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

namespace JwKdsV.Core.MessageEvent
{
    /// <summary>
    /// 消息事件提供者
    /// </summary>
    public class MsgEventProvider
    {
        private string eventType = string.Empty;

        public List<MsgReceiver> Receivers;

        public MsgEventProvider(string _eventType)
        {
            eventType = _eventType;
            Receivers = new List<MsgReceiver>();
        }

        ~MsgEventProvider()
        {
            //Console.WriteLine(string.Format("{0}的MsgEventProvider析构函数执行！", eventType));
        }

        public string EventType
        {
            get { return eventType; }
        }

        private event EventHandler<MsgEventArgs> appEventHandler;

        public event EventHandler<MsgEventArgs> AppEventHandler
        {
            add
            {
                appEventHandler += value;
            }
            remove
            {
                appEventHandler -= value;
            }
        }

        #region 外部调用事件
        public void Run(Object sender , MsgEventArgs args)
        {
            if (appEventHandler != null)
            {
                appEventHandler(sender , args);
            }

            #region 去除那些只绑定一次处理事件的对象

            for (int i = 0; i < Receivers.Count; i++)
            {
                try
                {
                    MsgReceiver item = Receivers[i];

                    if (item == null) continue;

                    if (item.IsOnce)
                    {
                        AppEventHandler -= item.appEventHandler;
                        Receivers.Remove(item);
                    }
                }
                catch
                {
                    Console.WriteLine("去除接受者对象列表中内容错误！");
                }
            }


            #endregion

        }

        public void AddListener(MsgReceiver receiver)
        {
            Receivers.Add(receiver);
            AppEventHandler += receiver.appEventHandler;
        }

        public void RemoveListener(MsgReceiver receiver)
        {
            for (int i = 0; i < Receivers.Count; i++)
            {
                MsgReceiver item = Receivers[i];
                if (item.ReceiverObj == receiver.ReceiverObj)
                {
                    AppEventHandler -= item.appEventHandler;
                    Receivers.Remove(item);
                    return;
                }
            }
        }
        #endregion
    }
}