jQuery.fn.rater = function(options) {

    // 默认参数
    var settings = {
        enabled : true,
        url     : '',
        method  : 'post',
        min     : 1,
        max     : 3,
        step    : 1,
        value   : null,
        after_click : null,
        before_ajax : null,
        after_ajax  : null,
        title_format    : null,
        image   : '/common/js/rater/star.gif',
        width   : 25,
        height  : 25
    };

    // 自定义参数
    if(options) {
        jQuery.extend(settings, options);
    }

    // 主容器
    var content = jQuery('<ul class="rater-star"></ul>');
    content.css('background-image' , 'url(' + settings.image + ')');
    content.css('height' , settings.height);
    content.css('width' , (settings.width*settings.step) * (settings.max-settings.min+settings.step)/settings.step);

    // 当前选中的
    var item    = jQuery('<li class="rater-star-item-current"></li>');
    item.css('background-image' , 'url(' + settings.image + ')');
    item.css('height' , settings.height);
    item.css('width' , 0);
    item.css('z-index' , settings.max / settings.step + 1);
    if (settings.value) {
        item.css('width' , ((settings.value-settings.min)/settings.step+1)*settings.step*settings.width);
    }

    content.append(item);

    // 星星
    for (var value=settings.min ; value<=settings.max ; value+=settings.step) {
        item    = jQuery('<li class="rater-star-item"></li>');

        if (typeof settings.title_format == 'function') {
            item.attr('title' , settings.title_format(value));
        }
        else {
            item.attr('title' , value);
        }
        item.css('height' , settings.height);
        item.css('width' , (value-settings.min+settings.step)*settings.width);
        item.css('z-index' , (settings.max - value) / settings.step + 1);
        item.css('background-image' , 'url(' + settings.image + ')');

        if (!settings.enabled) {    // 若是不能更改，则隐藏
            item.hide();
        }

        content.append(item);
    }

    content.mouseover(function(){
        if (settings.enabled) {
            jQuery(this).find('.rater-star-item-current').hide();
        }
    }).mouseout(function(){
            jQuery(this).find('.rater-star-item-current').show();
    })

    // 添加鼠标悬停/点击事件
    content.find('.rater-star-item').mouseover(function() {
        jQuery(this).attr('class' , 'rater-star-item-hover');
    }).mouseout(function() {
        jQuery(this).attr('class' , 'rater-star-item');
    }).click(function() {
        jQuery(this).prevAll('.rater-star-item-current').css('width' , jQuery(this).width());

        var star_count      = (settings.max - settings.min) + settings.step;
        var current_number  = jQuery(this).prevAll('.rater-star-item').size()+1;
        var current_value   = settings.min + (current_number - 1) * settings.step;
        var data    = {
            value   : current_value,
            number  : current_number,
            count   : star_count,
            min     : settings.min,
            max     : settings.max
        }

        // 处理回调事件
        if (typeof settings.after_click == 'function') {
            settings.after_click(data);
        }

        // 处理ajax调用
        if (settings.url) {

            jQuery.ajax({
                data        : data,
                type        : settings.method,
                url         : settings.url,
                beforeSend  : function() {
                    if (typeof settings.before_ajax == 'function') {
                        settings.before_ajax(data);
                    }
                },
                success     : function(ret) {
                    if (typeof settings.after_ajax == 'function') {
                        data.ajax   = ret;
                        settings.after_ajax(data);
                    }
                }
            });

        }
    })

    jQuery(this).html(content);

}