/**
 * jQuery Ajax Rater Plugin
 *
 * This rater is based on the code Ritesh Agrawal did. Unfortunatly his CSS and the hover technique breaks in some browsers.
 * So i thought, why not use the best CSS star-rater known to man kind and throw it in the mix.
 * I have used the CSS and technique from Komodo Media since it is stable and tested on many, many browsers.
 *
 * This rater compared, has no cancel button. But i think we can live with that :)
 * To avoid conflicts i have changed the function name.
 * 
 * Licensed under The MIT License
 * 
 * @version     1.0
 * @since       03.01.2007
 * @author      Kjell Bublitz <m3nt0r.de@gmail.com
 * @link        http://www.m3nt0r.de/devel/raterDemo/ Demonstration and Documentation
 * @link        http://php.scripts.psu.edu/rja171/widgets/rating.php Based on Ritesh Agrawal Star Rating System
 * @link        http://komodomedia.com/blog/index.php/2007/01/20/css-star-rating-redux/ The Komodo Media CSS Rater Blogpost
 * @license     http://www.opensource.org/licenses/mit-license.php MIT 
 * @package     jQuery Plugins
 * @subpackage  Rater
 */ 

/**
 * Usage: $('#rating').rater('your_servlet', {style:'basic', maxvalue:5, curvalue:0});
 *  
 * @param url The address you want to post the result to. 
 * @param options The style and value attributes
 *
 * Valid options:
 * ---------------------------------------
 *       style:       'basic', 'inline' OR 'small'
 *       maxvalue:    the maximum value / number of stars
 *       curvalue:    the initial value / selected stars
 */ 
jQuery.fn.rater = function(url, id, idDisp, options)
{
	if(url == null) 
		return;
	
	var raterwidth    = 0;
	var	raterwidthOne = 0;
	var settings = {
		url       : url, // post changes to 
		maxvalue  : 5,   // max number of stars
		curvalue  : 0,   // number of selected stars
		readonly  : 0
	};
	
	if(options) { jQuery.extend(settings, options); };
	jQuery.extend(settings, {cancel: (settings.maxvalue > 1) ? true : false});
	
	var container = jQuery(this);
	jQuery.extend(container, { averageRating: settings.curvalue, url: settings.url });

	if(!settings.style || settings.style == null || settings.style == 'basic') 
	{
		raterwidthOne = 25;
		raterwidth    = settings.maxvalue * raterwidthOne;
		var ratingparent = '<ul class="star-rating" style="width:'+raterwidth+'px">';
	}
	if(settings.style == 'small') 
	{
		raterwidthOne = 10;
		raterwidth    = settings.maxvalue * raterwidthOne;
		var ratingparent = '<ul class="star-rating small-star" style="width:'+raterwidth+'px">';
	}
	//middle
	if(settings.style == 'middle') 
	{
		raterwidthOne = 15;
		raterwidth    = settings.maxvalue * raterwidthOne;
		var ratingparent = '<ul class="star-rating middle-star" style="width:'+raterwidth+'px">';
	}
	//middle end
	if(settings.style == 'inline') 
	{
		raterwidthOne = 10;
		raterwidth    = settings.maxvalue * raterwidthOne;
		var ratingparent = '<span class="inline-rating"><ul class="star-rating small-star" style="width:'+raterwidth+'px">';
	}
	container.append(ratingparent);
	
	// create rater
	var starWidth, starIndex, listitems = '';
	var curvalueWidth = Math.floor(100 / settings.maxvalue * settings.curvalue);
	for(var i = 0; i <= settings.maxvalue ; i++) {
		if (i == 0) {
			listitems+='<li class="current-rating" style="width:'+curvalueWidth+'%;">'+settings.curvalue+'/'+settings.maxvalue+'</li>';
		} else {
			starWidth = Math.floor(100 / settings.maxvalue * i);
			starIndex = (settings.maxvalue - i) + 2;
			if(0 == settings.readonly)
				listitems+='<li class="star"><a href="#'+i+'" title="'+i+'/'+settings.maxvalue +'" style="width:'+starWidth+'%;z-index:'+starIndex+'">'+i+'</a></li>';
		}
	}
	container.find('.star-rating').append(listitems); // i am using find here, because the span wrapped in the small style would break children()

	if(settings.maxvalue > 1) // add a container for the ajax result
	{
		container.append('<span class="star-rating-result"></span>'); 
	}
	
	if(0 == settings.readonly)
	{
		var stars = jQuery(container).find('.star-rating').children('.star');
		stars.click(function()
		{
			if(settings.maxvalue == 1) // on / off
			{
				settings.curvalue = (settings.curvalue == 0) ? 1 : 0;
				jQuery(container).find('.star-rating').children('.current-rating').css({width:(settings.curvalue*100)+'%'});
				
				ratingPOST(container.url, raterValue, id, idDisp);
				return false;
			}
			else
			{
				settings.curvalue = stars.index(this) + 1;
				raterValue = jQuery(this).children('a')[0].href.split('#')[1];
			//	jQuery.post(container.url, { "rating": raterValue, "id": id }, function(response){
			//		container.children('.star-rating-result').html(response)	
			//	});
				
				ratingPOST(container.url, raterValue, id, idDisp);
				
				var stars2 = jQuery(container).find('.star-rating').children('.current-rating');
				stars2.width(raterwidthOne * raterValue).css("background-position","left bottom");
				
				for(var i = 1; i <= settings.maxvalue ; i++) 
				{
					var stars3 = jQuery(container).find('.star-rating').children('.star');
					stars3.empty();
				}
							
				return false;
			}
			return true;
		});
	}

	return this; // strict warning: anonymous function does not always return a value. fix?
}

function ratingError(id)
{
	var divObj = document.getElementById(id);
	if(divObj)
		divObj.innerHTML = "すでに評価しています。";
}

function ratingPOST(url, raterValue, id, idDisp)
{
	var query = 'rating='+raterValue+'&id='+id;
	var	xmlHttpReq = createHttpRequest2()
    xmlHttpReq.open("POST", url, false)
    xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded'); 
	xmlHttpReq.send(query);
	if(xmlHttpReq.status == 200)
	{
		var divObj = document.getElementById(idDisp);
		if(divObj)
		{
			if(1 == xmlHttpReq.responseText)
				divObj.innerHTML = "<p>" + "評価：" + raterValue + "<br>" + "ありがとうございました。" + "</p>";
			else
				divObj.innerHTML = "評価に失敗しました。";
		}
	}
	else
	{				
		var divObj = document.getElementById(idDisp);
		if(divObj)
			divObj.innerHTML = "評価に失敗しました。";
	}
}

function createHttpRequest2()
{
	var x = null;

    //IE7,Firefox, Safari
    if (window.XMLHttpRequest) {
        return new XMLHttpRequest();
    }

    //IE
	var progIDs = [
        "Msxml2.ServerXMLHTTP.6.0",
        "Msxml2.ServerXMLHTTP.5.0",
        "Msxml2.ServerXMLHTTP.4.0",
	    "Msxml2.ServerXMLHTTP.3.0",
	    "Msxml2.ServerXMLHTTP",
	    "Microsoft.ServerXMLHTTP",
	    "Msxml2.XMLHTTP.6.0",
	    "Msxml2.XMLHTTP.5.0",
	    "Msxml2.XMLHTTP.4.0",
	    "Msxml2.XMLHTTP.3.0",
	    "Msxml2.XMLHTTP",
	    "Microsoft.XMLHTTP" // カンマなし
	];
		
	var i;
	for (i = 0; i < progIDs.length; ++i)
	{
	    try
		{
	    	return new ActiveXObject(progIDs[i]);
	    }
		catch(e)
		{
	    	if (i == progIDs.length - 1)
	        	x = null;
	    }
	}

	return x;
}