// 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)
Inspiration: Will Stuckey's star rating system (http://sandbox.wilstuckey.com/jquery-ratings/)
Half-Star Addition: Karl Swedberg
Demonstration: http://examples.learningjquery.com/rating/

New Version: 6 February, 2008
Additions by: Spencer Strickland
Demonstration: http://www.fourdown.org/code/jq_rating
Usage: $('#rating').rating('url-to-post.cfm', {maxvalue:5, curvalue:0, increment:1, onrating:function, oncancel:function});

arguments
url : required -- post changes to 
options
	increment : 1, // value to increment by
	maxvalue: number of stars
	curvalue: number of selected stars
	onrating: function to run after rating selected
	oncancel: function to run after rating canceled
************************************************/

jQuery.fn.rating = function(url, options) {
	
	if (url == null) 
		return;
	
	var settings = 	{
		url : url, // post changes to 
		onrating : null, // function call after rating
		oncancel : null, // function call after cancel
	  increment : 1, // value to increment by
	  maxvalue  : 5, // max number of stars
	  curvalue  : -1 // number of selected stars
  };
	
	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,
		onrating : settings.onrating,
		oncancel : settings.oncancel
  	}
	);

	settings.increment = (settings.increment < .75) ? .5 : 1;

	if (settings.maxvalue > 1 && settings.curvalue != -1)
		settings.curvalue = settings.curvalue + settings.increment;
		
	if (settings.maxvalue == 1 && settings.curvalue == -1)
		settings.curvalue = 0;

	var s = 0;

  if (settings.cancel == true) {
		var div = '<div class="cancel"><a href="#X" title="Cancel Rating">Cancel Rating</a></div>';
	  container.append (div);
	}
  
	for (var i= 0; i <= settings.maxvalue ; i++) {
  	if (i == 0) {
			if (settings.maxvalue > 1) {
	    	var div = '<div class="star zero"><a href="#0" title="Give it 0/'+settings.maxvalue+'">0</a></div>';
	      container.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.cancel == true) {
    	settings.curvalue = (stars.index(this) * settings.increment) + settings.increment;
      jQuery.post(container.url, {
      	"rating": jQuery(this).children('a')[0].href.split('#')[1]
				
	    }, 
			function(data) { 
				if (container.onrating) 
					container.onrating(data); 
			 	});
				return false;
		} else if (settings.maxvalue == 1) {
			settings.curvalue = (settings.curvalue == 0) ? 1 : 0;
			$(this).toggleClass('on');
			jQuery.post(container.url, {
				"rating": jQuery(this).children('a')[0].href.split('#')[1]
			}, 
			function(data) { 
				if (container.onrating) 
				container.onrating(data); 
			});
			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;
   	jQuery.post(container.url, {
	 		"rating": jQuery(this).children('a')[0].href.split('#')[1] 
  	}, 
		function(data) { 
			if (container.oncancel) 
			container.oncancel(data); 
		});
    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();
			if (index != 1)
				stars
				.filter('.zero').removeClass('on').removeClass('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.
				if (settings.curvalue != -1)
					if (settings.curvalue == settings.increment)
						stars.slice(0,settings.curvalue / settings.increment).addClass('on').end();
					else
						stars.slice(1,settings.curvalue / settings.increment).addClass('on').end();
			 		}
	 	};    
	
	event.reset();
	
	return (this);	

};