using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Web;

namespace SiteCore.Handler
{
    public class GetDicData : BaseHandler, IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "application/jason";
            if (UrlParmsCheck("pType"))
            {
                string pType = GetString("pType").ToLower();
                string selId = GetString("selId");
                int pId = GetInt("pId");
                int cur = GetInt("cur");
                DataTable dt = null;
                switch (pType)
                {
                    case "industry":
                        {
                            dt = WebCache.GetCacheDicData(DicType.Industry, "", "industry_cache");
                            break;
                        }
                    case "trade":
                        {
                            dt = WebCache.GetCacheDicData(DicType.TradeType, "", "trade_cache");
                            break;
                        }
                    case "goodstype":
                        {
                            dt = WebCache.GetCacheDicData(DicType.GoodsType, "", "goodstype_cache");
                            break;
                        }
                    case "producttype":
                        {
                            int mId = GetInt("mId");
                            dt = WebCache.GetDicData(DicType.ProductType, "MerchantID=" + mId);
                            break;
                        }
                }
                if (dt == null) { returnErrorMsg("找不到数据,访问发生错误"); return; }
                IList<string> selIds = new List<string>();
                if (selId != "")//加载己选中的值
                {
                    DataRow[] tmpdrs = dt.Select("ID=" + selId);
                    if (tmpdrs != null && tmpdrs.Length > 0)
                    {
                        string path = tmpdrs[0]["Path"].ToString();
                        path = path.TrimStart('|') + selId;
                        selIds = path.Split('|');
                    }
                    else
                    {
                        selId = "";
                    }
                }
                DataView dv = new DataView(dt);
                if (dv.Count > 0)
                {
                    int idx = 0;
                    IList<string> resultList = new List<string>();
                    string tag = "";
                    //如果不是第二次触发&加载己有的值
                    //if (pId == 0 && selIds.Count > 0) pId = Convert.ToInt32(selIds[0]);
                    TreeBind(dt, pId, ref resultList, ref tag, selIds, idx);
                    //if (selIds.Count > 0) tag = string.Join(",", selIds.ToArray()) + "," + selId;
                    //sel-各级选中的ID,cur-当前选择的第几级触发事件 
                    returnSuccess("{" + string.Format("{0},\"sel\":\"{1}\",\"cur\":{2},\"selId\":\"{3}\"", string.Join(",", resultList.ToArray()), tag.TrimEnd(','), cur, selId) + "}");
                }
                return;
            }
            returnErrorMsg("数据读取出错");
        }

        private void TreeBind(DataTable dt, object parentId, ref IList<string> resultList, ref string tag, IList<string> selIds, int idx)
        {
            DataView dv = new DataView(dt);
            if (parentId.ToString() == "") return;
            dv.RowFilter = "ParentID=" + parentId;
            string tmp = string.Empty;
            if (dv.Count > 0)
            {
                if (selIds.Count > idx)
                {
                    tmp = selIds[idx];//下一次加载的ParentID
                    tag += selIds[idx] + ",";//当前默认选中
                    resultList.Add(string.Format("\"sel{0}\":[{1}]", selIds[idx], DvToJson(dv)));
                }
                else
                {
                    tmp = dv[0]["ID"].ToString();//下一次加载的ParentID
                    tag += tmp + ",";//当前默认选中
                    resultList.Add(string.Format("\"sel{0}\":[{1}]", tmp, DvToJson(dv)));
                }
                TreeBind(dt, tmp, ref resultList, ref tag, selIds, idx + 1);
            }
        }
        private string DvToJson(DataView dv)
        {
            StringBuilder json = new StringBuilder();
            foreach (DataRowView drv in dv)
            {
                json.Append("{");
                json.AppendFormat("\"name\":\"{0}\",\"value\":\"{1}\" ", drv["Name"], drv["ID"]);
                json.Append("},");
            }
            return json.ToString().TrimEnd(',');
        }
    }
}