using System;
using System.Collections.Generic;
using System.Xml;
using System.Text;

using CB.Cache;
using CB.Common;

namespace CB.Data.Synchronize
{
    /// <summary>
    /// 站外文章显示
    /// </summary>
    public class Article
    {
        /// <summary>
        /// 调用站外文章
        /// </summary>
        /// <param name="topSize">topSize</param>
        /// <param name="pageSize">pageSize</param>
        /// <param name="cid">文章分类</param>
        /// <param name="wap">是否WAP站</param>
        /// <returns></returns>
        public static IList<ArticleInfo> GetArticleList(int topSize, int pageSize, int cid, bool wap = false)
        {
            string key = string.Format("{0}-{1}-{2}", CacheKeys.SyncArticleList, pageSize, cid);
            var cache = CBCache.GetCacheService();
            IList<ArticleInfo> list = cache.GetObject(key) as IList<ArticleInfo>;
            if (null == list)
            {
                list = GetArticleList(pageSize, cid, wap);
                cache.AddObject(key, list);
            }
            if (null == list)
                return null;

            IList<ArticleInfo> r = new List<ArticleInfo>();
            int count = list.Count;
            count = topSize > count ? count : topSize;
            for (int i = 0; i < topSize; i++)
            {
                r.Add(list[i]);
            }
            return r;
        }

        private static IList<ArticleInfo> GetArticleList(int pageSize, int cid, bool wap)
        {
            if (string.IsNullOrEmpty(CB.Config.BaseConfigs.GetConfig().SynArticleUrl))
                return null;

            string userName = "55128";
            if (wap) userName = "55128wap";
            string passKey = "d3d3LjU1MTI4LmNu";
            string paras = Convert.ToBase64String(Encoding.UTF8.GetBytes(string.Format("topSize={0}|cid={1}",
                pageSize, cid)));

            string sign = Utils.MD5(passKey + userName + paras);

            string reqParas = string.Format("username={0}&paras={1}&sign={2}", userName, paras, sign);
            string str = Utils.GetHttpWebResponse(CB.Config.BaseConfigs.GetConfig().SynArticleUrl, reqParas);

            if (string.IsNullOrEmpty(str))
                return null;

            XmlDocument doc = new XmlDocument();
            try
            {
                doc.LoadXml(str);
            }
            catch { return null; }

            XmlNodeList nodeList = doc.GetElementsByTagName("data");
            if (null == nodeList || 0 == nodeList.Count)
                return null;

            IList<ArticleInfo> list = new List<ArticleInfo>();
            ArticleInfo entity = null;
            XmlNode n = null;
            foreach (XmlNode node in nodeList)
            {
                entity = new ArticleInfo();
                n = node.SelectSingleNode("title");
                if (null != n)
                    entity.Title = n.InnerText.Trim();

                n = node.SelectSingleNode("time");
                if (null != n)
                    entity.Time = TypeConverter.StrToDateTime(n.InnerText, DateTime.MinValue);

                n = node.SelectSingleNode("url");
                if (null != n)
                    entity.Url = n.InnerText.Trim();

                list.Add(entity);
            }
            return list;
        }

        /// <summary>
        /// 站外文章实体
        /// </summary>
        public class ArticleInfo
        {
            /// <summary>
            /// 标题
            /// </summary>
            public string Title { get; set; }
            /// <summary>
            /// 文章链接
            /// </summary>
            public string Url { get; set; }
            /// <summary>
            /// 文章时间
            /// </summary>
            public DateTime Time { get; set; }
        }
    }
}