using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;


/* ***********************************************
 * subject  通用数据总线，采取订阅推送模式
 * author   张原川
 * date     2019/6/3 15:03:10 
 * ***********************************************/

namespace BPASmartClient.Bus.DataBus
{
    public class DataBus_Currency<TData> : ISimpleDataBus<TData>
    {
        //接收数据缓冲
        //protected CircularBuffer<TData> _dataPool = new CircularBuffer<TData>(1 * 1024 * 1024);
        protected ConcurrentQueue<TData> _dataPool = new ConcurrentQueue<TData>();
        //订阅数据回调集合
        protected List<Action<TData[]>> _multDataHandlers = new List<Action<TData[]>>();
        protected List<Action<TData>> _singleDataHandlers = new List<Action<TData>>();
        //订阅与推送数据信号量
        protected AutoResetEvent _are = new AutoResetEvent(false);
        //运行标识
        protected bool _running = false;

        public int MultSubscriberCount { get { return _multDataHandlers.Count; } }

        public int SingleSubscriberCount { get { return _singleDataHandlers.Count; } }

        public int DataCount { get { return _dataPool.Count; } }

        /// <summary>
        /// 终止事件总线
        /// </summary>
        public void Dispose()
        {
            StopBus();
        }

        /// <summary>
        /// 数据存入
        /// </summary>
        public void Put(TData data)
        {
            if (!_running)
                return;
            if (_multDataHandlers.Count > 0 || _singleDataHandlers.Count > 0)
                _dataPool.Enqueue(data);
        }

        /// <summary>
        /// 数据存入
        /// </summary>
        public void Put(TData[] data)
        {
            if (!_running)
                return;
            if (_multDataHandlers.Count > 0 || _singleDataHandlers.Count > 0)
                foreach (var item in data)
                    _dataPool.Enqueue(item);
        }

        /// <summary>
        /// 开启总线
        /// </summary>
        public void StartBus()
        {
            _running = true;
            List<TData> items = new List<TData>();
            _are.Set();
            while (_running)
            {
                int count = _dataPool.Count;
                items.Clear();
                if (_singleDataHandlers.Count > 0)
                {
                    _are.WaitOne(TimeSpan.FromMilliseconds(10));

                    for (int i = 0; i < count; i++)
                    {
                        TData data = default(TData);
                        
                        while (!_dataPool.TryDequeue(out data)) ;
                       
                        uint msgId = Convert.ToUInt32(data.GetType().GetProperty("msgid").GetValue(data));
                        if (msgId == 316)
                        {

                        }
                        //var item = _dataPool.Get();
                        //Parallel.ForEach(_singleDataHandlers, p => p.Invoke(items[items.Count - 1]));

                        for (int j = 0; j < _singleDataHandlers.Count; j++)
                        {
                            _singleDataHandlers[j].Invoke(data);
                        }
                        items.Add(data);
                    }
                }
                if (_multDataHandlers.Count > 0)
                {
                    if (items.Count <= 0)
                    {
                        TData data = default(TData);
                        for (int i = 0; i < count; i++)
                        {
                            while (!_dataPool.TryDequeue(out data)) ;
                            items.Add(data);
                        }
                        //items.AddRange(_dataPool.Get(count));
                    }
                    _are.WaitOne(TimeSpan.FromMilliseconds(10));
                    //Parallel.For(0, _multDataHandlers.Count, (i) =>
                    //{
                    //    _multDataHandlers[i].Invoke(items.ToArray());
                    //});
                    for (int i = _multDataHandlers.Count - 1; i >= 0; i--)
                    {
                        _multDataHandlers[i].Invoke(items.ToArray());
                    }
                }
                Thread.Sleep(10);
                _are.Set();
            }
        }

        public void StopBus()
        {
            _running = false;
        }

        /// <summary>
        /// 数据订阅
        /// </summary>
        /// <param name="action">接收数据回调</param>
        public void Subscribe(Action<TData> action)
        {
            if (_singleDataHandlers.Contains(action))
                return;
            _are.Reset();
            _singleDataHandlers.Add(action);
            _are.Set();
        }

        /// <summary>
        /// 数据订阅
        /// </summary>
        /// <param name="action">接收数据回调</param>
        public void Subscribe(Action<TData[]> action)
        {
            if (_multDataHandlers.Contains(action))
                return;
            _are.Reset();
            _multDataHandlers.Add(action);
            _are.Set();
        }

        /// <summary>
        /// 取消数据订阅
        /// </summary>
        /// <param name="action">接收数据回调</param>
        public void UnSubcribe(Action<TData> action)
        {
            if (!_singleDataHandlers.Contains(action))
                return;
            _are.Reset();
            _singleDataHandlers.Remove(action);
            _are.Set();
        }

        /// <summary>
        /// 取消数据订阅
        /// </summary>
        /// <param name="action">接收数据回调</param>
        public void UnSubcribe(Action<TData[]> action)
        {
            if (!_multDataHandlers.Contains(action))
                return;
            _are.Reset();
            _multDataHandlers.Remove(action);
            _are.Set();
        }
    }
}