define("portal/comment", ['utils', 'zepto', 'juicer'], function (_u) {
    var comment = {
        el: "#page-comment",
        formdata: {},
        isSend: false, // 区分点击的是cancel还是send
        sending: false,
        reset: function () {
            var $el = $(this.el);

            this.isSend = false;
            this.sending = false;
            this.formdata = {};
            $el.find(".star").addClass("active");
            $el.find("input").val("");
            $el.find("textarea").val("");
            $el.find(".send").removeClass("active");
        },
        bindEvent: function () {
            var $el = $(this.el);
            var that = this;
            var _goBack = function () {
                history.go(-1);
            };

            $el.on("click.cancel", '.cancel', _goBack).on("click.send", '.send', function () {
                var $send = $(this);
                var formdata = that.formdata;

                if (!$send.hasClass("active") || that.sending) return;

                formdata.content = that.utf16toEntities( $el.find("textarea").val() );
                that.sending = true; // 防止重复提交评论

                _u.ajax({
                    action: "saveComment",
                    data: formdata,
                    type: "post"
                }, function () {
                    that.isSend = true;
                    _goBack();
                });
            }).on("click.star", ".star", function () { // 评分
                var $star = $(this);
                var index = $star.index();

                that.formdata.score = index + 1;
                $star.addClass("active");
                $star.prevAll().addClass("active");
                $star.nextAll().removeClass("active");
                that.toggleSendBtn();
            });

            // 标题为必填
            $el.find("input").on("input", function () {
                var val = $(this).val();

                that.formdata.title = val;
                that.toggleSendBtn();
            });
        },
        /** 
         * 用于把用utf16编码的字符转换成实体字符，以供后台存储 
         * @param  {string} str 将要转换的字符串，其中含有utf16字符将被自动检出 
         * @return {string}     转换后的字符串，utf16字符将被转换成&#xxxx;形式的实体字符 
         */
        utf16toEntities: function (str) {
            var patt = /[\ud800-\udbff][\udc00-\udfff]/g; // 检测utf16字符正则  
            str = str.replace(patt, function (char) {
                var H, L, code;
                if (char.length === 2) {
                    H = char.charCodeAt(0); // 取出高位  
                    L = char.charCodeAt(1); // 取出低位  
                    code = (H - 0xD800) * 0x400 + 0x10000 + L - 0xDC00; // 转换算法  
                    return "&#" + code + ";";
                } else {
                    return char;
                }
            });
            return str;
        },
        toggleSendBtn: function () {
            var formdata = this.formdata;
            var isEnabled = formdata.title && formdata.score;

            $(this.el).find(".send").toggleClass("active", !!isEnabled);
        }
    };

    return {
        init: function () {
            comment.bindEvent();
        },
        reset: function (formdata) {
            comment.reset();
            comment.formdata = _u.strToJson(formdata, "&", "=");
            comment.formdata.score = 5;
        },
        isSend: function () {
            return comment.isSend;
        }
    };
});