/*
Copyright 2012, KISSY UI Library v1.31
MIT Licensed
build time: Dec 20 22:24
*/
/**
 * @ignore
 * @fileOverview cookie
 * @author lifesinger@gmail.com
 */
KISSY.add('cookie', function (S) {

    var doc = S.Env.host.document,
        MILLISECONDS_OF_DAY = 24 * 60 * 60 * 1000,
        encode = encodeURIComponent,
        decode = S.urlDecode;

    function isNotEmptyString(val) {
        return (typeof val == 'string') && val !== '';
    }

    /**
     * Provide Cookie utilities.
     * @class KISSY.Cookie
     * @singleton
     */
    return S.Cookie = {

        /**
         * Returns the cookie value for given name
         * @return {String} name The name of the cookie to retrieve
         */
        get: function (name) {
            var ret, m;

            if (isNotEmptyString(name)) {
                if ((m = String(doc.cookie).match(
                    new RegExp('(?:^| )' + name + '(?:(?:=([^;]*))|;|$)')))) {
                    ret = m[1] ? decode(m[1]) : '';
                }
            }
            return ret;
        },

        /**
         * Set a cookie with a given name and value
         * @param {String} name The name of the cookie to set
         * @param {String} val The value to set for cookie
         * @param {Number|Date} expires
         * if Number specified how many days this cookie will expire
         * @param {String} domain set cookie's domain
         * @param {String} path set cookie's path
         * @param {Boolean} secure whether this cookie can only be sent to server on https
         */
        set: function (name, val, expires, domain, path, secure) {
            var text = String(encode(val)), date = expires;

            // 从当前时间开始，多少天后过期
            if (typeof date === 'number') {
                date = new Date();
                date.setTime(date.getTime() + expires * MILLISECONDS_OF_DAY);
            }
            // expiration date
            if (date instanceof Date) {
                text += '; expires=' + date.toUTCString();
            }

            // domain
            if (isNotEmptyString(domain)) {
                text += '; domain=' + domain;
            }

            // path
            if (isNotEmptyString(path)) {
                text += '; path=' + path;
            }

            // secure
            if (secure) {
                text += '; secure';
            }

            doc.cookie = name + '=' + text;
        },

        /**
         * Remove a cookie from the machine by setting its expiration date to sometime in the past
         * @param {String} name The name of the cookie to remove.
         * @param {String} domain The cookie's domain
         * @param {String} path The cookie's path
         * @param {String} secure The cookie's secure option
         */
        remove: function (name, domain, path, secure) {
            this.set(name, '', -1, domain, path, secure);
        }
    };

});

/*
 2012.02.14 yiminghe@gmail.com
 - jsdoc added

 2010.04
 - get 方法要考虑 ie 下，
 值为空的 cookie 为 'test3; test3=3; test3tt=2; test1=t1test3; test3', 没有等于号。
 除了正则获取，还可以 split 字符串的方式来获取。
 - api 设计上，原本想借鉴 jQuery 的简明风格：S.cookie(name, ...), 但考虑到可扩展性，目前
 独立成静态工具类的方式更优。
 */
