#region Apache License Version 2.0
/*----------------------------------------------------------------

Copyright 2019 Jeffrey Su & Suzhou Senparc Network Technology Co.,Ltd.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the
License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
either express or implied. See the License for the specific language governing permissions
and limitations under the License.

Detail: https://github.com/JeffreySu/WeiXinMPSDK/blob/master/license.md

----------------------------------------------------------------*/
#endregion Apache License Version 2.0

/*----------------------------------------------------------------
    Copyright (C) 2019 Senparc
 
    文件名：RefundResponseHandler.cs
    文件功能描述：微信支付退款 响应处理
    
    
    创建标识：Senparc - 20150211
    
    修改标识：Senparc - 20150303
    修改描述：整理接口
    
    修改标识：Senparc - 20170623
    修改描述：使用 ASCII 字典排序
----------------------------------------------------------------*/

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Text;


using Senparc.CO2NET.Helpers;

#if NET45
using System.Web;
#else
using Microsoft.AspNetCore.Http;
#endif


namespace Senparc.Weixin.TenPay.V2
{
    /// <summary>
    /// ResponseHandler 的摘要说明。
    /// </summary>
    public class RefundResponseHandler
    {
        /// <summary>
        /// 密钥
        /// </summary>
        private string Key;

        /// <summary>
        /// 应答的参数
        /// </summary>
        protected Hashtable Parameters;

        /// <summary>
        /// debug信息
        /// </summary>
        private string DebugInfo;

        protected HttpContext HttpContext;

#if NET45
        /// <summary>
        /// 获取服务器通知数据方式，进行参数获取
        /// </summary>
        /// <param name="httpContext"></param>
        public RefundResponseHandler(HttpContext httpContext)
        {
            Parameters = new Hashtable();

            this.HttpContext = httpContext ?? HttpContext.Current;
            NameValueCollection collection;
            if (this.HttpContext.Request.HttpMethod == "POST")
            {
                collection = this.HttpContext.Request.Form;
            }
            else
            {
                collection = this.HttpContext.Request.QueryString;
            }

            foreach (string k in collection)
            {
                string v = (string)collection[k];
                this.SetParameter(k, v);
            }
        }
#endif

        /// <summary>
        /// 获取密钥
        /// </summary>
        /// <returns></returns>
        public string GetKey()
        { return Key; }

        /// <summary>
        /// 设置密钥
        /// </summary>
        /// <param name="key"></param>
        public void SetKey(string key)
        { this.Key = key; }

        /// <summary>
        /// 获取参数值
        /// </summary>
        /// <param name="parameter"></param>
        /// <returns></returns>
        public string GetParameter(string parameter)
        {
            string s = (string)Parameters[parameter];
            return (null == s) ? "" : s;
        }

        /// <summary>
        /// 设置参数值
        /// </summary>
        /// <param name="parameter"></param>
        /// <param name="parameterValue"></param>
        public void SetParameter(string parameter, string parameterValue)
        {
            if (parameter != null && parameter != "")
            {
                if (Parameters.Contains(parameter))
                {
                    Parameters.Remove(parameter);
                }

                Parameters.Add(parameter, parameterValue);
            }
        }

        /// <summary>
        /// 是否财付通签名,规则是:按参数名称a-z排序,遇到空值的参数不参加签名 @return boolean 
        /// </summary>
        /// <returns></returns>
        public virtual Boolean IsTenpaySign()
        {
            StringBuilder sb = new StringBuilder();

            ArrayList akeys = new ArrayList(Parameters.Keys);
            akeys.Sort(ASCIISort.Create());

            foreach (string k in akeys)
            {
                string v = (string)Parameters[k];
                if (null != v && "".CompareTo(v) != 0
                    && "sign".CompareTo(k) != 0 && "key".CompareTo(k) != 0)
                {
                    sb.Append(k + "=" + v + "&");
                }
            }

            sb.Append("key=" + this.GetKey());
            string sign = EncryptHelper.GetMD5(sb.ToString(), getCharset()).ToLower();

            //debug信息
            this.SetDebugInfo(sb.ToString() + " => sign:" + sign);
            return GetParameter("sign").ToLower().Equals(sign);
        }

#if NET45
        /// <summary>
        /// 显示处理结果。
        /// @param show_url 显示处</summary>
        /// @throws IOException 
        /// <param name="show_url"></param>
        public void DoShow(string show_url)
        {
            string strHtml = "<html><head>\r\n" +
                "<meta name=\"TENCENT_ONLINE_PAYMENT\" content=\"China TENCENT\">\r\n" +
                "<script language=\"javascript\">\r\n" +
                "window.location.href='" + show_url + "';\r\n" +
                "</script>\r\n" +
                "</head><body></body></html>";

            this.HttpContext.Response.Write(strHtml);

            this.HttpContext.Response.End();
        }
#endif
        /// <summary>
        /// 获取debug信息
        /// </summary>
        /// <returns></returns>
        public string GetDebugInfo()
        { return DebugInfo; }

        /// <summary>
        /// 设置debug信息
        /// </summary>
        /// <param name="debugInfo"></param>
        protected void SetDebugInfo(string debugInfo)
        { this.DebugInfo = debugInfo; }

        protected virtual string getCharset()
        {
#if NET45
            return this.HttpContext.Request.ContentEncoding.BodyName;
#else
            return Encoding.UTF8.WebName;
#endif
        }

        /// <summary>
        /// 是否财付通签名,规则是:按参数名称a-z排序,遇到空值的参数不参加签名 @return boolean
        /// </summary>
        /// <param name="aKeys"></param>
        /// <returns></returns>
        public virtual Boolean IsTenpaySign(ArrayList aKeys)
        {
            StringBuilder sb = new StringBuilder();

            foreach (string k in aKeys)
            {
                string v = (string)Parameters[k];
                if (null != v && "".CompareTo(v) != 0
                    && "sign".CompareTo(k) != 0 && "key".CompareTo(k) != 0)
                {
                    sb.Append(k + "=" + v + "&");
                }
            }

            sb.Append("key=" + this.GetKey());
            string sign = EncryptHelper.GetMD5(sb.ToString(), getCharset()).ToLower();

            //debug信息
            this.SetDebugInfo(sb.ToString() + " => sign:" + sign);
            return GetParameter("sign").ToLower().Equals(sign);
        }
    }
}
