using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;

namespace BO.Utils
{
  public class UrlUtil
  {
    public static string GetBarCode(string barCode)
    {
      //如果是链接
      //http://www.bwpsoft.com?code=WF20171108000003&name=

      if (barCode.Contains("?") && barCode.ToLower().Contains("http"))
      {
        barCode = barCode.Replace(ButcherAppContext.Context.UrlConfig.OutAddress + "?code=", "");
        var andIndex = barCode.IndexOf("&", StringComparison.Ordinal);
        barCode = barCode.Substring(0, andIndex);
      }
      return barCode.Trim();
    }

    public static string ParseCode(string url)
    {
      if (url.Contains("?"))
      {
        var arr = url.Split(new char[] { '?' }, StringSplitOptions.RemoveEmptyEntries);
        if (arr.Length > 1)
        {
          var list = arr[1].Split(new char[] { '&' }, StringSplitOptions.RemoveEmptyEntries);
          foreach (var item in list)
          {
            var l = item.Split(new char[] { '=' }, StringSplitOptions.RemoveEmptyEntries);
            if (l.Length == 2 && l[0].ToUpper() == "CODE")
              return l[1].Trim();

          }
          return string.Empty;
        }
        return string.Empty;
      }
      return url.Trim();
    }


    public static string GetGoodsName(string barCode)
    {
      //如果是链接

      if (barCode.Contains("name="))
      {
        var index = barCode.IndexOf("name=", StringComparison.Ordinal);

        barCode = barCode.Substring(index + 5);
        var name = barCode.Trim();
        if (name == "qpbt")
        {
          return "去皮白条";
        }
        if (name == "dpbt")
        {
          return "带皮白条";
        }
        return name;
      }
      return "";

    }

    public static string GetValueByKey(string key, string queryString)
    {
      var namevalue = GetQueryString(queryString);
      if (namevalue.AllKeys.ToList().Contains(key))
      {
        return namevalue[key];
      }
      return "";
    }

    private static NameValueCollection GetQueryString(string queryString)
    {
      return GetQueryString(queryString, Encoding.UTF8, true);
    }

    private static NameValueCollection GetQueryString(string queryString, Encoding encoding, bool isEncoded)
    {
      queryString = queryString.Replace("?", "");
      NameValueCollection result = new NameValueCollection(StringComparer.OrdinalIgnoreCase);
      if (!String.IsNullOrEmpty(queryString))
      {
        int count = queryString.Length;
        for (int i = 0; i < count; i++)
        {
          int startIndex = i;
          int index = -1;
          while (i < count)
          {
            char item = queryString[i];
            if (item == '=')
            {
              if (index < 0)
              {
                index = i;
              }
            }
            else if (item == '&')
            {
              break;
            }
            i++;
          }
          string key = null;
          string value = null;
          if (index >= 0)
          {
            key = queryString.Substring(startIndex, index - startIndex);
            value = queryString.Substring(index + 1, (i - index) - 1);
          }
          else
          {
            key = queryString.Substring(startIndex, i - startIndex);
          }
          if (isEncoded)
          {
            result[(string)MyUrlDeCode(key, encoding)] = MyUrlDeCode(value, encoding);
          }
          else
          {
            result[key] = value;
          }
          if ((i == (count - 1)) && (queryString[i] == '&'))
          {
            result[key] = String.Empty;
          }
        }
      }
      return result;
    }

    public static string UrlEncoding(string str)
    {
      string encode = HttpUtility.UrlEncode(str, Encoding.UTF8);
      return encode;
    }

    public static string MyUrlDeCode(string str, Encoding encoding)
    {
      if (encoding == null)
      {
        Encoding utf8 = Encoding.UTF8;
        //首先用utf-8进行解码                     
        string code = HttpUtility.UrlDecode(str.ToUpper(), utf8);
        //将已经解码的字符再次进行编码.
        string encode = HttpUtility.UrlEncode(code, utf8).ToUpper();
        if (str == encode)
          encoding = Encoding.UTF8;
        else
          encoding = Encoding.GetEncoding("gb2312");
      }
      return HttpUtility.UrlDecode(str, encoding);
    }
  }
}