// 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 : .5, // value to increment by
		maxvalue  : 5,   // max number of stars
		curvalue  : 0,    // number of selected stars
		cancel : false,
		id : 0,
		oneShot: true,
		pre_callback : function() {},
		post_callback : function() {},
		ajax_callback : function() {}
	};

	var vote = function(val) {
		//var o = $(this[0]) // It's your element
		//alert(val);
		settings.curvalue=val;
		event.drain();
		event.vote();
	};

	
	if(options) {
		jQuery.extend(settings, options);
	};
	jQuery.extend(settings, {voted: false});
   
   
	var container = jQuery(this);
	
	jQuery.extend(container, {
		averageRating: settings.curvalue,
		url: settings.url
	});
	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.maxvalue == 1) {
			settings.curvalue = (settings.curvalue == 0) ? 1 : 0;
			settings.pre_callback.call(this,settings.curvalue);
			$(this).toggleClass('on');
			jQuery.post(container.url, {
			        "rating": jQuery(this).children('a')[0].href.split('#')[1] 
			});
			return false;
		} else if (!settings.voted || !settings.oneShot) {
			settings.curvalue = (stars.index(this) * settings.increment) + settings.increment;
			settings.pre_callback.call(this,settings.curvalue);
			jQuery.post(container.url, {
				"rating": jQuery(this).children('a')[0].href.split('#')[1],
				"id": settings.id
				},
				function(data) { settings.ajax_callback.call(this,data); }
			);
			event.drain();
			event.vote();
			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] 
			});
			return false;
		});
	}


	var event = {
		fill: function(el){ // fill to the current mouse position.
			if (!settings.voted || !settings.oneShot) {
				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.
			if (!settings.voted || !settings.oneShot) {
				stars
					.filter('.on').removeClass('on').end()
					.filter('.voted').removeClass('voted').end()
					.filter('.hover').removeClass('hover').end();
			}
		},
		reset: function(){ // Reset the stars to the default index.
			if (!settings.voted) {
				stars.slice(0,settings.curvalue / settings.increment).addClass('on').end();
			} else {
				stars.slice(0,settings.curvalue / settings.increment).addClass('voted').end();
			}
		},
		vote: function(){ // Reset the stars to the default index.
			if (!settings.voted || !settings.oneShot) {
				stars.slice(0,settings.curvalue / settings.increment).addClass('voted').end();
				settings.voted=true;
			}
		}
	};    
	event.reset();
	
	return(this);	

};