// JavaScript Document
/*************************************************
Star Rating System
First Version: 21 November, 2006
Second Version: 17 May, 2007
Author: Ritesh Agrawal (http://php.scripts.psu.edu/rja171/widgets/rating.php)
        email: ragrawal [at] gmail (dot) com
Inspiration: Will Stuckey's star rating system (http://sandbox.wilstuckey.com/jquery-ratings/)
Half-Star Addition: Karl Swedberg
Demonstration: http://examples.learningjquery.com/rating/
Usage: $('#rating').rating('url-to-post.php', {maxvalue:5, curvalue:0});

arguments
url : required -- post changes to 
options
  increment : 1, // value to increment by
	maxvalue: number of stars
	curvalue: number of selected stars
	

************************************************/

jQuery.fn.rating = function(url, options) {
	
	if(url == null) return;
	
	var settings = {
    url : url, // post changes to 
    increment : 1, // value to increment by
    maxvalue  : 5,   // max number of stars
    curvalue  : 0,    // number of selected stars
    cancel: true, // cancell button visible/not visible
    previous:true, // shows the previous selection
    callback:null, // callback function after a json call returns
    values:{}
  };
	
  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 + "?jsoncallback=?"
  });
  settings.increment = (settings.increment < .75) ? .5 : 1;
  var s = 0;
	for(var i= 0; i <= settings.maxvalue ; i++){
	if (i == 0) {
	    if(settings.cancel == true){
	    var div = '<div class="cancel"><a href="#0" title="Cancel Rating">Cancel Rating</a></div>';
	    container.empty().append(div);
	  }
	} else {
	  var $div = $('<div class="star"></div>')
	    .append('<a href="#'+i+'" title="Give it '+i+'/'+settings.maxvalue+'">'+i+'</a>')
	    .appendTo(container);
	  if (settings.increment == .5) {
	    if (s%2) {
	      $div.addClass('star-left');
	    } else {
	      $div.addClass('star-right');
	    }
	  }
	}
	i=i-1+settings.increment;
	s++;
  }
	
	var stars = jQuery(container).children('.star');
  var cancel = jQuery(container).children('.cancel');
	
  stars
    .mouseover(function(){
      event.drain();
      event.fill(this);
    })
    .mouseout(function(){
      event.drain();
      event.reset();
    })
    .focus(function(){
      event.drain();
      event.fill(this);
    })
    .blur(function(){
      event.drain();
      event.reset();
    });

  stars.click(function(){
  	if (settings.previous)
  	{
      settings.curvalue = (stars.index(this) * settings.increment) + settings.increment;
  	}
	var d = new Date();
	settings.values.rating = jQuery(this).children('a')[0].href.split('#')[1];
	settings.values.rnd = d.getTime();
	jQuery.getJSON(container.url, settings.values,callback);
	return false;
/*

		if(settings.cancel == true){
      settings.curvalue = (stars.index(this) * settings.increment) + settings.increment;
      jQuery.get(container.url, {
        "rating": jQuery(this).children('a')[0].href.split('#')[1] 
      
      });
			return false;
		} else if (settings.maxvalue == 1) {
			settings.curvalue = (settings.curvalue == 0) ? 1 : 0;
			$(this).toggleClass('on');
			jQuery.get(container.url, {
        "rating": jQuery(this).children('a')[0].href.split('#')[1] 
      });
			return false;
		}
		return true;
*/  	
  });

  // cancel button events
	if(cancel){
    cancel
    .mouseover(function(){
      event.drain();
      jQuery(this).addClass('on');
    })
    .mouseout(function(){
      event.reset();
      jQuery(this).removeClass('on');
    })
    .focus(function(){
      event.drain();
      jQuery(this).addClass('on');
    })
    .blur(function(){
      event.reset();
      jQuery(this).removeClass('on');
    });
      
    // click events.
    cancel.click(function(){
      event.drain();
      settings.curvalue = 0;
      var d = new Date();
      settings.values.rating = 0;
      settings.values.rnd = d.getTime();
      jQuery.getJSON(container.url,settings.values,callback);
      return false;
    });
  }
        
	var event = {
		fill: function(el){ // fill to the current mouse position.
			var index = stars.index(el) + 1;
			stars
				.children('a').css('width', '100%').end()
				.slice(0,index).addClass('hover').end();
		},
		drain: function() { // drain all the stars.
			stars
				.filter('.on').removeClass('on').end()
				.filter('.hover').removeClass('hover').end();
		},
		reset: function(){ // Reset the stars to the default index.
			stars.slice(0,settings.curvalue / settings.increment).addClass('on').end();
		}
	};    
	event.reset();

	return(this);	
};