using System;
using System.Collections.Generic;
using System.Collections.Concurrent;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using QM.Exchange.Interface;
using QM.Exchange.Core.Services;

namespace QM.Exchange.Core
{
    /// <summary>
    /// 双工通讯服务
    /// </summary>
    public class DuplexMessageService : IDuplexMessageService
    {
        /// <summary>
        /// 客户端会话列表
        /// </summary>
        public static ConcurrentDictionary<string, ICallBackService> ClientList = new ConcurrentDictionary<string, ICallBackService>();//记录Sessionid

        #region 向服务端请求

        /// <summary>
        /// 向服务端请求
        /// </summary>
        /// <param name="message"></param>
        public void RequestServer(CommonMessage message)
        {
            try
            {
                OperationContext.Current.Channel.Closing += new EventHandler(Channel_Closing);

                string sessionID = OperationContext.Current.SessionId;

                if (ClientList.ContainsKey(sessionID) == false)
                {
                    //注册
                    this.Register(sessionID, message);
                }
                else
                {
                    //其他处理
                    MessageQueueService.Enqueue(message);
                }
            }
            catch (Exception e)
            {
                throw new FaultException(e.Message);
            }
        }

        #endregion

        #region 注册

        private void Register(string sessionID, CommonMessage message)
        {
            try
            {
                string clientHostName = OperationContext.Current.Channel.RemoteAddress.Uri.Host;

                ICallBackService client = OperationContext.Current.GetCallbackChannel<ICallBackService>();

                //添加会话信息
                ClientList.TryAdd(sessionID, client);

                Worker info = QMFrameWork.Common.Serialization.JsonConvertHelper.GetDeserialize<Worker>(message.Content);

                //向注册中心注册
                RegisterCenter.RegisterWorker(sessionID, clientHostName, info);
            }
            catch (Exception e)
            {
                throw new FaultException(e.Message);
            }
        }

        #endregion

        #region 客户端断开连接

        /// <summary>
        /// 客户端断开连接
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void Channel_Closing(object sender, EventArgs e)
        {
            List<string> sessionList = new List<string>();
            try
            {
                foreach (var d in ClientList)
                {
                    if (d.Value == (ICallBackService)sender)//删除此关闭的会话信息
                    {
                        ICallBackService outValue = null;
                        ClientList.TryRemove(d.Key, out outValue);
                        sessionList.Add(d.Key);
                        break;
                    }
                }
            }
            catch (Exception ex)
            {
                throw new FaultException(ex.Message);
            }
            finally
            {
                //注销工作节点
                RegisterCenter.LogoffWorker(sessionList);
            }
        }

        #endregion

        #region 获取客户端会话列表

        public ConcurrentDictionary<string, ICallBackService> GetClientList()
        {
            return ClientList;
        }

        #endregion

        #region 服务端向客户端发送信息(异步)

        /// <summary>
        /// 服务端向客户端发送信息(异步)
        /// </summary>
        /// <param name="Message"></param>
        public void SendMessageToClient(string sessionID, CommonMessage message)
        {
            try
            {

                ICallBackService client = null;

                bool r = ClientList.TryGetValue(sessionID, out client);

                if (r == true)
                {
                    client.SendMessageToClient(message);
                }
                else
                {
                    //客户端已离线
                    Console.WriteLine("sessionID:" + sessionID + "的客户端已下线");
                }
            }
            catch (Exception e)
            {
                throw new FaultException(e.Message);
            }
        }

        #endregion
    }
}