/**
 * 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, options)
{
    if(url == null) return;
    var settings = {
        url       : url, // post changes to
        maxvalue  : 5,   // max number of stars
        curvalue  : 0,    // number of selected stars
        rated     : false, // was this thing rated already? if yes, don't allow another rating and show the other bg
        nofRatings: 0, // nof ratings
        rid: ""
    };
	
    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.rated) {
        jQuery("body").append("<style>.star-rating a:hover { background-position: none; }</style>");
    } else {
        jQuery("body").append("<style>.star-rating a:hover { background-position: left bottom; }</style>");
    }
    */
    if(!settings.style || settings.style == null || settings.style == 'basic') {
        var raterwidth = settings.maxvalue * 25;
        var ratingparent = '<ul class="star-rating" style="width:'+raterwidth+'px">';
    }
    if(settings.style == 'small') {
        var raterwidth = settings.maxvalue * 10;
        var ratingparent = '<ul class="star-rating small-star" style="width:'+raterwidth+'px">';
    }
    if(settings.style == 'inline') {
        var raterwidth = settings.maxvalue * 10;
        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) {
            var style = "";
            listitems+='<li id="currating-' + settings.rid + '" class="current-rating" style="' + style + 'width:'+curvalueWidth+'%;">'+settings.curvalue+'/'+settings.maxvalue+'</li>';
        } else {
            starWidth = Math.floor(100 / settings.maxvalue * i);
            starIndex = (settings.maxvalue - i) + 2;
            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()

    container.append('<span id="nofratingtext-' + settings.rid + '" class="nof-ratings-text"> (' + settings.nofRatings + ')</span>');
    if(settings.maxvalue > 1) // add a container for the ajax result
    {
        container.append('<span class="star-rating-result"></span>');
    }
    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)+'%'
            });
            jQuery.post(container.url, {
                "rating": settings.curvalue
            });
            return false;
        }
        else
        {
            //settings.curvalue = stars.index(this) + 1;
            raterValue = parseFloat(jQuery(this).children('a')[0].href.split('#')[1]);

            if (!settings.rated) {
                // calculate the new curvalue:
                if (settings.curvalue == 0) {
                    settings.curvalue = raterValue;
                } else {
                    settings.curvalue = (settings.curvalue + raterValue) / 2;
                }
                var curvalueWidth = Math.floor(100 / settings.maxvalue * settings.curvalue);
                document.getElementById("currating-" + settings.rid).style.width = curvalueWidth + '%';
                document.getElementById("nofratingtext-" + settings.rid).innerHTML = " (" + (settings.nofRatings + 1) + ")";
            }

            jQuery.post(container.url, {
                "rating": raterValue
            }, function(response){
                container.children('.star-rating-result').html(response)
            });

            settings.rated = true;
            return false;
        }
        return true;
    });
    
    return this; // strict warning: anonymous function does not always return a value. fix?
}