// 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/
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 
	    cancel 		: true, //Set the default to having the cancel button
	    increment 	: 1, // value to increment by
	    maxvalue  	: 5,   // max number of stars
	    curvalue  	: 0    // number of selected stars
  	};
  	
	if(options) {
		jQuery.extend(settings, options);
	}
	
	if(options.cancel == null) {
		jQuery.extend(settings, {cancel: (settings.maxvalue > 1) ? true : false});
	}
   
	var container = jQuery(this);
	
	jQuery.extend(container, {
		averageRating: settings.curvalue,
		url: settings.url
	});
	
	if (settings.cancel == true)
		$(container).css("width",17+(17*settings.maxvalue));
	else
		$(container).css("width",17*settings.maxvalue);

	
	
	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.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(){
		settings.curvalue = (stars.index(this) * settings.increment) + settings.increment;
		jQuery.post(
			container.url, 
			{"rating": jQuery(this).children('a')[0].href.split('#')[1]},
			function(response){
				alert('a');
				if(settings.callback != null)
				{
					settings.callback(response);
				}
			},
			'json'
		);
		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] 
			});
			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);	

};