(this, options, zindex);
			zindex--;
		});
	}
});


/* pawel maziarz: work around for ie logging */
if (!window.console) {
	var console = {
		log: function(msg) {
	 }
	}
}
/* */

jQuery.SelectBox = function(selectobj, options, zindex) {

	var opt = options || {};
	opt.inputClass = opt.inputClass || "selectbox";
	opt.containerClass = opt.containerClass || "selectbox-wrapper";
	opt.hoverClass = opt.hoverClass || "current";
	opt.currentClass = opt.currentClass || "selected";
        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;
	var hideOnClick = false;
        var create_wrapper = true;
	//jquery object for select element
	var $select = jQuery(selectobj);
	// jquery container object
	var $container = setupContainer(opt);
	//jquery input object
	var $input = setupInput(opt);
	//warp the select in a div with descending z-index
	var $input_container = jQuery(document.createElement("div"));
	$input_container.attr('class','selectbox_element');
	$input_container.append($input);
        if (create_wrapper == true) {
            $select.wrap('<div class="select_wrapper" id="'+elm_id+'_wrapper" style="z-index:'+zindex+'"></div>');
        }
        // hide select and append newly created elements
	$select.hide().before($input).before($container);


	init();

	var fn = $select.attr('onchange');

	$input
	.click(function(){
    	if (!inFocus || hideOnClick) {
		  	$container.toggle();
		}
		hideOnClick = true;
	})
	.focus(function(){
	   if ($container.not(':visible')) {
	       inFocus = true;
	       hideOnClick = false;
	       $container.show();
               //$container.focus();
	   }
	})
	.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 {
		// Workaround for ie scroll - thanks to Bernd Matzner
                if(jQuery.browser.msie || jQuery.browser.safari){ // check for safari too - workaround for webkit
                    if(document.activeElement.getAttribute('id').indexOf('_container')==-1){
                        hideMe();
                    } else {
                        //$input.focus();
                    }
                } else {
                    hideMe();
                }
            }
	});

	$container
	.blur(function() { 
            if ($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 || jQuery.browser.safari){ // check for safari too - workaround for webkit
                    if(document.activeElement.getAttribute('id').indexOf('_search_wrapper')==-1){
                        hideMe();
                    } else {
                        //$input.focus();
                    }
                } else {
                    hideMe();
                }
            }
	});

	function hideMe() {
		hasfocus = 0;
		$container.hide();
	}

	function init() {
		$container.append(getSelectOptions($input.attr('id'))).hide();
                var input_width = $input.css('width');
		var width = parseInt(input_width) + 39;
		width = (width) ? width+'px' : input_width;
		$container.width(width);
    }

	function setupContainer(options) {
		// first remove existing container with the corresponding id
		var $existing_container = $select.parent().find('#'+elm_id+'_container');
		if ($existing_container.length != 0) {
			create_wrapper = false;
                        $existing_container.remove();
		}
		// add a new container
		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) {
		// first remove existing input with the corresponding id
		var $existing_input = $select.parent().find('#'+elm_id+'_input');
		if ($existing_input.length != 0) {
			$existing_input.remove();
		}
		// add a new input
		var input = document.createElement("div");
		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;
		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, $container).get(0);
		var ar = (''+li.id).split('_');
		var el = ar[ar.length-1];
		//$select.val(el);
                $select.get(0).selectedIndex = $('li', $container).index(li);
                //$input.val($(li).text());
                $input.text($(li).text());

		//execute onchange event of the select
		fn ? fn() : '';
                // save that changes are made in form
                update_changes_made();

                opt.onChangeParams = { selectedVal : $select.val() };
                if (opt.onChangeCallback) opt.onChangeCallback(opt.onChangeParams);
                    return true;
                }

	// select value
	function getCurrentSelected() {
		return $select.val();
	}

	// input value
	function getCurrentValue() {
		//return $input.val();
                return $input.text();
	}

	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).text());
                                $input.text($(this).text());
				$(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.change();
				$select.get(0).blur();
				hideMe();
			});
		});
		return ul;
	}



};