// 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 
    increment : .5, // value to increment by
    maxvalue  : 5,   // max number of stars
    curvalue  : 0,    // number of selected stars
    static : false	// if true, will not be changable
};
	
  	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
  	});
  
	settings.increment = (settings.increment < .75) ? .5 : 1;
	var s = 0;
	
	var hidden_input = '<input type="hidden" name="' + this.attr('class') + '" value=""/>';
    container.empty().append(hidden_input);
	
	for(var i= 0; i <= settings.maxvalue ; i++){
    if (i == 0) {
	    if(settings.cancel == true && settings.static == false){
        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>')
        .appendTo(container);
      if(settings.static == false)
      	$div.append('<a href="#'+i+'" title="Give it '+i+'/'+settings.maxvalue+'">'+i+'</a>');
      else
      	$div.append('<span></span>');

      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');
	var input = jQuery(container).children(':input');
	
	if(settings.static == false)
	{
	  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;
				$(input).val(settings.curvalue);
				//alert($(input).val());
				if(settings.url!=null){
					jQuery.post(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;
				$(input).val(settings.curvalue);
				$(this).toggleClass('on');
				if(settings.url!=null){
					jQuery.post(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;
		  $(input).val(settings.curvalue);
		  //alert($(input).val());
	      if(settings.url!=null){
			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);	

};