/**
 * 好评数插件
 * @author 杨阳
 */
(function ($) {
    $.fn.extend({
        star: function (options) {
            if (!this.length) {
                if (options && options.debug && window.console) {
                    console.warn("必须指定一个可用元素");
                }
                return;
            }
            var star = $.data(this[0], "star");
            if (star) {
                if ($.isPlainObject(star.methods)) {
                    if (star.methods.hasOwnProperty(options)) {
                        return star.methods[options].call(this);
                    }
                }
                return star;
            }

            var opts = $.extend(defaults, options);

            var path = filePath();
            var cssUrl = path + "theme/" + opts.theme + "/css/star.css";
            if ($("link[href*='" + cssUrl + "']").length == 0) {
                dynamicLoadCss(cssUrl);
            }

            var $ul = $("<ul class='star-list'></ul>");
            $ul.height(opts.height);

            var score = opts.score * opts.count; // 实际分数
            var count = parseInt(score);
            for (var i = 0; i < opts.count; i++) {
                var $li = $("<li class='star'></li>");
                $li.width(opts.width).height(opts.width);
                if (score) {
                    if (i < count) {
                        $li.addClass("all");
                    } else if (i == count && score - count > 0) {
                        $li.addClass("half");
                    }
                }
                $ul.append($li);
            }

            $(this).empty().append($ul).append("<div class='score'><span>0</span>分</div>");

            if (!opts.view) {
                $ul.find("li").click(function () {
                    var index = $(this).index();
                    $ul.find("li").removeClass("all").removeClass("half");
                    for (var i = 0; i <= index; i++) {
                        $ul.find("li").eq(i).addClass("all");
                    }
                    $ul.next().addClass("active").find("span").attr("data-index", index + 1).html(index + 1);
                    if ($.isFunction(opts.click)) {
                        opts.click(index + 1, $ul.find("li").length);
                    }
                });
                $ul.find("li").hover(function () {
                    var index = $(this).index();
                    $ul.find("li").removeClass("all").removeClass("half");
                    for (var i = 0; i <= index; i++) {
                        $ul.find("li").eq(i).addClass("all");
                    }
                    $ul.next().find("span").html(index + 1);
                });
                $ul.mouseout(function () {
                    if ($ul.next(".active").length) {
                        var index = parseInt($ul.next(".active").find("span").attr("data-index"));
                        $ul.find("li").removeClass("all").removeClass("half");
                        for (var i = 0; i < index; i++) {
                            $ul.find("li").eq(i).addClass("all");
                        }
                        $ul.next(".active").find("span").html(index);
                    } else {
                        $ul.find("li").removeClass("all").removeClass("half");
                        $ul.next().find("span").html(0);
                    }
                });
            }

            this.methods = {
                count: function () {
                    return $.fn.star.count(this);
                },
                score: function () {
                    return $.fn.star.score(this);
                }
            };

            $.data(this[0], "star", this);
            return this;
        }
    });

    var defaults = {
        theme: 'default',
        count: 5,
        score: 0,
        width: 15,
        height: 15,
        click: function (selected, count) {

        },
        view: false,
    };

    /**
     * 动态加载CSS
     * @param {string} url 样式地址
     */
    function dynamicLoadCss(url) {
        var $link = $("<link type='text/css' rel='stylesheet'/>");
        $link.attr("href", url);
        $("head").append($link);
    }

    /**
     * 当前插件所在目录
     */
    function filePath() {
        return $("script[src*='jquery-star.js']").attr("src").replace("jquery-star.js", "");
    }

    $.fn.star.count = function (obj) {
        var $ul = $(obj).find("ul.star-list");
        return $ul.find("li.star.all").length;
    };

    $.fn.star.score = function (obj) {
        var $ul = $(obj).find("ul.star-list");
        var count = $ul.find("li.star").length;
        var selected = $ul.find("li.star.all").length;
        var score = selected / count;
        return Math.round(score * 100, 2) / 100;
    };

})(window.jQuery);