/**
 * 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
    readonly  : false, // rater for read only
    callback  : false  // function to call after success
	};
	
	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') {
		var raterwidth = settings.maxvalue * 25;
		var ratingparent = '<ul class="star-rating" style="width:'+raterwidth+'px">';
	}
	if(settings.style == 'small') {
		var raterwidth = settings.maxvalue * 13;
		var ratingparent = '<ul class="star-rating small-star" style="width:'+raterwidth+'px">';
	}
	if(settings.style == 'inline') {
		var raterwidth = settings.maxvalue * 13;
		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 (settings.readonly === false) {
        listitems+='<li class="star"><a href="#'+i+'" title="'+i+'/'+settings.maxvalue +'" style="width:'+starWidth+'%;z-index:'+starIndex+'">'+i+'</a></li>';
      } else {
        listitems+='<li class="star"><span class="star-value-readonly">'+i+'</span></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 (settings.readonly === false) {
    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 = jQuery(this).children('a')[0].href.split('#')[1];
        jQuery(container).find('.star-rating').children('.current-rating').css({width:((100/settings.maxvalue)*raterValue)+'%'});

        jQuery.ajax({
          url: container.url,
          //async: false,
          type: 'POST',
          data: { "rating": raterValue },

          beforeSend: function() {
            jQuery(container).find('.star-rating').hide();
            
            jQuery(container).find('.star-rating').before('<div class="star-rating-busy">&nbsp;</div>');
          },

          success: function(response) {
            container.children('.star-rating-result').html(response)

            // callback
            fn = eval(settings.callback);
            fn(response);
          },

          complete: function() {
            jQuery(container).find('.star-rating-busy').remove();

            jQuery(container).find('.star-rating').show();
          },

          error: function() {

          }

        });


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

        return false;
      }
      return true;
    });
  }

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