using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using Senparc.NeuChar.Context;
using Senparc.NeuChar.Entities;
using Senparc.Weixin.MP.Entities;
using Senparc.Weixin.MP.Entities.Request;
using Senparc.Weixin.MP.MessageHandlers;

namespace EMIS.Utility.OnlinePay.WeChat
{
    public class CustomMessageHandler : MessageHandler<CustomMessageContext>
    {
        public CustomMessageHandler(Stream inputStream, PostModel postModel)
            : base(inputStream, postModel)
        {

        }

        public override IResponseMessageBase DefaultResponseMessage(IRequestMessageBase requestMessage)
        {
            var responseMessage = base.CreateResponseMessage<ResponseMessageText>(); //ResponseMessageText也可以是News等其他类型
            responseMessage.Content = "";
            return responseMessage;
        }

        public override IResponseMessageBase OnEvent_SubscribeRequest(RequestMessageEvent_Subscribe requestMessage)
        {
            return base.OnEvent_SubscribeRequest(requestMessage);
        }

        public override IResponseMessageBase OnEvent_UnsubscribeRequest(RequestMessageEvent_Unsubscribe requestMessage)
        {
            return base.OnEvent_UnsubscribeRequest(requestMessage);
        }
    }

    public class CustomMessageContext : MessageContext<IRequestMessageBase, IResponseMessageBase>
    {
        public CustomMessageContext()
        {
            base.MessageContextRemoved += CustomMessageContext_MessageContextRemoved;
        }

        /// <summary>
        /// 当上下文过期，被移除时触发的时间
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void CustomMessageContext_MessageContextRemoved(object sender, Senparc.NeuChar.Context.WeixinContextRemovedEventArgs<IRequestMessageBase, IResponseMessageBase> e)
        {
            /* 注意，这个事件不是实时触发的（当然你也可以专门写一个线程监控）
             * 为了提高效率，根据WeixinContext中的算法，这里的过期消息会在过期后下一条请求执行之前被清除
             */
            var messageContext = e.MessageContext as CustomMessageContext;

            if (messageContext == null)
            {
                return;//如果是正常的调用，messageContext不会为null
            }

            //TODO:这里根据需要执行消息过期时候的逻辑，下面的代码仅供参考
            //Log.InfoFormat("{0}的消息上下文已过期",e.OpenId);
            //api.SendMessage(e.OpenId, "由于长时间未搭理客服，您的客服状态已退出！");
        }
    }
}