// 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
    };

    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;
    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.cancel == true){
            settings.curvalue = (stars.index(this) * settings.increment) + settings.increment;
            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;
            $(this).toggleClass('on');
            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;
            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);

};